/*
 * Redberry: symbolic tensor computations.
 *
 * Copyright (c) 2010-2015:
 *   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.core.tensor;

import cc.redberry.core.number.Complex;

/**
 * Factory for sums.
 *
 * @author Dmitry Bolotin
 * @author Stanislav Poslavsky
 * @since 1.0
 */
public final class SumFactory implements TensorFactory {

    public static final SumFactory FACTORY = new SumFactory();

    private SumFactory() {
    }

    @Override
    public Tensor create(Tensor... tensors) {
        if (tensors.length == 0)
            return Complex.ZERO;
        if (tensors.length == 1)
            return tensors[0];
        TensorBuilder builder = new SumBuilder(tensors.length);
        for (Tensor t : tensors)
            builder.put(t);
        return builder.build();
    }
}