393 lines
8.4 KiB
Java
393 lines
8.4 KiB
Java
/* MediaTracker.java -- Class used for keeping track of images
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Copyright (C) 1999, 2002 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.awt;
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import java.util.ArrayList;
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import java.awt.image.ImageObserver;
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/**
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* This class is used for keeping track of the status of various media
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* objects.
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*
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* @author Aaron M. Renn (arenn@urbanophile.com)
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* @author Bryce McKinlay
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*/
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public class MediaTracker implements java.io.Serializable
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{
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public static final int LOADING = 1 << 0;
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public static final int ABORTED = 1 << 1;
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public static final int ERRORED = 1 << 2;
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public static final int COMPLETE = 1 << 3;
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Component target;
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MediaEntry head;
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static final long serialVersionUID = -483174189758638095L;
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// FIXME: The serialized form documentation says MediaEntry is a
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// serializable field, but the serialized form of MediaEntry itself
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// doesn't appear to be documented.
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class MediaEntry implements ImageObserver
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{
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int id;
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Image image;
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MediaEntry next;
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int status;
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int width;
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int height;
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public boolean imageUpdate(Image img, int flags, int x, int y,
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int width, int height)
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{
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if ((flags & ABORT) != 0)
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status = ABORTED & COMPLETE;
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else if ((flags & ERROR) != 0)
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status = ERRORED & COMPLETE;
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else if ((flags & ALLBITS) != 0)
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status = COMPLETE;
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else
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status = LOADING;
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synchronized (MediaTracker.this)
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{
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MediaTracker.this.notifyAll();
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}
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return ((status & COMPLETE) != 0);
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}
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}
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public MediaTracker(Component c)
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{
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target = c;
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}
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public void addImage(Image image, int id)
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{
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MediaEntry e = new MediaEntry();
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e.id = id;
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e.image = image;
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e.next = head;
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head = e;
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// Start tracking image status.
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target.checkImage(image, e);
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}
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public void addImage(Image image, int id, int width, int height)
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{
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MediaEntry e = new MediaEntry();
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e.id = id;
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e.image = image;
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e.next = head;
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e.width = width;
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e.height = height;
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head = e;
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// Start tracking image status.
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target.checkImage(image, width, height, e);
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}
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public boolean checkAll()
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{
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return checkAll(false);
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}
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public boolean checkAll(boolean load)
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{
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MediaEntry e = head;
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boolean result = true;
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while (e != null)
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{
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if ((e.status & COMPLETE) == 0)
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{
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if (load)
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{
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result = false;
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if (e.status == 0)
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{
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target.prepareImage(e.image, e);
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e.status = LOADING;
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}
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}
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else
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return false;
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}
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e = e.next;
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}
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return result;
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}
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public boolean isErrorAny()
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{
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MediaEntry e = head;
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while (e != null)
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{
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if ((e.status & ERRORED) != 0)
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return true;
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e = e.next;
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}
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return false;
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}
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public Object[] getErrorsAny()
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{
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MediaEntry e = head;
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ArrayList result = null;
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while (e != null)
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{
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if ((e.status & ERRORED) != 0)
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{
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if (result == null)
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result = new ArrayList();
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result.add(e.image);
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}
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e = e.next;
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}
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if (result == null)
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return null;
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else
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return result.toArray();
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}
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public void waitForAll() throws InterruptedException
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{
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synchronized (this)
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{
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while (checkAll(true) == false)
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wait();
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}
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}
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public boolean waitForAll(long ms) throws InterruptedException
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{
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long start = System.currentTimeMillis();
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synchronized (this)
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{
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while (!checkAll(true))
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wait(ms);
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}
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if ((System.currentTimeMillis() - start) < ms)
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return true;
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else
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return false;
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}
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public int statusAll(boolean load)
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{
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int result = 0;
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MediaEntry e = head;
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while (e != null)
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{
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if (load && e.status == 0)
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{
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target.prepareImage(e.image, e);
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e.status = LOADING;
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}
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result |= e.status;
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e = e.next;
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}
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return result;
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}
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public boolean checkID(int id)
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{
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return checkID(id, false);
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}
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public boolean checkID(int id, boolean load)
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{
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MediaEntry e = head;
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boolean result = true;
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while (e != null)
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{
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if (e.id == id && ((e.status & COMPLETE) == 0))
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{
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if (load)
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{
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result = false;
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if (e.status == 0)
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{
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target.prepareImage(e.image, e);
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e.status = LOADING;
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}
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}
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else
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return false;
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}
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e = e.next;
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}
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return result;
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}
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public boolean isErrorID(int id)
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{
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MediaEntry e = head;
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while (e != null)
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{
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if (e.id == id && ((e.status & ERRORED) != 0))
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return true;
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e = e.next;
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}
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return false;
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}
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public Object[] getErrorsID(int id)
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{
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MediaEntry e = head;
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ArrayList result = null;
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while (e != null)
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{
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if (e.id == id && ((e.status & ERRORED) != 0))
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{
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if (result == null)
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result = new ArrayList();
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result.add(e.image);
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}
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e = e.next;
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}
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if (result == null)
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return null;
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else
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return result.toArray();
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}
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public void waitForID(int id) throws InterruptedException
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{
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MediaEntry e = head;
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synchronized (this)
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{
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while (checkID (id, true) == false)
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wait();
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}
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}
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public boolean waitForID(int id, long ms) throws InterruptedException
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{
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MediaEntry e = head;
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long start = System.currentTimeMillis();
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synchronized (this)
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{
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while (checkID (id, true) == false)
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wait(ms);
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}
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if ((System.currentTimeMillis() - start) < ms)
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return true;
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else
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return false;
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}
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public int statusID(int id, boolean load)
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{
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int result = 0;
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MediaEntry e = head;
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while (e != null)
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{
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if (e.id == id)
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{
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if (load && e.status == 0)
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{
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target.prepareImage(e.image, e);
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e.status = LOADING;
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}
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result |= e.status;
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}
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e = e.next;
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}
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return result;
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}
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public void removeImage(Image image)
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{
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MediaEntry e = head;
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MediaEntry prev = null;
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while (e != null)
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{
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if (e.image == image)
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{
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if (prev == null)
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head = e.next;
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else
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prev.next = e.next;
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}
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prev = e;
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e = e.next;
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}
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}
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public void removeImage(Image image, int id)
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{
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MediaEntry e = head;
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MediaEntry prev = null;
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while (e != null)
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{
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if (e.id == id && e.image == image)
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{
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if (prev == null)
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head = e.next;
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else
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prev.next = e.next;
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}
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else
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prev = e;
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e = e.next;
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}
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}
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public void removeImage(Image image, int id, int width, int height)
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{
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MediaEntry e = head;
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MediaEntry prev = null;
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while (e != null)
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{
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if (e.id == id && e.image == image
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&& e.width == width && e.height == height)
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{
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if (prev == null)
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head = e.next;
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else
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prev.next = e.next;
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}
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else
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prev = e;
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e = e.next;
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}
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}
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}
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