001 /*
002 $Id: SpreadMap.java,v 1.1 2005/05/11 01:17:38 phk 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 from this Software without prior written
021 permission of The Codehaus. For written permission,
022 please contact info@codehaus.org.
023
024 4. Products derived from 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.lang;
047
048 import java.util.HashMap;
049 import java.util.Map;
050 import java.util.Iterator;
051
052 import org.codehaus.groovy.runtime.InvokerHelper;
053
054 /**
055 * Represents a spreadable map which extends java.util.HashMap.
056 *
057 * @author Pilho Kim
058 * @version $Revision: 1.1 $
059 */
060 public class SpreadMap extends HashMap {
061
062 private Map mapData;
063 private int hashCode;
064
065 public SpreadMap(Object[] values) {
066 mapData = new HashMap(values.length / 2);
067 int i = 0;
068 while (i < values.length) {
069 /// System.out.println(" ... i = " + i);
070 mapData.put(values[i++], values[i++]);
071 }
072 /// System.out.println(" >>> i = " + i);
073 }
074
075 public SpreadMap(Map map) {
076 this.mapData = map;
077 }
078
079 public Object get(Object obj) {
080 return mapData.get(obj);
081 }
082
083 public Object put(Object key, Object value) {
084 throw new RuntimeException("SpreadMap: " + this + " is an immutable map, and so ("
085 + key + ": " + value + ") cannot be added.");
086 }
087
088 public Object remove(Object key) {
089 throw new RuntimeException("SpreadMap: " + this + " is an immutable map, and so the key ("
090 + key + ") cannot be deleteded.");
091 }
092
093 public void putAll(Map t) {
094 throw new RuntimeException("SpreadMap: " + this + " is an immutable map, and so the map ("
095 + t + ") cannot be put in this spreadMap.");
096 }
097
098 public int size() {
099 return mapData.keySet().size();
100 }
101
102 public boolean equals(Object that) {
103 if (that instanceof SpreadMap) {
104 return equals((SpreadMap) that);
105 }
106 return false;
107 }
108
109 public boolean equals(SpreadMap that) {
110 if (this == null && that == null)
111 return true;
112 else if (this != null && that == null)
113 return false;
114 else if (this == null && that != null)
115 return false;
116
117 if (size() == that.size()) {
118 SpreadMap other = (SpreadMap) that;
119 Iterator iter = mapData.keySet().iterator();
120 for (; iter.hasNext(); ) {
121 Object key = iter.next();
122 if (! InvokerHelper.compareEqual(get(key), other.get(key)) ) {
123 return false;
124 }
125 }
126 return true;
127 }
128 return false;
129 }
130
131
132 public int hashCode() {
133 if (hashCode == 0) {
134 Iterator iter = mapData.keySet().iterator();
135 for (; iter.hasNext(); ) {
136 Object key = iter.next();
137 int hash = (key != null) ? key.hashCode() : 0xbabe;
138 hashCode ^= hash;
139 }
140 }
141 return hashCode;
142 }
143 }