greenplumn CParseHandlerScalarSubPlanParam 源码

  • 2022-08-18
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greenplumn CParseHandlerScalarSubPlanParam 代码

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

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2012 EMC Corp.
//
//	@filename:
//		CParseHandlerScalarSubPlanParam.cpp
//
//	@doc:
//
//		Implementation of the SAX parse handler class for parsing a Param of
//		a scalar SubPlan
//---------------------------------------------------------------------------

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

#include "naucrates/dxl/CDXLUtils.h"
#include "naucrates/dxl/operators/CDXLOperatorFactory.h"
#include "naucrates/dxl/parser/CParseHandlerFactory.h"
#include "naucrates/dxl/parser/CParseHandlerPhysicalOp.h"
#include "naucrates/dxl/parser/CParseHandlerScalarOp.h"

using namespace gpdxl;


XERCES_CPP_NAMESPACE_USE

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerScalarSubPlanParam::CParseHandlerScalarSubPlanParam
//
//	@doc:
//		Ctor
//
//---------------------------------------------------------------------------
CParseHandlerScalarSubPlanParam::CParseHandlerScalarSubPlanParam(
	CMemoryPool *mp, CParseHandlerManager *parse_handler_mgr,
	CParseHandlerBase *parse_handler_root)
	: CParseHandlerScalarOp(mp, parse_handler_mgr, parse_handler_root),
	  m_dxl_colref(nullptr)
{
}

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerScalarSubPlanParam::~CParseHandlerScalarSubPlanParam
//
//	@doc:
//		Dtor
//
//---------------------------------------------------------------------------
CParseHandlerScalarSubPlanParam::~CParseHandlerScalarSubPlanParam()
{
	m_dxl_colref->Release();
}

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerScalarSubPlanParam::StartElement
//
//	@doc:
//		Processes a Xerces start element event
//
//---------------------------------------------------------------------------
void
CParseHandlerScalarSubPlanParam::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(EdxltokenScalarSubPlanParam),
				 element_local_name))
	{
		CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
			m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
		GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
				   str->GetBuffer());
	}

	m_dxl_colref = CDXLOperatorFactory::MakeDXLColRef(
		m_parse_handler_mgr->GetDXLMemoryManager(), attrs,
		EdxltokenScalarSubPlanParam);
}

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerScalarSubPlanParam::EndElement
//
//	@doc:
//		Processes a Xerces end element event
//
//---------------------------------------------------------------------------
void
CParseHandlerScalarSubPlanParam::EndElement(
	const XMLCh *const,	 // element_uri,
	const XMLCh *const element_local_name,
	const XMLCh *const	// element_qname
)
{
	if (0 != XMLString::compareString(
				 CDXLTokens::XmlstrToken(EdxltokenScalarSubPlanParam),
				 element_local_name) &&
		nullptr != m_dxl_node)
	{
		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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