1 /*
2 * $RCSfile: ChannelImageOutputStreamSpi.java,v $
3 *
4 *
5 * Copyright (c) 2005 Sun Microsystems, Inc. All Rights Reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * - Redistribution of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 *
14 * - Redistribution in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
17 * distribution.
18 *
19 * Neither the name of Sun Microsystems, Inc. or the names of
20 * contributors may be used to endorse or promote products derived
21 * from this software without specific prior written permission.
22 *
23 * This software is provided "AS IS," without a warranty of any
24 * kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
25 * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
26 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY
27 * EXCLUDED. SUN MIDROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL
28 * NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF
29 * USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
30 * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR
31 * ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
32 * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
33 * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
34 * INABILITY TO USE THIS SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
35 * POSSIBILITY OF SUCH DAMAGES.
36 *
37 * You acknowledge that this software is not designed or intended for
38 * use in the design, construction, operation or maintenance of any
39 * nuclear facility.
40 *
41 * $Revision: 1.1 $
42 * $Date: 2005/02/11 05:01:53 $
43 * $State: Exp $
44 */
45 package com.github.jaiimageio.impl.stream;
46
47 import java.io.File;
48 import java.io.IOException;
49 import java.io.OutputStream;
50 import java.nio.channels.Channels;
51 import java.nio.channels.FileChannel;
52 import java.nio.channels.NonReadableChannelException;
53 import java.nio.channels.WritableByteChannel;
54 import java.util.Locale;
55
56 import javax.imageio.spi.ImageOutputStreamSpi;
57 import javax.imageio.stream.FileCacheImageOutputStream;
58 import javax.imageio.stream.ImageOutputStream;
59 import javax.imageio.stream.MemoryCacheImageOutputStream;
60
61 import com.github.jaiimageio.impl.common.PackageUtil;
62 import com.github.jaiimageio.stream.FileChannelImageOutputStream;
63
64 public class ChannelImageOutputStreamSpi extends ImageOutputStreamSpi {
65 public ChannelImageOutputStreamSpi() {
66 super(PackageUtil.getVendor(),
67 PackageUtil.getVersion(),
68 WritableByteChannel.class);
69 }
70
71 public ImageOutputStream createOutputStreamInstance(Object output,
72 boolean useCache,
73 File cacheDir)
74 throws IOException {
75
76 if(output == null ||
77 !(output instanceof WritableByteChannel)) {
78 throw new IllegalArgumentException
79 ("Cannot create ImageOutputStream from "+
80 output.getClass().getName());
81 }
82
83 ImageOutputStream stream = null;
84
85 if(output instanceof FileChannel) {
86 FileChannel channel = (FileChannel)output;
87 try {
88 // The Channel must be readable.
89 channel.map(FileChannel.MapMode.READ_ONLY,
90 channel.position(),
91 1);
92 stream = new FileChannelImageOutputStream((FileChannel)output);
93 } catch(NonReadableChannelException nrce) {
94 // Ignore it.
95 }
96 }
97
98 if(stream == null) {
99 OutputStream outStream =
100 Channels.newOutputStream((WritableByteChannel)output);
101
102 if(useCache) {
103 try {
104 stream = new FileCacheImageOutputStream(outStream,
105 cacheDir);
106 } catch(IOException e) {
107 // Cache file could not be created.
108 }
109 }
110
111 if(stream == null) {
112 stream = new MemoryCacheImageOutputStream(outStream);
113 }
114 }
115
116 return stream;
117 }
118
119 public String getDescription(Locale locale) {
120 return "NIO Channel ImageOutputStream";
121 }
122 }
123