/*
* 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.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<Tensor> 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<Tensor> 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);
}