greenplumn CParseHandlerProperties 源码

greenplumn CParseHandlerProperties 代码

文件路径：/src/backend/gporca/libnaucrates/src/parser/CParseHandlerProperties.cpp

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2010 Greenplum, Inc.
//
//	@filename:
//		CParseHandlerProperties.cpp
//
//	@doc:
//		Implementation of the SAX parse handler class for parsing physical properties.
//---------------------------------------------------------------------------

#include "naucrates/dxl/parser/CParseHandlerProperties.h"

#include "naucrates/dxl/parser/CParseHandlerCost.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:
//		CParseHandlerProperties::CParseHandlerProperties
//
//	@doc:
//		Ctor
//
//---------------------------------------------------------------------------
CParseHandlerProperties::CParseHandlerProperties(
	CMemoryPool *mp, CParseHandlerManager *parse_handler_mgr,
	CParseHandlerBase *parse_handler_root)
	: CParseHandlerBase(mp, parse_handler_mgr, parse_handler_root),
	  m_dxl_properties(nullptr),
	  m_dxl_stats_derived_relation(nullptr)
{
}

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerProperties::~CParseHandlerProperties
//
//	@doc:
//		Dtor
//
//---------------------------------------------------------------------------
CParseHandlerProperties::~CParseHandlerProperties()
{
	CRefCount::SafeRelease(m_dxl_properties);
	CRefCount::SafeRelease(m_dxl_stats_derived_relation);
}

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerProperties::GetProperties
//
//	@doc:
//		Destructor
//
//---------------------------------------------------------------------------
CDXLPhysicalProperties *
CParseHandlerProperties::GetProperties() const
{
	GPOS_ASSERT(nullptr != m_dxl_properties);
	return m_dxl_properties;
}

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerProperties::StartElement
//
//	@doc:
//		Invoked by Xerces to process an opening tag
//
//---------------------------------------------------------------------------
void
CParseHandlerProperties::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(EdxltokenProperties),
								 element_local_name))
	{
		// create and install cost and output column parsers
		CParseHandlerBase *parse_handler_root =
			CParseHandlerFactory::GetParseHandler(
				m_mp, CDXLTokens::XmlstrToken(EdxltokenCost),
				m_parse_handler_mgr, this);
		m_parse_handler_mgr->ActivateParseHandler(parse_handler_root);

		// store parse handler
		this->Append(parse_handler_root);
	}
	else if (0 == XMLString::compareString(
					  CDXLTokens::XmlstrToken(EdxltokenStatsDerivedRelation),
					  element_local_name))
	{
		GPOS_ASSERT(1 == this->Length());

		// create and install derived relation statistics parsers
		CParseHandlerBase *parse_handler_stats =
			CParseHandlerFactory::GetParseHandler(
				m_mp, CDXLTokens::XmlstrToken(EdxltokenStatsDerivedRelation),
				m_parse_handler_mgr, this);
		m_parse_handler_mgr->ActivateParseHandler(parse_handler_stats);

		// store parse handler
		this->Append(parse_handler_stats);

		parse_handler_stats->startElement(element_uri, element_local_name,
										  element_qname, attrs);
	}
	else
	{
		CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
			m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
		GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
				   str->GetBuffer());
	}
}

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerProperties::EndElement
//
//	@doc:
//		Invoked by Xerces to process a closing tag
//
//---------------------------------------------------------------------------
void
CParseHandlerProperties::EndElement(const XMLCh *const,	 // element_uri,
									const XMLCh *const element_local_name,
									const XMLCh *const	// element_qname
)
{
	if (0 !=
		XMLString::compareString(CDXLTokens::XmlstrToken(EdxltokenProperties),
								 element_local_name))
	{
		CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
			m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
		GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
				   str->GetBuffer());
	}

	GPOS_ASSERT((1 == this->Length()) || (2 == this->Length()));

	// assemble the properties container from the cost
	CParseHandlerCost *parse_handler_cost =
		dynamic_cast<CParseHandlerCost *>((*this)[0]);

	CDXLOperatorCost *cost = parse_handler_cost->GetDXLOperatorCost();
	cost->AddRef();

	if (2 == this->Length())
	{
		CParseHandlerStatsDerivedRelation *parse_handler_stats =
			dynamic_cast<CParseHandlerStatsDerivedRelation *>((*this)[1]);

		CDXLStatsDerivedRelation *dxl_stats_derived_relation =
			parse_handler_stats->GetDxlStatsDrvdRelation();
		dxl_stats_derived_relation->AddRef();
		m_dxl_stats_derived_relation = dxl_stats_derived_relation;
	}

	m_dxl_properties = GPOS_NEW(m_mp) CDXLPhysicalProperties(cost);

	// deactivate handler
	m_parse_handler_mgr->DeactivateHandler();
}

// EOF

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