Moving IllegalClassException to backcompat
git-svn-id: https://svn.apache.org/repos/asf/commons/proper/lang/trunk@796067 13f79535-47bb-0310-9956-ffa450edef68
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/*
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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.lang;
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/**
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* <p>Thrown when an object is an instance of an unexpected type (a class or interface).
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* This exception supplements the standard <code>IllegalArgumentException</code>
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* by providing a more semantically rich description of the problem.</p>
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*
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* <p><code>IllegalClassException</code> represents the case where a method takes
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* in a genericly typed parameter like Object (typically because it has to due to some
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* other interface it implements), but this implementation only actually accepts a specific
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* type, for example String. This exception would be used in place of
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* <code>IllegalArgumentException</code>, yet it still extends it.</p>
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*
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* <pre>
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* public void foo(Object obj) {
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* if (obj instanceof String == false) {
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* throw new IllegalClassException(String.class, obj);
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* }
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* // do something with the string
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* }
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* </pre>
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*
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* @author Matthew Hawthorne
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* @author Gary Gregory
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* @author Stephen Colebourne
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* @since 2.0
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* @version $Id$
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*/
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public class IllegalClassException extends IllegalArgumentException {
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/**
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* Required for serialization support.
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*
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* @see java.io.Serializable
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*/
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private static final long serialVersionUID = 8063272569377254819L;
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/**
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* <p>Instantiates with the expected type, and actual object.</p>
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*
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* @param expected the expected type
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* @param actual the actual object
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* @since 2.1
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*/
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public IllegalClassException(Class<?> expected, Object actual) {
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super(
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"Expected: "
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+ safeGetClassName(expected)
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+ ", actual: "
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+ (actual == null ? "null" : actual.getClass().getName()));
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}
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/**
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* <p>Instantiates with the expected and actual types.</p>
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*
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* @param expected the expected type
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* @param actual the actual type
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*/
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public IllegalClassException(Class<?> expected, Class<?> actual) {
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super(
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"Expected: "
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+ safeGetClassName(expected)
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+ ", actual: "
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+ safeGetClassName(actual));
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}
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/**
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* <p>Instantiates with the specified message.</p>
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*
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* @param message the exception message
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*/
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public IllegalClassException(String message) {
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super(message);
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}
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/**
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* <p>Returns the class name or <code>null</code> if the class is
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* <code>null</code>.</p>
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*
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* @param cls a <code>Class</code>
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* @return the name of <code>cls</code>, or <code>null</code> if if <code>cls</code> is <code>null</code>.
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*/
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private static final String safeGetClassName(Class<?> cls) {
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return cls == null ? null : cls.getName();
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}
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}
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