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//
// RowIterator.cpp
//
// Library: Data
// Package: DataCore
// Module: RowIterator
//
// Copyright (c) 2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier: BSL-1.0
//
#include "Poco/Data/RowIterator.h"
#include "Poco/Data/RecordSet.h"
#undef min
#undef max
#include <limits>
namespace Poco {
namespace Data {
const std::size_t RowIterator::POSITION_END = std::numeric_limits<std::size_t>::max();
RowIterator::RowIterator(RecordSet* pRecordSet, bool positionEnd):
_pRecordSet(pRecordSet),
_position(positionEnd ? POSITION_END : 0)
{
}
RowIterator::RowIterator(const RowIterator& other):
_pRecordSet(other._pRecordSet),
_position(other._position)
{
}
RowIterator::~RowIterator()
{
}
RowIterator& RowIterator::operator = (const RowIterator& other)
{
RowIterator tmp(other);
swap(tmp);
return *this;
}
void RowIterator::swap(RowIterator& other)
{
using std::swap;
swap(_pRecordSet, other._pRecordSet);
swap(_position, other._position);
}
void RowIterator::increment() const
{
if (POSITION_END == _position)
throw RangeException("End of iterator reached.");
if (_position < _pRecordSet->subTotalRowCount() - 1)
++_position;
else
_position = POSITION_END;
if (_pRecordSet->getFilter() && POSITION_END != _position)
{
while (!_pRecordSet->isAllowed(_position))
{
increment();
if (POSITION_END == _position) break;
}
}
}
void RowIterator::decrement() const
{
if (0 == _position)
throw RangeException("Beginning of iterator reached.");
else if (POSITION_END == _position)
_position = _pRecordSet->subTotalRowCount() - 1;
else
--_position;
if (_pRecordSet->getFilter() && 0 != _position)
{
while (!_pRecordSet->isAllowed(_position))
{
decrement();
if (0 == _position) break;
}
}
}
void RowIterator::setPosition(std::size_t pos) const
{
if (_position == pos) return;
if (_pRecordSet->getFilter())
{
std::size_t start = _position;
if (_position > pos)
{
std::size_t end = _position - pos;
for (; start > end; --start)
{
if (pos) --pos;
else throw RangeException("Invalid position argument.");
}
}
else
{
std::size_t end = pos - _position;
for (; start < end; ++start)
{
if (_pRecordSet->subTotalRowCount() != pos) ++pos;
else throw RangeException("Invalid position argument.");
}
}
}
if (pos < _pRecordSet->subTotalRowCount())
_position = pos;
else if (pos == _pRecordSet->subTotalRowCount())
_position = POSITION_END;
else
throw RangeException("Invalid position argument.");
}
Row& RowIterator::operator * () const
{
if (POSITION_END == _position)
throw InvalidAccessException("End of iterator reached.");
return _pRecordSet->row(_position);
}
Row* RowIterator::operator -> () const
{
if (POSITION_END == _position)
throw InvalidAccessException("End of iterator reached.");
return &_pRecordSet->row(_position);
}
const RowIterator& RowIterator::operator ++ () const
{
increment();
return *this;
}
RowIterator RowIterator::operator ++ (int) const
{
RowIterator old(*this);
increment();
return old;
}
const RowIterator& RowIterator::operator -- () const
{
decrement();
return *this;
}
RowIterator RowIterator::operator -- (int) const
{
RowIterator old(*this);
decrement();
return old;
}
RowIterator RowIterator::operator + (std::size_t diff) const
{
RowIterator ri(*this);
ri.setPosition(_position + diff);
return ri;
}
RowIterator RowIterator::operator - (std::size_t diff) const
{
if (diff > _position) throw RangeException("Invalid position argument.");
RowIterator ri(*this);
ri.setPosition(_position - diff);
return ri;
}
} } // namespace Poco::Data
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