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Java > Open Source Codes > org > apache > tapestry > enhance > DeferredScriptImpl


1 // Copyright 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.enhance;
16
17 import org.apache.hivemind.ApplicationRuntimeException;
18 import org.apache.hivemind.Locatable;
19 import org.apache.hivemind.Location;
20 import org.apache.hivemind.Resource;
21 import org.apache.hivemind.util.Defense;
22 import org.apache.tapestry.IScript;
23 import org.apache.tapestry.engine.IScriptSource;
24
25 /**
26  * @author Howard M. Lewis Ship
27  * @since 4.0
28  */
29 public class DeferredScriptImpl implements DeferredScript, Locatable
30 {
31     final Resource _scriptResource;
32
33     final IScriptSource _scriptSource;
34
35     final Location _location;
36
37     public DeferredScriptImpl(Resource resource, IScriptSource source, Location location)
38     {
39         Defense.notNull(resource, "resource");
40         Defense.notNull(source, "source");
41
42         _scriptResource = resource;
43         _scriptSource = source;
44         _location = location;
45     }
46
47     public IScript getScript()
48     {
49         // No real reason to cache the script here, because a) they are rarely used
50 // and b) the IScriptSource caches.
51
52         try
53         {
54             return _scriptSource.getScript(_scriptResource);
55         }
56         catch (Exception JavaDoc ex)
57         {
58             // Decorate the thrown exception with the correct location.
59
60             throw new ApplicationRuntimeException(ex.getMessage(), _location, ex);
61         }
62     }
63
64     public Location getLocation()
65     {
66         return _location;
67     }
68
69     public String JavaDoc toString()
70     {
71         return "DeferredScriptImpl[" + _scriptResource + "]";
72     }
73 }
74
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