/*
 	OrpheusMS: MapleStory Private Server based on OdinMS
    Copyright (C) 2012 Aaron Weiss <aaron@deviant-core.net>
    				Patrick Huy <patrick.huy@frz.cc>
					Matthias Butz <matze@odinms.de>
					Jan Christian Meyer <vimes@odinms.de>

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as
    published by the Free Software Foundation, either version 3 of the
    License, or (at your option) any later version.

    This program 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 Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package tools.data.input;

import java.io.IOException;
import tools.Output;

/**
 * Provides an abstract accessor to a generic Little Endian byte stream. This
 * accessor is seekable.
 * 
 * @author Frz
 * @version 1.0
 * @since Revision 323
 * @see tools.data.input.GenericLittleEndianAccessor
 */
public class GenericSeekableLittleEndianAccessor extends GenericLittleEndianAccessor implements SeekableLittleEndianAccessor {
	private SeekableInputStreamBytestream bs;

	/**
	 * Class constructor Provide a seekable input stream to wrap this object
	 * around.
	 * 
	 * @param bs
	 *            The byte stream to wrap this around.
	 */
	public GenericSeekableLittleEndianAccessor(SeekableInputStreamBytestream bs) {
		super(bs);
		this.bs = bs;
	}

	/**
	 * Seek the pointer to <code>offset</code>
	 * 
	 * @param offset
	 *            The offset to seek to.
	 * @see tools.data.input.SeekableInputStreamBytestream#seek
	 */
	@Override
	public void seek(long offset) {
		try {
			bs.seek(offset);
		} catch (IOException e) {
			Output.print("Seek failed " + e);
		}
	}

	/**
	 * Get the current position of the pointer.
	 * 
	 * @return The current position of the pointer as a long integer.
	 * @see tools.data.input.SeekableInputStreamBytestream#getPosition
	 */
	@Override
	public long getPosition() {
		try {
			return bs.getPosition();
		} catch (IOException e) {
			Output.print("getPosition failed" + e);
			return -1;
		}
	}

	/**
	 * Skip <code>num</code> number of bytes in the stream.
	 * 
	 * @param num
	 *            The number of bytes to skip.
	 */
	@Override
	public void skip(int num) {
		seek(getPosition() + num);
	}
}