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Commons Collections example source code file (AbstractMapEntryDecorator.java)

This example Commons Collections source code file (AbstractMapEntryDecorator.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Commons Collections tags/keywords

abstractmapentrydecorator, entry, entry, illegalargumentexception, keyvalue, keyvalue, map, map, object, object, string, util

The Commons Collections AbstractMapEntryDecorator.java source code

 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *      http://www.apache.org/licenses/LICENSE-2.0
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
package org.apache.commons.collections.keyvalue;

import java.util.Map;

import org.apache.commons.collections.KeyValue;

 * Provides a base decorator that allows additional functionality to be
 * added to a {@link java.util.Map.Entry Map.Entry}.
 * @since Commons Collections 3.0
 * @version $Revision: 646777 $ $Date: 2008-04-10 13:33:15 +0100 (Thu, 10 Apr 2008) $
 * @author Stephen Colebourne
public abstract class AbstractMapEntryDecorator implements Map.Entry, KeyValue {
    /** The <code>Map.Entry to decorate */
    protected final Map.Entry entry;

     * Constructor that wraps (not copies).
     * @param entry  the <code>Map.Entry to decorate, must not be null
     * @throws IllegalArgumentException if the collection is null
    public AbstractMapEntryDecorator(Map.Entry entry) {
        if (entry == null) {
            throw new IllegalArgumentException("Map Entry must not be null");
        this.entry = entry;

     * Gets the map being decorated.
     * @return the decorated map
    protected Map.Entry getMapEntry() {
        return entry;

    public Object getKey() {
        return entry.getKey();

    public Object getValue() {
        return entry.getValue();

    public Object setValue(Object object) {
        return entry.setValue(object);
    public boolean equals(Object object) {
        if (object == this) {
            return true;
        return entry.equals(object);

    public int hashCode() {
        return entry.hashCode();

    public String toString() {
        return entry.toString();


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