/*
* 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.Pow;
import cc.redberry.core.tensor.Tensor;
/**
*
* @author Dmitry Bolotin
* @author Stanislav Poslavsky
*/
class ProviderPowFactory implements IndexMappingProviderFactory {
static final ProviderPowFactory INSTANCE = new ProviderPowFactory();
private ProviderPowFactory() {
}
@Override
public IndexMappingProvider create(IndexMappingProvider opu, Tensor from, Tensor to, boolean allowDiffStates) {
final Pow fromP = (Pow) from, toP = (Pow) to;
if (IndexMappings.mappingExists(fromP.getPower(), toP.getPower(), allowDiffStates) && IndexMappings.mappingExists(fromP.getTarget(), toP.getTarget(), allowDiffStates))
return opu;
return IndexMappingProvider.Util.EMPTY_PROVIDER;
}
}