mirror of
https://codeberg.org/Mercury-IM/Smack
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153 lines
4.9 KiB
Java
153 lines
4.9 KiB
Java
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/**
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* $RCSfile$
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* $Revision$
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* $Date$
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*
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* Copyright (C) 2002-2003 Jive Software. All rights reserved.
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* ====================================================================
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* The Jive Software License (based on Apache Software License, Version 1.1)
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. The end-user documentation included with the redistribution,
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* if any, must include the following acknowledgment:
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* "This product includes software developed by
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* Jive Software (http://www.jivesoftware.com)."
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* Alternately, this acknowledgment may appear in the software itself,
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* if and wherever such third-party acknowledgments normally appear.
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*
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* 4. The names "Smack" and "Jive Software" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please
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* contact webmaster@jivesoftware.com.
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*
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* 5. Products derived from this software may not be called "Smack",
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* nor may "Smack" appear in their name, without prior written
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* permission of Jive Software.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL JIVE SOFTWARE OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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* ====================================================================
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*/
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package org.jivesoftware.smack.util;
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import java.io.*;
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import java.util.*;
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/**
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* An ObservableWriter is a wrapper on a Writer that notifies to its listeners when
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* writing to character streams.
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*
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* @author Gaston Dombiak
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*/
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public class ObservableWriter extends Writer {
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Writer wrappedWriter = null;
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List listeners = new ArrayList();
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public ObservableWriter(Writer wrappedWriter) {
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this.wrappedWriter = wrappedWriter;
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}
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public void write(char cbuf[], int off, int len) throws IOException {
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wrappedWriter.write(cbuf, off, len);
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String str = new String(cbuf, off, len);
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notifyListeners(str);
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}
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public void flush() throws IOException {
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wrappedWriter.flush();
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}
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public void close() throws IOException {
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wrappedWriter.close();
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}
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public void write(int c) throws IOException {
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wrappedWriter.write(c);
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}
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public void write(char cbuf[]) throws IOException {
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wrappedWriter.write(cbuf);
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String str = new String(cbuf);
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notifyListeners(str);
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}
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public void write(String str) throws IOException {
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wrappedWriter.write(str);
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notifyListeners(str);
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}
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public void write(String str, int off, int len) throws IOException {
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wrappedWriter.write(str, off, len);
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str = str.substring(off, off + len);
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notifyListeners(str);
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}
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/**
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* Notify that a new string has been written.
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*
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* @param str the written String to notify
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*/
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private void notifyListeners(String str) {
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WriterListener[] writerListeners = null;
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synchronized (listeners) {
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writerListeners = new WriterListener[listeners.size()];
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listeners.toArray(writerListeners);
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}
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for (int i = 0; i < writerListeners.length; i++) {
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writerListeners[i].write(str);
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}
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}
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/**
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* Adds a writer listener to this writer that will be notified when
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* new strings are sent.
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*
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* @param writerListener a writer listener.
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*/
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public void addWriterListener(WriterListener writerListener) {
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if (writerListener == null) {
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return;
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}
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synchronized (listeners) {
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if (!listeners.contains(writerListener)) {
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listeners.add(writerListener);
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}
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}
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}
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/**
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* Removes a writer listener from this writer.
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*
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* @param writerListener a writer listener.
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*/
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public void removeWriterListener(WriterListener writerListener) {
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synchronized (listeners) {
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listeners.remove(writerListener);
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}
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}
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}
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