1734 lines
64 KiB
Java
1734 lines
64 KiB
Java
/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.commons.lang3;
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import java.lang.reflect.Method;
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import java.lang.reflect.Modifier;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.Comparator;
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import java.util.HashMap;
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import java.util.HashSet;
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import java.util.Iterator;
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import java.util.LinkedHashSet;
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import java.util.List;
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import java.util.Map;
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import java.util.Objects;
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import java.util.Set;
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import java.util.stream.Collectors;
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import org.apache.commons.lang3.mutable.MutableObject;
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/**
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* <p>
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* Operates on classes without using reflection.
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* </p>
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*
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* <p>
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* This class handles invalid {@code null} inputs as best it can. Each method documents its behavior in more detail.
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* </p>
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*
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* <p>
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* The notion of a {@code canonical name} includes the human readable name for the type, for example {@code int[]}. The
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* non-canonical method variants work with the JVM names, such as {@code [I}.
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* </p>
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*
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* @since 2.0
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*/
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public class ClassUtils {
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/**
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* Inclusivity literals for {@link #hierarchy(Class, Interfaces)}.
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*
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* @since 3.2
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*/
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public enum Interfaces {
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/** Includes interfaces. */
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INCLUDE,
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/** Excludes interfaces. */
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EXCLUDE
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}
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private static final Comparator<Class<?>> COMPARATOR = (o1, o2) -> Objects.compare(getName(o1), getName(o2), String::compareTo);
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/**
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* The package separator character: {@code '.' == {@value}}.
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*/
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public static final char PACKAGE_SEPARATOR_CHAR = '.';
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/**
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* The package separator String: {@code "."}.
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*/
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public static final String PACKAGE_SEPARATOR = String.valueOf(PACKAGE_SEPARATOR_CHAR);
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/**
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* The inner class separator character: {@code '$' == {@value}}.
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*/
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public static final char INNER_CLASS_SEPARATOR_CHAR = '$';
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/**
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* The inner class separator String: {@code "$"}.
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*/
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public static final String INNER_CLASS_SEPARATOR = String.valueOf(INNER_CLASS_SEPARATOR_CHAR);
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/**
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* Maps names of primitives to their corresponding primitive {@link Class}es.
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*/
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private static final Map<String, Class<?>> namePrimitiveMap = new HashMap<>();
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static {
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namePrimitiveMap.put("boolean", Boolean.TYPE);
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namePrimitiveMap.put("byte", Byte.TYPE);
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namePrimitiveMap.put("char", Character.TYPE);
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namePrimitiveMap.put("short", Short.TYPE);
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namePrimitiveMap.put("int", Integer.TYPE);
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namePrimitiveMap.put("long", Long.TYPE);
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namePrimitiveMap.put("double", Double.TYPE);
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namePrimitiveMap.put("float", Float.TYPE);
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namePrimitiveMap.put("void", Void.TYPE);
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}
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/**
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* Maps primitive {@link Class}es to their corresponding wrapper {@link Class}.
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*/
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private static final Map<Class<?>, Class<?>> primitiveWrapperMap = new HashMap<>();
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static {
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primitiveWrapperMap.put(Boolean.TYPE, Boolean.class);
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primitiveWrapperMap.put(Byte.TYPE, Byte.class);
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primitiveWrapperMap.put(Character.TYPE, Character.class);
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primitiveWrapperMap.put(Short.TYPE, Short.class);
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primitiveWrapperMap.put(Integer.TYPE, Integer.class);
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primitiveWrapperMap.put(Long.TYPE, Long.class);
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primitiveWrapperMap.put(Double.TYPE, Double.class);
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primitiveWrapperMap.put(Float.TYPE, Float.class);
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primitiveWrapperMap.put(Void.TYPE, Void.TYPE);
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}
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/**
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* Maps wrapper {@link Class}es to their corresponding primitive types.
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*/
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private static final Map<Class<?>, Class<?>> wrapperPrimitiveMap = new HashMap<>();
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static {
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for (final Map.Entry<Class<?>, Class<?>> entry : primitiveWrapperMap.entrySet()) {
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final Class<?> primitiveClass = entry.getKey();
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final Class<?> wrapperClass = entry.getValue();
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if (!primitiveClass.equals(wrapperClass)) {
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wrapperPrimitiveMap.put(wrapperClass, primitiveClass);
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}
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}
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}
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/**
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* Maps a primitive class name to its corresponding abbreviation used in array class names.
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*/
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private static final Map<String, String> abbreviationMap;
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/**
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* Maps an abbreviation used in array class names to corresponding primitive class name.
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*/
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private static final Map<String, String> reverseAbbreviationMap;
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/** Feed abbreviation maps. */
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static {
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final Map<String, String> m = new HashMap<>();
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m.put("int", "I");
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m.put("boolean", "Z");
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m.put("float", "F");
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m.put("long", "J");
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m.put("short", "S");
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m.put("byte", "B");
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m.put("double", "D");
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m.put("char", "C");
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final Map<String, String> r = new HashMap<>();
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for (final Map.Entry<String, String> e : m.entrySet()) {
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r.put(e.getValue(), e.getKey());
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}
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abbreviationMap = Collections.unmodifiableMap(m);
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reverseAbbreviationMap = Collections.unmodifiableMap(r);
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}
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/**
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* Gets the class comparator, comparing by class name.
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*
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* @return the class comparator.
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* @since 3.13.0
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*/
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public static Comparator<Class<?>> comparator() {
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return COMPARATOR;
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}
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/**
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* <p>
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* Given a {@link List} of {@link Class} objects, this method converts them into class names.
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* </p>
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*
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* <p>
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* A new {@link List} is returned. {@code null} objects will be copied into the returned list as {@code null}.
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* </p>
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*
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* @param classes the classes to change
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* @return a {@link List} of class names corresponding to the Class objects, {@code null} if null input
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* @throws ClassCastException if {@code classes} contains a non-{@link Class} entry
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*/
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public static List<String> convertClassesToClassNames(final List<Class<?>> classes) {
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return classes == null ? null : classes.stream().map(e -> getName(e, null)).collect(Collectors.toList());
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}
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/**
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* <p>
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* Given a {@link List} of class names, this method converts them into classes.
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* </p>
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*
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* <p>
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* A new {@link List} is returned. If the class name cannot be found, {@code null} is stored in the {@link List}. If the
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* class name in the {@link List} is {@code null}, {@code null} is stored in the output {@link List}.
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* </p>
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*
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* @param classNames the classNames to change
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* @return a {@link List} of Class objects corresponding to the class names, {@code null} if null input
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* @throws ClassCastException if classNames contains a non String entry
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*/
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public static List<Class<?>> convertClassNamesToClasses(final List<String> classNames) {
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if (classNames == null) {
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return null;
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}
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final List<Class<?>> classes = new ArrayList<>(classNames.size());
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for (final String className : classNames) {
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try {
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classes.add(Class.forName(className));
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} catch (final Exception ex) {
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classes.add(null);
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}
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}
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return classes;
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}
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/**
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* <p>
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* Gets the abbreviated name of a {@link Class}.
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* </p>
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*
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* @param cls the class to get the abbreviated name for, may be {@code null}
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* @param lengthHint the desired length of the abbreviated name
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* @return the abbreviated name or an empty string
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* @throws IllegalArgumentException if len <= 0
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* @see #getAbbreviatedName(String, int)
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* @since 3.4
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*/
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public static String getAbbreviatedName(final Class<?> cls, final int lengthHint) {
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if (cls == null) {
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return StringUtils.EMPTY;
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}
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return getAbbreviatedName(cls.getName(), lengthHint);
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}
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/**
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* <p>
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* Gets the abbreviated class name from a {@link String}.
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* </p>
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*
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* <p>
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* The string passed in is assumed to be a class name - it is not checked.
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* </p>
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*
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* <p>
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* The abbreviation algorithm will shorten the class name, usually without significant loss of meaning.
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* </p>
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*
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* <p>
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* The abbreviated class name will always include the complete package hierarchy. If enough space is available,
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* rightmost sub-packages will be displayed in full length. The abbreviated package names will be shortened to a single
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* character.
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* </p>
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* <p>
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* Only package names are shortened, the class simple name remains untouched. (See examples.)
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* </p>
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* <p>
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* The result will be longer than the desired length only if all the package names shortened to a single character plus
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* the class simple name with the separating dots together are longer than the desired length. In other words, when the
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* class name cannot be shortened to the desired length.
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* </p>
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* <p>
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* If the class name can be shortened then the final length will be at most {@code lengthHint} characters.
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* </p>
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* <p>
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* If the {@code lengthHint} is zero or negative then the method throws exception. If you want to achieve the shortest
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* possible version then use {@code 1} as a {@code lengthHint}.
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* </p>
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*
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* <table>
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* <caption>Examples</caption>
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* <tr>
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* <td>className</td>
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* <td>len</td>
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* <td>return</td>
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* </tr>
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* <tr>
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* <td>null</td>
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* <td>1</td>
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* <td>""</td>
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* </tr>
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* <tr>
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* <td>"java.lang.String"</td>
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* <td>5</td>
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* <td>"j.l.String"</td>
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* </tr>
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* <tr>
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* <td>"java.lang.String"</td>
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* <td>15</td>
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* <td>"j.lang.String"</td>
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* </tr>
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* <tr>
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* <td>"java.lang.String"</td>
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* <td>30</td>
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* <td>"java.lang.String"</td>
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* </tr>
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* <tr>
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* <td>"org.apache.commons.lang3.ClassUtils"</td>
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* <td>18</td>
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* <td>"o.a.c.l.ClassUtils"</td>
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* </tr>
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* </table>
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*
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* @param className the className to get the abbreviated name for, may be {@code null}
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* @param lengthHint the desired length of the abbreviated name
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* @return the abbreviated name or an empty string if the specified class name is {@code null} or empty string. The
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* abbreviated name may be longer than the desired length if it cannot be abbreviated to the desired length.
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* @throws IllegalArgumentException if {@code len <= 0}
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* @since 3.4
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*/
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public static String getAbbreviatedName(final String className, final int lengthHint) {
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if (lengthHint <= 0) {
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throw new IllegalArgumentException("len must be > 0");
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}
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if (className == null) {
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return StringUtils.EMPTY;
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}
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if (className.length() <= lengthHint) {
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return className;
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}
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final char[] abbreviated = className.toCharArray();
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int target = 0;
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int source = 0;
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while (source < abbreviated.length) {
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// copy the next part
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int runAheadTarget = target;
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while (source < abbreviated.length && abbreviated[source] != '.') {
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abbreviated[runAheadTarget++] = abbreviated[source++];
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}
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++target;
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if (useFull(runAheadTarget, source, abbreviated.length, lengthHint) || target > runAheadTarget) {
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target = runAheadTarget;
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}
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// copy the '.' unless it was the last part
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if (source < abbreviated.length) {
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abbreviated[target++] = abbreviated[source++];
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}
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}
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return new String(abbreviated, 0, target);
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}
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/**
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* <p>
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* Gets a {@link List} of all interfaces implemented by the given class and its superclasses.
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* </p>
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*
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* <p>
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* The order is determined by looking through each interface in turn as declared in the source file and following its
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* hierarchy up. Then each superclass is considered in the same way. Later duplicates are ignored, so the order is
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* maintained.
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* </p>
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*
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* @param cls the class to look up, may be {@code null}
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* @return the {@link List} of interfaces in order, {@code null} if null input
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*/
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public static List<Class<?>> getAllInterfaces(final Class<?> cls) {
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if (cls == null) {
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return null;
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}
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final LinkedHashSet<Class<?>> interfacesFound = new LinkedHashSet<>();
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getAllInterfaces(cls, interfacesFound);
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return new ArrayList<>(interfacesFound);
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}
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/**
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* Gets the interfaces for the specified class.
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*
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* @param cls the class to look up, may be {@code null}
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* @param interfacesFound the {@link Set} of interfaces for the class
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*/
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private static void getAllInterfaces(Class<?> cls, final HashSet<Class<?>> interfacesFound) {
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while (cls != null) {
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final Class<?>[] interfaces = cls.getInterfaces();
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for (final Class<?> i : interfaces) {
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if (interfacesFound.add(i)) {
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getAllInterfaces(i, interfacesFound);
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}
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}
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cls = cls.getSuperclass();
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}
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}
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/**
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* <p>
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* Gets a {@link List} of superclasses for the given class.
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* </p>
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*
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* @param cls the class to look up, may be {@code null}
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* @return the {@link List} of superclasses in order going up from this one {@code null} if null input
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*/
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public static List<Class<?>> getAllSuperclasses(final Class<?> cls) {
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if (cls == null) {
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return null;
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}
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final List<Class<?>> classes = new ArrayList<>();
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Class<?> superclass = cls.getSuperclass();
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while (superclass != null) {
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classes.add(superclass);
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superclass = superclass.getSuperclass();
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}
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return classes;
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}
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/**
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* <p>
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* Gets the canonical class name for a {@link Class}.
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* </p>
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*
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* @param cls the class for which to get the canonical class name; may be null
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* @return the canonical name of the class, or the empty String
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* @since 3.7
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* @see Class#getCanonicalName()
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*/
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public static String getCanonicalName(final Class<?> cls) {
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return getCanonicalName(cls, StringUtils.EMPTY);
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}
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/**
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* <p>
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* Gets the canonical name for a {@link Class}.
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* </p>
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*
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* @param cls the class for which to get the canonical class name; may be null
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* @param valueIfNull the return value if null
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* @return the canonical name of the class, or {@code valueIfNull}
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* @since 3.7
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* @see Class#getCanonicalName()
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*/
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public static String getCanonicalName(final Class<?> cls, final String valueIfNull) {
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if (cls == null) {
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return valueIfNull;
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}
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final String canonicalName = cls.getCanonicalName();
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return canonicalName == null ? valueIfNull : canonicalName;
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}
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/**
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* <p>
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* Gets the canonical name for an {@link Object}.
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* </p>
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*
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* @param object the object for which to get the canonical class name; may be null
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* @return the canonical name of the object, or the empty String
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* @since 3.7
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* @see Class#getCanonicalName()
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*/
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public static String getCanonicalName(final Object object) {
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return getCanonicalName(object, StringUtils.EMPTY);
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}
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/**
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* <p>
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* Gets the canonical name for an {@link Object}.
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* </p>
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*
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* @param object the object for which to get the canonical class name; may be null
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* @param valueIfNull the return value if null
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* @return the canonical name of the object or {@code valueIfNull}
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* @since 3.7
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* @see Class#getCanonicalName()
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*/
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public static String getCanonicalName(final Object object, final String valueIfNull) {
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if (object == null) {
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return valueIfNull;
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}
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final String canonicalName = object.getClass().getCanonicalName();
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return canonicalName == null ? valueIfNull : canonicalName;
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}
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/**
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* <p>
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* Converts a given name of class into canonical format. If name of class is not a name of array class it returns
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* unchanged name.
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* </p>
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*
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* <p>
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* The method does not change the {@code $} separators in case the class is inner class.
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* </p>
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*
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* <p>
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* Example:
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* <ul>
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* <li>{@code getCanonicalName("[I") = "int[]"}</li>
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* <li>{@code getCanonicalName("[Ljava.lang.String;") = "java.lang.String[]"}</li>
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* <li>{@code getCanonicalName("java.lang.String") = "java.lang.String"}</li>
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* </ul>
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* </p>
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*
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* @param className the name of class
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* @return canonical form of class name
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* @since 2.4
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*/
|
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private static String getCanonicalName(String className) {
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className = StringUtils.deleteWhitespace(className);
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if (className == null) {
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return null;
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}
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int dim = 0;
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while (className.startsWith("[")) {
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dim++;
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className = className.substring(1);
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}
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if (dim < 1) {
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return className;
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}
|
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if (className.startsWith("L")) {
|
|
className = className.substring(1, className.endsWith(";") ? className.length() - 1 : className.length());
|
|
} else if (!className.isEmpty()) {
|
|
className = reverseAbbreviationMap.get(className.substring(0, 1));
|
|
}
|
|
final StringBuilder canonicalClassNameBuffer = new StringBuilder(className);
|
|
for (int i = 0; i < dim; i++) {
|
|
canonicalClassNameBuffer.append("[]");
|
|
}
|
|
return canonicalClassNameBuffer.toString();
|
|
}
|
|
|
|
/**
|
|
* Returns the (initialized) class represented by {@code className} using the {@code classLoader}. This implementation
|
|
* supports the syntaxes "{@code java.util.Map.Entry[]}", "{@code java.util.Map$Entry[]}",
|
|
* "{@code [Ljava.util.Map.Entry;}", and "{@code [Ljava.util.Map$Entry;}".
|
|
*
|
|
* @param classLoader the class loader to use to load the class
|
|
* @param className the class name
|
|
* @return the class represented by {@code className} using the {@code classLoader}
|
|
* @throws NullPointerException if the className is null
|
|
* @throws ClassNotFoundException if the class is not found
|
|
*/
|
|
public static Class<?> getClass(final ClassLoader classLoader, final String className) throws ClassNotFoundException {
|
|
return getClass(classLoader, className, true);
|
|
}
|
|
|
|
/**
|
|
* Returns the class represented by {@code className} using the {@code classLoader}. This implementation supports the
|
|
* syntaxes "{@code java.util.Map.Entry[]}", "{@code java.util.Map$Entry[]}", "{@code [Ljava.util.Map.Entry;}", and
|
|
* "{@code [Ljava.util.Map$Entry;}".
|
|
*
|
|
* @param classLoader the class loader to use to load the class
|
|
* @param className the class name
|
|
* @param initialize whether the class must be initialized
|
|
* @return the class represented by {@code className} using the {@code classLoader}
|
|
* @throws NullPointerException if the className is null
|
|
* @throws ClassNotFoundException if the class is not found
|
|
*/
|
|
public static Class<?> getClass(final ClassLoader classLoader, final String className, final boolean initialize) throws ClassNotFoundException {
|
|
try {
|
|
final Class<?> clazz;
|
|
if (namePrimitiveMap.containsKey(className)) {
|
|
clazz = namePrimitiveMap.get(className);
|
|
} else {
|
|
clazz = Class.forName(toCanonicalName(className), initialize, classLoader);
|
|
}
|
|
return clazz;
|
|
} catch (final ClassNotFoundException ex) {
|
|
// allow path separators (.) as inner class name separators
|
|
final int lastDotIndex = className.lastIndexOf(PACKAGE_SEPARATOR_CHAR);
|
|
|
|
if (lastDotIndex != -1) {
|
|
try {
|
|
return getClass(classLoader, className.substring(0, lastDotIndex) + INNER_CLASS_SEPARATOR_CHAR + className.substring(lastDotIndex + 1),
|
|
initialize);
|
|
} catch (final ClassNotFoundException ignored) {
|
|
// ignore exception
|
|
}
|
|
}
|
|
|
|
throw ex;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Returns the (initialized) class represented by {@code className} using the current thread's context class loader.
|
|
* This implementation supports the syntaxes "{@code java.util.Map.Entry[]}", "{@code java.util.Map$Entry[]}",
|
|
* "{@code [Ljava.util.Map.Entry;}", and "{@code [Ljava.util.Map$Entry;}".
|
|
*
|
|
* @param className the class name
|
|
* @return the class represented by {@code className} using the current thread's context class loader
|
|
* @throws NullPointerException if the className is null
|
|
* @throws ClassNotFoundException if the class is not found
|
|
*/
|
|
public static Class<?> getClass(final String className) throws ClassNotFoundException {
|
|
return getClass(className, true);
|
|
}
|
|
|
|
/**
|
|
* Returns the class represented by {@code className} using the current thread's context class loader. This
|
|
* implementation supports the syntaxes "{@code java.util.Map.Entry[]}", "{@code java.util.Map$Entry[]}",
|
|
* "{@code [Ljava.util.Map.Entry;}", and "{@code [Ljava.util.Map$Entry;}".
|
|
*
|
|
* @param className the class name
|
|
* @param initialize whether the class must be initialized
|
|
* @return the class represented by {@code className} using the current thread's context class loader
|
|
* @throws NullPointerException if the className is null
|
|
* @throws ClassNotFoundException if the class is not found
|
|
*/
|
|
public static Class<?> getClass(final String className, final boolean initialize) throws ClassNotFoundException {
|
|
final ClassLoader contextCL = Thread.currentThread().getContextClassLoader();
|
|
final ClassLoader loader = contextCL == null ? ClassUtils.class.getClassLoader() : contextCL;
|
|
return getClass(loader, className, initialize);
|
|
}
|
|
|
|
/**
|
|
* Delegates to {@link Class#getComponentType()} using generics.
|
|
*
|
|
* @param <T> The array class type.
|
|
* @param cls A class or null.
|
|
* @return The array component type or null.
|
|
* @see Class#getComponentType()
|
|
* @since 3.13.0
|
|
*/
|
|
@SuppressWarnings("unchecked")
|
|
public static <T> Class<T> getComponentType(final Class<T[]> cls) {
|
|
return cls == null ? null : (Class<T>) cls.getComponentType();
|
|
}
|
|
|
|
/**
|
|
* <p>
|
|
* Null-safe version of {@code cls.getName()}
|
|
* </p>
|
|
*
|
|
* @param cls the class for which to get the class name; may be null
|
|
* @return the class name or the empty string in case the argument is {@code null}
|
|
* @since 3.7
|
|
* @see Class#getSimpleName()
|
|
*/
|
|
public static String getName(final Class<?> cls) {
|
|
return getName(cls, StringUtils.EMPTY);
|
|
}
|
|
|
|
/**
|
|
* <p>
|
|
* Null-safe version of {@code cls.getName()}
|
|
* </p>
|
|
*
|
|
* @param cls the class for which to get the class name; may be null
|
|
* @param valueIfNull the return value if the argument {@code cls} is {@code null}
|
|
* @return the class name or {@code valueIfNull}
|
|
* @since 3.7
|
|
* @see Class#getName()
|
|
*/
|
|
public static String getName(final Class<?> cls, final String valueIfNull) {
|
|
return cls == null ? valueIfNull : cls.getName();
|
|
}
|
|
|
|
/**
|
|
* <p>
|
|
* Null-safe version of {@code object.getClass().getName()}
|
|
* </p>
|
|
*
|
|
* @param object the object for which to get the class name; may be null
|
|
* @return the class name or the empty String
|
|
* @since 3.7
|
|
* @see Class#getSimpleName()
|
|
*/
|
|
public static String getName(final Object object) {
|
|
return getName(object, StringUtils.EMPTY);
|
|
}
|
|
|
|
/**
|
|
* <p>
|
|
* Null-safe version of {@code object.getClass().getSimpleName()}
|
|
* </p>
|
|
*
|
|
* @param object the object for which to get the class name; may be null
|
|
* @param valueIfNull the value to return if {@code object} is {@code null}
|
|
* @return the class name or {@code valueIfNull}
|
|
* @since 3.0
|
|
* @see Class#getName()
|
|
*/
|
|
public static String getName(final Object object, final String valueIfNull) {
|
|
return object == null ? valueIfNull : object.getClass().getName();
|
|
}
|
|
|
|
/**
|
|
* <p>
|
|
* Gets the package name from the canonical name of a {@link Class}.
|
|
* </p>
|
|
*
|
|
* @param cls the class to get the package name for, may be {@code null}.
|
|
* @return the package name or an empty string
|
|
* @since 2.4
|
|
*/
|
|
public static String getPackageCanonicalName(final Class<?> cls) {
|
|
if (cls == null) {
|
|
return StringUtils.EMPTY;
|
|
}
|
|
return getPackageCanonicalName(cls.getName());
|
|
}
|
|
|
|
/**
|
|
* <p>
|
|
* Gets the package name from the class name of an {@link Object}.
|
|
* </p>
|
|
*
|
|
* @param object the class to get the package name for, may be null
|
|
* @param valueIfNull the value to return if null
|
|
* @return the package name of the object, or the null value
|
|
* @since 2.4
|
|
*/
|
|
public static String getPackageCanonicalName(final Object object, final String valueIfNull) {
|
|
if (object == null) {
|
|
return valueIfNull;
|
|
}
|
|
return getPackageCanonicalName(object.getClass().getName());
|
|
}
|
|
|
|
/**
|
|
* <p>
|
|
* Gets the package name from the class name.
|
|
* </p>
|
|
*
|
|
* <p>
|
|
* The string passed in is assumed to be a class name - it is not checked.
|
|
* </p>
|
|
* <p>
|
|
* If the class is in the default package, return an empty string.
|
|
* </p>
|
|
*
|
|
* @param name the name to get the package name for, may be {@code null}
|
|
* @return the package name or an empty string
|
|
* @since 2.4
|
|
*/
|
|
public static String getPackageCanonicalName(final String name) {
|
|
return getPackageName(getCanonicalName(name));
|
|
}
|
|
|
|
/**
|
|
* <p>
|
|
* Gets the package name of a {@link Class}.
|
|
* </p>
|
|
*
|
|
* @param cls the class to get the package name for, may be {@code null}.
|
|
* @return the package name or an empty string
|
|
*/
|
|
public static String getPackageName(final Class<?> cls) {
|
|
if (cls == null) {
|
|
return StringUtils.EMPTY;
|
|
}
|
|
return getPackageName(cls.getName());
|
|
}
|
|
|
|
/**
|
|
* <p>
|
|
* Gets the package name of an {@link Object}.
|
|
* </p>
|
|
*
|
|
* @param object the class to get the package name for, may be null
|
|
* @param valueIfNull the value to return if null
|
|
* @return the package name of the object, or the null value
|
|
*/
|
|
public static String getPackageName(final Object object, final String valueIfNull) {
|
|
if (object == null) {
|
|
return valueIfNull;
|
|
}
|
|
return getPackageName(object.getClass());
|
|
}
|
|
|
|
/**
|
|
* <p>
|
|
* Gets the package name from a {@link String}.
|
|
* </p>
|
|
*
|
|
* <p>
|
|
* The string passed in is assumed to be a class name - it is not checked.
|
|
* </p>
|
|
* <p>
|
|
* If the class is unpackaged, return an empty string.
|
|
* </p>
|
|
*
|
|
* @param className the className to get the package name for, may be {@code null}
|
|
* @return the package name or an empty string
|
|
*/
|
|
public static String getPackageName(String className) {
|
|
if (StringUtils.isEmpty(className)) {
|
|
return StringUtils.EMPTY;
|
|
}
|
|
|
|
// Strip array encoding
|
|
while (className.charAt(0) == '[') {
|
|
className = className.substring(1);
|
|
}
|
|
// Strip Object type encoding
|
|
if (className.charAt(0) == 'L' && className.charAt(className.length() - 1) == ';') {
|
|
className = className.substring(1);
|
|
}
|
|
|
|
final int i = className.lastIndexOf(PACKAGE_SEPARATOR_CHAR);
|
|
if (i == -1) {
|
|
return StringUtils.EMPTY;
|
|
}
|
|
return className.substring(0, i);
|
|
}
|
|
|
|
/**
|
|
* <p>
|
|
* Returns the desired Method much like {@code Class.getMethod}, however it ensures that the returned Method is from a
|
|
* public class or interface and not from an anonymous inner class. This means that the Method is invokable and doesn't
|
|
* fall foul of Java bug <a href="http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4071957">4071957</a>).
|
|
* </p>
|
|
*
|
|
* <pre>
|
|
* <code>Set set = Collections.unmodifiableSet(...);
|
|
* Method method = ClassUtils.getPublicMethod(set.getClass(), "isEmpty", new Class[0]);
|
|
* Object result = method.invoke(set, new Object[]);</code>
|
|
* </pre>
|
|
*
|
|
* @param cls the class to check, not null
|
|
* @param methodName the name of the method
|
|
* @param parameterTypes the list of parameters
|
|
* @return the method
|
|
* @throws NullPointerException if the class is null
|
|
* @throws SecurityException if a security violation occurred
|
|
* @throws NoSuchMethodException if the method is not found in the given class or if the method doesn't conform with the
|
|
* requirements
|
|
*/
|
|
public static Method getPublicMethod(final Class<?> cls, final String methodName, final Class<?>... parameterTypes) throws NoSuchMethodException {
|
|
|
|
final Method declaredMethod = cls.getMethod(methodName, parameterTypes);
|
|
if (isPublic(declaredMethod.getDeclaringClass())) {
|
|
return declaredMethod;
|
|
}
|
|
|
|
final List<Class<?>> candidateClasses = new ArrayList<>(getAllInterfaces(cls));
|
|
candidateClasses.addAll(getAllSuperclasses(cls));
|
|
|
|
for (final Class<?> candidateClass : candidateClasses) {
|
|
if (!isPublic(candidateClass)) {
|
|
continue;
|
|
}
|
|
final Method candidateMethod;
|
|
try {
|
|
candidateMethod = candidateClass.getMethod(methodName, parameterTypes);
|
|
} catch (final NoSuchMethodException ex) {
|
|
continue;
|
|
}
|
|
if (Modifier.isPublic(candidateMethod.getDeclaringClass().getModifiers())) {
|
|
return candidateMethod;
|
|
}
|
|
}
|
|
|
|
throw new NoSuchMethodException("Can't find a public method for " + methodName + " " + ArrayUtils.toString(parameterTypes));
|
|
}
|
|
|
|
/**
|
|
* <p>
|
|
* Gets the canonical name minus the package name from a {@link Class}.
|
|
* </p>
|
|
*
|
|
* @param cls the class for which to get the short canonical class name; may be null
|
|
* @return the canonical name without the package name or an empty string
|
|
* @since 2.4
|
|
*/
|
|
public static String getShortCanonicalName(final Class<?> cls) {
|
|
if (cls == null) {
|
|
return StringUtils.EMPTY;
|
|
}
|
|
return getShortCanonicalName(cls.getName());
|
|
}
|
|
|
|
/**
|
|
* <p>
|
|
* Gets the canonical name minus the package name for an {@link Object}.
|
|
* </p>
|
|
*
|
|
* @param object the class to get the short name for, may be null
|
|
* @param valueIfNull the value to return if null
|
|
* @return the canonical name of the object without the package name, or the null value
|
|
* @since 2.4
|
|
*/
|
|
public static String getShortCanonicalName(final Object object, final String valueIfNull) {
|
|
if (object == null) {
|
|
return valueIfNull;
|
|
}
|
|
return getShortCanonicalName(object.getClass().getName());
|
|
}
|
|
|
|
/**
|
|
* <p>
|
|
* Gets the canonical name minus the package name from a String.
|
|
* </p>
|
|
*
|
|
* <p>
|
|
* The string passed in is assumed to be a class name - it is not checked.
|
|
* </p>
|
|
*
|
|
* <p>
|
|
* Note that this method is mainly designed to handle the arrays and primitives properly. If the class is an inner class
|
|
* then the result value will not contain the outer classes. This way the behavior of this method is different from
|
|
* {@link #getShortClassName(String)}. The argument in that case is class name and not canonical name and the return
|
|
* value retains the outer classes.
|
|
* </p>
|
|
*
|
|
* <p>
|
|
* Note that there is no way to reliably identify the part of the string representing the package hierarchy and the part
|
|
* that is the outer class or classes in case of an inner class. Trying to find the class would require reflective call
|
|
* and the class itself may not even be on the class path. Relying on the fact that class names start with capital
|
|
* letter and packages with lower case is heuristic.
|
|
* </p>
|
|
*
|
|
* <p>
|
|
* It is recommended to use {@link #getShortClassName(String)} for cases when the class is an inner class and use this
|
|
* method for cases it is designed for.
|
|
* </p>
|
|
*
|
|
* <table>
|
|
* <caption>Examples</caption>
|
|
* <tr>
|
|
* <td>return value</td>
|
|
* <td>input</td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>{@code ""}</td>
|
|
* <td>{@code (String)null}</td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>{@code "Map.Entry"}</td>
|
|
* <td>{@code java.util.Map.Entry.class.getName()}</td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>{@code "Entry"}</td>
|
|
* <td>{@code java.util.Map.Entry.class.getCanonicalName()}</td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>{@code "ClassUtils"}</td>
|
|
* <td>{@code "org.apache.commons.lang3.ClassUtils"}</td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>{@code "ClassUtils[]"}</td>
|
|
* <td>{@code "[Lorg.apache.commons.lang3.ClassUtils;"}</td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>{@code "ClassUtils[][]"}</td>
|
|
* <td>{@code "[[Lorg.apache.commons.lang3.ClassUtils;"}</td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>{@code "ClassUtils[]"}</td>
|
|
* <td>{@code "org.apache.commons.lang3.ClassUtils[]"}</td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>{@code "ClassUtils[][]"}</td>
|
|
* <td>{@code "org.apache.commons.lang3.ClassUtils[][]"}</td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>{@code "int[]"}</td>
|
|
* <td>{@code "[I"}</td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>{@code "int[]"}</td>
|
|
* <td>{@code int[].class.getCanonicalName()}</td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>{@code "int[]"}</td>
|
|
* <td>{@code int[].class.getName()}</td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>{@code "int[][]"}</td>
|
|
* <td>{@code "[[I"}</td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>{@code "int[]"}</td>
|
|
* <td>{@code "int[]"}</td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>{@code "int[][]"}</td>
|
|
* <td>{@code "int[][]"}</td>
|
|
* </tr>
|
|
* </table>
|
|
*
|
|
* @param canonicalName the class name to get the short name for
|
|
* @return the canonical name of the class without the package name or an empty string
|
|
* @since 2.4
|
|
*/
|
|
public static String getShortCanonicalName(final String canonicalName) {
|
|
return getShortClassName(getCanonicalName(canonicalName));
|
|
}
|
|
|
|
/**
|
|
* <p>
|
|
* Gets the class name minus the package name from a {@link Class}.
|
|
* </p>
|
|
*
|
|
* <p>
|
|
* This method simply gets the name using {@code Class.getName()} and then calls {@link #getShortClassName(Class)}. See
|
|
* relevant notes there.
|
|
* </p>
|
|
*
|
|
* @param cls the class to get the short name for.
|
|
* @return the class name without the package name or an empty string. If the class is an inner class then the returned
|
|
* value will contain the outer class or classes separated with {@code .} (dot) character.
|
|
*/
|
|
public static String getShortClassName(final Class<?> cls) {
|
|
if (cls == null) {
|
|
return StringUtils.EMPTY;
|
|
}
|
|
return getShortClassName(cls.getName());
|
|
}
|
|
|
|
/**
|
|
* <p>
|
|
* Gets the class name of the {@code object} without the package name or names.
|
|
* </p>
|
|
*
|
|
* <p>
|
|
* The method looks up the class of the object and then converts the name of the class invoking
|
|
* {@link #getShortClassName(Class)} (see relevant notes there).
|
|
* </p>
|
|
*
|
|
* @param object the class to get the short name for, may be {@code null}
|
|
* @param valueIfNull the value to return if the object is {@code null}
|
|
* @return the class name of the object without the package name, or {@code valueIfNull} if the argument {@code object}
|
|
* is {@code null}
|
|
*/
|
|
public static String getShortClassName(final Object object, final String valueIfNull) {
|
|
if (object == null) {
|
|
return valueIfNull;
|
|
}
|
|
return getShortClassName(object.getClass());
|
|
}
|
|
|
|
/**
|
|
* <p>
|
|
* Gets the class name minus the package name from a String.
|
|
* </p>
|
|
*
|
|
* <p>
|
|
* The string passed in is assumed to be a class name - it is not checked. The string has to be formatted the way as the
|
|
* JDK method {@code Class.getName()} returns it, and not the usual way as we write it, for example in import
|
|
* statements, or as it is formatted by {@code Class.getCanonicalName()}.
|
|
* </p>
|
|
*
|
|
* <p>
|
|
* The difference is is significant only in case of classes that are inner classes of some other classes. In this case
|
|
* the separator between the outer and inner class (possibly on multiple hierarchy level) has to be {@code $} (dollar
|
|
* sign) and not {@code .} (dot), as it is returned by {@code Class.getName()}
|
|
* </p>
|
|
*
|
|
* <p>
|
|
* Note that this method is called from the {@link #getShortClassName(Class)} method using the string returned by
|
|
* {@code Class.getName()}.
|
|
* </p>
|
|
*
|
|
* <p>
|
|
* Note that this method differs from {@link #getSimpleName(Class)} in that this will return, for example
|
|
* {@code "Map.Entry"} whilst the {@code java.lang.Class} variant will simply return {@code "Entry"}. In this example
|
|
* the argument {@code className} is the string {@code java.util.Map$Entry} (note the {@code $} sign.
|
|
* </p>
|
|
*
|
|
* @param className the className to get the short name for. It has to be formatted as returned by
|
|
* {@code Class.getName()} and not {@code Class.getCanonicalName()}
|
|
* @return the class name of the class without the package name or an empty string. If the class is an inner class then
|
|
* value contains the outer class or classes and the separator is replaced to be {@code .} (dot) character.
|
|
*/
|
|
public static String getShortClassName(String className) {
|
|
if (StringUtils.isEmpty(className)) {
|
|
return StringUtils.EMPTY;
|
|
}
|
|
|
|
final StringBuilder arrayPrefix = new StringBuilder();
|
|
|
|
// Handle array encoding
|
|
if (className.startsWith("[")) {
|
|
while (className.charAt(0) == '[') {
|
|
className = className.substring(1);
|
|
arrayPrefix.append("[]");
|
|
}
|
|
// Strip Object type encoding
|
|
if (className.charAt(0) == 'L' && className.charAt(className.length() - 1) == ';') {
|
|
className = className.substring(1, className.length() - 1);
|
|
}
|
|
|
|
if (reverseAbbreviationMap.containsKey(className)) {
|
|
className = reverseAbbreviationMap.get(className);
|
|
}
|
|
}
|
|
|
|
final int lastDotIdx = className.lastIndexOf(PACKAGE_SEPARATOR_CHAR);
|
|
final int innerIdx = className.indexOf(INNER_CLASS_SEPARATOR_CHAR, lastDotIdx == -1 ? 0 : lastDotIdx + 1);
|
|
String out = className.substring(lastDotIdx + 1);
|
|
if (innerIdx != -1) {
|
|
out = out.replace(INNER_CLASS_SEPARATOR_CHAR, PACKAGE_SEPARATOR_CHAR);
|
|
}
|
|
return out + arrayPrefix;
|
|
}
|
|
|
|
/**
|
|
* <p>
|
|
* Null-safe version of {@code cls.getSimpleName()}
|
|
* </p>
|
|
*
|
|
* @param cls the class for which to get the simple name; may be null
|
|
* @return the simple class name or the empty string in case the argument is {@code null}
|
|
* @since 3.0
|
|
* @see Class#getSimpleName()
|
|
*/
|
|
public static String getSimpleName(final Class<?> cls) {
|
|
return getSimpleName(cls, StringUtils.EMPTY);
|
|
}
|
|
|
|
/**
|
|
* <p>
|
|
* Null-safe version of {@code cls.getSimpleName()}
|
|
* </p>
|
|
*
|
|
* @param cls the class for which to get the simple name; may be null
|
|
* @param valueIfNull the value to return if null
|
|
* @return the simple class name or {@code valueIfNull} if the argument {@code cls} is {@code null}
|
|
* @since 3.0
|
|
* @see Class#getSimpleName()
|
|
*/
|
|
public static String getSimpleName(final Class<?> cls, final String valueIfNull) {
|
|
return cls == null ? valueIfNull : cls.getSimpleName();
|
|
}
|
|
|
|
/**
|
|
* <p>
|
|
* Null-safe version of {@code object.getClass().getSimpleName()}
|
|
* </p>
|
|
*
|
|
* <p>
|
|
* It is to note that this method is overloaded and in case the argument {@code object} is a {@link Class} object then
|
|
* the {@link #getSimpleName(Class)} will be invoked. If this is a significant possibility then the caller should check
|
|
* this case and call {@code
|
|
* getSimpleName(Class.class)} or just simply use the string literal {@code "Class"}, which is the result of the method
|
|
* in that case.
|
|
* </p>
|
|
*
|
|
* @param object the object for which to get the simple class name; may be null
|
|
* @return the simple class name or the empty string in case the argument is {@code null}
|
|
* @since 3.7
|
|
* @see Class#getSimpleName()
|
|
*/
|
|
public static String getSimpleName(final Object object) {
|
|
return getSimpleName(object, StringUtils.EMPTY);
|
|
}
|
|
|
|
/**
|
|
* <p>
|
|
* Null-safe version of {@code object.getClass().getSimpleName()}
|
|
* </p>
|
|
*
|
|
* @param object the object for which to get the simple class name; may be null
|
|
* @param valueIfNull the value to return if {@code object} is {@code null}
|
|
* @return the simple class name or {@code valueIfNull} if the argument {@code object} is {@code null}
|
|
* @since 3.0
|
|
* @see Class#getSimpleName()
|
|
*/
|
|
public static String getSimpleName(final Object object, final String valueIfNull) {
|
|
return object == null ? valueIfNull : object.getClass().getSimpleName();
|
|
}
|
|
|
|
/**
|
|
* Gets an {@link Iterable} that can iterate over a class hierarchy in ascending (subclass to superclass) order,
|
|
* excluding interfaces.
|
|
*
|
|
* @param type the type to get the class hierarchy from
|
|
* @return Iterable an Iterable over the class hierarchy of the given class
|
|
* @since 3.2
|
|
*/
|
|
public static Iterable<Class<?>> hierarchy(final Class<?> type) {
|
|
return hierarchy(type, Interfaces.EXCLUDE);
|
|
}
|
|
|
|
/**
|
|
* Gets an {@link Iterable} that can iterate over a class hierarchy in ascending (subclass to superclass) order.
|
|
*
|
|
* @param type the type to get the class hierarchy from
|
|
* @param interfacesBehavior switch indicating whether to include or exclude interfaces
|
|
* @return Iterable an Iterable over the class hierarchy of the given class
|
|
* @since 3.2
|
|
*/
|
|
public static Iterable<Class<?>> hierarchy(final Class<?> type, final Interfaces interfacesBehavior) {
|
|
final Iterable<Class<?>> classes = () -> {
|
|
final MutableObject<Class<?>> next = new MutableObject<>(type);
|
|
return new Iterator<Class<?>>() {
|
|
|
|
@Override
|
|
public boolean hasNext() {
|
|
return next.getValue() != null;
|
|
}
|
|
|
|
@Override
|
|
public Class<?> next() {
|
|
final Class<?> result = next.getValue();
|
|
next.setValue(result.getSuperclass());
|
|
return result;
|
|
}
|
|
|
|
@Override
|
|
public void remove() {
|
|
throw new UnsupportedOperationException();
|
|
}
|
|
|
|
};
|
|
};
|
|
if (interfacesBehavior != Interfaces.INCLUDE) {
|
|
return classes;
|
|
}
|
|
return () -> {
|
|
final Set<Class<?>> seenInterfaces = new HashSet<>();
|
|
final Iterator<Class<?>> wrapped = classes.iterator();
|
|
|
|
return new Iterator<Class<?>>() {
|
|
Iterator<Class<?>> interfaces = Collections.emptyIterator();
|
|
|
|
@Override
|
|
public boolean hasNext() {
|
|
return interfaces.hasNext() || wrapped.hasNext();
|
|
}
|
|
|
|
@Override
|
|
public Class<?> next() {
|
|
if (interfaces.hasNext()) {
|
|
final Class<?> nextInterface = interfaces.next();
|
|
seenInterfaces.add(nextInterface);
|
|
return nextInterface;
|
|
}
|
|
final Class<?> nextSuperclass = wrapped.next();
|
|
final Set<Class<?>> currentInterfaces = new LinkedHashSet<>();
|
|
walkInterfaces(currentInterfaces, nextSuperclass);
|
|
interfaces = currentInterfaces.iterator();
|
|
return nextSuperclass;
|
|
}
|
|
|
|
@Override
|
|
public void remove() {
|
|
throw new UnsupportedOperationException();
|
|
}
|
|
|
|
private void walkInterfaces(final Set<Class<?>> addTo, final Class<?> c) {
|
|
for (final Class<?> iface : c.getInterfaces()) {
|
|
if (!seenInterfaces.contains(iface)) {
|
|
addTo.add(iface);
|
|
}
|
|
walkInterfaces(addTo, iface);
|
|
}
|
|
}
|
|
|
|
};
|
|
};
|
|
}
|
|
|
|
/**
|
|
* <p>
|
|
* Checks if one {@link Class} can be assigned to a variable of another {@link Class}.
|
|
* </p>
|
|
*
|
|
* <p>
|
|
* Unlike the {@link Class#isAssignableFrom(java.lang.Class)} method, this method takes into account widenings of
|
|
* primitive classes and {@code null}s.
|
|
* </p>
|
|
*
|
|
* <p>
|
|
* Primitive widenings allow an int to be assigned to a long, float or double. This method returns the correct result
|
|
* for these cases.
|
|
* </p>
|
|
*
|
|
* <p>
|
|
* {@code null} may be assigned to any reference type. This method will return {@code true} if {@code null} is passed in
|
|
* and the toClass is non-primitive.
|
|
* </p>
|
|
*
|
|
* <p>
|
|
* Specifically, this method tests whether the type represented by the specified {@link Class} parameter can be
|
|
* converted to the type represented by this {@link Class} object via an identity conversion widening primitive or
|
|
* widening reference conversion. See <em><a href="http://docs.oracle.com/javase/specs/">The Java Language
|
|
* Specification</a></em>, sections 5.1.1, 5.1.2 and 5.1.4 for details.
|
|
* </p>
|
|
*
|
|
* <p>
|
|
* <strong>Since Lang 3.0,</strong> this method will default behavior for calculating assignability between primitive
|
|
* and wrapper types <em>corresponding to the running Java version</em>; i.e. autoboxing will be the default behavior in
|
|
* VMs running Java versions > 1.5.
|
|
* </p>
|
|
*
|
|
* @param cls the Class to check, may be null
|
|
* @param toClass the Class to try to assign into, returns false if null
|
|
* @return {@code true} if assignment possible
|
|
*/
|
|
public static boolean isAssignable(final Class<?> cls, final Class<?> toClass) {
|
|
return isAssignable(cls, toClass, true);
|
|
}
|
|
|
|
/**
|
|
* <p>
|
|
* Checks if one {@link Class} can be assigned to a variable of another {@link Class}.
|
|
* </p>
|
|
*
|
|
* <p>
|
|
* Unlike the {@link Class#isAssignableFrom(java.lang.Class)} method, this method takes into account widenings of
|
|
* primitive classes and {@code null}s.
|
|
* </p>
|
|
*
|
|
* <p>
|
|
* Primitive widenings allow an int to be assigned to a long, float or double. This method returns the correct result
|
|
* for these cases.
|
|
* </p>
|
|
*
|
|
* <p>
|
|
* {@code null} may be assigned to any reference type. This method will return {@code true} if {@code null} is passed in
|
|
* and the toClass is non-primitive.
|
|
* </p>
|
|
*
|
|
* <p>
|
|
* Specifically, this method tests whether the type represented by the specified {@link Class} parameter can be
|
|
* converted to the type represented by this {@link Class} object via an identity conversion widening primitive or
|
|
* widening reference conversion. See <em><a href="http://docs.oracle.com/javase/specs/">The Java Language
|
|
* Specification</a></em>, sections 5.1.1, 5.1.2 and 5.1.4 for details.
|
|
* </p>
|
|
*
|
|
* @param cls the Class to check, may be null
|
|
* @param toClass the Class to try to assign into, returns false if null
|
|
* @param autoboxing whether to use implicit autoboxing/unboxing between primitives and wrappers
|
|
* @return {@code true} if assignment possible
|
|
*/
|
|
public static boolean isAssignable(Class<?> cls, final Class<?> toClass, final boolean autoboxing) {
|
|
if (toClass == null) {
|
|
return false;
|
|
}
|
|
// have to check for null, as isAssignableFrom doesn't
|
|
if (cls == null) {
|
|
return !toClass.isPrimitive();
|
|
}
|
|
// autoboxing:
|
|
if (autoboxing) {
|
|
if (cls.isPrimitive() && !toClass.isPrimitive()) {
|
|
cls = primitiveToWrapper(cls);
|
|
if (cls == null) {
|
|
return false;
|
|
}
|
|
}
|
|
if (toClass.isPrimitive() && !cls.isPrimitive()) {
|
|
cls = wrapperToPrimitive(cls);
|
|
if (cls == null) {
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
if (cls.equals(toClass)) {
|
|
return true;
|
|
}
|
|
if (cls.isPrimitive()) {
|
|
if (!toClass.isPrimitive()) {
|
|
return false;
|
|
}
|
|
if (Integer.TYPE.equals(cls)) {
|
|
return Long.TYPE.equals(toClass) || Float.TYPE.equals(toClass) || Double.TYPE.equals(toClass);
|
|
}
|
|
if (Long.TYPE.equals(cls)) {
|
|
return Float.TYPE.equals(toClass) || Double.TYPE.equals(toClass);
|
|
}
|
|
if (Boolean.TYPE.equals(cls)) {
|
|
return false;
|
|
}
|
|
if (Double.TYPE.equals(cls)) {
|
|
return false;
|
|
}
|
|
if (Float.TYPE.equals(cls)) {
|
|
return Double.TYPE.equals(toClass);
|
|
}
|
|
if (Character.TYPE.equals(cls) || Short.TYPE.equals(cls)) {
|
|
return Integer.TYPE.equals(toClass) || Long.TYPE.equals(toClass) || Float.TYPE.equals(toClass) || Double.TYPE.equals(toClass);
|
|
}
|
|
if (Byte.TYPE.equals(cls)) {
|
|
return Short.TYPE.equals(toClass) || Integer.TYPE.equals(toClass) || Long.TYPE.equals(toClass) || Float.TYPE.equals(toClass)
|
|
|| Double.TYPE.equals(toClass);
|
|
}
|
|
// should never get here
|
|
return false;
|
|
}
|
|
return toClass.isAssignableFrom(cls);
|
|
}
|
|
|
|
/**
|
|
* <p>
|
|
* Checks if an array of Classes can be assigned to another array of Classes.
|
|
* </p>
|
|
*
|
|
* <p>
|
|
* This method calls {@link #isAssignable(Class, Class) isAssignable} for each Class pair in the input arrays. It can be
|
|
* used to check if a set of arguments (the first parameter) are suitably compatible with a set of method parameter
|
|
* types (the second parameter).
|
|
* </p>
|
|
*
|
|
* <p>
|
|
* Unlike the {@link Class#isAssignableFrom(java.lang.Class)} method, this method takes into account widenings of
|
|
* primitive classes and {@code null}s.
|
|
* </p>
|
|
*
|
|
* <p>
|
|
* Primitive widenings allow an int to be assigned to a {@code long}, {@code float} or {@code double}. This method
|
|
* returns the correct result for these cases.
|
|
* </p>
|
|
*
|
|
* <p>
|
|
* {@code null} may be assigned to any reference type. This method will return {@code true} if {@code null} is passed in
|
|
* and the toClass is non-primitive.
|
|
* </p>
|
|
*
|
|
* <p>
|
|
* Specifically, this method tests whether the type represented by the specified {@link Class} parameter can be
|
|
* converted to the type represented by this {@link Class} object via an identity conversion widening primitive or
|
|
* widening reference conversion. See <em><a href="http://docs.oracle.com/javase/specs/">The Java Language
|
|
* Specification</a></em>, sections 5.1.1, 5.1.2 and 5.1.4 for details.
|
|
* </p>
|
|
*
|
|
* <p>
|
|
* <strong>Since Lang 3.0,</strong> this method will default behavior for calculating assignability between primitive
|
|
* and wrapper types <em>corresponding to the running Java version</em>; i.e. autoboxing will be the default behavior in
|
|
* VMs running Java versions > 1.5.
|
|
* </p>
|
|
*
|
|
* @param classArray the array of Classes to check, may be {@code null}
|
|
* @param toClassArray the array of Classes to try to assign into, may be {@code null}
|
|
* @return {@code true} if assignment possible
|
|
*/
|
|
public static boolean isAssignable(final Class<?>[] classArray, final Class<?>... toClassArray) {
|
|
return isAssignable(classArray, toClassArray, true);
|
|
}
|
|
|
|
/**
|
|
* <p>
|
|
* Checks if an array of Classes can be assigned to another array of Classes.
|
|
* </p>
|
|
*
|
|
* <p>
|
|
* This method calls {@link #isAssignable(Class, Class) isAssignable} for each Class pair in the input arrays. It can be
|
|
* used to check if a set of arguments (the first parameter) are suitably compatible with a set of method parameter
|
|
* types (the second parameter).
|
|
* </p>
|
|
*
|
|
* <p>
|
|
* Unlike the {@link Class#isAssignableFrom(java.lang.Class)} method, this method takes into account widenings of
|
|
* primitive classes and {@code null}s.
|
|
* </p>
|
|
*
|
|
* <p>
|
|
* Primitive widenings allow an int to be assigned to a {@code long}, {@code float} or {@code double}. This method
|
|
* returns the correct result for these cases.
|
|
* </p>
|
|
*
|
|
* <p>
|
|
* {@code null} may be assigned to any reference type. This method will return {@code true} if {@code null} is passed in
|
|
* and the toClass is non-primitive.
|
|
* </p>
|
|
*
|
|
* <p>
|
|
* Specifically, this method tests whether the type represented by the specified {@link Class} parameter can be
|
|
* converted to the type represented by this {@link Class} object via an identity conversion widening primitive or
|
|
* widening reference conversion. See <em><a href="http://docs.oracle.com/javase/specs/">The Java Language
|
|
* Specification</a></em>, sections 5.1.1, 5.1.2 and 5.1.4 for details.
|
|
* </p>
|
|
*
|
|
* @param classArray the array of Classes to check, may be {@code null}
|
|
* @param toClassArray the array of Classes to try to assign into, may be {@code null}
|
|
* @param autoboxing whether to use implicit autoboxing/unboxing between primitives and wrappers
|
|
* @return {@code true} if assignment possible
|
|
*/
|
|
public static boolean isAssignable(Class<?>[] classArray, Class<?>[] toClassArray, final boolean autoboxing) {
|
|
if (!ArrayUtils.isSameLength(classArray, toClassArray)) {
|
|
return false;
|
|
}
|
|
if (classArray == null) {
|
|
classArray = ArrayUtils.EMPTY_CLASS_ARRAY;
|
|
}
|
|
if (toClassArray == null) {
|
|
toClassArray = ArrayUtils.EMPTY_CLASS_ARRAY;
|
|
}
|
|
for (int i = 0; i < classArray.length; i++) {
|
|
if (!isAssignable(classArray[i], toClassArray[i], autoboxing)) {
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* <p>
|
|
* Is the specified class an inner class or static nested class.
|
|
* </p>
|
|
*
|
|
* @param cls the class to check, may be null
|
|
* @return {@code true} if the class is an inner or static nested class, false if not or {@code null}
|
|
*/
|
|
public static boolean isInnerClass(final Class<?> cls) {
|
|
return cls != null && cls.getEnclosingClass() != null;
|
|
}
|
|
|
|
/**
|
|
* Tests whether a {@link Class} is public.
|
|
* @param cls Class to test.
|
|
* @return {@code true} if {@code cls} is public.
|
|
* @since 3.13.0
|
|
*/
|
|
public static boolean isPublic(final Class<?> cls) {
|
|
return Modifier.isPublic(cls.getModifiers());
|
|
}
|
|
/**
|
|
* Returns whether the given {@code type} is a primitive or primitive wrapper ({@link Boolean}, {@link Byte},
|
|
* {@link Character}, {@link Short}, {@link Integer}, {@link Long}, {@link Double}, {@link Float}).
|
|
*
|
|
* @param type The class to query or null.
|
|
* @return true if the given {@code type} is a primitive or primitive wrapper ({@link Boolean}, {@link Byte},
|
|
* {@link Character}, {@link Short}, {@link Integer}, {@link Long}, {@link Double}, {@link Float}).
|
|
* @since 3.1
|
|
*/
|
|
public static boolean isPrimitiveOrWrapper(final Class<?> type) {
|
|
if (type == null) {
|
|
return false;
|
|
}
|
|
return type.isPrimitive() || isPrimitiveWrapper(type);
|
|
}
|
|
|
|
/**
|
|
* Returns whether the given {@code type} is a primitive wrapper ({@link Boolean}, {@link Byte}, {@link Character},
|
|
* {@link Short}, {@link Integer}, {@link Long}, {@link Double}, {@link Float}).
|
|
*
|
|
* @param type The class to query or null.
|
|
* @return true if the given {@code type} is a primitive wrapper ({@link Boolean}, {@link Byte}, {@link Character},
|
|
* {@link Short}, {@link Integer}, {@link Long}, {@link Double}, {@link Float}).
|
|
* @since 3.1
|
|
*/
|
|
public static boolean isPrimitiveWrapper(final Class<?> type) {
|
|
return wrapperPrimitiveMap.containsKey(type);
|
|
}
|
|
|
|
/**
|
|
* <p>
|
|
* Converts the specified array of primitive Class objects to an array of its corresponding wrapper Class objects.
|
|
* </p>
|
|
*
|
|
* @param classes the class array to convert, may be null or empty
|
|
* @return an array which contains for each given class, the wrapper class or the original class if class is not a
|
|
* primitive. {@code null} if null input. Empty array if an empty array passed in.
|
|
* @since 2.1
|
|
*/
|
|
public static Class<?>[] primitivesToWrappers(final Class<?>... classes) {
|
|
if (classes == null) {
|
|
return null;
|
|
}
|
|
|
|
if (classes.length == 0) {
|
|
return classes;
|
|
}
|
|
|
|
final Class<?>[] convertedClasses = new Class[classes.length];
|
|
for (int i = 0; i < classes.length; i++) {
|
|
convertedClasses[i] = primitiveToWrapper(classes[i]);
|
|
}
|
|
return convertedClasses;
|
|
}
|
|
|
|
/**
|
|
* <p>
|
|
* Converts the specified primitive Class object to its corresponding wrapper Class object.
|
|
* </p>
|
|
*
|
|
* <p>
|
|
* NOTE: From v2.2, this method handles {@code Void.TYPE}, returning {@code Void.TYPE}.
|
|
* </p>
|
|
*
|
|
* @param cls the class to convert, may be null
|
|
* @return the wrapper class for {@code cls} or {@code cls} if {@code cls} is not a primitive. {@code null} if null
|
|
* input.
|
|
* @since 2.1
|
|
*/
|
|
public static Class<?> primitiveToWrapper(final Class<?> cls) {
|
|
Class<?> convertedClass = cls;
|
|
if (cls != null && cls.isPrimitive()) {
|
|
convertedClass = primitiveWrapperMap.get(cls);
|
|
}
|
|
return convertedClass;
|
|
}
|
|
|
|
/**
|
|
* Converts a class name to a JLS style class name.
|
|
*
|
|
* @param className the class name
|
|
* @return the converted name
|
|
* @throws NullPointerException if the className is null
|
|
*/
|
|
private static String toCanonicalName(String className) {
|
|
className = StringUtils.deleteWhitespace(className);
|
|
Validate.notNull(className, "className");
|
|
if (className.endsWith("[]")) {
|
|
final StringBuilder classNameBuffer = new StringBuilder();
|
|
while (className.endsWith("[]")) {
|
|
className = className.substring(0, className.length() - 2);
|
|
classNameBuffer.append("[");
|
|
}
|
|
final String abbreviation = abbreviationMap.get(className);
|
|
if (abbreviation != null) {
|
|
classNameBuffer.append(abbreviation);
|
|
} else {
|
|
classNameBuffer.append("L").append(className).append(";");
|
|
}
|
|
className = classNameBuffer.toString();
|
|
}
|
|
return className;
|
|
}
|
|
|
|
/**
|
|
* <p>
|
|
* Converts an array of {@link Object} in to an array of {@link Class} objects. If any of these objects is null, a null
|
|
* element will be inserted into the array.
|
|
* </p>
|
|
*
|
|
* <p>
|
|
* This method returns {@code null} for a {@code null} input array.
|
|
* </p>
|
|
*
|
|
* @param array an {@link Object} array
|
|
* @return a {@link Class} array, {@code null} if null array input
|
|
* @since 2.4
|
|
*/
|
|
public static Class<?>[] toClass(final Object... array) {
|
|
if (array == null) {
|
|
return null;
|
|
}
|
|
if (array.length == 0) {
|
|
return ArrayUtils.EMPTY_CLASS_ARRAY;
|
|
}
|
|
final Class<?>[] classes = new Class[array.length];
|
|
for (int i = 0; i < array.length; i++) {
|
|
classes[i] = array[i] == null ? null : array[i].getClass();
|
|
}
|
|
return classes;
|
|
}
|
|
|
|
/**
|
|
* <p>
|
|
* Decides if the part that was just copied to its destination location in the work array can be kept as it was copied
|
|
* or must be abbreviated. It must be kept when the part is the last one, which is the simple name of the class. In this
|
|
* case the {@code source} index, from where the characters are copied points one position after the last character,
|
|
* a.k.a. {@code source ==
|
|
* originalLength}
|
|
* </p>
|
|
*
|
|
* <p>
|
|
* If the part is not the last one then it can be kept unabridged if the number of the characters copied so far plus the
|
|
* character that are to be copied is less than or equal to the desired length.
|
|
* </p>
|
|
*
|
|
* @param runAheadTarget the target index (where the characters were copied to) pointing after the last character copied
|
|
* when the current part was copied
|
|
* @param source the source index (where the characters were copied from) pointing after the last character copied when
|
|
* the current part was copied
|
|
* @param originalLength the original length of the class full name, which is abbreviated
|
|
* @param desiredLength the desired length of the abbreviated class name
|
|
* @return {@code true} if it can be kept in its original length {@code false} if the current part has to be abbreviated
|
|
* and
|
|
*/
|
|
private static boolean useFull(final int runAheadTarget, final int source, final int originalLength, final int desiredLength) {
|
|
return source >= originalLength || runAheadTarget + originalLength - source <= desiredLength;
|
|
}
|
|
|
|
/**
|
|
* <p>
|
|
* Converts the specified array of wrapper Class objects to an array of its corresponding primitive Class objects.
|
|
* </p>
|
|
*
|
|
* <p>
|
|
* This method invokes {@code wrapperToPrimitive()} for each element of the passed in array.
|
|
* </p>
|
|
*
|
|
* @param classes the class array to convert, may be null or empty
|
|
* @return an array which contains for each given class, the primitive class or <b>null</b> if the original class is not
|
|
* a wrapper class. {@code null} if null input. Empty array if an empty array passed in.
|
|
* @see #wrapperToPrimitive(Class)
|
|
* @since 2.4
|
|
*/
|
|
public static Class<?>[] wrappersToPrimitives(final Class<?>... classes) {
|
|
if (classes == null) {
|
|
return null;
|
|
}
|
|
|
|
if (classes.length == 0) {
|
|
return classes;
|
|
}
|
|
|
|
final Class<?>[] convertedClasses = new Class[classes.length];
|
|
for (int i = 0; i < classes.length; i++) {
|
|
convertedClasses[i] = wrapperToPrimitive(classes[i]);
|
|
}
|
|
return convertedClasses;
|
|
}
|
|
|
|
/**
|
|
* <p>
|
|
* Converts the specified wrapper class to its corresponding primitive class.
|
|
* </p>
|
|
*
|
|
* <p>
|
|
* This method is the counter part of {@code primitiveToWrapper()}. If the passed in class is a wrapper class for a
|
|
* primitive type, this primitive type will be returned (e.g. {@code Integer.TYPE} for {@code Integer.class}). For other
|
|
* classes, or if the parameter is <b>null</b>, the return value is <b>null</b>.
|
|
* </p>
|
|
*
|
|
* @param cls the class to convert, may be <b>null</b>
|
|
* @return the corresponding primitive type if {@code cls} is a wrapper class, <b>null</b> otherwise
|
|
* @see #primitiveToWrapper(Class)
|
|
* @since 2.4
|
|
*/
|
|
public static Class<?> wrapperToPrimitive(final Class<?> cls) {
|
|
return wrapperPrimitiveMap.get(cls);
|
|
}
|
|
|
|
/**
|
|
* <p>
|
|
* ClassUtils instances should NOT be constructed in standard programming. Instead, the class should be used as
|
|
* {@code ClassUtils.getShortClassName(cls)}.
|
|
* </p>
|
|
*
|
|
* <p>
|
|
* This constructor is public to permit tools that require a JavaBean instance to operate.
|
|
* </p>
|
|
*/
|
|
public ClassUtils() {
|
|
}
|
|
|
|
}
|