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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.testrunner;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintStream;
import java.util.concurrent.atomic.AtomicReference;
/**
* Used to replace System.out and System.err, providing the ability to forward output to an additional sink.
*
* @author jonmv
*/
public class TeeStream extends OutputStream {
private final AtomicReference<OutputStream> tee = new AtomicReference<>();
private final OutputStream original;
private TeeStream(OutputStream original) {
this.original = original;
}
public static TeeStream ofSystemOut() {
TeeStream teed = new TeeStream(System.out);
System.setOut(new PrintStream(teed));
return teed;
}
public static TeeStream ofSystemErr() {
TeeStream teed = new TeeStream(System.err);
System.setErr(new PrintStream(teed));
return teed;
}
public void setTee(OutputStream tee) {
if ( ! this.tee.compareAndSet(null, tee)) throw new IllegalStateException("tee already set");
}
public OutputStream clearTee() {
OutputStream tee = this.tee.getAndSet(null);
if (tee == null) throw new IllegalStateException("tee not set");
return tee;
}
@Override
public void write(int b) throws IOException {
OutputStream maybe = tee.get();
if (maybe != null) maybe.write(b);
original.write(b);
}
@Override
public void write(byte[] b, int off, int len) throws IOException {
OutputStream maybe = tee.get();
if (maybe != null) maybe.write(b, off, len);
original.write(b, off, len);
}
@Override
public void flush() throws IOException {
OutputStream maybe = tee.get();
if (maybe != null) maybe.flush();
original.flush();
}
}
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