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


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.engine.ServiceEncoder;
18 import org.apache.tapestry.engine.ServiceEncoding;
19 import org.apache.tapestry.services.ServiceConstants;
20
21 /**
22  * Encodes the service name, typical output is "/page.svc" where "page" is a service name. This is
23  * useful for the home and restart services, for example. This encoder should be prioritized very
24  * low so that it doesn't prevent other encoders from doing their work.
25  *
26  * @author Howard M. Lewis Ship
27  * @since 4.0
28  */
29 public class ServiceExtensionEncoder implements ServiceEncoder
30 {
31     private String JavaDoc _extension;
32
33     public void setExtension(String JavaDoc extension)
34     {
35         _extension = extension;
36     }
37
38     public void encode(ServiceEncoding encoding)
39     {
40         String JavaDoc service = encoding.getParameterValue(ServiceConstants.SERVICE);
41
42         // Can assume this is never null.
43
44         encoding.setServletPath("/" + service + "." + _extension);
45         encoding.setParameterValue(ServiceConstants.SERVICE, null);
46     }
47
48     public void decode(ServiceEncoding encoding)
49     {
50         String JavaDoc servletPath = encoding.getServletPath();
51
52         int dotx = servletPath.lastIndexOf('.');
53
54         String JavaDoc extension = servletPath.substring(dotx + 1);
55
56         if (!extension.equals(_extension))
57             return;
58
59         // The first character should be a slash, then the service name, then the dot.
60
61         String JavaDoc service = servletPath.substring(1, dotx);
62
63         encoding.setParameterValue(ServiceConstants.SERVICE, service);
64     }
65
66 }
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