/*
* Copyright 2013 the original author or authors.
*
* 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.spockframework.runtime;
import java.io.PrintStream;
import java.util.Set;
import java.util.concurrent.CopyOnWriteArraySet;
import org.spockframework.util.IStoppable;
import org.spockframework.util.StringMessagePrintStream;
import org.spockframework.util.TeePrintStream;
import org.spockframework.util.ThreadSafe;
@ThreadSafe
public class StandardStreamsCapturer implements IStoppable {
private final Set<IStandardStreamsListener> standardStreamsListeners =
new CopyOnWriteArraySet<IStandardStreamsListener>();
private volatile TeePrintStream outStream;
private volatile TeePrintStream errStream;
public synchronized void start() {
startCapture(System.out, outStream, true);
startCapture(System.err, errStream, false);
}
private void startCapture(PrintStream originalStream, TeePrintStream teeStream, final boolean isOut) {
if (originalStream == teeStream) return;
if (teeStream != null) {
teeStream.stopDelegation();
}
StringMessagePrintStream notifyingStream = new StringMessagePrintStream() {
@Override
protected void printed(String message) {
for (IStandardStreamsListener listener : standardStreamsListeners) {
if (isOut) {
listener.standardOut(message);
} else {
listener.standardErr(message);
}
}
}
};
teeStream = new TeePrintStream(originalStream, notifyingStream);
if (isOut) {
outStream = teeStream;
System.setOut(teeStream);
} else {
errStream = teeStream;
System.setErr(teeStream);
}
}
public synchronized void stop() {
stopCapture(System.out, outStream, true);
stopCapture(System.err, errStream, false);
}
private void stopCapture(PrintStream originalStream, TeePrintStream teeStream, boolean isOut) {
if (originalStream != teeStream) return;
if (isOut) {
System.setOut(teeStream.getDelegates().get(0));
} else {
System.setErr(teeStream.getDelegates().get(0));
}
}
public void addStandardStreamsListener(IStandardStreamsListener listener) {
standardStreamsListeners.add(listener);
}
public void removeStandardStreamsListener(IStandardStreamsListener listener) {
standardStreamsListeners.remove(listener);
}
}