Add CompareToBuilder for building compareTo methods
git-svn-id: https://svn.apache.org/repos/asf/jakarta/commons/proper/lang/trunk@137022 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Stephen Colebourne
parent
93e8c0a19d
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9a3f8a3e9c
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/* ====================================================================
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* The Apache Software License, Version 1.1
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*
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* Copyright (c) 2002 The Apache Software Foundation. All rights
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* reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. The end-user documentation included with the redistribution, if
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* any, must include the following acknowlegement:
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* "This product includes software developed by the
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* Apache Software Foundation (http://www.apache.org/)."
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* Alternately, this acknowlegement may appear in the software itself,
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* if and wherever such third-party acknowlegements normally appear.
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*
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* 4. The names "The Jakarta Project", "Commons", and "Apache Software
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* Foundation" must not be used to endorse or promote products derived
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* from this software without prior written permission. For written
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* permission, please contact apache@apache.org.
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*
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* 5. Products derived from this software may not be called "Apache"
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* nor may "Apache" appear in their names without prior written
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* permission of the Apache Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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* ====================================================================
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*
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* This software consists of voluntary contributions made by many
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* individuals on behalf of the Apache Software Foundation. For more
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* information on the Apache Software Foundation, please see
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* <http://www.apache.org/>.
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*/
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package org.apache.commons.lang.builder;
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import java.lang.reflect.Field;
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import java.lang.reflect.Modifier;
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import org.apache.commons.lang.NumberUtils;
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/**
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* <code>CompareTo</code> generation routines.
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* <p>
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* This class provides methods to build a good <comde>compareTo()</code> method for any class.
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* It is consistent with the <code>equals</code> and <code>hashcode</code> built
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* with EqualsBuilder and HashCodeBuilder.
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* <p>
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* Two object that compare equal using equals should compare equals using
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* compareTo.
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* <p>
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* All relevant fields should be included in the calculation of the comparison. Derived
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* fields may be ignored. The same fields, in the same order, should be used in
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* both <code>compareTo</code> and <code>equals</code>.
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* <p>
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* Typical use for the code is as follows:
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*
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* <pre>
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* public int comapareTo(Object o) {
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* MyClass rhs = (MyClass) o;
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* return new CompareToBuilder()
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* .append(field1, rhs.field1)
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* .append(field2, rhs.field2)
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* .appendb(field3, rhs.field3)
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* .toComparison();
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* }
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* </pre>
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* <p>
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* Alternatively, there is a method that uses reflection to determine
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* the fields to test. Because these fields are usually private, the method,
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* <code>reflectionCompare</code>, uses <code>Field.setAccessible</code> to change
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* the visibility of the fields. This will fail under a security manager,
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* unless the appropriate permissions are set. It is also slower than testing
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* explicitly.
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* <p>
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* A typical invocation for this method would look like:
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* <pre>
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* public int compareTo(Object o) {
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* return CompareToBuilder.reflectionCompare(this, obj);
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* }
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* </pre>
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* @author <a href="mailto:steve.downey@netfolio.com">Steve Downey</a>
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* @author <a href="mailto:scolebourne@joda.org">Stephen Colebourne</a>
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* @version $Id: CompareToBuilder.java,v 1.1 2002/09/15 10:25:22 scolebourne Exp $
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*/
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public class CompareToBuilder {
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/**
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* If the fields tested are equals.
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*/
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protected int comparison;
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/**
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* Constructor for CompareToBuilder.
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* Starts off assuming that the objects are equal.
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* @see java.lang.Object#Object()
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*/
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public CompareToBuilder() {
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super();
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comparison = 0;
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}
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//-------------------------------------------------------------------------
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/**
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* This method uses reflection to determine the ordering between two objects.
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* <p>
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* It uses Field.setAccessible to gain access to private fields. This means
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* that it will throw a security exception if run under a security manger, if
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* the permissions are not set up.
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* It is also not as efficient as testing explicitly.
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* Transient members will be not be tested, as they are likely derived
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* fields, and not part of the value of the object.
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* @param lhs - Left Hand Side
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* @param rhs - Right Hand Side
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* @return int - a negative integer, zero, or a positive integer as this
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* object is less than, equal to, or greater than the specified object.
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* @throws ClassCastException - if the specified object's type prevents it
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* from being compared to this Object.
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*/
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public static int reflectionCompare(Object lhs, Object rhs) {
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return reflectionCompare(lhs, rhs, false);
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}
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/**
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* This method uses reflection to determine if the two object are equal.
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* <p>
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* It uses Field.setAccessible to gain access to private fields. This means
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* that it will throw a security exception if run under a security manger, if
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* the permissions are not set up.
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* It is also not as efficient as testing explicitly.
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* If the TestTransients parameter is set to true, transient members will be
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* tested, otherwise they are ignored, as they are likely derived fields, and
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* not part of the value of the object.
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*
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* @param lhs - Left Hand Side
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* @param rhs - Right Hand Side
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* @param testTransients - whether to include transient fields
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* @return int - a negative integer, zero, or a positive integer as this
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* object is less than, equal to, or greater than the specified object.
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* @throws ClassCastException - if the specified object's type prevents it
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* from being compared to this Object.
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*/
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public static int reflectionCompare(Object lhs, Object rhs, boolean testTransients) {
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if (lhs == rhs) {
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return 0;
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}
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if (lhs == null || rhs == null) {
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throw new NullPointerException();
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}
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Class c1 = lhs.getClass();
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if (!c1.isInstance(rhs)) {
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throw new ClassCastException();
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}
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Field[] fields = c1.getDeclaredFields();
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Field.setAccessible(fields, true);
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CompareToBuilder compareToBuilder = new CompareToBuilder();
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for (int i = 0; i < fields.length && compareToBuilder.comparison == 0; ++i) {
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Field f = fields[i];
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if (testTransients || !Modifier.isTransient(f.getModifiers())) {
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try {
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compareToBuilder.append(f.get(lhs), f.get(rhs));
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} catch (IllegalAccessException e) {
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//this can't happen. Would get a Security exception instead
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//throw a runtime exception in case the impossible happens.
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throw new InternalError("Unexpected IllegalAccessException");
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}
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}
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}
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return compareToBuilder.toComparison();
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}
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//-------------------------------------------------------------------------
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/** Test if two <code>Object</code>s are equal using either the
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* <code>compareTo</code> method, or native comparison if the Objects are
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* actually arrays.
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* <p>
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* The objects must be <code>Comparable</code>. If they are not, the method
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* will throw a <code>ClassCastException</code>.
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* @param lhs - Left Hand Side
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* @param rhs - Right Hand Side
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* @return CompareToBuilder - used to chain calls.
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* @throws ClassCastException - if the specified object's type prevents it
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* from being compared to this Object.
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*/
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public CompareToBuilder append(Object lhs, Object rhs) {
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if (comparison != 0) {
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return this;
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}
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if (lhs == rhs) {
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return this;
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}
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if (lhs == null || rhs == null) {
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throw new NullPointerException();
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}
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Class lhsClass = lhs.getClass();
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if (!lhsClass.isArray()) {
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//the simple case, not an array, just test the element
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comparison = ((Comparable)lhs).compareTo(rhs);
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} else {
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//'Switch' on type of array, to dispatch to the correct handler
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// This handles multi dimensional arrays
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if (lhs instanceof long[]) {
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append((long[]) lhs, (long[]) rhs);
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} else if (lhs instanceof int[]) {
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append((int[]) lhs, (int[]) rhs);
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} else if (lhs instanceof short[]) {
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append((short[]) lhs, (short[]) rhs);
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} else if (lhs instanceof char[]) {
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append((char[]) lhs, (char[]) rhs);
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} else if (lhs instanceof byte[]) {
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append((byte[]) lhs, (byte[]) rhs);
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} else if (lhs instanceof double[]) {
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append((double[]) lhs, (double[]) rhs);
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} else if (lhs instanceof float[]) {
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append((float[]) lhs, (float[]) rhs);
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} else if (lhs instanceof boolean[]) {
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append((boolean[]) lhs, (boolean[]) rhs);
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} else {
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// Not an array of primitives
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append((Object[]) lhs, (Object[]) rhs);
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}
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}
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return this;
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}
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/**
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* Test if two <code>long</code>s are <, > or ==.
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* @param lhs - Left Hand Side
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* @param rhs - Right Hand Side
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* @return CompareToBuilder - used to chain calls.
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*/
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public CompareToBuilder append(long lhs, long rhs) {
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if (comparison != 0) {
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return this;
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}
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comparison = ((lhs < rhs) ? -1 : ((lhs > rhs) ? 1 : 0));
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return this;
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}
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/**
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* Test if two <code>int</code>s are <, > or ==.
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* @param lhs - Left Hand Side
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* @param rhs - Right Hand Side
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* @return CompareToBuilder - used to chain calls.
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*/
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public CompareToBuilder append(int lhs, int rhs) {
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if (comparison != 0) {
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return this;
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}
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comparison = ((lhs < rhs) ? -1 : ((lhs > rhs) ? 1 : 0));
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return this;
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}
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/**
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* Test if two <code>short</code>s are <, > or ==.
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* @param lhs - Left Hand Side
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* @param rhs - Right Hand Side
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* @return CompareToBuilder - used to chain calls.
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*/
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public CompareToBuilder append(short lhs, short rhs) {
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if (comparison != 0) {
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return this;
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}
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comparison = ((lhs < rhs) ? -1 : ((lhs > rhs) ? 1 : 0));
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return this;
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}
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/**
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* Test if two <code>char</code>s are <, > or ==.
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* @param lhs - Left Hand Side
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* @param rhs - Right Hand Side
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* @return CompareToBuilder - used to chain calls.
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*/
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public CompareToBuilder append(char lhs, char rhs) {
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if (comparison != 0) {
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return this;
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}
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comparison = ((lhs < rhs) ? -1 : ((lhs > rhs) ? 1 : 0));
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return this;
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}
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/**
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* Test if two <code>byte</code>s are <, > or ==.
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* @param lhs - Left Hand Side
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* @param rhs - Right Hand Side
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* @return CompareToBuilder - used to chain calls.
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*/
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public CompareToBuilder append(byte lhs, byte rhs) {
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if (comparison != 0) {
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return this;
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}
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comparison = ((lhs < rhs) ? -1 : ((lhs > rhs) ? 1 : 0));
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return this;
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}
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/**
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* Test if two <code>double</code>s are <, > or ==. This handles NaNs,
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* Infinties, and -0.0. It is compatible with the hash code generated by
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* <code>HashCodeBuilder</code>.
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* @param lhs - Left Hand Side
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* @param rhs - Right Hand Side
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* @return CompareToBuilder - used to chain calls.
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*/
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public CompareToBuilder append(double lhs, double rhs) {
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if (comparison != 0) {
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return this;
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}
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comparison = NumberUtils.compare(lhs, rhs);
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return this;
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}
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/**
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* Test if two <code>double</code>s are <, > or ==. This handles NaNs,
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* Infinties, and -0.0. It is compatible with the hash code generated by
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* <code>HashCodeBuilder</code>.
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* @param lhs - Left Hand Side
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* @param rhs - Right Hand Side
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* @return CompareToBuilder - used to chain calls.
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*/
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public CompareToBuilder append(float lhs, float rhs) {
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if (comparison != 0) {
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return this;
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}
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comparison = NumberUtils.compare(lhs, rhs);
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return this;
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}
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/**
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* Test if two <code>booleans</code>s are <, > or ==.
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* @param lhs - Left Hand Side
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* @param rhs - Right Hand Side
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* @return CompareToBuilder - used to chain calls.
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*/
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public CompareToBuilder append(boolean lhs, boolean rhs) {
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if (comparison != 0) {
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return this;
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}
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if (lhs == rhs) {
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return this;
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}
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if (lhs == false) {
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comparison = -1;
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} else {
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comparison = +1;
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}
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return this;
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}
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/**
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* Performs a deep comparison of two object arrays. This also will be
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* called for the top level of multi-dimensional, ragged, and multi-typed
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* arrays. If two arrays are of different lengths, and all elements of the
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* shorter array are equal to the elements in the longer array, the longer
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* array is the greater. This is dictionary, or lexical, ordering.
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* @param lhs - Left Hand Side
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* @param rhs - Right Hand Side
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* @return CompareToBuilder - used to chain calls.
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* @throws ClassCastException - if the specified object's type prevents it
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* from being compared to this Object.
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*/
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public CompareToBuilder append(Object[] lhs, Object[] rhs) {
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if (comparison != 0) {
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return this;
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}
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if (lhs == rhs) {
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return this;
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}
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if (lhs == null || rhs == null) {
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throw new NullPointerException();
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}
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int length = (lhs.length < rhs.length) ? lhs.length : rhs.length;
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for (int i = 0; i < length && comparison == 0; ++i) {
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Class lhsClass = lhs[i].getClass();
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if (!lhsClass.isInstance(rhs[i])) {
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throw new ClassCastException();
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}
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append(lhs[i], rhs[i]);
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}
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if (comparison == 0 && lhs.length != rhs.length) {
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comparison = (lhs.length < rhs.length) ? -1 : +1;
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}
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return this;
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}
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/**
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* Deep comparison of array of <code>long</code> Length and all values
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* are compared. The method append(long, long) is used.
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* @param lhs - Left Hand Side
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* @param rhs - Right Hand Side
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* @return CompareToBuilder - used to chain calls.
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*/
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public CompareToBuilder append(long[] lhs, long[] rhs) {
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if (comparison != 0) {
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return this;
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}
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if (lhs == rhs) {
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return this;
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}
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if (lhs == null || rhs == null) {
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throw new NullPointerException();
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}
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int length = (lhs.length < rhs.length) ? lhs.length : rhs.length;
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for (int i = 0; i < length && comparison == 0; ++i) {
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append(lhs[i], rhs[i]);
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}
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if (comparison == 0 && lhs.length != rhs.length) {
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comparison = (lhs.length < rhs.length) ? -1 : +1;
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}
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return this;
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}
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/**
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* Deep comparison of array of <code>int</code> Length and all values
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* are compared. The method append(int, int) is used.
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* @param lhs - Left Hand Side
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* @param rhs - Right Hand Side
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* @return CompareToBuilder - used to chain calls.
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*/
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public CompareToBuilder append(int[] lhs, int[] rhs) {
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if (comparison != 0) {
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return this;
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}
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if (lhs == rhs) {
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return this;
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}
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if (lhs == null || rhs == null) {
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throw new NullPointerException();
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}
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int length = (lhs.length < rhs.length) ? lhs.length : rhs.length;
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for (int i = 0; i < length && comparison == 0; ++i) {
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append(lhs[i], rhs[i]);
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}
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if (comparison == 0 && lhs.length != rhs.length) {
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comparison = (lhs.length < rhs.length) ? -1 : +1;
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}
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return this;
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}
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/**
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* Deep comparison of array of <code>short</code> Length and all values
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||||
* are compared. The method append(short, short) is used.
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* @param lhs - Left Hand Side
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* @param rhs - Right Hand Side
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||||
* @return CompareToBuilder - used to chain calls.
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*/
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public CompareToBuilder append(short[] lhs, short[] rhs) {
|
||||
if (comparison != 0) {
|
||||
return this;
|
||||
}
|
||||
if (lhs == rhs) {
|
||||
return this;
|
||||
}
|
||||
if (lhs == null || rhs == null) {
|
||||
throw new NullPointerException();
|
||||
}
|
||||
int length = (lhs.length < rhs.length) ? lhs.length : rhs.length;
|
||||
for (int i = 0; i < length && comparison == 0; ++i) {
|
||||
append(lhs[i], rhs[i]);
|
||||
}
|
||||
if (comparison == 0 && lhs.length != rhs.length) {
|
||||
comparison = (lhs.length < rhs.length) ? -1 : +1;
|
||||
}
|
||||
return this;
|
||||
}
|
||||
|
||||
/**
|
||||
* Deep comparison of array of <code>char</code> Length and all values
|
||||
* are compared. The method append(char, char) is used.
|
||||
* @param lhs - Left Hand Side
|
||||
* @param rhs - Right Hand Side
|
||||
* @return CompareToBuilder - used to chain calls.
|
||||
*/
|
||||
public CompareToBuilder append(char[] lhs, char[] rhs) {
|
||||
if (comparison != 0) {
|
||||
return this;
|
||||
}
|
||||
if (lhs == rhs) {
|
||||
return this;
|
||||
}
|
||||
if (lhs == null || rhs == null) {
|
||||
throw new NullPointerException();
|
||||
}
|
||||
int length = (lhs.length < rhs.length) ? lhs.length : rhs.length;
|
||||
for (int i = 0; i < length && comparison == 0; ++i) {
|
||||
append(lhs[i], rhs[i]);
|
||||
}
|
||||
if (comparison == 0 && lhs.length != rhs.length) {
|
||||
comparison = (lhs.length < rhs.length) ? -1 : +1;
|
||||
}
|
||||
return this;
|
||||
}
|
||||
|
||||
/**
|
||||
* Deep comparison of array of <code>byte</code> Length and all values
|
||||
* are compared. The method append(byte, byte) is used.
|
||||
* @param lhs - Left Hand Side
|
||||
* @param rhs - Right Hand Side
|
||||
* @return CompareToBuilder - used to chain calls.
|
||||
*/
|
||||
public CompareToBuilder append(byte[] lhs, byte[] rhs) {
|
||||
if (comparison != 0) {
|
||||
return this;
|
||||
}
|
||||
if (lhs == rhs) {
|
||||
return this;
|
||||
}
|
||||
if (lhs == null || rhs == null) {
|
||||
throw new NullPointerException();
|
||||
}
|
||||
int length = (lhs.length < rhs.length) ? lhs.length : rhs.length;
|
||||
for (int i = 0; i < length && comparison == 0; ++i) {
|
||||
append(lhs[i], rhs[i]);
|
||||
}
|
||||
if (comparison == 0 && lhs.length != rhs.length) {
|
||||
comparison = (lhs.length < rhs.length) ? -1 : +1;
|
||||
}
|
||||
return this;
|
||||
}
|
||||
|
||||
/**
|
||||
* Deep comparison of array of <code>double</code> Length and all values
|
||||
* are compared. The method append(double, double) is used.
|
||||
* @param lhs - Left Hand Side
|
||||
* @param rhs - Right Hand Side
|
||||
* @return CompareToBuilder - used to chain calls.
|
||||
*/
|
||||
public CompareToBuilder append(double[] lhs, double[] rhs) {
|
||||
if (comparison != 0) {
|
||||
return this;
|
||||
}
|
||||
if (lhs == rhs) {
|
||||
return this;
|
||||
}
|
||||
if (lhs == null || rhs == null) {
|
||||
throw new NullPointerException();
|
||||
}
|
||||
int length = (lhs.length < rhs.length) ? lhs.length : rhs.length;
|
||||
for (int i = 0; i < length && comparison == 0; ++i) {
|
||||
append(lhs[i], rhs[i]);
|
||||
}
|
||||
if (comparison == 0 && lhs.length != rhs.length) {
|
||||
comparison = (lhs.length < rhs.length) ? -1 : +1;
|
||||
}
|
||||
return this;
|
||||
}
|
||||
|
||||
/**
|
||||
* Deep comparison of array of <code>float</code> Length and all values
|
||||
* are compared. The method append(float, float) is used.
|
||||
* @param lhs - Left Hand Side
|
||||
* @param rhs - Right Hand Side
|
||||
* @return CompareToBuilder - used to chain calls.
|
||||
*/
|
||||
public CompareToBuilder append(float[] lhs, float[] rhs) {
|
||||
if (comparison != 0) {
|
||||
return this;
|
||||
}
|
||||
if (lhs == rhs) {
|
||||
return this;
|
||||
}
|
||||
if (lhs == null || rhs == null) {
|
||||
throw new NullPointerException();
|
||||
}
|
||||
int length = (lhs.length < rhs.length) ? lhs.length : rhs.length;
|
||||
for (int i = 0; i < length && comparison == 0; ++i) {
|
||||
append(lhs[i], rhs[i]);
|
||||
}
|
||||
if (comparison == 0 && lhs.length != rhs.length) {
|
||||
comparison = (lhs.length < rhs.length) ? -1 : +1;
|
||||
}
|
||||
return this;
|
||||
}
|
||||
|
||||
/**
|
||||
* Deep comparison of array of <code>boolean</code> Length and all values
|
||||
* are compared. The method append(boolean, boolean) is used.
|
||||
* @param lhs - Left Hand Side
|
||||
* @param rhs - Right Hand Side
|
||||
* @return CompareToBuilder - used to chain calls.
|
||||
*/
|
||||
public CompareToBuilder append(boolean[] lhs, boolean[] rhs) {
|
||||
if (comparison != 0) {
|
||||
return this;
|
||||
}
|
||||
if (lhs == rhs) {
|
||||
return this;
|
||||
}
|
||||
if (lhs == null || rhs == null) {
|
||||
throw new NullPointerException();
|
||||
}
|
||||
int length = (lhs.length < rhs.length) ? lhs.length : rhs.length;
|
||||
for (int i = 0; i < length && comparison == 0; ++i) {
|
||||
append(lhs[i], rhs[i]);
|
||||
}
|
||||
if (comparison == 0 && lhs.length != rhs.length) {
|
||||
comparison = (lhs.length < rhs.length) ? -1 : +1;
|
||||
}
|
||||
return this;
|
||||
}
|
||||
|
||||
/**
|
||||
* Return a negative integer if the object is less than, a positive
|
||||
* integer if the object is greater than, or 0 if the object is equal.
|
||||
*
|
||||
* @return int - a negative integer, zero, or a positive integer as this
|
||||
* object is less than, equal to, or greater than the specified object.
|
||||
*/
|
||||
public int toComparison() {
|
||||
return comparison;
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue