Mercurial > hg > digilib-old

comparison servlet/src/digilib/image/JAIImageLoaderDocuImage.java @ 588:aee436f0549d stream

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
more work on stream input
author robcast
date Thu, 06 Jan 2011 14:37:50 +0100
parents fd2ef7e46119
children 73e041c710d3
comparison
equal deleted inserted replaced
587:720d061a1b30 588:aee436f0549d
36 import javax.imageio.stream.ImageInputStream; 36 import javax.imageio.stream.ImageInputStream;
37 import javax.media.jai.JAI; 37 import javax.media.jai.JAI;
38 import javax.servlet.ServletException; 38 import javax.servlet.ServletException;
39 39
40 import digilib.io.FileOpException; 40 import digilib.io.FileOpException;
41 import digilib.io.ImageFile; 41 import digilib.io.ImageInput;
42 42
43 /** DocuImage implementation using the Java Advanced Imaging API and the ImageLoader 43 /** DocuImage implementation using the Java Advanced Imaging API and the ImageLoader
44 * API of Java 1.4. 44 * API of Java 1.4.
45 */ 45 */
46 public class JAIImageLoaderDocuImage extends JAIDocuImage { 46 public class JAIImageLoaderDocuImage extends JAIDocuImage {
78 return is; 78 return is;
79 } 79 }
80 80
81 81
82 /* Load an image file into the Object. */ 82 /* Load an image file into the Object. */
83 public void loadImage(ImageFile f) throws FileOpException { 83 public void loadImage(ImageInput ii) throws FileOpException {
84 logger.debug("loadImage: "+f.getFile()); 84 logger.debug("loadImage: "+ii.getFile());
85 //System.gc(); 85 //System.gc();
86 img = JAI.create("ImageRead", f.getFile().getAbsolutePath()); 86 img = JAI.create("ImageRead", ii.getFile().getAbsolutePath());
87 if (img == null) { 87 if (img == null) {
88 throw new FileOpException("Unable to load File!"); 88 throw new FileOpException("Unable to load File!");
89 } 89 }
90 mimeType = f.getMimetype();
91 } 90 }
92 91
93 /* Get an ImageReader for the image file. */ 92 /* Get an ImageReader for the image file. */
94 public ImageReader getReader(ImageFile f) throws IOException { 93 public ImageReader getReader(ImageInput input) throws IOException {
95 logger.debug("preloadImage: "+f.getFile()); 94 logger.debug("get ImageReader for " + input);
96 //System.gc(); 95 if (this.reader != null) {
97 RandomAccessFile rf = new RandomAccessFile(f.getFile(), "r"); 96 if (this.input == input) {
98 ImageInputStream istream = new FileImageInputStream(rf); 97 // it was the same input
99 //Iterator readers = ImageIO.getImageReaders(istream); 98 logger.debug("reusing Reader");
100 Iterator<ImageReader> readers = ImageIO.getImageReadersByMIMEType(f.getMimetype()); 99 return reader;
101 if (! readers.hasNext()) { 100 }
102 throw new FileOpException("Unable to load File!"); 101 // clean up old reader
103 } 102 logger.debug("cleaning Reader!");
104 reader = readers.next(); 103 dispose();
105 logger.debug("JAIImageIO: this reader: " + reader.getClass()); 104 }
106 while (readers.hasNext()) { 105 this.input = input;
107 logger.debug(" next reader: " + readers.next().getClass()); 106 ImageInputStream istream = null;
108 } 107 if (input.hasImageInputStream()) {
109 reader.setInput(istream); 108 // stream input
110 return reader; 109 istream = input.getImageInputStream();
110 } else if (input.hasFile()) {
111 // file only input
112 RandomAccessFile rf = new RandomAccessFile(input.getFile(), "r");
113 istream = new FileImageInputStream(rf);
114 } else {
115 throw new FileOpException("Unable to get data from ImageInput");
116 }
117 Iterator<ImageReader> readers;
118 String mt = input.getMimetype();
119 if (mt == null) {
120 logger.debug("No mime-type. Trying automagic.");
121 readers = ImageIO.getImageReaders(istream);
122 } else {
123 logger.debug("File type:" + mt);
124 readers = ImageIO.getImageReadersByMIMEType(mt);
125 }
126 if (!readers.hasNext()) {
127 throw new FileOpException("Can't find Reader to load File!");
128 }
129 reader = readers.next();
130 /* are there more readers? */
131 logger.debug("ImageIO: this reader: " + reader.getClass());
132 /* while (readers.hasNext()) {
133 logger.debug("ImageIO: next reader: " + readers.next().getClass());
134 } */
135 reader.setInput(istream);
136 return reader;
111 } 137 }
112 138
113 /* Load an image file into the Object. */ 139 /* Load an image file into the Object. */
114 public void loadSubimage(ImageFile f, Rectangle region, int prescale) 140 public void loadSubimage(ImageInput ii, Rectangle region, int prescale)
115 throws FileOpException { 141 throws FileOpException {
116 logger.debug("loadSubimage: "+f.getFile()); 142 logger.debug("loadSubimage: "+ii.getFile());
117 //System.gc(); 143 //System.gc();
118 try { 144 try {
119 if ((reader == null) || (imgFile != f.getFile())) { 145 if ((reader == null) || (imgFile != ii.getFile())) {
120 getReader(f); 146 getReader(ii);
121 } 147 }
122 ImageReadParam readParam = reader.getDefaultReadParam(); 148 ImageReadParam readParam = reader.getDefaultReadParam();
123 readParam.setSourceRegion(region); 149 readParam.setSourceRegion(region);
124 readParam.setSourceSubsampling(prescale, prescale, 0, 0); 150 readParam.setSourceSubsampling(prescale, prescale, 0, 0);
125 img = reader.read(0, readParam); 151 img = reader.read(0, readParam);
135 throw new FileOpException("Unable to load File!"); 161 throw new FileOpException("Unable to load File!");
136 } 162 }
137 if (img == null) { 163 if (img == null) {
138 throw new FileOpException("Unable to load File!"); 164 throw new FileOpException("Unable to load File!");
139 } 165 }
140 imgFile = f.getFile(); 166 imgFile = ii.getFile();
141 mimeType = f.getMimetype();
142 } 167 }
143 168
144 169
145 /* Write the current image to an OutputStream. */ 170 /* Write the current image to an OutputStream. */
146 public void writeImage(String mt, OutputStream ostream) 171 public void writeImage(String mt, OutputStream ostream)