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/* MediaTracker.java -- Class used for keeping track of images |
/* MediaTracker.java -- Class used for keeping track of images |
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Copyright (C) 1999 Free Software Foundation, Inc. |
Copyright (C) 1999, 2002 Free Software Foundation, Inc. |
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This file is part of GNU Classpath. |
This file is part of GNU Classpath. |
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package java.awt; |
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 |
* This class is used for keeping track of the status of various media |
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* objects. |
* objects. |
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* |
* |
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* @author Aaron M. Renn (arenn@urbanophile.com) |
* @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 |
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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} // class MediaTracker |
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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} |