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230 lines
4.9 KiB
C++
230 lines
4.9 KiB
C++
//
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// RowIterator.cpp
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//
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// $Id: //poco/Main/Data/src/RowIterator.cpp#1 $
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//
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// Library: Data
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// Package: DataCore
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// Module: RowIterator
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//
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// Copyright (c) 2006, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// Permission is hereby granted, free of charge, to any person or organization
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// obtaining a copy of the software and accompanying documentation covered by
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// this license (the "Software") to use, reproduce, display, distribute,
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// execute, and transmit the Software, and to prepare derivative works of the
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// Software, and to permit third-parties to whom the Software is furnished to
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// do so, all subject to the following:
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//
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// The copyright notices in the Software and this entire statement, including
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// the above license grant, this restriction and the following disclaimer,
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// must be included in all copies of the Software, in whole or in part, and
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// all derivative works of the Software, unless such copies or derivative
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// works are solely in the form of machine-executable object code generated by
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// a source language processor.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
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// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
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// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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//
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#include "Poco/Data/RowIterator.h"
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#include "Poco/Data/RecordSet.h"
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#undef min
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#undef max
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#include <limits>
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namespace Poco {
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namespace Data {
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const int RowIterator::POSITION_END = std::numeric_limits<std::size_t>::max();
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RowIterator::RowIterator(RecordSet* pRecordSet, bool positionEnd):
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_pRecordSet(pRecordSet),
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_position(positionEnd ? POSITION_END : 0)
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{
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}
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RowIterator::RowIterator(const RowIterator& other):
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_pRecordSet(other._pRecordSet),
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_position(other._position)
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{
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}
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RowIterator::~RowIterator()
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{
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}
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RowIterator& RowIterator::operator = (const RowIterator& other)
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{
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RowIterator tmp(other);
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swap(tmp);
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return *this;
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}
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void RowIterator::swap(RowIterator& other)
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{
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using std::swap;
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swap(_pRecordSet, other._pRecordSet);
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swap(_position, other._position);
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}
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void RowIterator::increment() const
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{
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if (POSITION_END == _position)
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throw RangeException("End of iterator reached.");
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if (_position < _pRecordSet->subTotalRowCount() - 1)
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++_position;
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else
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_position = POSITION_END;
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if (_pRecordSet->getFilter() && POSITION_END != _position)
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{
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while (!_pRecordSet->isAllowed(_position))
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{
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increment();
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if (POSITION_END == _position) break;
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}
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}
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}
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void RowIterator::decrement() const
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{
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if (0 == _position)
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throw RangeException("Beginning of iterator reached.");
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else if (POSITION_END == _position)
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_position = _pRecordSet->subTotalRowCount() - 1;
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else
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--_position;
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if (_pRecordSet->getFilter() && 0 != _position)
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{
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while (!_pRecordSet->isAllowed(_position))
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{
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decrement();
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if (0 == _position) break;
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}
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}
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}
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void RowIterator::setPosition(std::size_t pos) const
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{
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if (_position == pos) return;
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if (_pRecordSet->getFilter())
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{
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std::size_t start = _position;
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if (_position > pos)
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{
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std::size_t end = _position - pos;
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for (; start > end; --start)
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{
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if (pos) --pos;
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else throw RangeException("Invalid position argument.");
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}
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}
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else
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{
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std::size_t end = pos - _position;
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for (; start < end; ++start)
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{
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if (_pRecordSet->subTotalRowCount() != pos) ++pos;
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else throw RangeException("Invalid position argument.");
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}
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}
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}
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if (pos < _pRecordSet->subTotalRowCount())
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_position = pos;
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else if (pos == _pRecordSet->subTotalRowCount())
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_position = POSITION_END;
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else
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throw RangeException("Invalid position argument.");
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}
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Row& RowIterator::operator * () const
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{
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if (POSITION_END == _position)
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throw InvalidAccessException("End of iterator reached.");
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return _pRecordSet->row(_position);
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}
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Row* RowIterator::operator -> () const
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{
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if (POSITION_END == _position)
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throw InvalidAccessException("End of iterator reached.");
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return &_pRecordSet->row(_position);
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}
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const RowIterator& RowIterator::operator ++ () const
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{
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increment();
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return *this;
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}
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RowIterator RowIterator::operator ++ (int) const
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{
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RowIterator old(*this);
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increment();
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return old;
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}
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const RowIterator& RowIterator::operator -- () const
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{
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decrement();
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return *this;
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}
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RowIterator RowIterator::operator -- (int) const
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{
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RowIterator old(*this);
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decrement();
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return old;
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}
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RowIterator RowIterator::operator + (std::size_t diff) const
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{
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RowIterator ri(*this);
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ri.setPosition(_position + diff);
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return ri;
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}
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RowIterator RowIterator::operator - (std::size_t diff) const
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{
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if (diff > _position) throw RangeException("Invalid position argument.");
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RowIterator ri(*this);
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ri.setPosition(_position - diff);
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return ri;
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}
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} } // namespace Poco::Data
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