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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.Product;
import cc.redberry.core.tensor.Tensor;
import cc.redberry.core.tensor.TensorNumber;
import cc.redberry.core.tensor.testing.TTest;

/**
 *
 * @author Dmitry Bolotin
 * @author Stanislav Poslavsky
 */
public class ScalarsSplit extends Split {
    private final TensorNumber factoredNumber;
    private final boolean termIsOne;

    public ScalarsSplit(TensorNumber factoredNumber, Tensor term) {
        this.factoredNumber = factoredNumber.clone();
        this.term = term;
        termIsOne = false;
    }

    public ScalarsSplit(TensorNumber factoredNumber) {
        this.factoredNumber = factoredNumber.clone();
        this.term = TensorNumber.createONE();
        termIsOne = true;
    }

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

    @Override
    public void mergeFrom(ScalarsSplit split) {
        factoredNumber.add(split.factoredNumber);
    }

    @Override
    public Tensor tensorEquvivalent() {
        //TODO discover case, when factoredNumber == 0
        if (factoredNumber.isOne())
            return term;
        if (termIsOne)
            return factoredNumber;
        return new Product(factoredNumber, term);
    }
}