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    }