Package cc.redberry.transformation.substitutions

Source Code of cc.redberry.transformation.substitutions.TensorFieldSubstitution

/*
* 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.substitutions;

import cc.redberry.core.indices.Indices;
import cc.redberry.core.indices.IndicesUtils;
import cc.redberry.core.tensor.SimpleTensor;
import cc.redberry.core.tensor.Tensor;
import cc.redberry.core.tensor.TensorField;
import cc.redberry.core.indexmapping.IndexMappingDirect;

/**
*
* @author Dmitry Bolotin
* @author Stanislav Poslavsky
*/
public class TensorFieldSubstitution extends AbstractSimpleSubstitution<TensorField> {
    public TensorFieldSubstitution(TensorField from, Tensor to, boolean allowDiffStates) {
        super(from, to, allowDiffStates);
        for (Tensor arg : from)
            if (!(arg instanceof SimpleTensor))
                throw new SubstitutionException("Only simple tensors allowed as arguments of substituting fields");
    }

    public TensorFieldSubstitution(TensorField from, Tensor to) {
        this(from, to, false);
    }

    @Override
    protected Class getFromClasss() {
        return TensorField.class;
    }

    @Override
    protected Tensor getNewTo(TensorField current, TensorField from, Tensor to) {
        SimpleTensorSubstitution[] ssts = getArgumentsSubs(from, current);
        if (!allowDiffStates && ssts == null)
            return null;
        Tensor newTo = to.clone();
        for (SimpleTensorSubstitution sst : ssts)
            newTo = sst.transform(newTo);
        return newTo;
    }

    private SimpleTensorSubstitution[] getArgumentsSubs(final TensorField from, final TensorField current) {
        final SimpleTensorSubstitution[] argsSubstitutions =
                new SimpleTensorSubstitution[from.getArgs().length];
        Tensor argFrom, argCurrent;
        for (int i = 0; i < from.getArgs().length; ++i) {
            argFrom = from.getArgs()[i].clone();
            argCurrent = current.getArgs()[i];
            final Indices fromIndices = from.getArgIndices()[i];
            final Indices currentIndices = current.getArgIndices()[i];

            if (!allowDiffStates)
                for (int j = 0; j < fromIndices.size(); ++j)
                    if (IndicesUtils.getRawStateInt(fromIndices.get(j))
                            != IndicesUtils.getRawStateInt(currentIndices.get(j)))
                        return null;

            final IndexMappingDirect im = new IndexMappingDirect(fromIndices,
                    currentIndices);
            if (argFrom.getIndices().applyIndexMapping(im))
                argFrom.update();
            argsSubstitutions[i] =
                    new SimpleTensorSubstitution((SimpleTensor) argFrom, argCurrent, allowDiffStates);
        }
        return argsSubstitutions;
    }
}
TOP

Related Classes of cc.redberry.transformation.substitutions.TensorFieldSubstitution

TOP
Copyright © 2018 www.massapi.com. All rights reserved.
All source code are property of their respective owners. Java is a trademark of Sun Microsystems, Inc and owned by ORACLE Inc. Contact coftware#gmail.com.