001/* ImageReaderSpi.java -- 002 Copyright (C) 2004 Free Software Foundation, Inc. 003 004This file is part of GNU Classpath. 005 006GNU Classpath is free software; you can redistribute it and/or modify 007it under the terms of the GNU General Public License as published by 008the Free Software Foundation; either version 2, or (at your option) 009any later version. 010 011GNU Classpath is distributed in the hope that it will be useful, but 012WITHOUT ANY WARRANTY; without even the implied warranty of 013MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014General Public License for more details. 015 016You should have received a copy of the GNU General Public License 017along with GNU Classpath; see the file COPYING. If not, write to the 018Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 01902110-1301 USA. 020 021Linking this library statically or dynamically with other modules is 022making a combined work based on this library. Thus, the terms and 023conditions of the GNU General Public License cover the whole 024combination. 025 026As a special exception, the copyright holders of this library give you 027permission to link this library with independent modules to produce an 028executable, regardless of the license terms of these independent 029modules, and to copy and distribute the resulting executable under 030terms of your choice, provided that you also meet, for each linked 031independent module, the terms and conditions of the license of that 032module. An independent module is a module which is not derived from 033or based on this library. If you modify this library, you may extend 034this exception to your version of the library, but you are not 035obligated to do so. If you do not wish to do so, delete this 036exception statement from your version. */ 037 038 039package javax.imageio.spi; 040 041import java.io.IOException; 042 043import javax.imageio.ImageReader; 044import javax.imageio.stream.ImageInputStream; 045 046/** 047 * @author Michael Koch (konqueror@gmx.de) 048 */ 049public abstract class ImageReaderSpi extends ImageReaderWriterSpi 050{ 051 public static final Class[] STANDARD_INPUT_TYPE = 052 { ImageInputStream.class }; 053 054 protected Class[] inputTypes; 055 protected String[] writerSpiNames; 056 057 protected ImageReaderSpi() 058 { 059 // Do nothing here. 060 } 061 062 public ImageReaderSpi(String vendorName, String version, String[] names, 063 String[] suffixes, String[] MIMETypes, 064 String readerClassName, Class[] inputTypes, 065 String[] writerSpiNames, 066 boolean supportsStandardStreamMetadataFormat, 067 String nativeStreamMetadataFormatName, 068 String nativeStreamMetadataFormatClassName, 069 String[] extraStreamMetadataFormatNames, 070 String[] extraStreamMetadataFormatClassNames, 071 boolean supportsStandardImageMetadataFormat, 072 String nativeImageMetadataFormatName, 073 String nativeImageMetadataFormatClassName, 074 String[] extraImageMetadataFormatNames, 075 String[] extraImageMetadataFormatClassNames) 076 { 077 super(vendorName, version, names, suffixes, MIMETypes, readerClassName, 078 supportsStandardStreamMetadataFormat, nativeStreamMetadataFormatName, 079 nativeStreamMetadataFormatClassName, extraStreamMetadataFormatNames, 080 extraStreamMetadataFormatClassNames, supportsStandardImageMetadataFormat, 081 nativeImageMetadataFormatName, nativeImageMetadataFormatClassName, 082 extraImageMetadataFormatNames, extraImageMetadataFormatClassNames); 083 084 if (inputTypes == null 085 || inputTypes.length == 0) 086 throw new IllegalArgumentException("inputTypes may not be null or empty"); 087 088 this.inputTypes = inputTypes; 089 this.writerSpiNames = writerSpiNames; 090 } 091 092 public abstract boolean canDecodeInput(Object source) 093 throws IOException; 094 095 public ImageReader createReaderInstance() 096 throws IOException 097 { 098 return createReaderInstance(null); 099 } 100 101 public abstract ImageReader createReaderInstance(Object extension) 102 throws IOException; 103 104 public String[] getImageWriterSpiNames() 105 { 106 return writerSpiNames; 107 } 108 109 public Class[] getInputTypes() 110 { 111 return inputTypes; 112 } 113 114 public boolean isOwnReader(ImageReader reader) 115 { 116 if (reader == null) 117 throw new IllegalArgumentException("reader may not be null"); 118 119 return pluginClassName.equals(reader.getClass().getName()); 120 } 121}