001 /*
002 $Id: Tuple.java,v 1.3 2003/11/04 12:00:47 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 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.AbstractList;
049 import java.util.List;
050
051 import org.codehaus.groovy.runtime.InvokerHelper;
052
053 /**
054 * Represents a list of Integer objects from a specified int up to but not including
055 * a given and to.
056 *
057 * @author <a href="mailto:james@coredevelopers.net">James Strachan</a>
058 * @version $Revision: 1.3 $
059 */
060 public class Tuple extends AbstractList {
061
062 private Object[] contents;
063 private int hashCode;
064
065 public Tuple(Object[] contents) {
066 this.contents = contents;
067 }
068
069 public Object get(int index) {
070 return contents[index];
071 }
072
073 public int size() {
074 return contents.length;
075 }
076
077 public boolean equals(Object that) {
078 if (that instanceof Tuple) {
079 return equals((Tuple) that);
080 }
081 return false;
082 }
083
084 public boolean equals(Tuple that) {
085 if (contents.length == that.contents.length) {
086 for (int i = 0; i < contents.length; i++) {
087 if (! InvokerHelper.compareEqual(this.contents[i], that.contents[i])) {
088 return false;
089 }
090 }
091 return true;
092 }
093 return false;
094 }
095
096
097 public int hashCode() {
098 if (hashCode == 0) {
099 for (int i = 0; i < contents.length; i++ ) {
100 Object value = contents[i];
101 int hash = (value != null) ? value.hashCode() : 0xbabe;
102 hashCode ^= hash;
103 }
104 if (hashCode == 0) {
105 hashCode = 0xbabe;
106 }
107 }
108 return hashCode;
109 }
110
111 public List subList(int fromIndex, int toIndex) {
112 int size = toIndex - fromIndex;
113 Object[] newContent = new Object[size];
114 System.arraycopy(contents, fromIndex, newContent, 0, size);
115 return new Tuple(newContent);
116 }
117 }