bitvectorbooleaniterator.java

MG4J (Managing Gigabytes for Java) is a free full-text search engine for large document collections

package it.unimi.dsi.mg4j.util;

/*		 
* MG4J: Managing Gigabytes for Java
*
* Copyright (C) 2005-2007 Sebastiano Vigna 
*
*  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 program; if not, write to the Free Software
*  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
*/

import it.unimi.dsi.fastutil.booleans.AbstractBooleanListIterator;

import java.util.NoSuchElementException;

import cern.colt.bitvector.BitVector;

/** A boolean iterator returning the bits of a bit vector.
 * 
 * @deprecated Useless, since we now have the {@link it.unimi.dsi.bits.BitVector} implementations
 * in the <a href="http://dsiutils.dsi.unimi.it/">DSI utilities</a>.
 */

@Deprecated
public class BitVectorBooleanIterator extends AbstractBooleanListIterator {

	private final BitVector bitVector;
	int pos = 0;
	
	public BitVectorBooleanIterator( final BitVector bitVector ) {
		this.bitVector = bitVector;
	}
	
	public boolean previousBoolean() {
		if ( ! hasPrevious() ) throw new NoSuchElementException();
		return bitVector.get( --pos );
	}
	public boolean nextBoolean() {
		if ( ! hasNext() ) throw new NoSuchElementException();
		return bitVector.get( pos++ );
	}

	public int nextIndex() {
		return pos;
	}

	public int previousIndex() {
		return pos - 1;
	}

	public boolean hasNext() {
		return pos < bitVector.size();
	}

	public boolean hasPrevious() {
		return pos > 0;
	}

}