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


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.hivemind.Location;
18
19 /**
20  * A conditional portion of the generated script.
21  *
22  * @author Howard Lewis Ship
23  * @since 1.0.1
24  */
25
26 class IfToken extends AbstractToken
27 {
28     private boolean _condition;
29
30     private String JavaDoc _expression;
31
32     IfToken(boolean condition, String JavaDoc expression, Location location)
33     {
34         super(location);
35
36         _condition = condition;
37         _expression = expression;
38     }
39
40     private boolean evaluate(ScriptSession session)
41     {
42         return evaluateBoolean(_expression, session);
43     }
44
45     public void write(StringBuffer JavaDoc buffer, ScriptSession session)
46     {
47         if (evaluate(session) == _condition)
48             writeChildren(buffer, session);
49     }
50 }
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