001: /*
002: * $RCSfile: ChannelImageOutputStreamSpi.java,v $
003: *
004: *
005: * Copyright (c) 2005 Sun Microsystems, Inc. All Rights Reserved.
006: *
007: * Redistribution and use in source and binary forms, with or without
008: * modification, are permitted provided that the following conditions
009: * are met:
010: *
011: * - Redistribution of source code must retain the above copyright
012: * notice, this list of conditions and the following disclaimer.
013: *
014: * - Redistribution in binary form must reproduce the above copyright
015: * notice, this list of conditions and the following disclaimer in
016: * the documentation and/or other materials provided with the
017: * distribution.
018: *
019: * Neither the name of Sun Microsystems, Inc. or the names of
020: * contributors may be used to endorse or promote products derived
021: * from this software without specific prior written permission.
022: *
023: * This software is provided "AS IS," without a warranty of any
024: * kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
025: * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
026: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY
027: * EXCLUDED. SUN MIDROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL
028: * NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF
029: * USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
030: * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR
031: * ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
032: * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
033: * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
034: * INABILITY TO USE THIS SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
035: * POSSIBILITY OF SUCH DAMAGES.
036: *
037: * You acknowledge that this software is not designed or intended for
038: * use in the design, construction, operation or maintenance of any
039: * nuclear facility.
040: *
041: * $Revision: 1.1 $
042: * $Date: 2005/02/11 05:01:53 $
043: * $State: Exp $
044: */
045: package com.sun.media.imageioimpl.stream;
046:
047: import java.io.File;
048: import java.io.OutputStream;
049: import java.io.IOException;
050: import java.nio.channels.Channels;
051: import java.nio.channels.FileChannel;
052: import java.nio.channels.NonReadableChannelException;
053: import java.nio.channels.WritableByteChannel;
054: import java.util.Locale;
055: import javax.imageio.spi.ImageOutputStreamSpi;
056: import javax.imageio.stream.FileCacheImageOutputStream;
057: import javax.imageio.stream.ImageOutputStream;
058: import javax.imageio.stream.MemoryCacheImageOutputStream;
059: import com.sun.media.imageio.stream.FileChannelImageOutputStream;
060: import com.sun.media.imageioimpl.common.PackageUtil;
061:
062: public class ChannelImageOutputStreamSpi extends ImageOutputStreamSpi {
063: public ChannelImageOutputStreamSpi() {
064: super (PackageUtil.getVendor(), PackageUtil.getVersion(),
065: WritableByteChannel.class);
066: }
067:
068: public ImageOutputStream createOutputStreamInstance(Object output,
069: boolean useCache, File cacheDir) throws IOException {
070:
071: if (output == null || !(output instanceof WritableByteChannel)) {
072: throw new IllegalArgumentException(
073: "Cannot create ImageOutputStream from "
074: + output.getClass().getName());
075: }
076:
077: ImageOutputStream stream = null;
078:
079: if (output instanceof FileChannel) {
080: FileChannel channel = (FileChannel) output;
081: try {
082: // The Channel must be readable.
083: channel.map(FileChannel.MapMode.READ_ONLY, channel
084: .position(), 1);
085: stream = new FileChannelImageOutputStream(
086: (FileChannel) output);
087: } catch (NonReadableChannelException nrce) {
088: // Ignore it.
089: }
090: }
091:
092: if (stream == null) {
093: OutputStream outStream = Channels
094: .newOutputStream((WritableByteChannel) output);
095:
096: if (useCache) {
097: try {
098: stream = new FileCacheImageOutputStream(outStream,
099: cacheDir);
100: } catch (IOException e) {
101: // Cache file could not be created.
102: }
103: }
104:
105: if (stream == null) {
106: stream = new MemoryCacheImageOutputStream(outStream);
107: }
108: }
109:
110: return stream;
111: }
112:
113: public String getDescription(Locale locale) {
114: return "NIO Channel ImageOutputStream";
115: }
116: }
|