cc.redberry.transformation.numbers.FractionToNumber Maven / Gradle / Ivy

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/*
 * Redberry: symbolic tensor computations.
 *
 * Copyright (c) 2010-2012:
 *   Stanislav Poslavsky   
 *   Bolotin Dmitriy       
 *
 * This file is part of Redberry.
 *
 * Redberry is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Redberry 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Redberry. If not, see .
 */
package cc.redberry.transformation.numbers;

import cc.redberry.core.tensor.Fraction;
import cc.redberry.core.tensor.Tensor;
import cc.redberry.core.tensor.TensorNumber;
import cc.redberry.transformation.Transformation;

/**
 *
 * @author Dmitry Bolotin
 * @author Stanislav Poslavsky
 */
public class FractionToNumber implements Transformation {
    public static final FractionToNumber INSTANCE = new FractionToNumber();

    private FractionToNumber() {
    }

    @Override
    public Tensor transform(Tensor tensor) {
        if (!(tensor instanceof Fraction))
            return tensor;
        Fraction fraction = (Fraction) tensor;
        if (fraction.getNumerator() instanceof TensorNumber
                && fraction.getDenominator() instanceof TensorNumber) {
            TensorNumber num = (TensorNumber) fraction.getNumerator();
            num.divide((TensorNumber) fraction.getDenominator());
            tensor = null;
            return num;
        }
        return tensor;
    }
}