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Copy pathRowFilter.cpp
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executable file
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//
// RowFilter.cpp
//
// $Id: //poco/Main/Data/src/RowFilter.cpp#1 $
//
// Library: Data
// Package: DataCore
// Module: RowFilter
//
// Copyright (c) 2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier: BSL-1.0
//
#include "Poco/Data/RowFilter.h"
#include "Poco/Data/RecordSet.h"
#include "Poco/String.h"
#include "Poco/Exception.h"
#include <functional>
namespace Poco {
namespace Data {
RowFilter::RowFilter(RecordSet* pRecordSet): _pRecordSet(pRecordSet), _not(false)
{
poco_check_ptr(pRecordSet);
init();
_pRecordSet->filter(this);
}
RowFilter::RowFilter(Ptr pParent, LogicOperator op): _pRecordSet(0),
_pParent(pParent),
_not(false)
{
poco_check_ptr(_pParent.get());
init();
_pParent->addFilter(this, op);
}
void RowFilter::init()
{
_comparisons.insert(Comparisons::value_type("<", VALUE_LESS_THAN));
_comparisons.insert(Comparisons::value_type("<=", VALUE_LESS_THAN_OR_EQUAL));
_comparisons.insert(Comparisons::value_type("=", VALUE_EQUAL));
_comparisons.insert(Comparisons::value_type("==", VALUE_EQUAL));
_comparisons.insert(Comparisons::value_type(">", VALUE_GREATER_THAN));
_comparisons.insert(Comparisons::value_type(">=", VALUE_GREATER_THAN_OR_EQUAL));
_comparisons.insert(Comparisons::value_type("<>", VALUE_NOT_EQUAL));
_comparisons.insert(Comparisons::value_type("!=", VALUE_NOT_EQUAL));
_comparisons.insert(Comparisons::value_type("IS NULL", VALUE_IS_NULL));
duplicate();
}
RowFilter::~RowFilter()
{
release();
if (_pRecordSet) _pRecordSet->filter(0);
if (_pParent.get()) _pParent->removeFilter(this);
}
bool RowFilter::isAllowed(std::size_t row) const
{
Poco::Dynamic::Var retVal;
const RecordSet& rs = recordSet();
std::size_t columns = rs.columnCount();
ComparisonMap::const_iterator it = _comparisonMap.begin();
ComparisonMap::const_iterator end = _comparisonMap.end();
for (; it != end; ++it)
{
for (std::size_t col = 0; col < columns; ++col)
{
const std::string name = toUpper(rs.metaColumn(static_cast<UInt32>(col)).name());
if (_comparisonMap.find(name) == _comparisonMap.end()) continue;
Poco::Dynamic::Var ret;
CompT compOp = 0;
Poco::Dynamic::Var val = rs.value(col, row, false);
switch (it->second.get<1>())
{
case VALUE_LESS_THAN:
compOp = less; break;
case VALUE_LESS_THAN_OR_EQUAL:
compOp = lessOrEqual; break;
case VALUE_EQUAL:
compOp = equal; break;
case VALUE_GREATER_THAN:
compOp = greater; break;
case VALUE_GREATER_THAN_OR_EQUAL:
compOp = greaterOrEqual; break;
case VALUE_NOT_EQUAL:
compOp = notEqual; break;
case VALUE_IS_NULL:
compOp = isNull; break;
default:
throw IllegalStateException("Unsupported comparison criteria.");
}
doCompare(ret, val, compOp, it->second);
if (retVal.isEmpty()) retVal = ret;
else retVal = retVal || ret;
}
}
// iterate through children
FilterMap::const_iterator fIt = _filterMap.begin();
FilterMap::const_iterator fEnd = _filterMap.end();
for (; fIt != fEnd; ++fIt)
{
if (OP_OR == fIt->second)
{
if (retVal.isEmpty())
retVal = fIt->first->isAllowed(row);
else
retVal = retVal || fIt->first->isAllowed(row);
}
else if (OP_AND == fIt->second)
{
if (retVal.isEmpty())
retVal = fIt->first->isAllowed(row);
else
retVal = retVal && fIt->first->isAllowed(row);
}
else
throw IllegalStateException("Unknown logical operation.");
}
if (retVal.isEmpty()) retVal = true; // no filtering found
return (!_not) && retVal.extract<bool>();
}
int RowFilter::remove(const std::string& name)
{
poco_check_ptr (_pRecordSet);
_pRecordSet->moveFirst();
return static_cast<int>(_comparisonMap.erase(toUpper(name)));
}
RowFilter::Comparison RowFilter::getComparison(const std::string& comp) const
{
Comparisons::const_iterator it = _comparisons.find(toUpper(comp));
if (it == _comparisons.end())
throw NotFoundException("Comparison not found", comp);
return it->second;
}
void RowFilter::addFilter(const Ptr& pFilter, LogicOperator comparison)
{
poco_check_ptr (_pRecordSet);
pFilter->_pRecordSet = _pRecordSet;
_pRecordSet->moveFirst();
_filterMap.insert(FilterMap::value_type(pFilter, comparison));
}
void RowFilter::removeFilter(const Ptr& pFilter)
{
poco_check_ptr (_pRecordSet);
pFilter->_pRecordSet = 0;
_pRecordSet->moveFirst();
_filterMap.erase(pFilter);
}
void RowFilter::doCompare(Poco::Dynamic::Var& ret,
Poco::Dynamic::Var& val,
CompT comp,
const ComparisonEntry& ce)
{
if (ret.isEmpty()) ret = comp(val, ce.get<0>());
else
{
if (ce.get<2>() == OP_OR)
ret = ret || comp(val, ce.get<0>());
else if (ce.get<2>() == OP_AND)
ret = ret && comp(val, ce.get<0>());
else
throw IllegalStateException("Unknown logical operation.");
}
}
RecordSet& RowFilter::recordSet() const
{
if (!_pRecordSet)
{
Ptr pParent = _pParent;
while (pParent && !_pRecordSet)
_pRecordSet = pParent->_pRecordSet;
}
poco_check_ptr (_pRecordSet);
return *_pRecordSet;
}
} } // namespace Poco::Data