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/*
* Copyright 2014 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 java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.channels.SeekableByteChannel;
/**
* A thin wrapper around a {@link FileChannel} that exists only to implement {@link
* SeekableByteChannel} but NOT extend {@link FileChannel}.
*
* @author Colin Decker
*/
final class DowngradedSeekableByteChannel implements SeekableByteChannel {
private final FileChannel channel;
DowngradedSeekableByteChannel(FileChannel channel) {
this.channel = checkNotNull(channel);
}
@Override
public int read(ByteBuffer dst) throws IOException {
return channel.read(dst);
}
@Override
public int write(ByteBuffer src) throws IOException {
return channel.write(src);
}
@Override
public long position() throws IOException {
return channel.position();
}
@Override
public SeekableByteChannel position(long newPosition) throws IOException {
channel.position(newPosition);
return this;
}
@Override
public long size() throws IOException {
return channel.size();
}
@Override
public SeekableByteChannel truncate(long size) throws IOException {
channel.truncate(size);
return this;
}
@Override
public boolean isOpen() {
return channel.isOpen();
}
@Override
public void close() throws IOException {
channel.close();
}
}
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