136 lines
3.8 KiB
Java
136 lines
3.8 KiB
Java
/**
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*
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* Copyright 2003-2007 Jive Software.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.jivesoftware.smack.util;
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import java.io.IOException;
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import java.io.Writer;
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import java.util.ArrayList;
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import java.util.List;
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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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private static final int MAX_STRING_BUILDER_SIZE = 4096;
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Writer wrappedWriter = null;
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final List<WriterListener> listeners = new ArrayList<WriterListener>();
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private final StringBuilder stringBuilder = new StringBuilder(MAX_STRING_BUILDER_SIZE);
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public ObservableWriter(Writer wrappedWriter) {
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this.wrappedWriter = wrappedWriter;
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}
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@Override
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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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maybeNotifyListeners(str);
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}
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@Override
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public void flush() throws IOException {
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notifyListeners();
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wrappedWriter.flush();
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}
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@Override
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public void close() throws IOException {
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wrappedWriter.close();
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}
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@Override
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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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@Override
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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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maybeNotifyListeners(str);
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}
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@Override
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public void write(String str) throws IOException {
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wrappedWriter.write(str);
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maybeNotifyListeners(str);
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}
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@Override
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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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maybeNotifyListeners(str);
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}
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private void maybeNotifyListeners(String s) {
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stringBuilder.append(s);
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if (stringBuilder.length() > MAX_STRING_BUILDER_SIZE) {
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notifyListeners();
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}
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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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private void notifyListeners() {
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WriterListener[] writerListeners;
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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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String str = stringBuilder.toString();
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stringBuilder.setLength(0);
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for (WriterListener writerListener : writerListeners) {
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writerListener.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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