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


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.Tapestry;
18 import org.apache.tapestry.util.xml.RuleDirectedParser;
19 import org.xml.sax.Attributes JavaDoc;
20
21 /**
22  * Constructs an {@link org.apache.tapestry.script.LetToken}
23  * from a <let> element, which may contain full content.
24  *
25  * @author Howard Lewis Ship
26  * @since 3.0
27  */
28 class LetRule extends AbstractTokenRule
29 {
30
31     public void startElement(RuleDirectedParser parser, Attributes JavaDoc attributes)
32     {
33         String JavaDoc key = getAttribute(attributes, "key");
34         
35         String JavaDoc unique = getAttribute(attributes, "unique");
36         boolean uniqueFlag = unique != null && unique.equals("yes");
37
38         parser.validate(key, Tapestry.SIMPLE_PROPERTY_NAME_PATTERN, "ScriptParser.invalid-key");
39
40         LetToken token = new LetToken(key, uniqueFlag, parser.getLocation());
41
42         addToParent(parser, token);
43
44         parser.push(token);
45     }
46
47     public void endElement(RuleDirectedParser parser)
48     {
49         parser.pop();
50     }
51
52 }
53
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