1 /* 2 * $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/pattern/UnionPattern.java,v 1.8 2006/02/05 21:47:42 elharo Exp $ 3 * $Revision: 1.8 $ 4 * $Date: 2006/02/05 21:47:42 $ 5 * 6 * ==================================================================== 7 * 8 * Copyright 2000-2002 bob mcwhirter & James Strachan. 9 * All rights reserved. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions are 13 * met: 14 * 15 * * Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 18 * * Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 22 * * Neither the name of the Jaxen Project nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS 27 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A 29 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER 30 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 31 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 32 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 33 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 34 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 35 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 36 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 37 * 38 * ==================================================================== 39 * This software consists of voluntary contributions made by many 40 * individuals on behalf of the Jaxen Project and was originally 41 * created by bob mcwhirter <bob@werken.com> and 42 * James Strachan <jstrachan@apache.org>. For more information on the 43 * Jaxen Project, please see <http://www.jaxen.org/>. 44 * 45 * $Id: UnionPattern.java,v 1.8 2006/02/05 21:47:42 elharo Exp $ 46 */ 47 48 package org.jaxen.pattern; 49 50 import org.jaxen.Context; 51 import org.jaxen.JaxenException; 52 53 /*** <p><code>UnionPattern</code> represents a union pattern.</p> 54 * 55 * @author <a href="mailto:jstrachan@apache.org">James Strachan</a> 56 * @version $Revision: 1.8 $ 57 */ 58 public class UnionPattern extends Pattern { 59 60 private Pattern lhs; 61 private Pattern rhs; 62 private short nodeType = ANY_NODE; 63 private String matchesNodeName = null; 64 65 66 public UnionPattern() 67 { 68 } 69 70 public UnionPattern(Pattern lhs, Pattern rhs) 71 { 72 this.lhs = lhs; 73 this.rhs = rhs; 74 init(); 75 } 76 77 78 public Pattern getLHS() 79 { 80 return lhs; 81 } 82 83 public void setLHS(Pattern lhs) 84 { 85 this.lhs = lhs; 86 init(); 87 } 88 89 public Pattern getRHS() 90 { 91 return rhs; 92 } 93 94 public void setRHS(Pattern rhs) 95 { 96 this.rhs = rhs; 97 init(); 98 } 99 100 101 // Pattern interface 102 //------------------------------------------------------------------------- 103 104 /*** @return true if the pattern matches the given node 105 */ 106 public boolean matches( Object node, Context context ) throws JaxenException 107 { 108 return lhs.matches( node, context ) || rhs.matches( node, context ); 109 } 110 111 public Pattern[] getUnionPatterns() 112 { 113 return new Pattern[] { lhs, rhs }; 114 } 115 116 117 public short getMatchType() 118 { 119 return nodeType; 120 } 121 122 123 public String getMatchesNodeName() 124 { 125 return matchesNodeName; 126 } 127 128 129 public Pattern simplify() 130 { 131 this.lhs = lhs.simplify(); 132 this.rhs = rhs.simplify(); 133 init(); 134 return this; 135 } 136 137 public String getText() 138 { 139 return lhs.getText() + " | " + rhs.getText(); 140 } 141 142 public String toString() 143 { 144 return super.toString() + "[ lhs: " + lhs + " rhs: " + rhs + " ]"; 145 } 146 147 // Implementation methods 148 //------------------------------------------------------------------------- 149 private void init() 150 { 151 short type1 = lhs.getMatchType(); 152 short type2 = rhs.getMatchType(); 153 this.nodeType = ( type1 == type2 ) ? type1 : ANY_NODE; 154 155 String name1 = lhs.getMatchesNodeName(); 156 String name2 = rhs.getMatchesNodeName(); 157 158 this.matchesNodeName = null; 159 if ( name1 != null && name2 != null && name1.equals( name2 ) ) 160 { 161 this.matchesNodeName = name1; 162 } 163 } 164 }