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//
// VarIterator.cpp
//
// Library: Foundation
// Package: Dynamic
// Module: VarIterator
//
// Copyright (c) 2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier: BSL-1.0
//
#include "Poco/Dynamic/VarIterator.h"
#include "Poco/Dynamic/Var.h"
#include "Poco/Dynamic/Struct.h"
#undef min
#undef max
#include <limits>
namespace Poco {
namespace Dynamic {
const std::size_t VarIterator::POSITION_END = std::numeric_limits<std::size_t>::max();
VarIterator::VarIterator(Var* pVar, bool positionEnd):
_pVar(pVar),
_position(positionEnd ? POSITION_END : 0)
{
}
VarIterator::VarIterator(const VarIterator& other):
_pVar(other._pVar),
_position(other._position)
{
}
VarIterator::~VarIterator()
{
}
VarIterator& VarIterator::operator = (const VarIterator& other)
{
VarIterator tmp(other);
swap(tmp);
return *this;
}
void VarIterator::swap(VarIterator& other)
{
using std::swap;
swap(_pVar, other._pVar);
swap(_position, other._position);
}
void VarIterator::increment() const
{
if (POSITION_END == _position)
throw RangeException("End of iterator reached.");
if (_position < _pVar->size() - 1)
++_position;
else
_position = POSITION_END;
}
void VarIterator::decrement() const
{
if (0 == _position)
throw RangeException("Beginning of iterator reached.");
else if (POSITION_END == _position)
_position = _pVar->size() - 1;
else
--_position;
}
void VarIterator::setPosition(std::size_t pos) const
{
if (_position == pos) return;
if (pos < _pVar->size())
_position = pos;
else if (pos == _pVar->size())
_position = POSITION_END;
else
throw RangeException("Invalid position argument.");
}
Var& VarIterator::operator * () const
{
if (POSITION_END == _position)
throw InvalidAccessException("End of iterator reached.");
return _pVar->operator[](_position);
}
Var* VarIterator::operator -> () const
{
if (POSITION_END == _position)
throw InvalidAccessException("End of iterator reached.");
return &_pVar->operator[](_position);
}
const VarIterator& VarIterator::operator ++ () const
{
increment();
return *this;
}
VarIterator VarIterator::operator ++ (int) const
{
VarIterator old(*this);
increment();
return old;
}
const VarIterator& VarIterator::operator -- () const
{
decrement();
return *this;
}
VarIterator VarIterator::operator -- (int) const
{
VarIterator old(*this);
decrement();
return old;
}
VarIterator VarIterator::operator + (std::size_t diff) const
{
VarIterator ri(*this);
ri.setPosition(_position + diff);
return ri;
}
VarIterator VarIterator::operator - (std::size_t diff) const
{
if (diff > _position) throw RangeException("Invalid position argument.");
VarIterator ri(*this);
ri.setPosition(_position - diff);
return ri;
}
} } // namespace Poco::Dynamic
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