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javaxdelta - Patch generator and patch tool using the GDIFF algorithm
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/*
 * RandomAccessFileSeekableSource.java
 *
 * Created on May 17, 2006, 1:45 PM
 * Copyright (c) 2006 Heiko Klein
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in 
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 *
 *
 */

package com.nothome.delta;

import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.ByteBuffer;

/**
 * Wraps a random access file.
 */
public class RandomAccessFileSeekableSource implements SeekableSource {
    
    /** The raf. */
    private RandomAccessFile raf;

    /**
     * Constructs a new RandomAccessFileSeekableSource.
     *
     * @param raf the raf
     */
    public RandomAccessFileSeekableSource(RandomAccessFile raf) {
        if (raf == null)
            throw new NullPointerException("raf");
        this.raf = raf;
    }

    /* (non-Javadoc)
     * @see com.nothome.delta.SeekableSource#seek(long)
     */
    @Override
	public void seek(long pos) throws IOException {
        raf.seek(pos);
    }

    /**
     * Read.
     *
     * @param b the b
     * @param off the off
     * @param len the len
     * @return the int
     * @throws IOException Signals that an I/O exception has occurred.
     */
    public int read(byte[] b, int off, int len) throws IOException {
        return raf.read(b, off, len);
    }

    /**
     * Length.
     *
     * @return the long
     * @throws IOException Signals that an I/O exception has occurred.
     */
    public long length() throws IOException {
        return raf.length();
    }

    /* (non-Javadoc)
     * @see java.io.Closeable#close()
     */
    @Override
	public void close() throws IOException {
        raf.close();
    }

    /* (non-Javadoc)
     * @see com.nothome.delta.SeekableSource#read(java.nio.ByteBuffer)
     */
    @Override
	public int read(ByteBuffer bb) throws IOException {
        int c = raf.read(bb.array(), bb.position(), bb.remaining());
        if (c == -1)
            return -1;
        bb.position(bb.position() + c);
        return c;
    }
    
}