doublearithmetictest13.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

/*
 * 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
 */
package test.org.mandarax.lib.math;


import org.mandarax.kernel.Fact;
import org.mandarax.lib.math.DoubleArithmetic;

/**
 * Test case for double arithmetic.<br>
 * <em>tested predicate(s): </em>DoubleArithmetic.EQUAL<br>
 * <em>tested function(s): </em>DoubleArithmetic.PLUS,DoubleArithmetic.TIMES,DoubleArithmetic.SQRT<br>
 * Note that we compute numbers satisfying the theorem of pythagoras!
 * @author <A href="http://www-ist.massey.ac.nz/JBDietrich" target="_top">Jens Dietrich</A>
 * @version 3.4 <7 March 05>
 * @since 1.6
 */
public class DoubleArithmeticTest13 extends DoubleArithmeticTest {

    /**
     * Constructor.
     */
    public DoubleArithmeticTest13() {
        super ();
    }

    /**
     * Get the expected number of generated facts.
     * @return the number of facts expected
     */
    protected int getExpected() {

        // pythag. numbers are 3,4,5 (4,3,5) and 6,8,10 (8,6,10)
        return 4;
    }

    /**
     * Get the query fact.
     * @return a query fact.
     */
    protected Fact getQueryFact() {

        // this is basically the theorem of pythagoras
        return buildFact (
            DoubleArithmetic.EQUAL, "x",
            buildComplexTerm (
                DoubleArithmetic.SQRT,
                buildComplexTerm (
                    DoubleArithmetic.PLUS,
                    buildComplexTerm (DoubleArithmetic.TIMES, "y", "y"),
                    buildComplexTerm (DoubleArithmetic.TIMES, "z", "z"))));
    }

    /**
     * Get the set of numbers used for testing.
     * @return an array of doubles
     */
    protected double[] getTestSet() {
        double[] array = {
            1, 2, 3, 4, 5, 6, 7, 8, 9, 10
        };

        return array;
    }
}