cc.redberry.transformation.substitutions.AbstractSubstitution 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.substitutions;

import cc.redberry.core.context.CC;
import cc.redberry.core.tensor.Tensor;
import cc.redberry.transformation.Transformation;

/**
 *
 * @author Dmitry Bolotin
 * @author Stanislav Poslavsky
 */
public abstract class AbstractSubstitution implements Transformation {
    protected final T from;
    protected final Tensor to;
    protected final boolean allowDiffStates;

    public AbstractSubstitution(T from, Tensor to, boolean allowDiffStates) {
        this.from = from;
        this.to = to;
        this.allowDiffStates = allowDiffStates;

        //consistent substitution check
        if (!from.getIndices().getFreeIndices().equalsIgnoreOrder(to.getIndices().getFreeIndices())) {
            throw new SubstitutionException("Inconsistent substitution: not similar indices!");
        }
    }

    public AbstractSubstitution(T from, Tensor to) {
        this(from, to, CC.withMetric());
    }

    protected abstract Class getFromClasss();
}