DeflateIntegerIterator.java

/**
 * File: $HeadURL: https://hdt-java.googlecode.com/svn/trunk/hdt-java/src/org/rdfhdt/hdt/compact/sequence/DeflateIntegerIterator.java $
 * Revision: $Rev: 191 $
 * Last modified: $Date: 2013-03-03 11:41:43 +0000 (dom, 03 mar 2013) $
 * Last modified by: $Author: mario.arias $
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * Contacting the authors:
 *   Mario Arias:               mario.arias@deri.org
 *   Javier D. Fernandez:       jfergar@infor.uva.es
 *   Miguel A. Martinez-Prieto: migumar2@infor.uva.es
 *   Alejandro Andres:          fuzzy.alej@gmail.com
 */

package org.rdfhdt.hdt.compact.sequence;

import java.io.ByteArrayInputStream;
import java.io.DataInputStream;
import java.io.IOException;
import java.util.List;
import java.util.Iterator;
import java.util.zip.InflaterInputStream;

/**
 * @author mck
 *
 */
public class DeflateIntegerIterator implements Iterator<Integer> {

	protected List<byte[]> buffer;
	protected DataInputStream stream;
	int current, next;
	
	public DeflateIntegerIterator(List<byte[]> buffer) {
		this.buffer = buffer;
	}
	
	public void reset(long list) {
		byte [] buf = buffer.get((int)list);
		try {
			stream = new DataInputStream(
										new InflaterInputStream(
//					new SnappyInputStream(
							new ByteArrayInputStream(buf)
					)
			);


			try {
				current = stream.readInt();
				System.out.println("First: "+current);
				if(current==-1) {
					return;
				}
			} catch (IOException e) {
				current = -1;
			}

			try {
				int val = stream.readInt();
				System.out.println("Second: "+val);
				next = val!=-1 ? current + val : -1;
			} catch (IOException e) {
				next = -1;
			}
		} catch (Exception e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}
	}
	
	/* (non-Javadoc)
	 * @see java.util.Iterator#hasNext()
	 */
	@Override
	public boolean hasNext() {
		return current!=-1;
	}
	
	/* (non-Javadoc)
	 * @see java.util.Iterator#next()
	 */
	@Override
	public Integer next() {
		int aux = current;
		current = next;
		
		try {
			int val = stream.readInt();
			next = val!=-1 ? current + val : -1;
		} catch (IOException e) {
			next = -1;
		}
		
		return aux;
	}
	
	/* (non-Javadoc)
	 * @see java.util.Iterator#remove()
	 */
	@Override
	public void remove() {
		throw new UnsupportedOperationException();
	}
	

}