1 /**
2 * This file Copyright (c) 2011-2013 Magnolia International
3 * Ltd. (http://www.magnolia-cms.com). All rights reserved.
4 *
5 *
6 * This file is dual-licensed under both the Magnolia
7 * Network Agreement and the GNU General Public License.
8 * You may elect to use one or the other of these licenses.
9 *
10 * This file is distributed in the hope that it will be
11 * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the
12 * implied warranty of MERCHANTABILITY or FITNESS FOR A
13 * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT.
14 * Redistribution, except as permitted by whichever of the GPL
15 * or MNA you select, is prohibited.
16 *
17 * 1. For the GPL license (GPL), you can redistribute and/or
18 * modify this file under the terms of the GNU General
19 * Public License, Version 3, as published by the Free Software
20 * Foundation. You should have received a copy of the GNU
21 * General Public License, Version 3 along with this program;
22 * if not, write to the Free Software Foundation, Inc., 51
23 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
24 *
25 * 2. For the Magnolia Network Agreement (MNA), this file
26 * and the accompanying materials are made available under the
27 * terms of the MNA which accompanies this distribution, and
28 * is available at http://www.magnolia-cms.com/mna.html
29 *
30 * Any modifications to this file must keep this entire header
31 * intact.
32 *
33 */
34 package info.magnolia.rendering.engine;
35
36 import java.io.IOException;
37 import java.io.OutputStream;
38
39 import javax.servlet.http.HttpServletResponse;
40
41 /**
42 * Output provider wrapping response.
43 *
44 * @version $Id$
45 *
46 */
47 public class ResponseOutputProvider implements OutputProvider {
48
49 private final HttpServletResponse response;
50 private boolean streamCalled;
51 private boolean writerCalled;
52
53 public ResponseOutputProvider(HttpServletResponse response) {
54 this.response = response;
55 }
56
57 @Override
58 public Appendable getAppendable() throws IOException {
59 if (streamCalled) {
60 throw new IOException("Can't use appendable and output stream in parallel. getOutputStream() was already called.");
61 }
62 writerCalled = true;
63 return response.getWriter();
64 }
65
66 @Override
67 public OutputStream getOutputStream() throws IOException {
68 if (writerCalled) {
69 throw new IOException("Can't use appendable and output stream in parallel. getAppendable() was already called.");
70 }
71 streamCalled = true;
72 return response.getOutputStream();
73 }
74
75 }