SeekableByteChannelFileBasedImpl.java

/*
 * Copyright 2015 Red Hat, Inc. and/or its affiliates.
 *
 * 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 org.uberfire.java.nio.base;

import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;

import org.uberfire.java.nio.IOException;
import org.uberfire.java.nio.channels.SeekableByteChannel;

import static org.uberfire.commons.validation.Preconditions.checkNotNull;

/**
 *
 */
public class SeekableByteChannelFileBasedImpl
        implements SeekableByteChannel {

    private final FileChannel channel;

    public SeekableByteChannelFileBasedImpl(final FileChannel channel) {
        this.channel = checkNotNull("channel",
                                    channel);
    }

    @Override
    public long position() throws IOException {
        try {
            return channel.position();
        } catch (java.io.IOException e) {
            throw new IOException(e);
        }
    }

    @Override
    public SeekableByteChannel position(final long newPosition) throws IOException {
        try {
            channel.position(newPosition);
            return this;
        } catch (java.io.IOException e) {
            throw new IOException(e);
        }
    }

    @Override
    public long size() throws IOException {
        try {
            return channel.size();
        } catch (java.io.IOException e) {
            throw new IOException(e);
        }
    }

    @Override
    public SeekableByteChannel truncate(final long size) throws IOException {
        try {
            channel.truncate(size);
            return this;
        } catch (java.io.IOException e) {
            throw new IOException(e);
        }
    }

    @Override
    public int read(final ByteBuffer dst) throws java.io.IOException {
        try {
            return channel.read(dst);
        } catch (java.io.IOException e) {
            throw new IOException(e);
        }
    }

    @Override
    public int write(final ByteBuffer src) throws java.io.IOException {
        try {
            return channel.write(src);
        } catch (java.io.IOException e) {
            throw new IOException(e);
        }
    }

    @Override
    public boolean isOpen() {
        return channel.isOpen();
    }

    @Override
    public void close() throws java.io.IOException {
        try {
            channel.close();
        } catch (java.io.IOException e) {
            throw new IOException(e);
        }
    }
}