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This file is included in the "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

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The source code

 * Copyright 2001-2004 The Apache Software Foundation
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
import java.util.Enumeration;

 * The CopyStreamAdapter will relay CopyStreamEvents to a list of listeners
 * when either of its bytesTransferred() methods are called.  Its purpose
 * is to facilitate the notification of the progress of a copy operation
 * performed by one of the static copyStream() methods in
 * to multiple listeners.  The static
 * copyStream() methods invoke the
 * bytesTransfered(long, int) of a CopyStreamListener for performance
 * reasons and also because multiple listeners cannot be registered given
 * that the methods are static.


* @see CopyStreamEvent * @see CopyStreamListener * @see Util * @author Daniel F. Savarese * @version $Id:,v 1.9 2004/02/29 10:26:55 scolebourne Exp $ */ public class CopyStreamAdapter implements CopyStreamListener { private ListenerList internalListeners; /** * Creates a new copyStreamAdapter. */ public CopyStreamAdapter() { internalListeners = new ListenerList(); } /** * This method is invoked by a CopyStreamEvent source after copying * a block of bytes from a stream. The CopyStreamEvent will contain * the total number of bytes transferred so far and the number of bytes * transferred in the last write. The CopyStreamAdapater will relay * the event to all of its registered listeners, listing itself as the * source of the event. * @param event The CopyStreamEvent fired by the copying of a block of * bytes. */ public void bytesTransferred(CopyStreamEvent event) { bytesTransferred(event.getTotalBytesTransferred(), event.getBytesTransferred(), event.getStreamSize()); } /** * This method is not part of the JavaBeans model and is used by the * static methods in the class for efficiency. * It is invoked after a block of bytes to inform the listener of the * transfer. The CopyStreamAdapater will create a CopyStreamEvent * from the arguments and relay the event to all of its registered * listeners, listing itself as the source of the event. * @param totalBytesTransferred The total number of bytes transferred * so far by the copy operation. * @param bytesTransferred The number of bytes copied by the most recent * write. * @param streamSize The number of bytes in the stream being copied. * This may be equal to CopyStreamEvent.UNKNOWN_STREAM_SIZE if * the size is unknown. */ public void bytesTransferred(long totalBytesTransferred, int bytesTransferred, long streamSize) { Enumeration listeners; CopyStreamEvent event; listeners = internalListeners.getListeners(); event = new CopyStreamEvent(this, totalBytesTransferred, bytesTransferred, streamSize); while (listeners.hasMoreElements()) { ((CopyStreamListener) (listeners.nextElement())). bytesTransferred(event); } } /** * Registers a CopyStreamListener to receive CopyStreamEvents. * Although this method is not declared to be synchronized, it is * implemented in a thread safe manner. * @param listener The CopyStreamlistener to register. */ public void addCopyStreamListener(CopyStreamListener listener) { internalListeners.addListener(listener); } /** * Unregisters a CopyStreamListener. Although this method is not * synchronized, it is implemented in a thread safe manner. * @param listener The CopyStreamlistener to unregister. */ public void removeCopyStreamListener(CopyStreamListener listener) { internalListeners.removeListener(listener); } }

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