01: /*
02: * This file is part of the Echo Web Application Framework (hereinafter "Echo").
03: * Copyright (C) 2002-2005 NextApp, Inc.
04: *
05: * Version: MPL 1.1/GPL 2.0/LGPL 2.1
06: *
07: * The contents of this file are subject to the Mozilla Public License Version
08: * 1.1 (the "License"); you may not use this file except in compliance with
09: * 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.webcontainer.image;
31:
32: import java.io.IOException;
33: import nextapp.echo2.app.AwtImageReference;
34: import nextapp.echo2.app.ImageReference;
35: import nextapp.echo2.webrender.Connection;
36: import nextapp.echo2.webrender.ContentType;
37: import nextapp.echo2.webrender.WebRenderServlet;
38:
39: /**
40: * Renders an <code>AwtImageReference</code> to the client.
41: */
42: public class AwtImageService extends AbstractImageService {
43:
44: private static final String SERVICE_ID = "Echo.AwtImage";
45:
46: public static final AwtImageService INSTANCE = new AwtImageService();
47:
48: static {
49: WebRenderServlet.getServiceRegistry().add(INSTANCE);
50: }
51:
52: /**
53: * @see nextapp.echo2.webrender.Service#getId()
54: */
55: public String getId() {
56: return SERVICE_ID;
57: }
58:
59: /**
60: * @see nextapp.echo2.webrender.Service#getVersion()
61: */
62: public int getVersion() {
63: return 0; // Enable caching.
64: }
65:
66: /**
67: * @see nextapp.echo2.webcontainer.image.AbstractImageService#renderImage(
68: * nextapp.echo2.webrender.Connection, nextapp.echo2.app.ImageReference)
69: */
70: public void renderImage(Connection conn,
71: ImageReference imageReference) throws IOException {
72: try {
73: if (!(imageReference instanceof AwtImageReference)) {
74: throw new IOException(
75: "Image is not an AwtImageReference.");
76: }
77: PngEncoder encoder = new PngEncoder(
78: ((AwtImageReference) imageReference).getImage(),
79: true, null, 3);
80: conn.setContentType(ContentType.IMAGE_PNG);
81: encoder.encode(conn.getOutputStream());
82: } catch (IOException ex) {
83: // Internet Explorer appears to enjoy making half-hearted requests for images, wherein it resets the connection
84: // leaving us with an IOException. This exception is silently eaten.
85: }
86: }
87: }
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