001 /* ImageReaderSpi.java -- 002 Copyright (C) 2004 Free Software Foundation, Inc. 003 004 This file is part of GNU Classpath. 005 006 GNU Classpath is free software; you can redistribute it and/or modify 007 it under the terms of the GNU General Public License as published by 008 the Free Software Foundation; either version 2, or (at your option) 009 any later version. 010 011 GNU Classpath is distributed in the hope that it will be useful, but 012 WITHOUT ANY WARRANTY; without even the implied warranty of 013 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014 General Public License for more details. 015 016 You should have received a copy of the GNU General Public License 017 along with GNU Classpath; see the file COPYING. If not, write to the 018 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 019 02110-1301 USA. 020 021 Linking this library statically or dynamically with other modules is 022 making a combined work based on this library. Thus, the terms and 023 conditions of the GNU General Public License cover the whole 024 combination. 025 026 As a special exception, the copyright holders of this library give you 027 permission to link this library with independent modules to produce an 028 executable, regardless of the license terms of these independent 029 modules, and to copy and distribute the resulting executable under 030 terms of your choice, provided that you also meet, for each linked 031 independent module, the terms and conditions of the license of that 032 module. An independent module is a module which is not derived from 033 or based on this library. If you modify this library, you may extend 034 this exception to your version of the library, but you are not 035 obligated to do so. If you do not wish to do so, delete this 036 exception statement from your version. */ 037 038 039 package javax.imageio.spi; 040 041 import java.io.IOException; 042 043 import javax.imageio.ImageReader; 044 import javax.imageio.stream.ImageInputStream; 045 046 /** 047 * @author Michael Koch (konqueror@gmx.de) 048 */ 049 public 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 }