/*
* 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.transformation.substitutions;
import cc.redberry.core.tensor.Expression;
import cc.redberry.core.tensor.Tensor;
import cc.redberry.core.indexmapping.IndexMappingImpl;
import cc.redberry.core.indexmapping.IndexMappingBuffer;
import cc.redberry.core.indexmapping.IndexMappings;
import cc.redberry.transformation.Transformation;
import cc.redberry.transformation.Transformer;
/**
*
* @author Dmitry Bolotin
* @author Stanislav Poslavsky
*/
public class NaiveSubstitution extends AbstractSubstitution<Tensor> {
private NaiveSubstitution(Expression expr) {
super(expr.left(), expr.right(), false);
}
private NaiveSubstitution(Tensor from, Tensor to) {
super(from, to, false);
}
@Override
protected Class getFromClasss() {
return from.getClass();
}
@Override
public Tensor transform(Tensor tensor) {
IndexMappingBuffer im = IndexMappings.getFirst(from, tensor, false);
if (im == null)
return tensor;
Tensor newTo = to.clone();
(new IndexMappingImpl(new int[0],im)).apply(newTo);
return newTo;
}
public static Transformation create(Expression expr) {
return new Transformer(new NaiveSubstitution(expr));
}
}