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


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 a {@link org.apache.tapestry.script.ForeachToken}
22  * from a <foreach> element, which contains full content.
23  *
24  * <p>As of 3.0, then index attribute has been added to foreach to keep
25  * track of the current index of the iterating collection.</p>
26  *
27  * @author Howard Lewis Ship, Harish Krishnaswamy
28  * @since 3.0
29  */
30 class ForeachRule extends AbstractTokenRule
31 {
32
33     public void endElement(RuleDirectedParser parser)
34     {
35         parser.pop();
36     }
37
38     public void startElement(RuleDirectedParser parser, Attributes JavaDoc attributes)
39     {
40         String JavaDoc key = getAttribute(attributes, "key");
41         String JavaDoc index = getAttribute(attributes, "index");
42         String JavaDoc expression = getAttribute(attributes, "expression");
43
44         if (expression == null)
45             expression = getAttribute(attributes, "property-path"); // 1.0, 1.1 DTD
46
47         IScriptToken token = new ForeachToken(key, index, expression, parser.getLocation());
48
49         addToParent(parser, token);
50
51         parser.push(token);
52     }
53
54 }
55
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