greenplumn CParseHandlerCTEList 源码

greenplumn CParseHandlerCTEList 代码

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

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2012 EMC Corp.
//
//	@filename:
//		CParseHandlerCTEList.cpp
//
//	@doc:
//		Implementation of the SAX parse handler class for parsing CTE lists
//---------------------------------------------------------------------------

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

#include "naucrates/dxl/parser/CParseHandlerFactory.h"
#include "naucrates/dxl/parser/CParseHandlerLogicalCTEProducer.h"
#include "naucrates/dxl/parser/CParseHandlerManager.h"

using namespace gpdxl;

XERCES_CPP_NAMESPACE_USE

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerCTEList::CParseHandlerCTEList
//
//	@doc:
//		Ctor
//
//---------------------------------------------------------------------------
CParseHandlerCTEList::CParseHandlerCTEList(
	CMemoryPool *mp, CParseHandlerManager *parse_handler_mgr,
	CParseHandlerBase *parse_handler_root)
	: CParseHandlerBase(mp, parse_handler_mgr, parse_handler_root),
	  m_dxl_array(nullptr)
{
}

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerCTEList::~CParseHandlerCTEList
//
//	@doc:
//		Dtor
//
//---------------------------------------------------------------------------
CParseHandlerCTEList::~CParseHandlerCTEList()
{
	CRefCount::SafeRelease(m_dxl_array);
}

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerCTEList::StartElement
//
//	@doc:
//		Invoked by Xerces to process an opening tag
//
//---------------------------------------------------------------------------
void
CParseHandlerCTEList::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(EdxltokenCTEList),
									  element_local_name))
	{
		GPOS_ASSERT(nullptr == m_dxl_array);
		m_dxl_array = GPOS_NEW(m_mp) CDXLNodeArray(m_mp);
	}
	else if (0 == XMLString::compareString(
					  CDXLTokens::XmlstrToken(EdxltokenLogicalCTEProducer),
					  element_local_name))
	{
		GPOS_ASSERT(nullptr != m_dxl_array);

		// start new CTE producer
		CParseHandlerBase *cte_producer_parse_handler =
			CParseHandlerFactory::GetParseHandler(
				m_mp, CDXLTokens::XmlstrToken(EdxltokenLogicalCTEProducer),
				m_parse_handler_mgr, this);
		m_parse_handler_mgr->ActivateParseHandler(cte_producer_parse_handler);

		// store parse handler
		this->Append(cte_producer_parse_handler);

		cte_producer_parse_handler->startElement(
			element_uri, element_local_name, element_qname, attrs);
	}
	else
	{
		CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
			m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
		GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
				   str->GetBuffer());
	}
}

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

	const ULONG length = this->Length();

	// add CTEs
	for (ULONG ul = 0; ul < length; ul++)
	{
		CParseHandlerLogicalCTEProducer *cte_producer_parse_handler =
			dynamic_cast<CParseHandlerLogicalCTEProducer *>((*this)[ul]);
		CDXLNode *dxlnode_cte = cte_producer_parse_handler->CreateDXLNode();
		dxlnode_cte->AddRef();
		m_dxl_array->Append(dxlnode_cte);
	}

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

// EOF

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