cc.redberry.transformation.collect.EqualsSplit 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.collect;

import cc.redberry.core.tensor.Sum;
import cc.redberry.core.tensor.Tensor;
import cc.redberry.core.tensor.testing.TTest;
import cc.redberry.transformation.Transformations;

/**
 *
 * @author Dmitry Bolotin
 * @author Stanislav Poslavsky
 */
public class EqualsSplit extends Split {
    private final Tensor factoredOut;
    private final Sum factors = new Sum();
    
    public EqualsSplit(Tensor factoredOut, Tensor term) {
        this.factoredOut = factoredOut.clone();
        this.term = term;
        factors.add(factoredOut);
    }

    @Override
    public boolean canMerge(EqualsSplit split) {
        return TTest.testParity(term, split.term);
    }

    @Override
    public void mergeFrom(EqualsSplit split) {
        factors.add(split.factoredOut);
    }

    @Override
    public Tensor tensorEquvivalent() {
//        if (term instanceof TensorNumber)
//            return factors.equivalent();
//        if (factoredOut instanceof TensorNumber && ((TensorNumber) factoredOut).isOne())
//            return term.equivalent();
//        return new Product(Transformations.calculateNumbers(factors), term);
        return pairProduct(Transformations.calculateNumbers(factors), term);
    }
}