| /* ImageDecoder.java |
| Copyright (C) 1999, 2000, 2004 Free Software Foundation, Inc. |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| GNU Classpath is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| package gnu.java.awt.image; |
| |
| import java.awt.image.ImageConsumer; |
| import java.awt.image.ImageProducer; |
| import java.io.ByteArrayInputStream; |
| import java.io.FileInputStream; |
| import java.io.InputStream; |
| import java.io.IOException; |
| import java.net.URL; |
| import java.util.Vector; |
| |
| public abstract class ImageDecoder implements ImageProducer |
| { |
| Vector consumers = new Vector (); |
| String filename; |
| URL url; |
| byte[] data; |
| int offset; |
| int length; |
| InputStream input; |
| |
| static |
| { |
| // FIXME: there was some broken code here that looked like |
| // it wanted to rely on this property. I don't have any idea |
| // what it was intended to do. |
| // String endian = System.getProperties ().getProperty ("gnu.cpu.endian"); |
| } |
| |
| public ImageDecoder (String filename) |
| { |
| this.filename = filename; |
| } |
| |
| public ImageDecoder (URL url) |
| { |
| this.url = url; |
| } |
| |
| public ImageDecoder (InputStream is) |
| { |
| this.input = is; |
| } |
| |
| public ImageDecoder (byte[] imagedata, int imageoffset, int imagelength) |
| { |
| data = imagedata; |
| offset = imageoffset; |
| length = imagelength; |
| } |
| |
| public void addConsumer (ImageConsumer ic) |
| { |
| consumers.addElement (ic); |
| } |
| |
| public boolean isConsumer (ImageConsumer ic) |
| { |
| return consumers.contains (ic); |
| } |
| |
| public void removeConsumer (ImageConsumer ic) |
| { |
| consumers.removeElement (ic); |
| } |
| |
| public void startProduction (ImageConsumer ic) |
| { |
| if (!isConsumer(ic)) |
| addConsumer(ic); |
| |
| Vector list = (Vector) consumers.clone (); |
| try |
| { |
| // Create the input stream here rather than in the |
| // ImageDecoder constructors so that exceptions cause |
| // imageComplete to be called with an appropriate error |
| // status. |
| if (input == null) |
| { |
| try |
| { |
| if (url != null) |
| input = url.openStream(); |
| else |
| { |
| if (filename != null) |
| input = new FileInputStream (filename); |
| else |
| input = new ByteArrayInputStream (data, offset, length); |
| } |
| produce (list, input); |
| } |
| finally |
| { |
| input = null; |
| } |
| } |
| else |
| { |
| produce (list, input); |
| } |
| } |
| catch (Exception e) |
| { |
| for (int i = 0; i < list.size (); i++) |
| { |
| ImageConsumer ic2 = (ImageConsumer) list.elementAt (i); |
| ic2.imageComplete (ImageConsumer.IMAGEERROR); |
| } |
| } |
| } |
| |
| public void requestTopDownLeftRightResend (ImageConsumer ic) |
| { |
| } |
| |
| public abstract void produce (Vector v, InputStream is) throws IOException; |
| } |