greenplumn CParseHandlerLogicalInsert 源码

greenplumn CParseHandlerLogicalInsert 代码

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

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

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

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

using namespace gpdxl;


XERCES_CPP_NAMESPACE_USE

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

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

	const XMLCh *src_colids_xml = CDXLOperatorFactory::ExtractAttrValue(
		attrs, EdxltokenInsertCols, EdxltokenLogicalInsert);
	m_pdrgpul = CDXLOperatorFactory::ExtractIntsToUlongArray(
		m_parse_handler_mgr->GetDXLMemoryManager(), src_colids_xml,
		EdxltokenInsertCols, EdxltokenLogicalInsert);

	// create child node parsers

	// parse handler for logical operator
	CParseHandlerBase *child_parse_handler =
		CParseHandlerFactory::GetParseHandler(
			m_mp, CDXLTokens::XmlstrToken(EdxltokenLogical),
			m_parse_handler_mgr, this);
	m_parse_handler_mgr->ActivateParseHandler(child_parse_handler);

	//parse handler for the table descriptor
	CParseHandlerBase *pphTabDesc = CParseHandlerFactory::GetParseHandler(
		m_mp, CDXLTokens::XmlstrToken(EdxltokenTableDescr), m_parse_handler_mgr,
		this);
	m_parse_handler_mgr->ActivateParseHandler(pphTabDesc);

	// store child parse handler in array
	this->Append(pphTabDesc);
	this->Append(child_parse_handler);
}

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerLogicalInsert::EndElement
//
//	@doc:
//		Invoked by Xerces to process a closing tag
//
//---------------------------------------------------------------------------
void
CParseHandlerLogicalInsert::EndElement(const XMLCh *const,	// element_uri,
									   const XMLCh *const element_local_name,
									   const XMLCh *const  // element_qname
)
{
	if (0 != XMLString::compareString(
				 CDXLTokens::XmlstrToken(EdxltokenLogicalInsert),
				 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(2 == this->Length());

	CParseHandlerTableDescr *pphTabDesc =
		dynamic_cast<CParseHandlerTableDescr *>((*this)[0]);
	CParseHandlerLogicalOp *child_parse_handler =
		dynamic_cast<CParseHandlerLogicalOp *>((*this)[1]);

	GPOS_ASSERT(nullptr != pphTabDesc->GetDXLTableDescr());
	GPOS_ASSERT(nullptr != child_parse_handler->CreateDXLNode());

	CDXLTableDescr *table_descr = pphTabDesc->GetDXLTableDescr();
	table_descr->AddRef();

	m_dxl_node = GPOS_NEW(m_mp) CDXLNode(
		m_mp, GPOS_NEW(m_mp) CDXLLogicalInsert(m_mp, table_descr, m_pdrgpul));

	AddChildFromParseHandler(child_parse_handler);

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

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

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