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Java > Open Source Codes > org > apache > tapestry > script > IfRule


1 // Copyright 2004, 2005 The Apache Software Foundation
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14
15 package org.apache.tapestry.script;
16
17 import org.apache.tapestry.util.xml.RuleDirectedParser;
18 import org.xml.sax.Attributes JavaDoc;
19
20 /**
21  * Constructs an {@link org.apache.tapestry.script.IfToken}
22  * from an <if> or <if-not> element, which
23  * contains full content.
24  *
25  * @author Howard Lewis Ship
26  * @since 3.0
27  */
28 class IfRule extends AbstractTokenRule
29 {
30     private boolean _condition;
31
32     public IfRule(boolean condition)
33     {
34         _condition = condition;
35     }
36
37     public void endElement(RuleDirectedParser parser)
38     {
39         parser.pop();
40     }
41
42     public void startElement(RuleDirectedParser parser, Attributes JavaDoc attributes)
43     {
44         String JavaDoc expression = getAttribute(attributes, "expression");
45
46         if (expression == null)
47             expression = getAttribute(attributes, "property-path"); // 1.0, 1.1 DTD
48
49         IScriptToken token = new IfToken(_condition, expression, parser.getLocation());
50         
51         addToParent(parser, token);
52         
53         parser.push(token);
54     }
55
56 }
57
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