001: /*
002: * $RCSfile: ChannelImageInputStreamSpi.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.InputStream;
049: import java.io.IOException;
050: import java.nio.channels.Channels;
051: import java.nio.channels.FileChannel;
052: import java.nio.channels.ReadableByteChannel;
053: import java.util.Locale;
054: import javax.imageio.spi.ImageInputStreamSpi;
055: import javax.imageio.stream.FileCacheImageInputStream;
056: import javax.imageio.stream.ImageInputStream;
057: import javax.imageio.stream.MemoryCacheImageInputStream;
058: import com.sun.media.imageio.stream.FileChannelImageInputStream;
059: import com.sun.media.imageioimpl.common.PackageUtil;
060:
061: public class ChannelImageInputStreamSpi extends ImageInputStreamSpi {
062: public ChannelImageInputStreamSpi() {
063: super (PackageUtil.getVendor(), PackageUtil.getVersion(),
064: ReadableByteChannel.class);
065: }
066:
067: public ImageInputStream createInputStreamInstance(Object input,
068: boolean useCache, File cacheDir) throws IOException {
069:
070: if (input == null || !(input instanceof ReadableByteChannel)) {
071: throw new IllegalArgumentException("XXX");
072: }
073:
074: ImageInputStream stream = null;
075:
076: if (input instanceof FileChannel) {
077: stream = new FileChannelImageInputStream(
078: (FileChannel) input);
079: } else {
080: InputStream inStream = Channels
081: .newInputStream((ReadableByteChannel) input);
082:
083: if (useCache) {
084: try {
085: stream = new FileCacheImageInputStream(inStream,
086: cacheDir);
087: } catch (IOException e) {
088: // Cache file could not be created.
089: }
090: }
091:
092: if (stream == null) {
093: stream = new MemoryCacheImageInputStream(inStream);
094: }
095: }
096:
097: return stream;
098: }
099:
100: public String getDescription(Locale locale) {
101: return "NIO Channel ImageInputStream";
102: }
103: }
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