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HDF5TimeSeriesIterator.h
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HDF5TimeSeriesIterator.h
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/************************************************************************
* Copyright(c) 2009, One Unified. All rights reserved. *
* *
* This file is provided as is WITHOUT ANY WARRANTY *
* without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. *
* *
* This software may not be used nor distributed without proper license *
* agreement. *
* *
* See the file LICENSE.txt for redistribution information. *
************************************************************************/
#pragma once
#include <iterator>
#include <stdexcept>
#include "LibTimeSeries/DatedDatum.h"
#include "HDF5DataManager.h"
#include "HDF5TimeSeriesAccessor.h"
#include "HDF5TimeSeriesContainer.h"
namespace ou { // One Unified
namespace tf { // TradeFrame
template<class T> class CHDF5TimeSeriesContainer;
template<class T> class CHDF5TimeSeriesIterator:
public std::iterator<std::random_access_iterator_tag, T, hsize_t> {
friend class CHDF5TimeSeriesContainer<T>;
public:
explicit CHDF5TimeSeriesIterator<T>( void );
explicit CHDF5TimeSeriesIterator<T>( CHDF5TimeSeriesAccessor<T> *pAccessor, hsize_t Index ); // begin() or later init
typedef std::random_access_iterator_tag iterator_category;
CHDF5TimeSeriesIterator<T>( const CHDF5TimeSeriesIterator<T>& other ); // copy constructor
~CHDF5TimeSeriesIterator<T>( void ) { };
//typedef CHDF5TimeSeriesIterator self_type;
//typedef self_type &self_reference;
CHDF5TimeSeriesIterator<T>& operator=( const CHDF5TimeSeriesIterator<T> &other );
CHDF5TimeSeriesIterator<T>& operator++(); // pre-increment
CHDF5TimeSeriesIterator<T> operator++( int ); // post-increment
CHDF5TimeSeriesIterator<T>& operator+=( const hsize_t inc );
CHDF5TimeSeriesIterator<T>& operator-=( const hsize_t inc );
CHDF5TimeSeriesIterator<T> operator-( const hsize_t val );
hsize_t operator-( const CHDF5TimeSeriesIterator<T> &other ) const;
bool operator<( const CHDF5TimeSeriesIterator<T> &other ) const;
bool operator==( const CHDF5TimeSeriesIterator<T> &other ) const;
bool operator!=( const CHDF5TimeSeriesIterator<T> &other ) const;
//CHDF5TimeSeriesIterator<T> &operator[]( const hsize_t Index );
reference operator*();
//reference operator->();
protected:
bool m_bValidIndex; // m_ItemIndex is valid ie, is something from .begin() to .end()
CHDF5TimeSeriesAccessor<T> *m_pAccessor;
hsize_t m_ItemIndex; // index into specific item
T m_T; // the currently retrieved datum, could keep and track two values in order to optimize lower_bound speed somewhat
private:
};
template<class T> CHDF5TimeSeriesIterator<T>::CHDF5TimeSeriesIterator( void ):
m_pAccessor( NULL ),
m_ItemIndex( 0 ),
m_bValidIndex( false )
{
}
template<class T> CHDF5TimeSeriesIterator<T>::CHDF5TimeSeriesIterator( CHDF5TimeSeriesAccessor<T> *pAccessor, hsize_t Index ):
m_pAccessor( pAccessor ),
m_ItemIndex( Index ),
m_bValidIndex( false ) {
if ( Index > m_pAccessor->size() ) throw std::runtime_error( "Index out of range on construction" );
// Index == m_pAccessor->size() is same as end();
//if ( Index < m_pAccessor->size() ) {
// m_pAccessor->ReadItem( m_ItemIndex, &m_T ); // don't preload
//}
m_bValidIndex = true;
}
template<class T> CHDF5TimeSeriesIterator<T>::CHDF5TimeSeriesIterator( const CHDF5TimeSeriesIterator<T>& other ) :
m_pAccessor( other.m_pAccessor ),
m_bValidIndex( other.m_bValidIndex ),
m_ItemIndex( other.m_ItemIndex ),
m_T( other.m_T )
{
}
template<class T> CHDF5TimeSeriesIterator<T>& CHDF5TimeSeriesIterator<T>::operator=( const CHDF5TimeSeriesIterator<T> &other ) {
// has two choices: first assigned from, second being assigned to
if ( this == &other ) {
// a) being assigned from, so just return reference
}
else {
// b) being assigned to
m_pAccessor = other.m_pAccessor;
m_bValidIndex = other.m_bValidIndex;
m_ItemIndex = other.m_ItemIndex;
m_T = other.m_T;
}
return( *this );
}
template<class T> CHDF5TimeSeriesIterator<T>& CHDF5TimeSeriesIterator<T>::operator++() { // pre-increment
assert( m_bValidIndex );
assert( m_ItemIndex < m_pAccessor->size() );
++m_ItemIndex;
//if ( m_ItemIndex < m_pAccessor->size() ) {
// m_pAccessor->ReadItem( m_ItemIndex, &m_T ); // retrieve at our new location if we can
//}
return( *this );
}
template<class T> CHDF5TimeSeriesIterator<T> CHDF5TimeSeriesIterator<T>::operator++( int ) { // post-increment
CHDF5TimeSeriesIterator<T> result( *this ); // make a copy of what is before increment
assert( m_bValidIndex );
assert( m_ItemIndex < m_pAccessor->size() );
++m_ItemIndex;
//if ( m_ItemIndex < m_pAccessor->size() ) {
// m_pAccessor->Retrieve( m_ItemIndex, &m_T );
//}
return( result );
}
template<class T> CHDF5TimeSeriesIterator<T>& CHDF5TimeSeriesIterator<T>::operator+=( const hsize_t inc ) { // plus assignment
assert( m_bValidIndex );
m_ItemIndex += inc;
assert( m_ItemIndex <= m_pAccessor->size() );
//if ( m_ItemIndex < m_pAccessor->size() ) {
// m_pAccessor->ReadItem( m_ItemIndex, &m_T ); // retrieve at our new location if we can
//}
return( *this );
}
template<class T> CHDF5TimeSeriesIterator<T>& CHDF5TimeSeriesIterator<T>::operator-=( const hsize_t inc ) { // plus assignment
assert( m_bValidIndex );
assert( inc <= m_ItemIndex );
m_ItemIndex -= inc;
//if ( m_ItemIndex < m_pAccessor->size() ) {
// m_pAccessor->ReadItem( m_ItemIndex, &m_T ); // retrieve at our new location if we can
//}
return( *this );
}
template<class T> CHDF5TimeSeriesIterator<T> CHDF5TimeSeriesIterator<T>::operator-( const hsize_t val ) { // subtraction
assert( val <= m_ItemIndex );
CHDF5TimeSeriesIterator<T> result( *this ); // make a copy of this
result.m_ItemIndex -= val;
return result;
}
template<class T> hsize_t CHDF5TimeSeriesIterator<T>::operator-( const CHDF5TimeSeriesIterator<T> &other ) const { // subtraction
return m_ItemIndex - other.m_ItemIndex;
}
template<class T> bool CHDF5TimeSeriesIterator<T>::operator<( const CHDF5TimeSeriesIterator<T> &other ) const {
assert( m_pAccessor == other.m_pAccessor );
return ( m_ItemIndex < other.m_ItemIndex );
}
template<class T> bool CHDF5TimeSeriesIterator<T>::operator==( const CHDF5TimeSeriesIterator<T> &other ) const {
assert( m_pAccessor == other.m_pAccessor );
return ( m_ItemIndex == other.m_ItemIndex );
}
template<class T> bool CHDF5TimeSeriesIterator<T>::operator!=( const CHDF5TimeSeriesIterator<T> &other ) const {
assert( m_pAccessor == other.m_pAccessor );
return !( m_ItemIndex == other.m_ItemIndex );
}
template<class T> typename CHDF5TimeSeriesIterator<T>::reference CHDF5TimeSeriesIterator<T>::operator*() {
assert( m_bValidIndex );
assert( m_ItemIndex < m_pAccessor->size() );
m_pAccessor->Read( m_ItemIndex, &m_T );
return m_T;
}
//template<class T> typename CHDF5TimeSeriesIterator<T>::reference CHDF5TimeSeriesIterator<T>::operator->() {
// m_pAccessor->ReadItem( m_ItemIndex, &m_T );
// return m_T; // not sure yet how this works
//}
// does operator[] make sense for iterator? ... look in requirements for a random interator
//template<class T> CHDF5TimeSeriesIterator<T> &CHDF5TimeSeriesIterator<T>::operator[]( const hsize_t Index ) {
// assert( Index < m_pAccessor->size() );
// m_ItemIndex = Index;
// m_bValidIndex = true;
// m_pAccessor->Retrieve( Index, &m_T );
// return (*this);
//}
} // namespace tf
} // namespace ou