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


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 token that writes the value of a property using a property path
21  * routed in the symbols..
22  *
23  * @author Howard Lewis Ship
24  *
25  **/
26
27 class InsertToken extends AbstractToken
28 {
29     private String JavaDoc _expression;
30
31     InsertToken(String JavaDoc expression, Location location)
32     {
33         super(location);
34
35         _expression = expression;
36     }
37
38     /**
39      * Gets the named symbol from the symbols {@link Map}, verifies that
40      * it is a String, and writes it to the {@link Writer}.
41      *
42      **/
43
44     public void write(StringBuffer JavaDoc buffer, ScriptSession session)
45     {
46         Object JavaDoc value = evaluate(_expression, session);
47
48         if (value != null)
49             buffer.append(value);
50     }
51
52     public void addToken(IScriptToken token)
53     {
54         // Should never be invoked.
55 }
56
57 }
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