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


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  *
21  * Like {@link org.apache.tapestry.script.LetToken}, but sets the value
22  * from an expression attribute, rather than a body of full content.
23  *
24  * @author Howard Lewis Ship
25  * @since 2.2
26  *
27  **/
28
29 class SetToken extends AbstractToken
30 {
31     private String JavaDoc _key;
32     private String JavaDoc _expression;
33
34     SetToken(String JavaDoc key, String JavaDoc expression, Location location)
35     {
36         super(location);
37         _key = key;
38         _expression = expression;
39     }
40
41     /**
42      *
43      * Doesn't <em>write</em>, it evaluates the expression and assigns
44      * the result back to the key.
45      *
46      **/
47
48     public void write(StringBuffer JavaDoc buffer, ScriptSession session)
49     {
50
51         Object JavaDoc value = evaluate(_expression, session);
52
53         session.getSymbols().put(_key, value);
54     }
55
56 }
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