greenplumn CParseHandlerScalarPartListNullTest 源码

  • 2022-08-18
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greenplumn CParseHandlerScalarPartListNullTest 代码

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

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2017 VMware, Inc. or its affiliates.
//
//	Implementation of the SAX parse handler class for parsing part list
//	null test
//---------------------------------------------------------------------------

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

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

using namespace gpdxl;

XERCES_CPP_NAMESPACE_USE

// Ctor
CParseHandlerScalarPartListNullTest::CParseHandlerScalarPartListNullTest(
	CMemoryPool *mp, CParseHandlerManager *parse_handler_mgr,
	CParseHandlerBase *parse_handler_root)
	: CParseHandlerScalarOp(mp, parse_handler_mgr, parse_handler_root)
{
}

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

	ULONG partition_level = CDXLOperatorFactory::ExtractConvertAttrValueToUlong(
		m_parse_handler_mgr->GetDXLMemoryManager(), attrs, EdxltokenPartLevel,
		EdxltokenScalarPartListNullTest);
	BOOL is_null = CDXLOperatorFactory::ExtractConvertAttrValueToBool(
		m_parse_handler_mgr->GetDXLMemoryManager(), attrs,
		EdxltokenScalarIsNull, EdxltokenScalarPartListNullTest);

	m_dxl_node =
		GPOS_NEW(m_mp) CDXLNode(m_mp, GPOS_NEW(m_mp) CDXLScalarPartListNullTest(
										  m_mp, partition_level, is_null));
}

// Invoked by Xerces to process a closing tag
void
CParseHandlerScalarPartListNullTest::EndElement(
	const XMLCh *const,	 // element_uri,
	const XMLCh *const element_local_name,
	const XMLCh *const	// element_qname
)
{
	if (0 != XMLString::compareString(
				 CDXLTokens::XmlstrToken(EdxltokenScalarPartListNullTest),
				 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);

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

// EOF

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