cassandra-trunk/test/unit/org/apache/cassandra/io/filesystem/ForwardingFileChannel.java
/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.cassandra.io.filesystem;

import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.channels.FileLock;
import java.nio.channels.ReadableByteChannel;
import java.nio.channels.WritableByteChannel;

public class ForwardingFileChannel extends FileChannel
{
    protected final FileChannel delegate;

    public ForwardingFileChannel(FileChannel delegate)
    {
        this.delegate = delegate;
    }

    protected FileChannel delegate()
    {
        return delegate;
    }

    @Override
    public int read(ByteBuffer dst) throws IOException
    {
        return delegate().read(dst);
    }

    @Override
    public long read(ByteBuffer[] dsts, int offset, int length) throws IOException
    {
        return delegate().read(dsts, offset, length);
    }

    @Override
    public int write(ByteBuffer src) throws IOException
    {
        return delegate().write(src);
    }

    @Override
    public long write(ByteBuffer[] srcs, int offset, int length) throws IOException
    {
        return delegate().write(srcs, offset, length);
    }

    @Override
    public long position() throws IOException
    {
        return delegate().position();
    }

    @Override
    public FileChannel position(long newPosition) throws IOException
    {
        return delegate().position(newPosition);
    }

    @Override
    public long size() throws IOException
    {
        return delegate().size();
    }

    @Override
    public FileChannel truncate(long size) throws IOException
    {
        return delegate().truncate(size);
    }

    @Override
    public void force(boolean metaData) throws IOException
    {
        delegate().force(metaData);
    }

    @Override
    public long transferTo(long position, long count, WritableByteChannel target) throws IOException
    {
        return delegate().transferTo(position, count, target);
    }

    @Override
    public long transferFrom(ReadableByteChannel src, long position, long count) throws IOException
    {
        return delegate().transferFrom(src, position, count);
    }

    @Override
    public int read(ByteBuffer dst, long position) throws IOException
    {
        return delegate().read(dst, position);
    }

    @Override
    public int write(ByteBuffer src, long position) throws IOException
    {
        return delegate().write(src, position);
    }

    @Override
    public MappedByteBuffer map(MapMode mode, long position, long size) throws IOException
    {
        return delegate().map(mode, position, size);
    }

    @Override
    public FileLock lock(long position, long size, boolean shared) throws IOException
    {
        return delegate().lock(position, size, shared);
    }

    @Override
    public FileLock tryLock(long position, long size, boolean shared) throws IOException
    {
        return delegate().tryLock(position, size, shared);
    }

    @Override
    protected void implCloseChannel() throws IOException
    {
        // .close(), and .isOpen() are "final", so need to leverage implCloseChannel
        // to close the underline channel
        delegate().close();
    }
}
