AbstractMeshReader.hpp

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*/
 
 
#ifndef _ABSTRACTMESHREADER_HPP_
#define _ABSTRACTMESHREADER_HPP_
 
#include <string>
#include <vector>
#include <set>
#include <cassert>
#include <boost/iterator/iterator_facade.hpp>
#include "Exception.hpp"
 
struct ElementData
{
    // Constructor to initialise default values, to prevent -Werror=maybe-uninitialized on some compilers
    ElementData()
            : NodeIndices(std::vector<unsigned>()),
              AttributeValue(DOUBLE_UNSET),
              ContainingElement(UNSIGNED_UNSET) {}
    std::vector<unsigned> NodeIndices; 
    double AttributeValue; 
    unsigned ContainingElement; 
};
 
template<unsigned ELEMENT_DIM, unsigned SPACE_DIM>
class AbstractMeshReader
{
 
public:
 
    virtual ~AbstractMeshReader()
    {}
 
    virtual unsigned GetNumElements() const =0;
 
    virtual unsigned GetNumNodes() const =0;
 
    virtual unsigned GetNumFaces() const =0;
 
    virtual unsigned GetNumCableElements() const;
 
    virtual unsigned GetNumElementAttributes() const;
 
    virtual unsigned GetNumFaceAttributes() const;
 
    virtual unsigned GetNumCableElementAttributes() const;
 
    virtual std::vector<double> GetNodeAttributes();
 
    unsigned GetNumEdges() const;
 
    virtual std::vector<double> GetNextNode()=0;
 
    virtual void Reset()=0;
 
    virtual ElementData GetNextElementData()=0;
 
    virtual ElementData GetNextFaceData()=0;
 
    virtual ElementData GetNextCableElementData();
 
    ElementData GetNextEdgeData();
 
 
     virtual std::vector<double> GetNode(unsigned index);
 
    virtual ElementData GetElementData(unsigned index);
 
    virtual ElementData GetFaceData(unsigned index);
 
    ElementData GetEdgeData(unsigned index);
 
    virtual std::vector<unsigned> GetContainingElementIndices(unsigned index);
 
    virtual std::string GetMeshFileBaseName();
 
    virtual unsigned GetOrderOfElements();
 
    virtual unsigned GetOrderOfBoundaryElements();
 
    virtual bool GetReadContainingElementOfBoundaryElement();
 
 
    virtual bool IsFileFormatBinary();
 
    virtual bool HasNclFile();
 
    virtual bool HasNodePermutation();
 
    virtual const std::vector<unsigned>& rGetNodePermutation();
 
 
    // Iterator classes
 
    class ElementIterator : public boost::iterator_facade<ElementIterator, const ElementData,
                                                          boost::single_pass_traversal_tag>
    {
    public:
        ElementIterator(unsigned index, AbstractMeshReader<ELEMENT_DIM, SPACE_DIM>* pReader)
            : mIndex(index),
              mpIndices(nullptr),
              mpReader(pReader)
        {
            CacheData(mIndex, true);
        }
 
        ElementIterator(const std::set<unsigned>& rIndices,
                        AbstractMeshReader<ELEMENT_DIM, SPACE_DIM>* pReader);
 
        unsigned GetIndex() const
        {
            return mIndex;
        }
 
    private:
        friend class boost::iterator_core_access;
 
        void CacheData(unsigned index, bool firstRead = false);
 
        void increment();
 
        bool equal(const ElementIterator& rOther) const
        {
            return mIndex == rOther.mIndex;
        }
 
        const ElementData& dereference() const
        {
            assert(mpReader);
            assert(mIndex < mpReader->GetNumElements());
            // This was cached in increment()
            return mLastDataRead;
        }
 
        unsigned mIndex;
 
        const std::set<unsigned>* mpIndices;
 
        std::set<unsigned>::const_iterator mIndicesIterator;
 
        AbstractMeshReader<ELEMENT_DIM, SPACE_DIM>* mpReader;
 
        ElementData mLastDataRead;
    };
 
    ElementIterator GetElementIteratorBegin();
 
    ElementIterator GetElementIteratorBegin(const std::set<unsigned>& rIndices);
 
    ElementIterator GetElementIteratorEnd();
 
 
    class NodeIterator : public boost::iterator_facade<NodeIterator, const std::vector<double>,
                                                       boost::single_pass_traversal_tag>
    {
    public:
        NodeIterator(unsigned index, AbstractMeshReader<ELEMENT_DIM, SPACE_DIM>* pReader)
            : mIndex(index),
              mpIndices(nullptr),
              mpReader(pReader)
        {
            CacheData(mIndex, true);
        }
 
        NodeIterator(const std::set<unsigned>& rIndices,
                     AbstractMeshReader<ELEMENT_DIM, SPACE_DIM>* pReader);
 
        unsigned GetIndex() const
        {
            return mIndex;
        }
 
    private:
        friend class boost::iterator_core_access;
 
        void CacheData(unsigned index, bool firstRead = false);
 
        void increment();
 
        bool equal(const NodeIterator& rOther) const
        {
            return mIndex == rOther.mIndex;
        }
 
        const std::vector<double>& dereference() const
        {
            assert(mpReader);
            assert(mIndex < mpReader->GetNumNodes());
            // This was cached in increment()
            return mLastDataRead;
        }
 
        unsigned mIndex;
 
        const std::set<unsigned>* mpIndices;
 
        std::set<unsigned>::const_iterator mIndicesIterator;
 
        AbstractMeshReader<ELEMENT_DIM, SPACE_DIM>* mpReader;
 
        std::vector<double> mLastDataRead;
    };
 
    NodeIterator GetNodeIteratorBegin();
 
    NodeIterator GetNodeIteratorBegin(const std::set<unsigned>& rIndices);
 
    NodeIterator GetNodeIteratorEnd();
};
 
#endif //_ABSTRACTMESHREADER_HPP_