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.app;
31:
32: import java.io.IOException;
33: import java.io.OutputStream;
34:
35: /**
36: *
37: */
38: public abstract class StreamImageReference implements ImageReference {
39:
40: /**
41: * Default constructor.
42: */
43: public StreamImageReference() {
44: super ();
45: }
46:
47: /**
48: * Returns the valid RFC 1521 image content type (e.g., image/png,
49: * image/jpeg, image/gif, etc) of the image.
50: *
51: * @return the content type of the image
52: */
53: public abstract String getContentType();
54:
55: /**
56: * @see nextapp.echo2.app.ImageReference#getHeight()
57: */
58: public Extent getHeight() {
59: return null;
60: }
61:
62: /**
63: * @see nextapp.echo2.app.ImageReference#getWidth()
64: */
65: public Extent getWidth() {
66: return null;
67: }
68:
69: /**
70: * Renders the image data in its native format to the given output stream.
71: *
72: * @param out the output stream to write the image
73: */
74: public abstract void render(OutputStream out) throws IOException;
75: }
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