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 }