001: /*
002: * $RCSfile: PNMImageReaderSpi.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: 1.2 $
042: * $Date: 2006/03/31 19:43:40 $
043: * $State: Exp $
044: */
045: package com.sun.media.imageioimpl.plugins.pnm;
046:
047: import java.util.Locale;
048: import javax.imageio.spi.ImageReaderSpi;
049: import javax.imageio.stream.ImageInputStream;
050: import javax.imageio.spi.IIORegistry;
051: import javax.imageio.spi.ServiceRegistry;
052: import java.io.IOException;
053: import javax.imageio.ImageReader;
054: import javax.imageio.IIOException;
055:
056: import com.sun.media.imageioimpl.common.PackageUtil;
057:
058: public class PNMImageReaderSpi extends ImageReaderSpi {
059:
060: private static String[] writerSpiNames = { "com.sun.media.imageioimpl.plugins.pnm.PNMImageWriterSpi" };
061: private static String[] formatNames = { "pnm", "PNM" };
062: private static String[] entensions = { "pbm", "pgm", "ppm" };
063: private static String[] mimeType = { "image/x-portable-anymap",
064: "image/x-portable-bitmap", "image/x-portable-graymap",
065: "image/x-portable-pixmap" };
066:
067: private boolean registered = false;
068:
069: public PNMImageReaderSpi() {
070: super (PackageUtil.getVendor(), PackageUtil.getVersion(),
071: formatNames, entensions, mimeType,
072: "com.sun.media.imageioimpl.plugins.pnm.PNMImageReader",
073: STANDARD_INPUT_TYPE, writerSpiNames, true, null, null,
074: null, null, true, null, null, null, null);
075: }
076:
077: public void onRegistration(ServiceRegistry registry, Class category) {
078: if (registered) {
079: return;
080: }
081: registered = true;
082: }
083:
084: public String getDescription(Locale locale) {
085: String desc = PackageUtil.getSpecificationTitle()
086: + " PNM Image Reader";
087: return desc;
088: }
089:
090: public boolean canDecodeInput(Object source) throws IOException {
091: if (!(source instanceof ImageInputStream)) {
092: return false;
093: }
094:
095: ImageInputStream stream = (ImageInputStream) source;
096: byte[] b = new byte[2];
097:
098: stream.mark();
099: stream.readFully(b);
100: stream.reset();
101:
102: return (b[0] == 0x50) && (b[1] >= 0x31) && (b[1] <= 0x36);
103: }
104:
105: public ImageReader createReaderInstance(Object extension)
106: throws IIOException {
107: return new PNMImageReader(this);
108: }
109: }
|