greenplumn CParseHandlerStatistics 代码
文件路径：/src/backend/gporca/libnaucrates/src/parser/CParseHandlerStatistics.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2012 EMC Corp.
/
/ @filename:
/ CParseHandlerStatistics.cpp
/
/ @doc:
/ Implementation of the SAX parse handler class for parsing a DXL document
/---------------------------------------------------------------------------
#include "naucrates/dxl/parser/CParseHandlerStatistics.h"
#include "naucrates/dxl/operators/CDXLOperatorFactory.h"
#include "naucrates/dxl/parser/CParseHandlerFactory.h"
#include "naucrates/dxl/parser/CParseHandlerManager.h"
#include "naucrates/dxl/parser/CParseHandlerStatsDerivedRelation.h"
using namespace gpdxl;
XERCES_CPP_NAMESPACE_USE
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerStatistics::CParseHandlerStatistics
/
/ @doc:
/ Ctor
/
/---------------------------------------------------------------------------
CParseHandlerStatistics::CParseHandlerStatistics(
CMemoryPool *mp, CParseHandlerManager *parse_handler_mgr,
CParseHandlerBase *parse_handler_root)
: CParseHandlerBase(mp, parse_handler_mgr, parse_handler_root),
m_dxl_stats_derived_rel_array(nullptr)
{
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerStatistics::~CParseHandlerStatistics
/
/ @doc:
/ Dtor
/
/---------------------------------------------------------------------------
CParseHandlerStatistics::~CParseHandlerStatistics()
{
CRefCount::SafeRelease(m_dxl_stats_derived_rel_array);
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerStatistics::GetParseHandlerType
/
/ @doc:
/ Return the type of the parse handler. Currently we overload this method to
/ return a specific type for the plann, query and metadata parse handlers.
/
/---------------------------------------------------------------------------
EDxlParseHandlerType
CParseHandlerStatistics::GetParseHandlerType() const
{
return EdxlphStatistics;
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerStatistics::GetStatsDerivedRelDXLArray
/
/ @doc:
/ Returns the list of statistics objects constructed by the parser
/
/---------------------------------------------------------------------------
CDXLStatsDerivedRelationArray *
CParseHandlerStatistics::GetStatsDerivedRelDXLArray() const
{
return m_dxl_stats_derived_rel_array;
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerStatistics::StartElement
/
/ @doc:
/ Invoked by Xerces to process an opening tag
/
/---------------------------------------------------------------------------
void
CParseHandlerStatistics::StartElement(const XMLCh *const element_uri,
const XMLCh *const element_local_name,
const XMLCh *const element_qname,
const Attributes &attrs)
{
if (0 ==
XMLString::compareString(element_local_name,
CDXLTokens::XmlstrToken(EdxltokenStatistics)))
{
/ start of the statistics section in the DXL document
GPOS_ASSERT(nullptr == m_dxl_stats_derived_rel_array);
m_dxl_stats_derived_rel_array =
GPOS_NEW(m_mp) CDXLStatsDerivedRelationArray(m_mp);
}
else
{
/ currently we only have derived relation statistics objects
GPOS_ASSERT(nullptr != m_dxl_stats_derived_rel_array);
/ install a parse handler for the given element
CParseHandlerBase *parse_handler_base =
CParseHandlerFactory::GetParseHandler(m_mp, element_local_name,
m_parse_handler_mgr, this);
m_parse_handler_mgr->ActivateParseHandler(parse_handler_base);
/ store parse handler
this->Append(parse_handler_base);
parse_handler_base->startElement(element_uri, element_local_name,
element_qname, attrs);
}
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerStatistics::EndElement
/
/ @doc:
/ Invoked by Xerces to process a closing tag
/
/---------------------------------------------------------------------------
void
CParseHandlerStatistics::EndElement(const XMLCh *const, / element_uri,
const XMLCh *const element_local_name,
const XMLCh *const / element_qname
)
{
if (0 !=
XMLString::compareString(element_local_name,
CDXLTokens::XmlstrToken(EdxltokenStatistics)))
{
CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
str->GetBuffer());
}
GPOS_ASSERT(nullptr != m_dxl_stats_derived_rel_array);
const ULONG num_of_stats = this->Length();
for (ULONG idx = 0; idx < num_of_stats; idx++)
{
CParseHandlerStatsDerivedRelation *stats_derived_rel_parse_handler =
dynamic_cast<CParseHandlerStatsDerivedRelation *>((*this)[idx]);
CDXLStatsDerivedRelation *dxl_stats_derived_relation =
stats_derived_rel_parse_handler->GetDxlStatsDrvdRelation();
dxl_stats_derived_relation->AddRef();
m_dxl_stats_derived_rel_array->Append(dxl_stats_derived_relation);
}
m_parse_handler_mgr->DeactivateHandler();
}
/ EOF
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