1 /* 2 $Id: Tuple.java,v 1.3 2003/11/04 12:00:47 jstrachan Exp $ 3 4 Copyright 2003 (C) James Strachan and Bob Mcwhirter. All Rights Reserved. 5 6 Redistribution and use of this software and associated documentation 7 ("Software"), with or without modification, are permitted provided 8 that the following conditions are met: 9 10 1. Redistributions of source code must retain copyright 11 statements and notices. Redistributions must also contain a 12 copy of this document. 13 14 2. Redistributions in binary form must reproduce the 15 above copyright notice, this list of conditions and the 16 following disclaimer in the documentation and/or other 17 materials provided with the distribution. 18 19 3. The name "groovy" must not be used to endorse or promote 20 products derived from this Software without prior written 21 permission of The Codehaus. For written permission, 22 please contact info@codehaus.org. 23 24 4. Products derived from this Software may not be called "groovy" 25 nor may "groovy" appear in their names without prior written 26 permission of The Codehaus. "groovy" is a registered 27 trademark of The Codehaus. 28 29 5. Due credit should be given to The Codehaus - 30 http://groovy.codehaus.org/ 31 32 THIS SOFTWARE IS PROVIDED BY THE CODEHAUS AND CONTRIBUTORS 33 ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT 34 NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 35 FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 36 THE CODEHAUS OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 37 INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 38 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 39 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 40 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 41 STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 42 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 43 OF THE POSSIBILITY OF SUCH DAMAGE. 44 45 */ 46 package groovy.lang; 47 48 import java.util.AbstractList; 49 import java.util.List; 50 51 import org.codehaus.groovy.runtime.InvokerHelper; 52 53 /*** 54 * Represents a list of Integer objects from a specified int up to but not including 55 * a given and to. 56 * 57 * @author <a href="mailto:james@coredevelopers.net">James Strachan</a> 58 * @version $Revision: 1.3 $ 59 */ 60 public class Tuple extends AbstractList { 61 62 private Object[] contents; 63 private int hashCode; 64 65 public Tuple(Object[] contents) { 66 this.contents = contents; 67 } 68 69 public Object get(int index) { 70 return contents[index]; 71 } 72 73 public int size() { 74 return contents.length; 75 } 76 77 public boolean equals(Object that) { 78 if (that instanceof Tuple) { 79 return equals((Tuple) that); 80 } 81 return false; 82 } 83 84 public boolean equals(Tuple that) { 85 if (contents.length == that.contents.length) { 86 for (int i = 0; i < contents.length; i++) { 87 if (! InvokerHelper.compareEqual(this.contents[i], that.contents[i])) { 88 return false; 89 } 90 } 91 return true; 92 } 93 return false; 94 } 95 96 97 public int hashCode() { 98 if (hashCode == 0) { 99 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 }