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diff --git a/app/src/main/java/org/apache/commons/net/io/CopyStreamAdapter.java b/app/src/main/java/org/apache/commons/net/io/CopyStreamAdapter.java
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+/*
+ * 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 org.apache.commons.net.util.ListenerList;
+
+import java.util.EventListener;
+
+/**
+ * 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
+ * org.apache.commons.io.Util 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.
+ * <p>
+ * <p>
+ * @see CopyStreamEvent
+ * @see CopyStreamListener
+ * @see Util
+ * @author <a href="mailto:savarese@apache.org">Daniel F. Savarese</a>
+ * @version $Id: CopyStreamAdapter.java 489397 2006-12-21 16:28:51Z rwinston $
+ */
+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 org.apache.commons.io.Util 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)
+    {
+        CopyStreamEvent event;
+
+        event = new CopyStreamEvent(this,
+                                    totalBytesTransferred,
+                                    bytesTransferred,
+                                    streamSize);
+
+        for (EventListener listener : internalListeners)
+        {
+            ((CopyStreamListener) (listener)).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);
+    }
+}