factorcondition.java

drools 一个开放源码的规则引擎

package org.drools.examples.primefactors;

/*
 * $Id: FactorCondition.java,v 1.4 2004/11/12 17:11:16 simon Exp $
 *
 * Copyright 2004-2004 (C) The Werken Company. All Rights Reserved.
 *
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 * ("Software"), with or without modification, are permitted provided that the
 * following conditions are met:
 *
 * 1. Redistributions of source code must retain copyright statements and
 * notices. Redistributions must also contain a copy of this document.
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 * from this Software without prior written permission of The Werken Company.
 * For written permission, please contact [e-mail].
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 * "drools" appear in their names without prior written permission of The Werken
 * Company. "drools" is a trademark of The Werken Company.
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 * 5. Due credit should be given to The Werken Company. (http://werken.com/)
 *
 * THIS SOFTWARE IS PROVIDED BY THE WERKEN COMPANY AND CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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import org.drools.rule.Declaration;
import org.drools.spi.Condition;
import org.drools.spi.Tuple;

public class FactorCondition implements Condition
{
    private final Declaration numberDecl;
    private final int prime;

    public FactorCondition(Declaration numberDecl, int prime)
    {
        this.numberDecl = numberDecl;
        this.prime = prime;
    }

    public boolean isAllowed(Tuple tuple)
    {
        return ( ( Number ) tuple.get( this.numberDecl ) ).getQuotient( ) % prime == 0;
    }

    public Declaration[] getRequiredTupleMembers()
    {
        return new Declaration[] { this.numberDecl };
    }

    public String toString()
    {
        return "Divisible by " + prime + "?";
    }
}