greenplumn CParseHandlerScalarConstValue 源码

  • 2022-08-18
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greenplumn CParseHandlerScalarConstValue 代码

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

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2010 Greenplum, Inc.
//
//	@filename:
//		CParseHandlerScalarConstValue.cpp
//
//	@doc:
//
//		Implementation of the SAX parse handler class for parsing scalar ConstVal.
//---------------------------------------------------------------------------

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

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


using namespace gpdxl;


XERCES_CPP_NAMESPACE_USE

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


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

	// parse and create scalar const operator
	CDXLScalarConstValue *dxl_op =
		(CDXLScalarConstValue *) CDXLOperatorFactory::MakeDXLConstValue(
			m_parse_handler_mgr->GetDXLMemoryManager(), attrs);

	// construct scalar Const node
	GPOS_ASSERT(nullptr != dxl_op);
	m_dxl_node = GPOS_NEW(m_mp) CDXLNode(m_mp);
	m_dxl_node->SetOperator(dxl_op);
}

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