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Commons Collections example source code file (UnmodifiableMapEntry.java)

This example Commons Collections source code file (UnmodifiableMapEntry.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

abstractmapentry, abstractmapentry, keyvalue, object, object, unmodifiable, unmodifiablemapentry, unmodifiablemapentry, unsupportedoperationexception, unsupportedoperationexception, util

The Commons Collections UnmodifiableMapEntry.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;
import org.apache.commons.collections.Unmodifiable;

/**
 * A {@link java.util.Map.Entry Map.Entry} that throws
 * UnsupportedOperationException when <code>setValue is called.
 *
 * @since Commons Collections 3.0
 * @version $Revision: 646777 $ $Date: 2008-04-10 13:33:15 +0100 (Thu, 10 Apr 2008) $
 * 
 * @author Stephen Colebourne
 */
public final class UnmodifiableMapEntry extends AbstractMapEntry implements Unmodifiable {

    /**
     * Constructs a new entry with the specified key and given value.
     *
     * @param key  the key for the entry, may be null
     * @param value  the value for the entry, may be null
     */
    public UnmodifiableMapEntry(final Object key, final Object value) {
        super(key, value);
    }

    /**
     * Constructs a new entry from the specified <code>KeyValue.
     *
     * @param pair  the pair to copy, must not be null
     * @throws NullPointerException if the entry is null
     */
    public UnmodifiableMapEntry(final KeyValue pair) {
        super(pair.getKey(), pair.getValue());
    }

    /**
     * Constructs a new entry from the specified <code>Map.Entry.
     *
     * @param entry  the entry to copy, must not be null
     * @throws NullPointerException if the entry is null
     */
    public UnmodifiableMapEntry(final Map.Entry entry) {
        super(entry.getKey(), entry.getValue());
    }

    /**
     * Throws UnsupportedOperationException.
     * 
     * @param value  the new value
     * @return the previous value
     * @throws UnsupportedOperationException always
     */
    public Object setValue(Object value) {
        throw new UnsupportedOperationException("setValue() is not supported");
    }

}

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