DistributedVector.hpp

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*/


#ifndef DISTRIBUTEDVECTOR_HPP_
#define DISTRIBUTEDVECTOR_HPP_

#include <vector>
#include <petscvec.h>
#include <iostream>
#include <cassert>

#include "DistributedVectorException.hpp"

class DistributedVectorFactory;

class DistributedVector
{
private:
    friend class TestDistributedVector;

    // Data global to all vectors

    unsigned mLo;

    unsigned mHi;

    unsigned mProblemSize;

    // Data local to a single vector

    unsigned mSizeMultiplier;

    Vec mVec;

    double* mpVec;

    DistributedVectorFactory* mpFactory;

    bool mReadOnly;


public:

    bool IsGlobalIndexLocal(unsigned globalIndex);

    DistributedVector(Vec vec, DistributedVectorFactory* pFactory, bool readOnly=false);

    unsigned GetHigh() const
    {
        return mHi;
    }

    unsigned GetLow() const
    {
        return mLo;
    }

    DistributedVectorFactory* GetFactory()
    {
        return mpFactory;
    }

    double& operator[](unsigned globalIndex);

    void Restore();

    class Iterator
    {
    public:
        unsigned Local;  
        unsigned Global; 
        bool operator!=(const Iterator& rOther);

        Iterator& operator++();
    };

    class Stripe
    {
        unsigned mStride; 
        unsigned mStripe; 
        double* mpVec;    
        unsigned mLo;     
        unsigned mHi;     
        DistributedVectorFactory* mpFactory; 
    public:
        Stripe(DistributedVector parallelVec, unsigned stripe)
        {
            mStride = parallelVec.mSizeMultiplier;
            mStripe = stripe;
            assert(mStripe < mStride);
            mpVec = parallelVec.mpVec;
            mLo = parallelVec.GetLow();
            mHi = parallelVec.GetHigh();
            mpFactory = parallelVec.GetFactory();
        }

        DistributedVectorFactory* GetFactory()
        {
            return mpFactory;
        }

        double& operator[](unsigned globalIndex)
        {
            if (mLo <= globalIndex && globalIndex < mHi)
            {
                return mpVec[(globalIndex - mLo)*mStride + mStripe];
            }
            throw DistributedVectorException();
        }

        double& operator[](Iterator index)
        {
            return mpVec[index.Local*mStride + mStripe];
        }
    };

    class Chunk
    {
        unsigned mOffset; 
        double* mpVec;    
        unsigned mLo;     
        unsigned mHi;     
    public:
        Chunk(DistributedVector parallelVec, unsigned chunk)
        {
            assert(chunk < parallelVec.mSizeMultiplier);
            mLo = parallelVec.GetLow();
            mHi = parallelVec.GetHigh();
            mOffset = chunk * (mHi - mLo);
            mpVec = parallelVec.mpVec;
        }

        double& operator[](unsigned globalIndex)
        {
            if (mLo <= globalIndex && globalIndex < mHi)
            {
                //localIndex = globalIndex - mLo
                return mpVec[mOffset + globalIndex - mLo];
            }
            throw DistributedVectorException();
         }

        double& operator[](Iterator index)
        {
            return mpVec[mOffset + index.Local];
        }
    };

    Iterator Begin();

    Iterator End();

    double& operator[](Iterator index);
};

#endif /*DISTRIBUTEDVECTOR_HPP_*/