/*
* Copyright (c) 2012, the Dart project authors.
*
* Licensed under the Eclipse Public License v1.0 (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.eclipse.org/legal/epl-v10.html
*
* 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 com.google.dart.tools.debug.core.util;
/**
* A class that can process new text input, send messages when new input is received, and maintains
* a buffer of the last 20,000 chars written.
*/
class ListeningStream {
public static interface StreamListener {
public void handleStreamData(String data);
}
private static final int MAX_SIZE = 20000;
private StringBuilder buffer = new StringBuilder();
private StreamListener listener;
public ListeningStream() {
}
public synchronized void appendData(String data) {
if (listener != null) {
listener.handleStreamData(data);
}
buffer.append(data);
if (buffer.length() > MAX_SIZE) {
int remove = buffer.length() - MAX_SIZE;
buffer.replace(0, remove, "");
}
}
public synchronized void setListener(StreamListener l) {
listener = l;
if (buffer.length() > 0) {
listener.handleStreamData(buffer.toString());
}
}
@Override
public String toString() {
return buffer.toString();
}
}