001: /* ====================================================================
002: * Trove - Copyright (c) 1997-2000 Walt Disney Internet Group
003: * ====================================================================
004: * The Tea Software License, Version 1.1
005: *
006: * Copyright (c) 2000 Walt Disney Internet Group. All rights reserved.
007: *
008: * Redistribution and use in source and binary forms, with or without
009: * modification, are permitted provided that the following conditions
010: * are met:
011: *
012: * 1. Redistributions of source code must retain the above copyright
013: * notice, this list of conditions and the following disclaimer.
014: *
015: * 2. Redistributions in binary form must reproduce the above copyright
016: * notice, this list of conditions and the following disclaimer in
017: * the documentation and/or other materials provided with the
018: * distribution.
019: *
020: * 3. The end-user documentation included with the redistribution,
021: * if any, must include the following acknowledgment:
022: * "This product includes software developed by the
023: * Walt Disney Internet Group (http://opensource.go.com/)."
024: * Alternately, this acknowledgment may appear in the software itself,
025: * if and wherever such third-party acknowledgments normally appear.
026: *
027: * 4. The names "Tea", "TeaServlet", "Kettle", "Trove" and "BeanDoc" must
028: * not be used to endorse or promote products derived from this
029: * software without prior written permission. For written
030: * permission, please contact opensource@dig.com.
031: *
032: * 5. Products derived from this software may not be called "Tea",
033: * "TeaServlet", "Kettle" or "Trove", nor may "Tea", "TeaServlet",
034: * "Kettle", "Trove" or "BeanDoc" appear in their name, without prior
035: * written permission of the Walt Disney Internet Group.
036: *
037: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
038: * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
039: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
040: * DISCLAIMED. IN NO EVENT SHALL THE WALT DISNEY INTERNET GROUP OR ITS
041: * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
042: * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
043: * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
044: * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
045: * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
046: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
047: * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
048: * ====================================================================
049: *
050: * For more information about Tea, please see http://opensource.go.com/.
051: */
052:
053: package com.go.trove.util;
054:
055: import java.util.*;
056:
057: /******************************************************************************
058: * Abstract Map.Entry implementation that makes it easier to define new Map
059: * entries.
060: *
061: * parametrized for GJ by Stefan Reich (doc@drjava.de)
062: *
063: * @author Brian S O'Neill
064: * @version
065: * <!--$$Revision: 1.2 $-->, <!--$$JustDate:--> 1/23/01 <!-- $-->
066: */
067: public abstract class AbstractMapEntry<A, B> implements Map.Entry<A, B> {
068: /**
069: * Always throws UnsupportedOperationException.
070: */
071: public B setValue(B value) {
072: throw new UnsupportedOperationException();
073: }
074:
075: public boolean equals(Object obj) {
076: if (!(obj instanceof Map.Entry)) {
077: return false;
078: }
079:
080: Map.Entry e = (Map.Entry) obj;
081:
082: A key = getKey();
083: B value = getValue();
084:
085: return (key == null ? e.getKey() == null : key.equals(e
086: .getKey()))
087: && (value == null ? e.getValue() == null : value
088: .equals(e.getValue()));
089: }
090:
091: public int hashCode() {
092: A key = getKey();
093: B value = getValue();
094:
095: return (key == null ? 0 : key.hashCode())
096: ^ (value == null ? 0 : value.hashCode());
097: }
098:
099: public String toString() {
100: return String.valueOf(getKey()) + '='
101: + String.valueOf(getValue());
102: }
103: }
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