greenplumn CParseHandlerScalarValuesList 源码

2022-08-18
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greenplumn CParseHandlerScalarValuesList 代码

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

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2017 VMware, Inc. or its affiliates.
//
//	@filename:
//		CParseHandlerScalarValuesList.cpp
//
//	@doc:
//		Implementation of the SAX parse handler class for parsing value list.
//---------------------------------------------------------------------------

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

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

using namespace gpdxl;


XERCES_CPP_NAMESPACE_USE

// ctor
CParseHandlerScalarValuesList::CParseHandlerScalarValuesList(
	CMemoryPool *mp, CParseHandlerManager *parse_handler_mgr,
	CParseHandlerBase *parse_handler_root)
	: CParseHandlerOp(mp, parse_handler_mgr, parse_handler_root)
{
}

// invoked by Xerces to process an opening tag
void
CParseHandlerScalarValuesList::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(EdxltokenScalarValuesList),
				 element_local_name))
	{
		CDXLScalarValuesList *dxl_op =
			GPOS_NEW(m_mp) CDXLScalarValuesList(m_mp);
		m_dxl_node = GPOS_NEW(m_mp) CDXLNode(m_mp, dxl_op);
	}
	else
	{
		CParseHandlerBase *parse_handler_const_value =
			CParseHandlerFactory::GetParseHandler(m_mp, element_local_name,
												  m_parse_handler_mgr, this);
		m_parse_handler_mgr->ActivateParseHandler(parse_handler_const_value);

		this->Append(parse_handler_const_value);

		parse_handler_const_value->startElement(element_uri, element_local_name,
												element_qname, attrs);
	}
}

// invoked by Xerces to process a closing tag
void
CParseHandlerScalarValuesList::EndElement(
	const XMLCh *const,	 // element_uri,
	const XMLCh *const,	 //element_local_name,
	const XMLCh *const	 // element_qname
)
{
	const ULONG arity = this->Length();
	for (ULONG ul = 0; ul < arity; ul++)
	{
		CParseHandlerScalarOp *child_parse_handler =
			dynamic_cast<CParseHandlerScalarOp *>((*this)[ul]);
		AddChildFromParseHandler(child_parse_handler);
	}
	m_parse_handler_mgr->DeactivateHandler();
}
// EOF

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