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// Copyright 2014 The Bazel Authors. 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.shell;
import static com.google.common.base.Preconditions.checkNotNull;
import java.io.ByteArrayOutputStream;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Encapsulates the results of a command execution, including exit status
* and output to stdout and stderr.
*/
public final class CommandResult {
private static final Logger log =
Logger.getLogger("com.google.devtools.build.lib.shell.Command");
private static final byte[] NO_BYTES = new byte[0];
static final ByteArrayOutputStream EMPTY_OUTPUT =
new ByteArrayOutputStream() {
@Override
public byte[] toByteArray() {
return NO_BYTES;
}
};
static final ByteArrayOutputStream NO_OUTPUT_COLLECTED =
new ByteArrayOutputStream(){
@Override
public byte[] toByteArray() {
throw new IllegalStateException("Output was not collected");
}
};
private final ByteArrayOutputStream stdout;
private final ByteArrayOutputStream stderr;
private final TerminationStatus terminationStatus;
CommandResult(final ByteArrayOutputStream stdout,
final ByteArrayOutputStream stderr,
final TerminationStatus terminationStatus) {
checkNotNull(stdout);
checkNotNull(stderr);
checkNotNull(terminationStatus);
this.stdout = stdout;
this.stderr = stderr;
this.terminationStatus = terminationStatus;
}
/**
* @return raw bytes that were written to stdout by the command, or
* null if caller did chose to ignore output
* @throws IllegalStateException if output was not collected
*/
public byte[] getStdout() {
return stdout.toByteArray();
}
/**
* @return raw bytes that were written to stderr by the command, or
* null if caller did chose to ignore output
* @throws IllegalStateException if output was not collected
*/
public byte[] getStderr() {
return stderr.toByteArray();
}
/**
* @return the termination status of the subprocess.
*/
public TerminationStatus getTerminationStatus() {
return terminationStatus;
}
void logThis() {
if (!log.isLoggable(Level.FINER)) {
return;
}
log.finer(terminationStatus.toString());
if (stdout == NO_OUTPUT_COLLECTED) {
return;
}
log.finer("Stdout: " + LogUtil.toTruncatedString(stdout.toByteArray()));
log.finer("Stderr: " + LogUtil.toTruncatedString(stderr.toByteArray()));
}
}
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