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Java > Open Source Codes > org > apache > tapestry > engine > encoders > AssetEncoder


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.engine.encoders;
16
17 import org.apache.tapestry.Tapestry;
18 import org.apache.tapestry.asset.AssetService;
19 import org.apache.tapestry.engine.ServiceEncoder;
20 import org.apache.tapestry.engine.ServiceEncoding;
21 import org.apache.tapestry.services.ServiceConstants;
22
23 /**
24  * Encoder for the {@link org.apache.tapestry.asset.AssetService} that uses servlet path info
25  * to store the resource digest and the path to the resource.
26  *
27  * @author Howard M. Lewis Ship
28  * @since 4.0
29  */
30 public class AssetEncoder implements ServiceEncoder
31 {
32     private String JavaDoc _path;
33
34     public void setPath(String JavaDoc path)
35     {
36         _path = path;
37     }
38
39     public void encode(ServiceEncoding encoding)
40     {
41         if (!encoding.getParameterValue(ServiceConstants.SERVICE).equals(Tapestry.ASSET_SERVICE))
42             return;
43
44         String JavaDoc path = encoding.getParameterValue(AssetService.PATH);
45         String JavaDoc digest = encoding.getParameterValue(AssetService.DIGEST);
46
47         // _path ends with a slash, path starts with one.
48
49         String JavaDoc fullPath = _path + digest + path;
50
51         encoding.setServletPath(fullPath);
52         encoding.setParameterValue(AssetService.PATH, null);
53         encoding.setParameterValue(AssetService.DIGEST, null);
54         encoding.setParameterValue(ServiceConstants.SERVICE, null);
55     }
56
57     public void decode(ServiceEncoding encoding)
58     {
59         String JavaDoc fullPath = encoding.getServletPath();
60
61         if (!fullPath.startsWith(_path))
62             return;
63
64         String JavaDoc pathInfo = fullPath.substring(_path.length());
65         int slashx = pathInfo.indexOf('/');
66
67         encoding.setParameterValue(ServiceConstants.SERVICE, Tapestry.ASSET_SERVICE);
68         encoding.setParameterValue(AssetService.DIGEST, pathInfo.substring(0, slashx));
69         encoding.setParameterValue(AssetService.PATH, pathInfo.substring(slashx));
70     }
71
72 }
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