greenplumn CParseHandlerLogicalTVF 源码

greenplumn CParseHandlerLogicalTVF 代码

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

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2012 EMC Corp.
//
//	@filename:
//		CParseHandlerLogicalTVF.cpp
//
//	@doc:
//
//		Implementation of the SAX parse handler class for parsing table-valued
//		functions
//---------------------------------------------------------------------------

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

#include "naucrates/dxl/CDXLUtils.h"
#include "naucrates/dxl/operators/CDXLLogicalTVF.h"
#include "naucrates/dxl/operators/CDXLOperatorFactory.h"
#include "naucrates/dxl/parser/CParseHandlerColDescr.h"
#include "naucrates/dxl/parser/CParseHandlerFactory.h"
#include "naucrates/dxl/parser/CParseHandlerLogicalOp.h"
#include "naucrates/dxl/parser/CParseHandlerScalarOp.h"

using namespace gpdxl;

XERCES_CPP_NAMESPACE_USE

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerLogicalTVF::CParseHandlerLogicalTVF
//
//	@doc:
//		Ctor
//
//---------------------------------------------------------------------------
CParseHandlerLogicalTVF::CParseHandlerLogicalTVF(
	CMemoryPool *mp, CParseHandlerManager *parse_handler_mgr,
	CParseHandlerBase *parse_handler_root)
	: CParseHandlerLogicalOp(mp, parse_handler_mgr, parse_handler_root),
	  m_func_mdid(nullptr),
	  m_return_type_mdid(nullptr),
	  m_mdname(nullptr)
{
}

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerLogicalTVF::StartElement
//
//	@doc:
//		Processes a Xerces start element event
//
//---------------------------------------------------------------------------
void
CParseHandlerLogicalTVF::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(EdxltokenLogicalTVF),
								 element_local_name))
	{
		// parse function id
		m_func_mdid = CDXLOperatorFactory::ExtractConvertAttrValueToMdId(
			m_parse_handler_mgr->GetDXLMemoryManager(), attrs, EdxltokenFuncId,
			EdxltokenLogicalTVF);

		// parse function name
		const XMLCh *func_name = CDXLOperatorFactory::ExtractAttrValue(
			attrs, EdxltokenName, EdxltokenLogicalTVF);

		CWStringDynamic *func_name_str =
			CDXLUtils::CreateDynamicStringFromXMLChArray(
				m_parse_handler_mgr->GetDXLMemoryManager(), func_name);
		m_mdname = GPOS_NEW(m_mp) CMDName(m_mp, func_name_str);
		GPOS_DELETE(func_name_str);

		// parse function return type
		m_return_type_mdid = CDXLOperatorFactory::ExtractConvertAttrValueToMdId(
			m_parse_handler_mgr->GetDXLMemoryManager(), attrs, EdxltokenTypeId,
			EdxltokenLogicalTVF);
	}
	else if (0 ==
			 XMLString::compareString(CDXLTokens::XmlstrToken(EdxltokenColumns),
									  element_local_name))
	{
		// parse handler for columns
		CParseHandlerBase *cold_descr_parse_handler =
			CParseHandlerFactory::GetParseHandler(
				m_mp, CDXLTokens::XmlstrToken(EdxltokenColumns),
				m_parse_handler_mgr, this);
		m_parse_handler_mgr->ActivateParseHandler(cold_descr_parse_handler);

		// store parse handlers
		this->Append(cold_descr_parse_handler);

		cold_descr_parse_handler->startElement(element_uri, element_local_name,
											   element_qname, attrs);
	}
	else
	{
		// parse scalar child
		CParseHandlerBase *child_parse_handler =
			CParseHandlerFactory::GetParseHandler(
				m_mp, CDXLTokens::XmlstrToken(EdxltokenScalar),
				m_parse_handler_mgr, this);
		m_parse_handler_mgr->ActivateParseHandler(child_parse_handler);

		// store parse handlers
		this->Append(child_parse_handler);

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

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerLogicalTVF::EndElement
//
//	@doc:
//		Processes a Xerces end element event
//
//---------------------------------------------------------------------------
void
CParseHandlerLogicalTVF::EndElement(const XMLCh *const,	 // element_uri,
									const XMLCh *const element_local_name,
									const XMLCh *const	// element_qname
)
{
	if (0 !=
		XMLString::compareString(CDXLTokens::XmlstrToken(EdxltokenLogicalTVF),
								 element_local_name))
	{
		CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
			m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
		GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
				   str->GetBuffer());
	}

	CParseHandlerColDescr *col_descr_parse_handler =
		dynamic_cast<CParseHandlerColDescr *>((*this)[0]);

	GPOS_ASSERT(nullptr != col_descr_parse_handler);

	// get column descriptors
	CDXLColDescrArray *cold_descr_dxl_array =
		col_descr_parse_handler->GetDXLColumnDescrArray();
	GPOS_ASSERT(nullptr != cold_descr_dxl_array);

	cold_descr_dxl_array->AddRef();
	CDXLLogicalTVF *lg_tvf_op = GPOS_NEW(m_mp) CDXLLogicalTVF(
		m_mp, m_func_mdid, m_return_type_mdid, m_mdname, cold_descr_dxl_array);

	m_dxl_node = GPOS_NEW(m_mp) CDXLNode(m_mp, lg_tvf_op);

	const ULONG length = this->Length();
	// loop over arglist children and add them to this parsehandler
	for (ULONG idx = 1; idx < length; idx++)
	{
		CParseHandlerScalarOp *child_parse_handler =
			dynamic_cast<CParseHandlerScalarOp *>((*this)[idx]);
		AddChildFromParseHandler(child_parse_handler);
	}

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

// EOF

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