greenplumn CParseHandlerScalarSwitchCase 源码

  • 2022-08-18
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greenplumn CParseHandlerScalarSwitchCase 代码

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

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2012 EMC Corp.
//
//	@filename:
//		CParseHandlerScalarSwitchCase.cpp
//
//	@doc:
//
//		Implementation of the SAX parse handler class for a SwitchCase operator
//---------------------------------------------------------------------------


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

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

using namespace gpdxl;

XERCES_CPP_NAMESPACE_USE

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

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

	// create and activate the parse handler for the children nodes in reverse
	// order of their expected appearance

	// parse handler for result expression
	CParseHandlerBase *parse_handler_result =
		CParseHandlerFactory::GetParseHandler(
			m_mp, CDXLTokens::XmlstrToken(EdxltokenScalar), m_parse_handler_mgr,
			this);
	m_parse_handler_mgr->ActivateParseHandler(parse_handler_result);

	// parse handler for condition expression
	CParseHandlerBase *parse_handler_condition_expr =
		CParseHandlerFactory::GetParseHandler(
			m_mp, CDXLTokens::XmlstrToken(EdxltokenScalar), m_parse_handler_mgr,
			this);
	m_parse_handler_mgr->ActivateParseHandler(parse_handler_condition_expr);

	// store parse handlers
	this->Append(parse_handler_condition_expr);
	this->Append(parse_handler_result);
}

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

	// construct node
	m_dxl_node = GPOS_NEW(m_mp)
		CDXLNode(m_mp, GPOS_NEW(m_mp) CDXLScalarSwitchCase(m_mp));

	CParseHandlerScalarOp *parse_handler_condition_expr =
		dynamic_cast<CParseHandlerScalarOp *>((*this)[0]);
	CParseHandlerScalarOp *parse_handler_result =
		dynamic_cast<CParseHandlerScalarOp *>((*this)[1]);

	// add constructed children
	AddChildFromParseHandler(parse_handler_condition_expr);
	AddChildFromParseHandler(parse_handler_result);

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

//EOF

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