greenplumn CParseHandlerLogicalCTEProducer 源码

greenplumn CParseHandlerLogicalCTEProducer 代码

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

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2012 EMC Corp.
//
//	@filename:
//		CParseHandlerLogicalCTEProducer.cpp
//
//	@doc:
//		Implementation of the SAX parse handler class for parsing CTE producer
//		operators
//---------------------------------------------------------------------------

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

#include "naucrates/dxl/operators/CDXLLogicalCTEProducer.h"
#include "naucrates/dxl/operators/CDXLOperatorFactory.h"
#include "naucrates/dxl/parser/CParseHandlerFactory.h"

using namespace gpdxl;

XERCES_CPP_NAMESPACE_USE

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerLogicalCTEProducer::CParseHandlerLogicalCTEProducer
//
//	@doc:
//		Ctor
//
//---------------------------------------------------------------------------
CParseHandlerLogicalCTEProducer::CParseHandlerLogicalCTEProducer(
	CMemoryPool *mp, CParseHandlerManager *parse_handler_mgr,
	CParseHandlerBase *parse_handler_root)
	: CParseHandlerLogicalOp(mp, parse_handler_mgr, parse_handler_root)
{
}

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerLogicalCTEProducer::StartElement
//
//	@doc:
//		Invoked by Xerces to process an opening tag
//
//---------------------------------------------------------------------------
void
CParseHandlerLogicalCTEProducer::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(EdxltokenLogicalCTEProducer),
				 element_local_name))
	{
		CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
			m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
		GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
				   str->GetBuffer());
	}

	// parse cteid and create cte operator
	ULONG id = CDXLOperatorFactory::ExtractConvertAttrValueToUlong(
		m_parse_handler_mgr->GetDXLMemoryManager(), attrs, EdxltokenCTEId,
		EdxltokenLogicalCTEProducer);

	ULongPtrArray *output_colids_array =
		CDXLOperatorFactory::ExtractConvertValuesToArray(
			m_parse_handler_mgr->GetDXLMemoryManager(), attrs, EdxltokenColumns,
			EdxltokenLogicalCTEProducer);

	m_dxl_node = GPOS_NEW(m_mp) CDXLNode(
		m_mp,
		GPOS_NEW(m_mp) CDXLLogicalCTEProducer(m_mp, id, output_colids_array));

	// create and activate the parse handler for the child expression node
	CParseHandlerBase *child_parse_handler =
		CParseHandlerFactory::GetParseHandler(
			m_mp, CDXLTokens::XmlstrToken(EdxltokenLogical),
			m_parse_handler_mgr, this);
	m_parse_handler_mgr->ActivateParseHandler(child_parse_handler);

	// store parse handler
	this->Append(child_parse_handler);
}

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerLogicalCTEProducer::EndElement
//
//	@doc:
//		Invoked by Xerces to process a closing tag
//
//---------------------------------------------------------------------------
void
CParseHandlerLogicalCTEProducer::EndElement(
	const XMLCh *const,	 // element_uri,
	const XMLCh *const element_local_name,
	const XMLCh *const	// element_qname
)
{
	if (0 != XMLString::compareString(
				 CDXLTokens::XmlstrToken(EdxltokenLogicalCTEProducer),
				 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(nullptr != m_dxl_node);

	CParseHandlerLogicalOp *child_parse_handler =
		dynamic_cast<CParseHandlerLogicalOp *>((*this)[0]);
	AddChildFromParseHandler(child_parse_handler);

#ifdef GPOS_DEBUG
	m_dxl_node->GetOperator()->AssertValid(m_dxl_node,
										   false /* validate_children */);
#endif	// GPOS_DEBUG

	m_parse_handler_mgr->DeactivateHandler();
}

// EOF

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