predicateutils.java

Mandarax是一个规则引擎的纯Java实现。它支持多类型的事实和基于反映的规则

package org.mandarax.util;

/*
 * Copyright (C) 1999-2004 <A href="http://www-ist.massey.ac.nz/JBDietrich" target="_top">Jens Dietrich</a>
 *
 * 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 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

import org.mandarax.kernel.Predicate;

/**
 * Utility to generate slot names for predicates.
 * @author <A href="http://www-ist.massey.ac.nz/JBDietrich" target="_top">Jens Dietrich</A>
 * @version 3.4 <7 March 05>
 * @since 3.0
 */

public class PredicateUtils {
	private static final String SLOT = "slot";
		/**
		 * Get the slot name for a predicate.
		 * @return a slot name
		 * @param predicate a predicate
		 * @param index an index
		 */
		public static String getSlotName(Predicate predicate,int index) {
			if (index>=predicate.getStructure().length) throw new IllegalArgumentException("Slot number " + index + " does not exist for predicate " + predicate);
			return SLOT+(index+1);
		}


		
}