/*
* 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.integral;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import cc.redberry.core.tensor.Integral;
import cc.redberry.core.tensor.Product;
import cc.redberry.core.tensor.SimpleTensor;
import cc.redberry.core.tensor.Tensor;
import cc.redberry.core.tensor.TensorIterator;
import cc.redberry.transformation.Transformation;
/**
*
* @author Dmitry Bolotin
* @author Stanislav Poslavsky
*/
public class MergeIntegrals implements Transformation {
@Override
public Tensor transform(final Tensor tensor) {
if (tensor instanceof Integral)
return tensor;
if (!(tensor instanceof Product))
return tensor;
final TensorIterator iterator = tensor.iterator();
Tensor current;
final List<Integral> integrals = new ArrayList<>();
while (iterator.hasNext()) {
current = iterator.next();
if (current instanceof Integral) {
integrals.add((Integral) current);
iterator.remove();
}
}
((Product) tensor).add(mergeIntegrals(integrals));
return tensor.equivalent();
}
public static Tensor mergeIntegrals(List<Integral> integrals) {
final List<Map<Integer, SimpleTensor>> vars = new ArrayList<>();
for (final Integral i : integrals) {
final Map<Integer, SimpleTensor> map = new HashMap<>();
for (final SimpleTensor s : i.vars())
map.put(s.getName(), s);
vars.add(map);
}
return null;
}
}