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Java > Open Source Codes > org > jaxen > expr > DefaultPathExpr


1 /*
2  * $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/expr/DefaultPathExpr.java,v 1.11 2005/05/16 10:48:12 elharo Exp $
3  * $Revision: 1.11 $
4  * $Date: 2005/05/16 10:48:12 $
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: DefaultPathExpr.java,v 1.11 2005/05/16 10:48:12 elharo Exp $
60  */

61
62 package org.jaxen.expr;
63
64
65 import org.jaxen.Context;
66 import org.jaxen.JaxenException;
67
68
69 class DefaultPathExpr extends DefaultExpr implements PathExpr {
70
71     private Expr filterExpr;
72     private LocationPath locationPath;
73
74     DefaultPathExpr(Expr filterExpr,
75                            LocationPath locationPath) {
76         this.filterExpr = filterExpr;
77         this.locationPath = locationPath;
78     }
79
80     public Expr getFilterExpr() {
81         return this.filterExpr;
82     }
83
84
85     public void setFilterExpr(Expr filterExpr) {
86         this.filterExpr = filterExpr;
87     }
88
89
90     public LocationPath getLocationPath() {
91         return this.locationPath;
92     }
93
94
95     public String JavaDoc toString() {
96         if (getLocationPath() != null) {
97             return "[(DefaultPathExpr): " + getFilterExpr() + ", " + getLocationPath() + "]";
98         }
99
100         return "[(DefaultPathExpr): " + getFilterExpr() + "]";
101     }
102
103
104     public String JavaDoc getText() {
105         StringBuffer JavaDoc buf = new StringBuffer JavaDoc();
106
107         if (getFilterExpr() != null) {
108             buf.append(getFilterExpr().getText());
109         }
110
111         if (getLocationPath() != null) {
112             buf.append(getLocationPath().getText());
113         }
114
115         return buf.toString();
116     }
117
118
119     public Expr simplify() {
120         if (getFilterExpr() != null) {
121             setFilterExpr(getFilterExpr().simplify());
122         }
123
124         if (getLocationPath() != null) {
125             getLocationPath().simplify();
126         }
127
128         if (getFilterExpr() == null && getLocationPath() == null) {
129             return null;
130         }
131
132
133         if (getLocationPath() == null) {
134             return getFilterExpr();
135         }
136
137         if (getFilterExpr() == null) {
138             return getLocationPath();
139         }
140
141         return this;
142     }
143
144     public Object JavaDoc evaluate(Context context) throws JaxenException {
145         Object JavaDoc results = null;
146         Context pathContext = null;
147         if (getFilterExpr() != null) {
148             results = getFilterExpr().evaluate(context);
149             pathContext = new Context(context.getContextSupport());
150             pathContext.setNodeSet(convertToList(results));
151         }
152         if (getLocationPath() != null) {
153             return getLocationPath().evaluate(pathContext);
154         }
155         return results;
156     }
157
158     public void accept(Visitor visitor) {
159         visitor.visit(this);
160     }
161 }
162
163
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