DistributedVector.cpp

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*/

#include "DistributedVector.hpp"
#include "DistributedVectorFactory.hpp"

bool DistributedVector::IsGlobalIndexLocal(unsigned globalIndex)
{
    return (mLo<=globalIndex && globalIndex<mHi);
}

DistributedVector::DistributedVector(Vec vec, DistributedVectorFactory* pFactory, bool readOnly)
    : mVec(vec),
      mpFactory(pFactory),
      mReadOnly(readOnly)
{
    assert(pFactory != nullptr);

    // Set local copies of problem size, etc.
    mProblemSize = pFactory->GetProblemSize();
    mLo = pFactory->GetLow();
    mHi = pFactory->GetHigh();

    if (mReadOnly)
    {
#if (PETSC_VERSION_MAJOR == 3 && PETSC_VERSION_MINOR >= 2) //PETSc 3.2 or later
        // Request read-only access properly
        VecGetArrayRead(vec, (const PetscScalar**)&mpVec);
#else
        // Silently ignore the request and hope nothing breaks
        VecGetArray(vec, &mpVec);
#endif
    }
    else
    {
        VecGetArray(vec, &mpVec);
    }

    // Set mSizeMultiplier by reading the vec size.
    PetscInt size;
    VecGetSize(vec, &size);
    mSizeMultiplier = (unsigned) size / mProblemSize;
    assert ((mSizeMultiplier * mProblemSize) == (unsigned)size);
}

double& DistributedVector::operator[](unsigned globalIndex)
{
    assert(mSizeMultiplier == 1);
    if (mLo<=globalIndex && globalIndex<mHi)
    {
        return mpVec[globalIndex - mLo];
    }
    throw DistributedVectorException();
}

double& DistributedVector::operator[](Iterator index)
{
    assert(mSizeMultiplier==1);
    return mpVec[index.Local];
}

void DistributedVector::Restore()
{
    assert(mReadOnly == false);
    VecRestoreArray(mVec, &mpVec);

#if (PETSC_VERSION_MAJOR == 3 && PETSC_VERSION_MINOR >= 2) //PETSc 3.2 or later

    VecGetArray(mVec, &mpVec);
#endif

}

// Iterator class

bool DistributedVector::Iterator::operator!=(const Iterator& rOther)
{
   return(Global != rOther.Global);
}

DistributedVector::Iterator& DistributedVector::Iterator::operator++()
{
    Local++;
    Global++;
    return(*this);
}

// Iterator creation

DistributedVector::Iterator DistributedVector::Begin()
{
    Iterator index;
    index.Local = 0;
    index.Global = mLo;
    return index;
}

DistributedVector::Iterator DistributedVector::End()
{
    Iterator index;
    index.Local = mHi-mLo;
    index.Global = mHi;
    return index;
}