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/////////////////////////////////////////////////////////////
// //
// Copyright (c) 2003-2014 by The University of Queensland //
// Centre for Geoscience Computing //
// http://earth.uq.edu.au/centre-geoscience-computing //
// //
// Primary Business: Brisbane, Queensland, Australia //
// Licensed under the Open Software License version 3.0 //
// http://www.apache.org/licenses/LICENSE-2.0 //
// //
/////////////////////////////////////////////////////////////
#ifndef ESYS_LSMITERATIVEREADER_H
#define ESYS_LSMITERATIVEREADER_H
#include <sstream>
#include <memory>
namespace esys
{
namespace lsm
{
/**
*
*/
template <class TmplData>
class IStreamIterator
{
public:
typedef TmplData value_type;
IStreamIterator(std::istream &iStream, int numElements);
virtual ~IStreamIterator();
/**
* Returns true if there are any elements remaining in
* the stream.
*/
bool hasNext() const;
/**
* Returns the next element in the stream.
*/
const TmplData &next();
/**
* Returns the number of elements remaining in the stream.
*/
int getNumRemaining() const;
protected:
IStreamIterator(const IStreamIterator &it);
IStreamIterator &operator=(const IStreamIterator &it);
virtual void readDataFromStream();
std::istream *m_pIStream;
TmplData m_data;
int m_numRemaining;
};
/**
* Template class which provides an iterator for reading
* multiple data-items from a stream.
*
* @param TmplData data class.
* The <code>operator<<(std::istream &iStream, TmplData &data)</code>
* operator is used to assign stream data inside the
* methods of the IterativeReader<TmplData>::Iterator class.
*/
template <class TmplIterator>
class IterativeReader
{
public:
typedef TmplIterator Iterator;
IterativeReader(std::istream &iStream);
virtual ~IterativeReader();
/**
* Creates the iterator using the istream and
* using the value returned by getNumElements.
*/
virtual void initialise();
/**
* Returns the number of elements to be read from the stream.
*/
int getNumElements() const;
/**
* Returns whether this reader is initialised, that is,
* whether an iterator has been created.
*/
bool isInitialised() const;
Iterator &getIterator();
protected:
typedef std::auto_ptr<Iterator> IteratorAutoPtr;
void setNumElements(int numElements);
std::istream &getIStream();
const std::istream &getIStream() const;
/**
* Returns a new Iterator object. Caller of this method is
* to take ownership for the returned object.
*/
virtual Iterator *createNewIterator();
private:
int m_numElements;
std::istream *m_pIStream;
IteratorAutoPtr m_iteratorPtr;
};
}
}
#include "Parallel/IterativeReader.hpp"
#endif
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