greenplumn CParseHandlerCost 代码
文件路径：/src/backend/gporca/libnaucrates/src/parser/CParseHandlerCost.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2010 Greenplum, Inc.
/
/ @filename:
/ CParseHandlerCost.cpp
/
/ @doc:
/ Implementation of the SAX parse handler class for parsing cost estimates.
/---------------------------------------------------------------------------
#include "naucrates/dxl/parser/CParseHandlerCost.h"
#include "naucrates/dxl/operators/CDXLOperatorFactory.h"
#include "naucrates/dxl/parser/CParseHandlerPhysicalOp.h"
#include "naucrates/dxl/xml/dxltokens.h"
using namespace gpdxl;
XERCES_CPP_NAMESPACE_USE
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerCost::CParseHandlerCost
/
/ @doc:
/ Constructor
/
/---------------------------------------------------------------------------
CParseHandlerCost::CParseHandlerCost(CMemoryPool *mp,
CParseHandlerManager *parse_handler_mgr,
CParseHandlerBase *parse_handler_root)
: CParseHandlerBase(mp, parse_handler_mgr, parse_handler_root),
m_operator_cost_dxl(nullptr)
{
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerCost::~CParseHandlerCost
/
/ @doc:
/ Destructor
/
/---------------------------------------------------------------------------
CParseHandlerCost::~CParseHandlerCost()
{
CRefCount::SafeRelease(m_operator_cost_dxl);
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerCost::MakeDXLOperatorCost
/
/ @doc:
/ Destructor
/
/---------------------------------------------------------------------------
CDXLOperatorCost *
CParseHandlerCost::GetDXLOperatorCost()
{
return m_operator_cost_dxl;
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerCost::StartElement
/
/ @doc:
/ Invoked by Xerces to process an opening tag
/
/---------------------------------------------------------------------------
void
CParseHandlerCost::StartElement(const XMLCh *const, / element_uri,
const XMLCh *const element_local_name,
const XMLCh *const, / element_qname
const Attributes &attrs)
{
if (0 != XMLString::compareString(CDXLTokens::XmlstrToken(EdxltokenCost),
element_local_name))
{
CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
str->GetBuffer());
}
/ get cost estimates from attributes
m_operator_cost_dxl = CDXLOperatorFactory::MakeDXLOperatorCost(
m_parse_handler_mgr->GetDXLMemoryManager(), attrs);
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerCost::EndElement
/
/ @doc:
/ Invoked by Xerces to process a closing tag
/
/---------------------------------------------------------------------------
void
CParseHandlerCost::EndElement(const XMLCh *const, / element_uri,
const XMLCh *const element_local_name,
const XMLCh *const / element_qname
)
{
if (0 != XMLString::compareString(CDXLTokens::XmlstrToken(EdxltokenCost),
element_local_name))
{
CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
str->GetBuffer());
}
/ deactivate handler
m_parse_handler_mgr->DeactivateHandler();
}
/ EOF
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