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/**
* $RCSfile$
* $Revision$
* $Date$
*
* Copyright 2003-2007 Jive Software.
*
* All rights reserved. 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
*
* 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.jivesoftware.smack.util;
import java.io.*;
import java.util.*;
/**
* An ObservableReader is a wrapper on a Reader that notifies to its listeners when
* reading character streams.
*
* @author Gaston Dombiak
*/
public class ObservableReader extends Reader {
Reader wrappedReader = null;
List<ReaderListener> listeners = new ArrayList<ReaderListener>();
public ObservableReader(Reader wrappedReader) {
this.wrappedReader = wrappedReader;
}
public int read(char[] cbuf, int off, int len) throws IOException {
int count = wrappedReader.read(cbuf, off, len);
if (count > 0) {
String str = new String(cbuf, off, count);
// Notify that a new string has been read
ReaderListener[] readerListeners = null;
synchronized (listeners) {
readerListeners = new ReaderListener[listeners.size()];
listeners.toArray(readerListeners);
}
for (int i = 0; i < readerListeners.length; i++) {
readerListeners[i].read(str);
}
}
return count;
}
public void close() throws IOException {
wrappedReader.close();
}
public int read() throws IOException {
return wrappedReader.read();
}
public int read(char cbuf[]) throws IOException {
return wrappedReader.read(cbuf);
}
public long skip(long n) throws IOException {
return wrappedReader.skip(n);
}
public boolean ready() throws IOException {
return wrappedReader.ready();
}
public boolean markSupported() {
return wrappedReader.markSupported();
}
public void mark(int readAheadLimit) throws IOException {
wrappedReader.mark(readAheadLimit);
}
public void reset() throws IOException {
wrappedReader.reset();
}
/**
* Adds a reader listener to this reader that will be notified when
* new strings are read.
*
* @param readerListener a reader listener.
*/
public void addReaderListener(ReaderListener readerListener) {
if (readerListener == null) {
return;
}
synchronized (listeners) {
if (!listeners.contains(readerListener)) {
listeners.add(readerListener);
}
}
}
/**
* Removes a reader listener from this reader.
*
* @param readerListener a reader listener.
*/
public void removeReaderListener(ReaderListener readerListener) {
synchronized (listeners) {
listeners.remove(readerListener);
}
}
}
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