Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
UniqueToken |
|
| 2.0;2 |
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 | import org.apache.tapestry.IRequestCycle; | |
19 | ||
20 | /** | |
21 | * Writes out its child tokens only the first time it executes | |
22 | * (with a given tag). Uses | |
23 | * {@link org.apache.tapestry.IRequestCycle#setAttribute(String, Object)} | |
24 | * to identify whether a particular block has rendered yet. | |
25 | * | |
26 | * @author Howard Lewis Ship | |
27 | * @since 3.0 | |
28 | */ | |
29 | ||
30 | class UniqueToken extends AbstractToken | |
31 | { | |
32 | public UniqueToken(Location location) | |
33 | { | |
34 | 0 | super(location); |
35 | 0 | } |
36 | ||
37 | public void write(StringBuffer buffer, ScriptSession session) | |
38 | { | |
39 | 0 | IRequestCycle cycle = session.getRequestCycle(); |
40 | ||
41 | 0 | Location location = getLocation(); |
42 | 0 | String tag = "<unique> " + location.toString(); |
43 | ||
44 | 0 | if (cycle.getAttribute(tag) != null) |
45 | 0 | return; |
46 | ||
47 | 0 | cycle.setAttribute(tag, Boolean.TRUE); |
48 | ||
49 | 0 | writeChildren(buffer, session); |
50 | 0 | } |
51 | ||
52 | } |