KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > org > jaxen > pattern > UnionPattern


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 JavaDoc 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 JavaDoc 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 JavaDoc 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 JavaDoc getText()
152     {
153         return lhs.getText() + " | " + rhs.getText();
154     }
155         
156     public String JavaDoc 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 JavaDoc name1 = lhs.getMatchesNodeName();
170         String JavaDoc 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 }
179
Popular Tags