001: /*
002: $Id: SpreadMap.java 4098 2006-10-10 16:09:48Z blackdrag $
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.typehandling.DefaultTypeTransformation;
053:
054: /**
055: * Represents a spreadable map which extends java.util.HashMap.
056: *
057: * @author Pilho Kim
058: * @version $Revision: 4098 $
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: mapData.put(values[i++], values[i++]);
070: }
071: }
072:
073: public SpreadMap(Map map) {
074: this .mapData = map;
075: }
076:
077: public Object get(Object obj) {
078: return mapData.get(obj);
079: }
080:
081: public Object put(Object key, Object value) {
082: throw new RuntimeException("SpreadMap: " + this
083: + " is an immutable map, and so (" + key + ": " + value
084: + ") cannot be added.");
085: }
086:
087: public Object remove(Object key) {
088: throw new RuntimeException("SpreadMap: " + this
089: + " is an immutable map, and so the key (" + key
090: + ") cannot be deleteded.");
091: }
092:
093: public void putAll(Map t) {
094: throw new RuntimeException("SpreadMap: " + this
095: + " is an immutable map, and so the map (" + t
096: + ") cannot be put in this spreadMap.");
097: }
098:
099: public int size() {
100: return mapData.keySet().size();
101: }
102:
103: public boolean equals(Object that) {
104: if (that instanceof SpreadMap) {
105: return equals((SpreadMap) that);
106: }
107: return false;
108: }
109:
110: public boolean equals(SpreadMap that) {
111: if (that == null)
112: return false;
113:
114: if (size() == that.size()) {
115: SpreadMap other = (SpreadMap) that;
116: Iterator iter = mapData.keySet().iterator();
117: for (; iter.hasNext();) {
118: Object key = iter.next();
119: if (!DefaultTypeTransformation.compareEqual(get(key),
120: other.get(key))) {
121: return false;
122: }
123: }
124: return true;
125: }
126: return false;
127: }
128:
129: public int hashCode() {
130: if (hashCode == 0) {
131: Iterator iter = mapData.keySet().iterator();
132: for (; iter.hasNext();) {
133: Object key = iter.next();
134: int hash = (key != null) ? key.hashCode() : 0xbabe;
135: hashCode ^= hash;
136: }
137: }
138: return hashCode;
139: }
140:
141: /**
142: * Returns the string expression of <code>this</code>.
143: *
144: * @return the string expression of <code>this</code>
145: */
146: public String toString() {
147: if (mapData.isEmpty()) {
148: return "*:[:]";
149: }
150: StringBuffer buff = new StringBuffer("*:[");
151: Iterator iter = mapData.keySet().iterator();
152: for (; iter.hasNext();) {
153: Object key = iter.next();
154: buff.append(key + ":" + mapData.get(key));
155: if (iter.hasNext())
156: buff.append(", ");
157: }
158: buff.append("]");
159: return buff.toString();
160: }
161: }
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