Source Code Cross Referenced for CopyStreamAdapter.java in  » Net » Apache-commons-net-1.4.1 » org » apache » commons » net » io » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Net » Apache commons net 1.4.1 » org.apache.commons.net.io 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 2001-2005 The Apache Software Foundation
003:         *
004:         * Licensed under the Apache License, Version 2.0 (the "License");
005:         * you may not use this file except in compliance with the License.
006:         * You may obtain a copy of the License at
007:         *
008:         *     http://www.apache.org/licenses/LICENSE-2.0
009:         *
010:         * Unless required by applicable law or agreed to in writing, software
011:         * distributed under the License is distributed on an "AS IS" BASIS,
012:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013:         * See the License for the specific language governing permissions and
014:         * limitations under the License.
015:         */
016:        package org.apache.commons.net.io;
017:
018:        import java.util.Enumeration;
019:        import org.apache.commons.net.util.ListenerList;
020:
021:        /**
022:         * The CopyStreamAdapter will relay CopyStreamEvents to a list of listeners
023:         * when either of its bytesTransferred() methods are called.  Its purpose
024:         * is to facilitate the notification of the progress of a copy operation
025:         * performed by one of the static copyStream() methods in
026:         * org.apache.commons.io.Util to multiple listeners.  The static
027:         * copyStream() methods invoke the
028:         * bytesTransfered(long, int) of a CopyStreamListener for performance
029:         * reasons and also because multiple listeners cannot be registered given
030:         * that the methods are static.
031:         * <p>
032:         * <p>
033:         * @see CopyStreamEvent
034:         * @see CopyStreamListener
035:         * @see Util
036:         * @author <a href="mailto:savarese@apache.org">Daniel F. Savarese</a>
037:         * @version $Id: CopyStreamAdapter.java 165675 2005-05-02 20:09:55Z rwinston $
038:         */
039:        public class CopyStreamAdapter implements  CopyStreamListener {
040:            private ListenerList internalListeners;
041:
042:            /**
043:             * Creates a new copyStreamAdapter.
044:             */
045:            public CopyStreamAdapter() {
046:                internalListeners = new ListenerList();
047:            }
048:
049:            /**
050:             * This method is invoked by a CopyStreamEvent source after copying
051:             * a block of bytes from a stream.  The CopyStreamEvent will contain
052:             * the total number of bytes transferred so far and the number of bytes
053:             * transferred in the last write.  The CopyStreamAdapater will relay
054:             * the event to all of its registered listeners, listing itself as the
055:             * source of the event.
056:             * @param event The CopyStreamEvent fired by the copying of a block of
057:             *              bytes.
058:             */
059:            public void bytesTransferred(CopyStreamEvent event) {
060:                bytesTransferred(event.getTotalBytesTransferred(), event
061:                        .getBytesTransferred(), event.getStreamSize());
062:            }
063:
064:            /**
065:             * This method is not part of the JavaBeans model and is used by the
066:             * static methods in the org.apache.commons.io.Util class for efficiency.
067:             * It is invoked after a block of bytes to inform the listener of the
068:             * transfer.  The CopyStreamAdapater will create a CopyStreamEvent
069:             * from the arguments and relay the event to all of its registered
070:             * listeners, listing itself as the source of the event.
071:             * @param totalBytesTransferred  The total number of bytes transferred
072:             *         so far by the copy operation.
073:             * @param bytesTransferred  The number of bytes copied by the most recent
074:             *          write.
075:             * @param streamSize The number of bytes in the stream being copied.
076:             *        This may be equal to CopyStreamEvent.UNKNOWN_STREAM_SIZE if
077:             *        the size is unknown.
078:             */
079:            public void bytesTransferred(long totalBytesTransferred,
080:                    int bytesTransferred, long streamSize) {
081:                Enumeration listeners;
082:                CopyStreamEvent event;
083:
084:                listeners = internalListeners.getListeners();
085:
086:                event = new CopyStreamEvent(this , totalBytesTransferred,
087:                        bytesTransferred, streamSize);
088:
089:                while (listeners.hasMoreElements()) {
090:                    ((CopyStreamListener) (listeners.nextElement()))
091:                            .bytesTransferred(event);
092:                }
093:            }
094:
095:            /**
096:             * Registers a CopyStreamListener to receive CopyStreamEvents.
097:             * Although this method is not declared to be synchronized, it is
098:             * implemented in a thread safe manner.
099:             * @param listener  The CopyStreamlistener to register.
100:             */
101:            public void addCopyStreamListener(CopyStreamListener listener) {
102:                internalListeners.addListener(listener);
103:            }
104:
105:            /**
106:             * Unregisters a CopyStreamListener.  Although this method is not
107:             * synchronized, it is implemented in a thread safe manner.
108:             * @param listener  The CopyStreamlistener to unregister.
109:             */
110:            public void removeCopyStreamListener(CopyStreamListener listener) {
111:                internalListeners.removeListener(listener);
112:            }
113:        }
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