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git-svn-id: http://svn.igniterealtime.org/svn/repos/smack/trunk@6213 b35dd754-fafc-0310-a699-88a17e54d16e
89 lines
2.9 KiB
Java
89 lines
2.9 KiB
Java
// GenericsNote: Converted.
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/*
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* Copyright 2003-2004 The Apache Software Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* 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.jivesoftware.smack.util.collections;
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import java.util.Map;
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/**
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* Abstract Pair class to assist with creating correct Map Entry implementations.
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*
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* @author James Strachan
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* @author Michael A. Smith
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* @author Neil O'Toole
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* @author Matt Hall, John Watkinson, Stephen Colebourne
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* @version $Revision: 1.1 $ $Date: 2005/10/11 17:05:32 $
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* @since Commons Collections 3.0
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*/
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public abstract class AbstractMapEntry <K,V> extends AbstractKeyValue<K, V> implements Map.Entry<K, V> {
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/**
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* Constructs a new entry with the given key and given value.
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*
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* @param key the key for the entry, may be null
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* @param value the value for the entry, may be null
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*/
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protected AbstractMapEntry(K key, V value) {
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super(key, value);
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}
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// Map.Entry interface
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//-------------------------------------------------------------------------
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/**
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* Sets the value stored in this Map Entry.
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* <p/>
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* This Map Entry is not connected to a Map, so only the local data is changed.
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*
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* @param value the new value
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* @return the previous value
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*/
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public V setValue(V value) {
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V answer = this.value;
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this.value = value;
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return answer;
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}
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/**
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* Compares this Map Entry with another Map Entry.
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* <p/>
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* Implemented per API documentation of {@link java.util.Map.Entry#equals(Object)}
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*
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* @param obj the object to compare to
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* @return true if equal key and value
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*/
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public boolean equals(Object obj) {
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if (obj == this) {
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return true;
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}
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if (obj instanceof Map.Entry == false) {
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return false;
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}
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Map.Entry other = (Map.Entry) obj;
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return (getKey() == null ? other.getKey() == null : getKey().equals(other.getKey())) && (getValue() == null ? other.getValue() == null : getValue().equals(other.getValue()));
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}
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/**
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* Gets a hashCode compatible with the equals method.
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* <p/>
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* Implemented per API documentation of {@link java.util.Map.Entry#hashCode()}
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*
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* @return a suitable hash code
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*/
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public int hashCode() {
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return (getKey() == null ? 0 : getKey().hashCode()) ^ (getValue() == null ? 0 : getValue().hashCode());
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}
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}
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