Package cc.redberry.core.parser

Source Code of cc.redberry.core.parser.ParserProduct

/*
* Redberry: symbolic tensor computations.
*
* Copyright (c) 2010-2012:
*   Stanislav Poslavsky   <stvlpos@mail.ru>
*   Bolotin Dmitriy       <bolotin.dmitriy@gmail.com>
*
* 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 <http://www.gnu.org/licenses/>.
*/
package cc.redberry.core.parser;

import java.util.List;
import cc.redberry.core.tensor.Fraction;
import cc.redberry.core.tensor.Product;
import cc.redberry.core.tensor.Tensor;

/**
*
* @author Dmitry Bolotin
* @author Stanislav Poslavsky
*/
public class ParserProduct extends ParserOperator {
    public static final ParserProduct INSTANCE = new ParserProduct();
    private final static int parserID = 999;

    private ParserProduct() {
        super('*', '/');
    }

    @Override
    protected Tensor compile(List<Tensor> tensors) {
        if (tensors.isEmpty())
            throw new ParserException("Product parser get zero size array in complile(List<Tensor> tensors).");
        Tensor result = new Product(tensors);
        //consistent check
        result.getIndices();
        return result;
    }

    @Override
    protected void inverseOperation(Tensor tensor, List<Tensor> subTensors) {
        int size = subTensors.size();
        Fraction fraction = new Fraction(subTensors.get(size - 1), tensor);
        subTensors.set(size - 1, fraction);
    }

    @Override
    public int getPriority() {
        return parserID;
    }
}
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