1 /*
2 * $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/pattern/UnionPattern.java,v 1.7 2005/06/28 13:44:44 elharo Exp $
3 * $Revision: 1.7 $
4 * $Date: 2005/06/28 13:44:44 $
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 1.7 2005/06/28 13:44:44 elharo 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: 1.7 $
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 }