diff options
Diffstat (limited to 'jimfs/src/main/java/com/google/common/jimfs/JimfsOutputStream.java')
-rw-r--r-- | jimfs/src/main/java/com/google/common/jimfs/JimfsOutputStream.java | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/jimfs/src/main/java/com/google/common/jimfs/JimfsOutputStream.java b/jimfs/src/main/java/com/google/common/jimfs/JimfsOutputStream.java new file mode 100644 index 0000000..0b88046 --- /dev/null +++ b/jimfs/src/main/java/com/google/common/jimfs/JimfsOutputStream.java @@ -0,0 +1,116 @@ +/* + * 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; + } +} |