cc.redberry.core.indexmapping.ProviderComplex Maven / Gradle / Ivy

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/*
 * 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.indexmapping;

import cc.redberry.core.number.Complex;
import cc.redberry.core.tensor.Tensor;

/**
 * {@link Complex}-specific mapping provider.
 *
 * @author Dmitry Bolotin
 * @author Stanislav Poslavsky
 * @since 1.0
 */
final class ProviderComplex {

    public static final IndexMappingProviderFactory FACTORY = new IndexMappingProviderFactory() {

        @Override
        public IndexMappingProvider create(final IndexMappingProvider opu,
                                           final Tensor from,
                                           final Tensor to) {
            if (from.equals(to))
                if (((Complex) from).isZero())
                    return new PlusMinusIndexMappingProvider(opu);
                else
                    return new DummyIndexMappingProvider(opu);
            else if (from.equals(((Complex) to).negate()))
                return new MinusIndexMappingProvider(opu);
            return IndexMappingProvider.Util.EMPTY_PROVIDER;
        }
    };
}