greenplumn CParseHandlerLogicalProject 源码

greenplumn CParseHandlerLogicalProject 代码

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

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2011 Greenplum, Inc.
//
//	@filename:
//		CParseHandlerLogicalProject.cpp
//
//	@doc:
//		Implementation of the SAX parse handler class for parsing logical
//		project operators.
//---------------------------------------------------------------------------

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

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

using namespace gpdxl;


XERCES_CPP_NAMESPACE_USE

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

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerLogicalProject::~CParseHandlerLogicalProject
//
//	@doc:
//		Destructor
//
//---------------------------------------------------------------------------
CParseHandlerLogicalProject::~CParseHandlerLogicalProject() = default;

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerLogicalProject::StartElement
//
//	@doc:
//		Invoked by Xerces to process an opening tag
//
//---------------------------------------------------------------------------
void
CParseHandlerLogicalProject::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(EdxltokenLogicalProject),
				 element_local_name))
	{
		m_dxl_node = GPOS_NEW(m_mp)
			CDXLNode(m_mp, GPOS_NEW(m_mp) CDXLLogicalProject(m_mp));

		// 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 proj list
		CParseHandlerBase *proj_list_parse_handler =
			CParseHandlerFactory::GetParseHandler(
				m_mp, CDXLTokens::XmlstrToken(EdxltokenScalarProjList),
				m_parse_handler_mgr, this);
		m_parse_handler_mgr->ActivateParseHandler(proj_list_parse_handler);


		// store child parse handler in array
		this->Append(proj_list_parse_handler);
		this->Append(child_parse_handler);
	}
	else
	{
		CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
			m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
		GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
				   str->GetBuffer());
	}
}

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

	CParseHandlerProjList *proj_list_parse_handler =
		dynamic_cast<CParseHandlerProjList *>((*this)[0]);
	CParseHandlerLogicalOp *child_parse_handler =
		dynamic_cast<CParseHandlerLogicalOp *>((*this)[1]);

	GPOS_ASSERT(nullptr != proj_list_parse_handler->CreateDXLNode());
	GPOS_ASSERT(nullptr != child_parse_handler->CreateDXLNode());

	AddChildFromParseHandler(proj_list_parse_handler);
	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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