/*
NeoDatis ODB : Native Object Database (odb.info@neodatis.org)
Copyright (C) 2007 NeoDatis Inc. http://www.neodatis.org

"This file is part of the NeoDatis ODB open source object database".

NeoDatis ODB 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.

NeoDatis ODB 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 Street, Fifth Floor, Boston, MA  02110-1301  USA
*/
package org.neodatis.odb.core.query.criteria;

import java.util.Iterator;


public class And extends ComposedExpression {

	public And() {
	}

	public boolean match(Object object) {
		Iterator iterator = criteria.iterator();

		ICriterion criterion = null;
		while (iterator.hasNext()) {
			criterion = (ICriterion) iterator.next();

			// For AND Expression, if one is false, then the whole
			// expression will be false
			if (!criterion.match(object)) {
				return false;
			}
		}
		return true;
	}

	public String toString() {
		StringBuffer buffer = new StringBuffer();
		Iterator iterator = criteria.iterator();
		;
		ICriterion criterion = null;
		buffer.append("(");
		boolean isFirst = true;
		while (iterator.hasNext()) {
			criterion = (ICriterion) iterator.next();
			if (isFirst) {
				buffer.append(criterion.toString());
				isFirst = false;
			} else {
				buffer.append(" and ").append(criterion.toString());
			}
		}
		buffer.append(")");
		return buffer.toString();
	}

	public boolean canUseIndex() {
		Iterator iterator = criteria.iterator();;
		ICriterion criterion = null;
		
		while(iterator.hasNext()){
			criterion = (ICriterion) iterator.next();
			if(!criterion.canUseIndex()){
				return false;
			}
		}
		return true;
	}

	

	
}