1 /* 2 * $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/pattern/UnionPattern.java,v 1.6 2002/05/20 08:34:10 jstrachan Exp $ 3 * $Revision: 1.6 $ 4 * $Date: 2002/05/20 08:34:10 $ 5 * 6 * ==================================================================== 7 * 8 * Copyright (C) 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 13 * are met: 14 * 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions, and the following disclaimer. 17 * 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions, and the disclaimer that follows 20 * these conditions in the documentation and/or other materials 21 * provided with the distribution. 22 * 23 * 3. The name "Jaxen" must not be used to endorse or promote products 24 * derived from this software without prior written permission. For 25 * written permission, please contact license@jaxen.org. 26 * 27 * 4. Products derived from this software may not be called "Jaxen", nor 28 * may "Jaxen" appear in their name, without prior written permission 29 * from the Jaxen Project Management (pm@jaxen.org). 30 * 31 * In addition, we request (but do not require) that you include in the 32 * end-user documentation provided with the redistribution and/or in the 33 * software itself an acknowledgement equivalent to the following: 34 * "This product includes software developed by the 35 * Jaxen Project (http://www.jaxen.org/)." 36 * Alternatively, the acknowledgment may be graphical using the logos 37 * available at http://www.jaxen.org/ 38 * 39 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED 40 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 41 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 42 * DISCLAIMED. IN NO EVENT SHALL THE Jaxen AUTHORS OR THE PROJECT 43 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 45 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 46 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 47 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 48 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 49 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 50 * SUCH DAMAGE. 51 * 52 * ==================================================================== 53 * This software consists of voluntary contributions made by many 54 * individuals on behalf of the Jaxen Project and was originally 55 * created by bob mcwhirter <bob@werken.com> and 56 * James Strachan <jstrachan@apache.org>. For more information on the 57 * Jaxen Project, please see <http://www.jaxen.org/>. 58 * 59 * $Id: UnionPattern.java,v 1.6 2002/05/20 08:34:10 jstrachan Exp $ 60 */ 61 62 package org.jaxen.pattern; 63 64 import org.jaxen.Context; 65 import org.jaxen.JaxenException; 66 67 /*** <p><code>UnionPattern</code> represents a union pattern.</p> 68 * 69 * @author <a href="mailto:jstrachan@apache.org">James Strachan</a> 70 * @version $Revision: 1.6 $ 71 */ 72 public class UnionPattern extends Pattern { 73 74 private Pattern lhs; 75 private Pattern rhs; 76 private short nodeType = ANY_NODE; 77 private String matchesNodeName = null; 78 79 80 public UnionPattern() 81 { 82 } 83 84 public UnionPattern(Pattern lhs, Pattern rhs) 85 { 86 this.lhs = lhs; 87 this.rhs = rhs; 88 init(); 89 } 90 91 92 public Pattern getLHS() 93 { 94 return lhs; 95 } 96 97 public void setLHS(Pattern lhs) 98 { 99 this.lhs = lhs; 100 init(); 101 } 102 103 public Pattern getRHS() 104 { 105 return rhs; 106 } 107 108 public void setRHS(Pattern rhs) 109 { 110 this.rhs = rhs; 111 init(); 112 } 113 114 115 // Pattern interface 116 //------------------------------------------------------------------------- 117 118 /*** @return true if the pattern matches the given node 119 */ 120 public boolean matches( Object node, Context context ) throws JaxenException 121 { 122 return lhs.matches( node, context ) || rhs.matches( node, context ); 123 } 124 125 public Pattern[] getUnionPatterns() 126 { 127 return new Pattern[] { lhs, rhs }; 128 } 129 130 131 public short getMatchType() 132 { 133 return nodeType; 134 } 135 136 137 public String getMatchesNodeName() 138 { 139 return matchesNodeName; 140 } 141 142 143 public Pattern simplify() 144 { 145 this.lhs = lhs.simplify(); 146 this.rhs = rhs.simplify(); 147 init(); 148 return this; 149 } 150 151 public String getText() 152 { 153 return lhs.getText() + " | " + rhs.getText(); 154 } 155 156 public String toString() 157 { 158 return super.toString() + "[ lhs: " + lhs + " rhs: " + rhs + " ]"; 159 } 160 161 // Implementation methods 162 //------------------------------------------------------------------------- 163 private void init() 164 { 165 short type1 = lhs.getMatchType(); 166 short type2 = rhs.getMatchType(); 167 this.nodeType = ( type1 == type2 ) ? type1 : ANY_NODE; 168 169 String name1 = lhs.getMatchesNodeName(); 170 String name2 = rhs.getMatchesNodeName(); 171 172 this.matchesNodeName = null; 173 if ( name1 != null && name2 != null && name1.equals( name2 ) ) 174 { 175 this.matchesNodeName = name1; 176 } 177 } 178 }