127 lines
3.4 KiB
Java
127 lines
3.4 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.Reader;
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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 ObservableReader is a wrapper on a Reader that notifies to its listeners when
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* reading character streams.
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*
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* @author Gaston Dombiak
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*/
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public class ObservableReader extends Reader {
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Reader wrappedReader = null;
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final List<ReaderListener> listeners = new ArrayList<ReaderListener>();
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public ObservableReader(Reader wrappedReader) {
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this.wrappedReader = wrappedReader;
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}
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@Override
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public int read(char[] cbuf, int off, int len) throws IOException {
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int count = wrappedReader.read(cbuf, off, len);
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if (count > 0) {
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String str = new String(cbuf, off, count);
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// Notify that a new string has been read
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ReaderListener[] readerListeners = null;
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synchronized (listeners) {
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readerListeners = new ReaderListener[listeners.size()];
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listeners.toArray(readerListeners);
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}
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for (int i = 0; i < readerListeners.length; i++) {
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readerListeners[i].read(str);
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}
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}
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return count;
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}
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@Override
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public void close() throws IOException {
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wrappedReader.close();
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}
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@Override
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public int read() throws IOException {
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return wrappedReader.read();
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}
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@Override
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public int read(char[] cbuf) throws IOException {
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return wrappedReader.read(cbuf);
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}
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@Override
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public long skip(long n) throws IOException {
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return wrappedReader.skip(n);
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}
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@Override
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public boolean ready() throws IOException {
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return wrappedReader.ready();
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}
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@Override
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public boolean markSupported() {
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return wrappedReader.markSupported();
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}
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@Override
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public void mark(int readAheadLimit) throws IOException {
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wrappedReader.mark(readAheadLimit);
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}
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@Override
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public void reset() throws IOException {
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wrappedReader.reset();
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}
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/**
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* Adds a reader listener to this reader that will be notified when
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* new strings are read.
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*
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* @param readerListener a reader listener.
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*/
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public void addReaderListener(ReaderListener readerListener) {
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if (readerListener == null) {
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return;
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}
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synchronized (listeners) {
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if (!listeners.contains(readerListener)) {
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listeners.add(readerListener);
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}
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}
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}
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/**
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* Removes a reader listener from this reader.
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*
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* @param readerListener a reader listener.
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*/
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public void removeReaderListener(ReaderListener readerListener) {
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synchronized (listeners) {
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listeners.remove(readerListener);
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}
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}
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}
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