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Java > Open Source Codes > org > apache > tapestry > web > ServletWebResponse


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.web;
16
17 import java.io.IOException JavaDoc;
18 import java.io.OutputStream JavaDoc;
19 import java.io.PrintWriter JavaDoc;
20
21 import javax.servlet.http.HttpServletResponse JavaDoc;
22
23 import org.apache.commons.logging.Log;
24 import org.apache.commons.logging.LogFactory;
25 import org.apache.hivemind.ApplicationRuntimeException;
26 import org.apache.hivemind.util.Defense;
27 import org.apache.tapestry.util.ContentType;
28
29 /**
30  * Adapts {@link javax.servlet.http.HttpServletResponse} as
31  * {@link org.apache.tapestry.web.WebResponse}.
32  *
33  * @author Howard M. Lewis Ship
34  * @since 4.0
35  */
36 public class ServletWebResponse implements WebResponse
37 {
38     private static final Log LOG = LogFactory.getLog(ServletWebResponse.class);
39
40     private final HttpServletResponse JavaDoc _servletResponse;
41
42     private boolean _needsReset;
43
44     public ServletWebResponse(HttpServletResponse JavaDoc response)
45     {
46         Defense.notNull(response, "response");
47
48         _servletResponse = response;
49     }
50
51     public OutputStream JavaDoc getOutputStream(ContentType contentType)
52     {
53         Defense.notNull(contentType, "contentType");
54
55         _servletResponse.setContentType(contentType.getMimeType());
56
57         try
58         {
59             return _servletResponse.getOutputStream();
60         }
61         catch (IOException JavaDoc ex)
62         {
63             throw new ApplicationRuntimeException(WebMessages.streamOpenError(contentType, ex),
64                     null, ex);
65         }
66     }
67
68     public PrintWriter JavaDoc getPrintWriter(ContentType contentType) throws IOException JavaDoc
69     {
70         Defense.notNull(contentType, "contentType");
71
72         if (_needsReset)
73             reset();
74
75         _needsReset = true;
76
77         _servletResponse.setContentType(contentType.toString());
78
79         try
80         {
81             return _servletResponse.getWriter();
82         }
83         catch (IOException JavaDoc ex)
84         {
85             throw new ApplicationRuntimeException(WebMessages.writerOpenError(contentType, ex),
86                     null, ex);
87         }
88     }
89
90     public String JavaDoc encodeURL(String JavaDoc url)
91     {
92         return _servletResponse.encodeURL(url);
93     }
94
95     public void reset()
96     {
97         try
98         {
99             _servletResponse.reset();
100         }
101         catch (IllegalStateException JavaDoc ex)
102         {
103             LOG.error(WebMessages.resetFailed(ex), ex);
104         }
105     }
106
107     public void setContentLength(int length)
108     {
109         _servletResponse.setContentLength(length);
110     }
111
112     public String JavaDoc getNamespace()
113     {
114         return "";
115     }
116
117     public void setDateHeader(String JavaDoc name, long date)
118     {
119         _servletResponse.setDateHeader(name, date);
120     }
121
122     public void setStatus(int status)
123     {
124         _servletResponse.setStatus(status);
125     }
126 }
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