cc.redberry.transformation.contractions.UncontractIndicesAbstract 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.contractions;

import java.util.ArrayList;
import java.util.List;
import cc.redberry.core.indexgenerator.IndexGenerator;
import cc.redberry.core.tensor.Product;
import cc.redberry.core.tensor.Tensor;
import cc.redberry.transformation.Transformation;
import cc.redberry.core.utils.IntArrayList;

/**
 *
 * @author Dmitry Bolotin
 * @author Stanislav Poslavsky
 */
public abstract class UncontractIndicesAbstract implements Transformation {
    protected final List kroneckers = new ArrayList<>();
    protected final IntArrayList checked = new IntArrayList();
    final int[] forbidenSortedNames;
    IndexGenerator indexGenerator;

    public UncontractIndicesAbstract() {
        this.forbidenSortedNames = new int[0];
    }

    public UncontractIndicesAbstract(int[] forbidenSortedNames) {
        this.forbidenSortedNames = forbidenSortedNames;
    }

    public List getKroneckers() {
        return kroneckers;
    }

    @Override
    public Tensor transform(Tensor tensor) {
        Product result = new Product();
        result.add(renameIndicesAndBuidKroneckers(tensor));
        result.add(kroneckers);
        return result.equivalent();
    }

    public abstract Tensor renameIndicesAndBuidKroneckers(Tensor tensor);

    protected abstract IndexGenerator createIndexGenerator(Tensor tensor);
}