/*
* 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.core.indexmapping;
import cc.redberry.core.tensor.Power;
import cc.redberry.core.tensor.Tensor;
/**
*
* @author Dmitry Bolotin
* @author Stanislav Poslavsky
*/
class ProviderPower implements IndexMappingProviderFactory {
static final ProviderPower INSTANCE = new ProviderPower();
private ProviderPower() {
}
@Override
public IndexMappingProvider create(IndexMappingProvider opu, Tensor from, Tensor to) {
final Power fromP = (Power) from, toP = (Power) to;
if (IndexMappings.mappingExists(fromP.get(1), toP.get(1)) && IndexMappings.mappingExists(fromP.get(0), toP.get(0)))
return new DummyIndexMappingProvider(opu);
return IndexMappingProvider.Util.EMPTY_PROVIDER;
}
}