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Java > Open Source Codes > nextapp > echo2 > webrender > service > StaticBinaryService


1 /*
2  * This file is part of the Echo Web Application Framework (hereinafter "Echo").
3  * Copyright (C) 2002-2005 NextApp, Inc.
4  *
5  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
6  *
7  * The contents of this file are subject to the Mozilla Public License Version
8  * 1.1 (the "License"); you may not use this file except in compliance with
9  * the License. You may obtain a copy of the License at
10  * http://www.mozilla.org/MPL/
11  *
12  * Software distributed under the License is distributed on an "AS IS" basis,
13  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
14  * for the specific language governing rights and limitations under the
15  * License.
16  *
17  * Alternatively, the contents of this file may be used under the terms of
18  * either the GNU General Public License Version 2 or later (the "GPL"), or
19  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
20  * in which case the provisions of the GPL or the LGPL are applicable instead
21  * of those above. If you wish to allow use of your version of this file only
22  * under the terms of either the GPL or the LGPL, and not to allow others to
23  * use your version of this file under the terms of the MPL, indicate your
24  * decision by deleting the provisions above and replace them with the notice
25  * and other provisions required by the GPL or the LGPL. If you do not delete
26  * the provisions above, a recipient may use your version of this file under
27  * the terms of any one of the MPL, the GPL or the LGPL.
28  */
29
30 package nextapp.echo2.webrender.service;
31
32 import java.io.IOException JavaDoc;
33
34 import nextapp.echo2.webrender.Connection;
35 import nextapp.echo2.webrender.Service;
36 import nextapp.echo2.webrender.util.Resource;
37
38 /**
39  * A <code>Service</code> which renders a static binary resource.
40  */
41 public class StaticBinaryService
42 implements Service {
43
44    /**
45      * Creates a new <code>StaticBinaryService</code> based on the data in the
46      * specified <code>CLASSPATH</code> resource. A runtime exception will be
47      * thrown in the even the resource does not exist (it generally should not
48      * be caught).
49      *
50      * @param id the <code>Service</code> identifier
51      * @param contentType the content type
52      * @param resourceName the path to the content data in the
53      * <code>CLASSPATH</code>
54      * @return the created <code>StaticBinaryService</code>
55      */
56     public static StaticBinaryService forResource(String JavaDoc id, String JavaDoc contentType, String JavaDoc resourceName) {
57         byte[] data = Resource.getResourceAsByteArray(resourceName);
58         return new StaticBinaryService(id, contentType, data);
59     }
60
61     private String JavaDoc id;
62     private byte[] data;
63     private String JavaDoc contentType;
64     
65     /**
66      * Creates a new <code>StaticBinaryService</code>.
67      *
68      * @param id the <code>Service</code> identifier
69      * @param contentType the content type
70      * @param data the binary data
71      */
72     public StaticBinaryService(String JavaDoc id, String JavaDoc contentType, byte[] data) {
73         super();
74         this.id = id;
75         this.contentType = contentType;
76         this.data = data;
77     }
78     
79     /**
80      * @see nextapp.echo2.webrender.Service#getId()
81      */
82     public String JavaDoc getId() {
83         return id;
84     }
85
86     /**
87      * @see nextapp.echo2.webrender.Service#getVersion()
88      */
89     public int getVersion() {
90         return 0;
91     }
92
93     /**
94      * @see nextapp.echo2.webrender.Service#service(nextapp.echo2.webrender.Connection)
95      */
96     public void service(Connection conn)
97     throws IOException JavaDoc {
98         try {
99             conn.getResponse().setContentType(contentType);
100             conn.getOutputStream().write(data);
101         } catch (IOException JavaDoc ex) {
102             // Internet Explorer appears to enjoy making half-hearted requests for images, wherein it resets the connection
103 // leaving us with an IOException. This exception is silently eaten.
104 // It would preferable to only ignore SocketExceptions, however the API documentation does not provide
105 // enough information to suggest that such a strategy would be adequate..
106 }
107     }
108 }
109
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