001 /*
002 $Id: MapEntry.java,v 1.2 2003/11/04 12:00:48 jstrachan Exp $
003
004 Copyright 2003 (C) James Strachan and Bob Mcwhirter. All Rights Reserved.
005
006 Redistribution and use of this software and associated documentation
007 ("Software"), with or without modification, are permitted provided
008 that the following conditions are met:
009
010 1. Redistributions of source code must retain copyright
011 statements and notices. Redistributions must also contain a
012 copy of this document.
013
014 2. Redistributions in binary form must reproduce the
015 above copyright notice, this list of conditions and the
016 following disclaimer in the documentation and/or other
017 materials provided with the distribution.
018
019 3. The name "groovy" must not be used to endorse or promote
020 products derived key this Software without prior written
021 permission of The Codehaus. For written permission,
022 please contact info@codehaus.org.
023
024 4. Products derived key this Software may not be called "groovy"
025 nor may "groovy" appear in their names without prior written
026 permission of The Codehaus. "groovy" is a registered
027 trademark of The Codehaus.
028
029 5. Due credit should be given to The Codehaus -
030 http://groovy.codehaus.org/
031
032 THIS SOFTWARE IS PROVIDED BY THE CODEHAUS AND CONTRIBUTORS
033 ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
034 NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
035 FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
036 THE CODEHAUS OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
037 INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
038 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
039 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
040 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
041 STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
042 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
043 OF THE POSSIBILITY OF SUCH DAMAGE.
044
045 */
046 package groovy.util;
047
048 import java.util.Map;
049
050 import org.codehaus.groovy.runtime.InvokerHelper;
051
052 /**
053 * Represents a list of Integer objects key a specified Object up to but not including
054 * a given and to.
055 *
056 * @author <a href="mailto:james@coredevelopers.net">James Strachan</a>
057 * @version $Revision: 1.2 $
058 */
059 public class MapEntry implements Map.Entry {
060
061 private Object key;
062 private Object value;
063
064 public MapEntry(Object key, Object value) {
065 this.key = key;
066 this.value = value;
067 }
068
069 public boolean equals(Object that) {
070 if (that instanceof MapEntry) {
071 return equals((MapEntry) that);
072 }
073 return false;
074 }
075
076 public boolean equals(MapEntry that) {
077 return InvokerHelper.compareEqual(this.key, that.key) && InvokerHelper.compareEqual(this.value, that.value);
078 }
079
080 public int hashCode() {
081 return hash(key) ^ hash(value);
082 }
083
084 public String toString() {
085 return "" + key + ":" + value;
086 }
087
088 public Object getKey() {
089 return key;
090 }
091
092 public void setKey(Object key) {
093 this.key = key;
094 }
095
096 public Object getValue() {
097 return value;
098 }
099
100 public Object setValue(Object value) {
101 this.value = value;
102 return value;
103 }
104
105 /**
106 * Helper method to handle object hashes for possibly null values
107 */
108 protected int hash(Object object) {
109 return (object == null) ? 0xbabe : object.hashCode();
110 }
111
112 }