AbstractCachedMeshReader.cpp

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#include "AbstractCachedMeshReader.hpp"
#include "Exception.hpp"

#include <fstream>

// Implementation

template<unsigned ELEMENT_DIM, unsigned SPACE_DIM>
AbstractCachedMeshReader<ELEMENT_DIM, SPACE_DIM>::AbstractCachedMeshReader()
    : mNumNodeAttributes(0),
      mMaxNodeBdyMarker(0),
      mNumElementNodes(0),
      mNumElementAttributes(0),
      mMaxFaceBdyMarker(0),
      mIndexFromZero(false) // Initially assume that nodes are not numbered from zero
{
    // We have initialized all numeric variables to zero
}

template<unsigned ELEMENT_DIM, unsigned SPACE_DIM>
std::vector<std::string> AbstractCachedMeshReader<ELEMENT_DIM, SPACE_DIM>::GetRawDataFromFile(
        const std::string& rFileName)
{
    // Open raw data file

    std::vector<std::string> raw_data;
    std::ifstream data_file(rFileName.c_str());

    // Checks that input file has been opened correctly. If not throws an
    // exception that should be caught by the user.
    if (!data_file.is_open())
    {
        EXCEPTION("Could not open data file " + rFileName);
    }

    // Read each line in turn
    std::string raw_line;
    getline(data_file, raw_line);

    while (data_file)
    {
        // Remove comments (everything from a hash to the end of the line)
        // If there is no hash, then hashLocation = string::npos = -1 = 4294967295 = UINT_MAX
        // (so it works with unsigneds but is a little nasty)
        long hash_location = raw_line.find('#', 0);
        if (hash_location >= 0)
        {
            raw_line = raw_line.substr(0, hash_location);
        }
        // Remove blank lines.  This is unnecessary, since the tokenizer will
        // ignore blank lines anyway.
        long not_blank_location = raw_line.find_first_not_of(" \t", 0);
        if (not_blank_location >= 0)
        {
            raw_data.push_back(raw_line);
        }

        // Move onto next line
        getline(data_file, raw_line);
    }

    data_file.close(); // Closes the data file
    return raw_data;
}

template<unsigned ELEMENT_DIM, unsigned SPACE_DIM>
unsigned AbstractCachedMeshReader<ELEMENT_DIM, SPACE_DIM>::GetMaxNodeIndex()
{
    // Initialize an interator for the vector of nodes
    std::vector<std::vector<unsigned> >::iterator the_iterator;

    unsigned max_node_index = 0; // Nice if it were negative

    for (the_iterator = mElementData.begin(); the_iterator < mElementData.end(); the_iterator++)
    {
        std::vector<unsigned> indices = *the_iterator; // the_iterator points at each line in turn

        for (unsigned i = 0; i < ELEMENT_DIM+1; i++)
        {
            if ( indices[i] >  max_node_index)
            {
                max_node_index = indices[i];
            }
        }
    }

    return max_node_index;
}

template<unsigned ELEMENT_DIM, unsigned SPACE_DIM>
unsigned AbstractCachedMeshReader<ELEMENT_DIM, SPACE_DIM>::GetMinNodeIndex()
{
    // Initialize an interator for the vector of nodes
    std::vector<std::vector<unsigned> >::iterator the_iterator;

    unsigned min_node_index = UINT_MAX; // A large integer

    for (the_iterator = mElementData.begin(); the_iterator < mElementData.end(); the_iterator++)
    {
        std::vector<unsigned> indices = *the_iterator; // the_iterator points at each line in turn

        for (unsigned i = 0; i < ELEMENT_DIM+1; i++)
        {
            if (indices[i] < min_node_index)
            {
                min_node_index = indices[i];
            }
        }
    }

    return min_node_index;
}

template<unsigned ELEMENT_DIM, unsigned SPACE_DIM>
std::vector<double> AbstractCachedMeshReader<ELEMENT_DIM, SPACE_DIM>::GetNextNode()
{
    // Checks that there are still some nodes left to read. If not throws an
    // exception that must be caught by the user.
    if (mpNodeIterator == mNodeData.end())
    {
        EXCEPTION("All nodes already got");
    }

    std::vector<double> next_node = *mpNodeIterator;

    mpNodeIterator++;

    return next_node;
}

template<unsigned ELEMENT_DIM, unsigned SPACE_DIM>
ElementData AbstractCachedMeshReader<ELEMENT_DIM, SPACE_DIM>::GetNextElementData()
{
    // Checks that there are still some elements left to read. If not throws an
    // exception that must be caught by the user.
    if (mpElementIterator == mElementData.end())
    {
        EXCEPTION("All elements already got");
    }

    ElementData ret;
    ret.NodeIndices = *mpElementIterator;
    ret.AttributeValue = 0;

    mpElementIterator++;

    return ret;
}

template<unsigned ELEMENT_DIM, unsigned SPACE_DIM>
void AbstractCachedMeshReader<ELEMENT_DIM, SPACE_DIM>::Reset()
{
    mpElementIterator = mElementData.begin();
    mpFaceIterator = mFaceData.begin();
    mpNodeIterator = mNodeData.begin();
}

template<unsigned ELEMENT_DIM, unsigned SPACE_DIM>
ElementData AbstractCachedMeshReader<ELEMENT_DIM, SPACE_DIM>::GetNextFaceData()
{
    // Checks that there are still some faces left to read. If not throws an
    // exception that must be caught by the user.
    if (mpFaceIterator == mFaceData.end())
    {
        EXCEPTION("All faces (or edges) already got");
    }

    ElementData ret;
    ret.NodeIndices = *mpFaceIterator;
    ret.AttributeValue = 0;

    mpFaceIterator++;

    return ret;
}


template<unsigned ELEMENT_DIM, unsigned SPACE_DIM>
unsigned AbstractCachedMeshReader<ELEMENT_DIM, SPACE_DIM>::GetNumElements() const
{
    return mElementData.size();
}

template<unsigned ELEMENT_DIM, unsigned SPACE_DIM>
unsigned AbstractCachedMeshReader<ELEMENT_DIM, SPACE_DIM>::GetNumNodes() const
{
    return mNodeData.size();
}

template<unsigned ELEMENT_DIM, unsigned SPACE_DIM>
unsigned AbstractCachedMeshReader<ELEMENT_DIM, SPACE_DIM>::GetNumFaces() const
{
    return mFaceData.size();
}


// Explicit instantiation

template class AbstractCachedMeshReader<1,1>;
template class AbstractCachedMeshReader<1,2>;
template class AbstractCachedMeshReader<1,3>;
template class AbstractCachedMeshReader<2,2>;
template class AbstractCachedMeshReader<2,3>;
template class AbstractCachedMeshReader<3,3>;