Source Code Cross Referenced for AbstractMapEntry.java in  » Database-ORM » smyle » com » go » trove » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database ORM » smyle » com.go.trove.util 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


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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