LUSolver.h

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/* Copyright 2017 Kristofer Björnson
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef COM_DAFER45_TBTK_LU_SOLVER
#define COM_DAFER45_TBTK_LU_SOLVER

#include "TBTK/Communicator.h"
#include "TBTK/Matrix.h"
#include "TBTK/SparseMatrix.h"

#include <complex>

#include "slu_zdefs.h"

namespace TBTK{

class LUSolver : public Communicator{
public:
    enum class DataType {None, Double, ComplexDouble};

    LUSolver();

    ~LUSolver();

    void setMatrix(const SparseMatrix<double> &sparseMatrix);

    void setMatrix(const SparseMatrix<std::complex<double>> &sparseMatrix);

    DataType getMatrixDataType() const;

    void solve(Matrix<double> &b);

    void solve(Matrix<std::complex<double>> &b);
private:
    SuperMatrix *L;

    SuperMatrix *U;

    int *rowPermutations;

    int *columnPermutations;

    SuperLUStat_t *statistics;

    DataType matrixDataType;

    void allocatePermutationMatrices(
        unsigned int numRows,
        unsigned int numColumns
    );

    void initStatistics();

    void allocateLUMatrices();

    void initOptionsAndPermutationMatrices(
        superlu_options_t &options,
        SuperMatrix &matrix
    );

    void performLUFactorization(SuperMatrix &matrix);

    void checkSolveAssert(unsigned int numRows);

    void checkXgstrfErrors(
        int info,
        std::string functionName,
        int numColumns
    );

    void checkXgstrsErrors(int info, std::string functionName);
};

inline LUSolver::DataType LUSolver::getMatrixDataType() const{
    return matrixDataType;
}

};  //End of namespace TBTK

#endif