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Commons Net example source code file (CopyStreamListener.java)

This example Commons Net source code file (CopyStreamListener.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Commons Net tags/keywords

copystreamlistener, copystreamlistener, eventlistener, eventlistener, util

The Commons Net CopyStreamListener.java source code

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.commons.net.io;

import java.util.EventListener;

/**
 * The CopyStreamListener class can accept CopyStreamEvents to keep track
 * of the progress of a stream copying operation.  However, it is currently
 * not used that way within NetComponents for performance reasons.  Rather
 * the bytesTransferred(long, int) method is called directly rather than
 * passing an event to bytesTransferred(CopyStreamEvent), saving the creation
 * of a CopyStreamEvent instance.  Also, the only place where
 * CopyStreamListener is currently used within NetComponents is in the
 * static methods of the uninstantiable org.apache.commons.io.Util class, which
 * would preclude the use of addCopyStreamListener and
 * removeCopyStreamListener methods.  However, future additions may use the
 * JavaBean event model, which is why the hooks have been included from the
 * beginning.
 * <p>
 * <p>
 * @see CopyStreamEvent
 * @see CopyStreamAdapter
 * @see Util
 * @version $Id: CopyStreamListener.java 1088720 2011-04-04 18:52:00Z dfs $
 */
public interface CopyStreamListener extends EventListener
{
    /**
     * 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.
     * @param event The CopyStreamEvent fired by the copying of a block of
     *              bytes.
     */
    public void bytesTransferred(CopyStreamEvent event);


    /**
     * This method is not part of the JavaBeans model and is used by the
     * static methods in the org.apache.commons.io.Util class for efficiency.
     * It is invoked after a block of bytes to inform the listener of the
     * transfer.
     * @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);
}

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