/*
* Redberry: symbolic tensor computations.
*
* Copyright (c) 2010-2013:
* 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.core.tensor;
import cc.redberry.core.indexgenerator.IndexGenerator;
import cc.redberry.core.indexgenerator.IndexGeneratorFromData;
import cc.redberry.core.utils.TensorUtils;
import gnu.trove.set.hash.TIntHashSet;
/**
* @author Dmitry Bolotin
* @author Stanislav Poslavsky
*/
final class FactorNode {
final Tensor factor;
private final TensorBuilder builder;
int[] factorForbiddenIndices;
FactorNode(Tensor factor, TensorBuilder builder) {
this.factor = ApplyIndexMapping.optimizeDummies(factor);
this.builder = builder;
factorForbiddenIndices = TensorUtils.getAllIndicesNamesT(this.factor).toArray();
}
private FactorNode(Tensor factor, TensorBuilder builder, int[] factorForbiddenIndices) {
this.factor = factor;
this.builder = builder;
this.factorForbiddenIndices = factorForbiddenIndices;
}
void put(Tensor summand, Tensor factor) {
TIntHashSet allowed = TensorUtils.getAllDummyIndicesT(factor);
allowed.removeAll(factorForbiddenIndices);
//old variant
//IndexGenerator ig = new IndexGeneratorFromData(TensorUtils.getAllDummyIndicesT(factor).toArray());
summand = ApplyIndexMapping.renameDummy(summand, factorForbiddenIndices, allowed.toArray());
builder.put(summand);
}
Tensor build() {
return builder.build();
}
@Override
public FactorNode clone() {
//factorForbiddenIndices are immuable
return new FactorNode(factor, builder.clone(), factorForbiddenIndices);
}
}