greenplumn CParseHandlerScalarIdent 源码

greenplumn CParseHandlerScalarIdent 代码

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

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

#include "naucrates/dxl/parser/CParseHandlerScalarIdent.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:
//		CParseHandlerScalarIdent::CParseHandlerScalarIdent
//
//	@doc:
//		Constructor
//
//---------------------------------------------------------------------------
CParseHandlerScalarIdent::CParseHandlerScalarIdent(
	CMemoryPool *mp, CParseHandlerManager *parse_handler_mgr,
	CParseHandlerBase *parse_handler_root)
	: CParseHandlerScalarOp(mp, parse_handler_mgr, parse_handler_root),
	  m_dxl_op(nullptr)
{
}

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

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerScalarIdent::StartElement
//
//	@doc:
//		Invoked by Xerces to process an opening tag
//
//---------------------------------------------------------------------------
void
CParseHandlerScalarIdent::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(EdxltokenScalarIdent),
								 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 identifier operator
	m_dxl_op = (CDXLScalarIdent *) CDXLOperatorFactory::MakeDXLScalarIdent(
		m_parse_handler_mgr->GetDXLMemoryManager(), attrs);
}

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

	// construct scalar ident node
	GPOS_ASSERT(nullptr != m_dxl_op);
	m_dxl_node = GPOS_NEW(m_mp) CDXLNode(m_mp);
	m_dxl_node->SetOperator(m_dxl_op);

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

// EOF

相关信息

greenplumn 源码目录

相关文章

greenplumn CParseHandlerAgg 源码

greenplumn CParseHandlerAppend 源码

greenplumn CParseHandlerArray 源码

greenplumn CParseHandlerAssert 源码

greenplumn CParseHandlerBase 源码

greenplumn CParseHandlerBroadcastMotion 源码

greenplumn CParseHandlerCTEConfig 源码

greenplumn CParseHandlerCTEList 源码

greenplumn CParseHandlerColDescr 源码

greenplumn CParseHandlerColStats 源码