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/*
* Copyright 2013 Google Inc.
*
* 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.common.jimfs;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Preconditions.checkPositionIndexes;
import com.google.common.annotations.VisibleForTesting;
import java.io.IOException;
import java.io.OutputStream;
/**
* {@link OutputStream} for writing to a {@link RegularFile}.
*
* @author Colin Decker
*/
final class JimfsOutputStream extends OutputStream {
@GuardedBy("this")
@VisibleForTesting
RegularFile file;
@GuardedBy("this")
private long pos;
private final boolean append;
private final FileSystemState fileSystemState;
JimfsOutputStream(RegularFile file, boolean append, FileSystemState fileSystemState) {
this.file = checkNotNull(file);
this.append = append;
this.fileSystemState = fileSystemState;
fileSystemState.register(this);
}
@Override
public synchronized void write(int b) throws IOException {
checkNotClosed();
file.writeLock().lock();
try {
if (append) {
pos = file.sizeWithoutLocking();
}
file.write(pos++, (byte) b);
file.updateModifiedTime();
} finally {
file.writeLock().unlock();
}
}
@Override
public void write(byte[] b) throws IOException {
writeInternal(b, 0, b.length);
}
@Override
public void write(byte[] b, int off, int len) throws IOException {
checkPositionIndexes(off, off + len, b.length);
writeInternal(b, off, len);
}
private synchronized void writeInternal(byte[] b, int off, int len) throws IOException {
checkNotClosed();
file.writeLock().lock();
try {
if (append) {
pos = file.sizeWithoutLocking();
}
pos += file.write(pos, b, off, len);
file.updateModifiedTime();
} finally {
file.writeLock().unlock();
}
}
@GuardedBy("this")
private void checkNotClosed() throws IOException {
if (file == null) {
throw new IOException("stream is closed");
}
}
@Override
public synchronized void close() throws IOException {
if (isOpen()) {
fileSystemState.unregister(this);
file.closed();
// file is set to null here and only here
file = null;
}
}
@GuardedBy("this")
private boolean isOpen() {
return file != null;
}
}
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