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


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  * Generates a String from its child tokens, then applies it
21  * to {@link ScriptSessionImpl#setInitialization(String)}.
22  *
23  * @author Howard Lewis Ship
24  * @since 0.2.9
25  *
26  **/
27
28 class InitToken extends AbstractToken
29 {
30     private int _bufferLengthHighwater = 100;
31
32     public InitToken(Location location)
33     {
34         super(location);
35     }
36
37     public void write(StringBuffer JavaDoc buffer, ScriptSession session)
38     {
39         if (buffer != null)
40             throw new IllegalArgumentException JavaDoc();
41
42         buffer = new StringBuffer JavaDoc(_bufferLengthHighwater);
43
44         writeChildren(buffer, session);
45
46         session.addInitializationScript(buffer.toString());
47
48         // Store the buffer length from this run for the next run, since its
49 // going to be approximately the right size.
50
51         _bufferLengthHighwater = Math.max(_bufferLengthHighwater, buffer.length());
52     }
53 }
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