/* * Copyright (c) 1995, 2003, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation.  Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code 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 * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package sun.awt.image; import java.util.Hashtable;import java.io.InputStream;import java.io.IOException;import java.awt.image.*; public abstract class ImageDecoder {    InputStreamImageSource source;    InputStream input;    Thread feeder;     protected boolean aborted;    protected boolean finished;    ImageConsumerQueue queue;    ImageDecoder next;     public ImageDecoder(InputStreamImageSource src, InputStream is) {        source = src;        input = is;        feeder = Thread.currentThread();    }     public boolean isConsumer(ImageConsumer ic) {        return ImageConsumerQueue.isConsumer(queue, ic);    }     public void removeConsumer(ImageConsumer ic) {        queue = ImageConsumerQueue.removeConsumer(queue, ic, false);        if (!finished && queue == null) {            abort();        }    }     protected ImageConsumerQueue nextConsumer(ImageConsumerQueue cq) {        synchronized (source) {            if (aborted) {                return null;            }            cq = ((cq == null) ? queue : cq.next);            while (cq != null) {                if (cq.interested) {                    return cq;                }                cq = cq.next;            }        }        return null;    }     protected int setDimensions(int w, int h) {        ImageConsumerQueue cq = null;        int count = 0;        while ((cq = nextConsumer(cq)) != null) {            cq.consumer.setDimensions(w, h);            count++;        }        return count;    }     protected int setProperties(Hashtable props) {        ImageConsumerQueue cq = null;        int count = 0;        while ((cq = nextConsumer(cq)) != null) {            cq.consumer.setProperties(props);            count++;        }        return count;    }     protected int setColorModel(ColorModel model) {        ImageConsumerQueue cq = null;        int count = 0;        while ((cq = nextConsumer(cq)) != null) {            cq.consumer.setColorModel(model);            count++;        }        return count;    }     protected int setHints(int hints) {        ImageConsumerQueue cq = null;        int count = 0;        while ((cq = nextConsumer(cq)) != null) {            cq.consumer.setHints(hints);            count++;        }        return count;    }     protected void headerComplete() {        feeder.setPriority(ImageFetcher.LOW_PRIORITY);    }     protected int setPixels(int x, int y, int w, int h, ColorModel model,                            byte pix[], int off, int scansize) {        source.latchConsumers(this);        ImageConsumerQueue cq = null;        int count = 0;        while ((cq = nextConsumer(cq)) != null) {            cq.consumer.setPixels(x, y, w, h, model, pix, off, scansize);            count++;        }        return count;    }     protected int setPixels(int x, int y, int w, int h, ColorModel model,                            int pix[], int off, int scansize) {        source.latchConsumers(this);        ImageConsumerQueue cq = null;        int count = 0;        while ((cq = nextConsumer(cq)) != null) {            cq.consumer.setPixels(x, y, w, h, model, pix, off, scansize);            count++;        }        return count;    }     protected int imageComplete(int status, boolean done) {        source.latchConsumers(this);        if (done) {            finished = true;            source.doneDecoding(this);        }        ImageConsumerQueue cq = null;        int count = 0;        while ((cq = nextConsumer(cq)) != null) {            cq.consumer.imageComplete(status);            count++;        }        return count;    }     public abstract void produceImage() throws IOException,                                               ImageFormatException;     public void abort() {        aborted = true;        source.doneDecoding(this);        close();        java.security.AccessController.doPrivileged(            new java.security.PrivilegedAction() {            public Object run() {                feeder.interrupt();                return null;            }        });    }     public synchronized void close() {        if (input != null) {            try {                input.close();            } catch (IOException e) {            }        }    }}