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// Copyright 2014 Google Inc. All rights reserved.
//
// 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 com.google.devtools.build.lib.util.io;
import java.io.Closeable;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintStream;
import java.io.PrintWriter;
/**
* A pair of output streams to be used for redirecting the output and error
* streams of a subprocess.
*/
public class OutErr implements Closeable {
private final OutputStream out;
private final OutputStream err;
public static final OutErr SYSTEM_OUT_ERR = create(System.out, System.err);
/**
* Creates a new OutErr instance from the specified output and error streams.
*/
public static OutErr create(OutputStream out, OutputStream err) {
return new OutErr(out, err);
}
protected OutErr(OutputStream out, OutputStream err) {
this.out = out;
this.err = err;
}
@Override
public void close() throws IOException {
out.close();
if (out != err) {
err.close();
}
}
/**
* This method redirects {@link System#out} / {@link System#err} into
* {@code this} object. After calling this method, writing to
* {@link System#out} or {@link System#err} will result in
* {@code "System.out: " + message} or {@code "System.err: " + message}
* being written to the OutputStreams of {@code this} instance.
*
* Note: This method affects global variables.
*/
public void addSystemOutErrAsSource() {
System.setOut(new PrintStream(new LinePrefixingOutputStream("System.out: ", getOutputStream()),
/*autoflush=*/false));
System.setErr(new PrintStream(new LinePrefixingOutputStream("System.err: ", getErrorStream()),
/*autoflush=*/false));
}
/**
* Creates a new OutErr instance from the specified stream.
* Writes to either the output or err of the new OutErr are written
* to outputStream, synchronized.
*/
public static OutErr createSynchronizedFunnel(final OutputStream outputStream) {
OutputStream syncOut = new OutputStream() {
@Override
public synchronized void write(int b) throws IOException {
outputStream.write(b);
}
@Override
public synchronized void write(byte b[]) throws IOException {
outputStream.write(b);
}
@Override
public synchronized void write(byte b[], int off, int len) throws IOException {
outputStream.write(b, off, len);
}
@Override
public synchronized void flush() throws IOException {
outputStream.flush();
}
@Override
public synchronized void close() throws IOException {
outputStream.close();
}
};
return create(syncOut, syncOut);
}
public OutputStream getOutputStream() {
return out;
}
public OutputStream getErrorStream() {
return err;
}
/**
* Writes the specified string to the output stream, and flushes.
*/
public void printOut(String s) {
PrintWriter writer = new PrintWriter(out, true);
writer.print(s);
writer.flush();
}
public void printOutLn(String s) {
printOut(s + "\n");
}
/**
* Writes the specified string to the error stream, and flushes.
*/
public void printErr(String s) {
PrintWriter writer = new PrintWriter(err, true);
writer.print(s);
writer.flush();
}
public void printErrLn(String s) {
printErr(s + "\n");
}
}
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