1 /*
2 * $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/expr/DefaultFilterExpr.java,v 1.16 2005/09/06 13:41:00 elharo Exp $
3 * $Revision: 1.16 $
4 * $Date: 2005/09/06 13:41:00 $
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: DefaultFilterExpr.java,v 1.16 2005/09/06 13:41:00 elharo Exp $
60 */
61
62
63
64 package org.jaxen.expr;
65
66 import java.util.ArrayList;
67 import java.util.List;
68 import org.jaxen.Context;
69 import org.jaxen.JaxenException;
70
71 /***
72 * @deprecated this class will become non-public in the future;
73 * use the interface instead
74 */
75 public class DefaultFilterExpr extends DefaultExpr implements FilterExpr, Predicated
76 {
77 private Expr expr;
78 private PredicateSet predicates;
79
80 public DefaultFilterExpr(PredicateSet predicateSet)
81 {
82 this.predicates = predicateSet;
83 }
84
85 public DefaultFilterExpr(Expr expr, PredicateSet predicateSet)
86 {
87 this.expr = expr;
88 this.predicates = predicateSet;
89 }
90
91 public void addPredicate(Predicate predicate)
92 {
93 this.predicates.addPredicate( predicate );
94 }
95
96 public List getPredicates()
97 {
98 return this.predicates.getPredicates();
99 }
100
101 public PredicateSet getPredicateSet()
102 {
103 return this.predicates;
104 }
105
106 public Expr getExpr()
107 {
108 return this.expr;
109 }
110
111 public String toString()
112 {
113 return "[(DefaultFilterExpr): expr: " + expr + " predicates: " + predicates + " ]";
114 }
115
116 public String getText()
117 {
118 String text = "";
119 if ( this.expr != null )
120 {
121 text = this.expr.getText();
122 }
123 text += predicates.getText();
124 return text;
125 }
126
127 public Expr simplify()
128 {
129 this.predicates.simplify();
130
131 if ( this.expr != null )
132 {
133 this.expr = this.expr.simplify();
134 }
135
136 if ( this.predicates.getPredicates().size() == 0 )
137 {
138 return getExpr();
139 }
140
141 return this;
142 }
143
144 /*** Returns true if the current filter matches at least one of the context nodes
145 */
146 public boolean asBoolean(Context context) throws JaxenException
147 {
148 Object results = null;
149 if ( expr != null )
150 {
151 results = expr.evaluate( context );
152 }
153 else
154 {
155 List nodeSet = context.getNodeSet();
156 ArrayList list = new ArrayList(nodeSet.size());
157 list.addAll( nodeSet );
158 results = list;
159 }
160
161 if ( results instanceof Boolean )
162 {
163 Boolean b = (Boolean) results;
164 return b.booleanValue();
165 }
166 if ( results instanceof List )
167 {
168 return getPredicateSet().evaluateAsBoolean(
169 (List) results, context.getContextSupport()
170 );
171 }
172
173 return false;
174 }
175
176 public Object evaluate(Context context) throws JaxenException
177 {
178 Object results = getExpr().evaluate( context );
179
180 if ( results instanceof List )
181 {
182 List newresults = getPredicateSet().evaluatePredicates( (List) results,
183 context.getContextSupport() );
184 results = newresults;
185 }
186
187 return results;
188 }
189 public void accept(Visitor visitor)
190 {
191 visitor.visit(this);
192 }
193 }