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rar decompression library in plain java

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/*
 * This file is part of seedbox .
 *
 * seedbox is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * seedbox is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with seedbox.  If not, see .
 */
package com.github.junrar.vfs2.provider.rar;

import java.io.IOException;

import org.apache.commons.vfs2.FileObject;
import org.apache.commons.vfs2.FileSystemException;
import org.apache.commons.vfs2.RandomAccessContent;
import org.apache.commons.vfs2.util.RandomAccessMode;

import com.github.junrar.Archive;
import com.github.junrar.Volume;
import com.github.junrar.io.IReadOnlyAccess;
import com.github.junrar.io.InputStreamReadOnlyAccessFile;


/**
 * @author Rogiel
 */
public class VFSVolume implements Volume {
	private final Archive archive;
	private final FileObject file;

	public VFSVolume(Archive archive, FileObject file) {
		this.archive = archive;
		this.file = file;
	}

	@Override
	public IReadOnlyAccess getReadOnlyAccess() throws IOException {
		IReadOnlyAccess input = null;
		try {
			RandomAccessContent rac = file.getContent().getRandomAccessContent(
					RandomAccessMode.READ);
			input = new RandomAccessContentAccess(rac);
		} catch (Exception e) {
			input = new InputStreamReadOnlyAccessFile(file.getContent()
					.getInputStream());
		}
		return input;
	}

	@Override
	public long getLength() {
		try {
			return file.getContent().getSize();
		} catch (FileSystemException e) {
			return -1;
		}
	}

	@Override
	public Archive getArchive() {
		return archive;
	}

	/**
	 * @return the file
	 */
	public FileObject getFile() {
		return file;
	}
}