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Diffstat (limited to 'src/org/jivesoftware/smack/util/ObservableWriter.java')
-rw-r--r-- | src/org/jivesoftware/smack/util/ObservableWriter.java | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/src/org/jivesoftware/smack/util/ObservableWriter.java b/src/org/jivesoftware/smack/util/ObservableWriter.java new file mode 100644 index 0000000..90cabb6 --- /dev/null +++ b/src/org/jivesoftware/smack/util/ObservableWriter.java @@ -0,0 +1,120 @@ +/** + * $RCSfile$ + * $Revision$ + * $Date$ + * + * 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 ObservableWriter is a wrapper on a Writer that notifies to its listeners when + * writing to character streams. + * + * @author Gaston Dombiak + */ +public class ObservableWriter extends Writer { + + Writer wrappedWriter = null; + List<WriterListener> listeners = new ArrayList<WriterListener>(); + + public ObservableWriter(Writer wrappedWriter) { + this.wrappedWriter = wrappedWriter; + } + + public void write(char cbuf[], int off, int len) throws IOException { + wrappedWriter.write(cbuf, off, len); + String str = new String(cbuf, off, len); + notifyListeners(str); + } + + public void flush() throws IOException { + wrappedWriter.flush(); + } + + public void close() throws IOException { + wrappedWriter.close(); + } + + public void write(int c) throws IOException { + wrappedWriter.write(c); + } + + public void write(char cbuf[]) throws IOException { + wrappedWriter.write(cbuf); + String str = new String(cbuf); + notifyListeners(str); + } + + public void write(String str) throws IOException { + wrappedWriter.write(str); + notifyListeners(str); + } + + public void write(String str, int off, int len) throws IOException { + wrappedWriter.write(str, off, len); + str = str.substring(off, off + len); + notifyListeners(str); + } + + /** + * Notify that a new string has been written. + * + * @param str the written String to notify + */ + private void notifyListeners(String str) { + WriterListener[] writerListeners = null; + synchronized (listeners) { + writerListeners = new WriterListener[listeners.size()]; + listeners.toArray(writerListeners); + } + for (int i = 0; i < writerListeners.length; i++) { + writerListeners[i].write(str); + } + } + + /** + * Adds a writer listener to this writer that will be notified when + * new strings are sent. + * + * @param writerListener a writer listener. + */ + public void addWriterListener(WriterListener writerListener) { + if (writerListener == null) { + return; + } + synchronized (listeners) { + if (!listeners.contains(writerListener)) { + listeners.add(writerListener); + } + } + } + + /** + * Removes a writer listener from this writer. + * + * @param writerListener a writer listener. + */ + public void removeWriterListener(WriterListener writerListener) { + synchronized (listeners) { + listeners.remove(writerListener); + } + } + +} |