greenplumn CParseHandlerLogicalGet 源码

greenplumn CParseHandlerLogicalGet 代码

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

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2011 Greenplum, Inc.
//
//	@filename:
//		CParseHandlerLogicalGet.cpp
//
//	@doc:
//		Implementation of the SAX parse handler class for parsing logical get operators.
//---------------------------------------------------------------------------

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

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

using namespace gpdxl;


XERCES_CPP_NAMESPACE_USE

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerLogicalGet::CParseHandlerLogicalGet
//
//	@doc:
//		Constructor
//
//---------------------------------------------------------------------------
CParseHandlerLogicalGet::CParseHandlerLogicalGet(
	CMemoryPool *mp, CParseHandlerManager *parse_handler_mgr,
	CParseHandlerBase *parse_handler_root)
	: CParseHandlerLogicalOp(mp, parse_handler_mgr, parse_handler_root)
{
}

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerLogicalGet::StartElement
//
//	@doc:
//		Start element helper function
//
//---------------------------------------------------------------------------
void
CParseHandlerLogicalGet::StartElement(const XMLCh *const element_local_name,
									  Edxltoken token_type)
{
	if (0 != XMLString::compareString(CDXLTokens::XmlstrToken(token_type),
									  element_local_name))
	{
		CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
			m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
		GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
				   str->GetBuffer());
	}

	// create child node parsers

	// parse handler for table descriptor
	CParseHandlerBase *table_descr_parse_handler =
		CParseHandlerFactory::GetParseHandler(
			m_mp, CDXLTokens::XmlstrToken(EdxltokenTableDescr),
			m_parse_handler_mgr, this);
	m_parse_handler_mgr->ActivateParseHandler(table_descr_parse_handler);

	// store child parse handlers in array
	this->Append(table_descr_parse_handler);
}

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerLogicalGet::StartElement
//
//	@doc:
//		Invoked by Xerces to process an opening tag
//
//---------------------------------------------------------------------------
void
CParseHandlerLogicalGet::StartElement(const XMLCh *const,  // element_uri,
									  const XMLCh *const element_local_name,
									  const XMLCh *const,  // element_qname
									  const Attributes &   //attrs
)
{
	StartElement(element_local_name, EdxltokenLogicalGet);
}

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerLogicalGet::EndElement
//
//	@doc:
//		End element helper function
//
//---------------------------------------------------------------------------
void
CParseHandlerLogicalGet::EndElement(const XMLCh *const element_local_name,
									Edxltoken token_type)
{
	if (0 != XMLString::compareString(CDXLTokens::XmlstrToken(token_type),
									  element_local_name))
	{
		CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
			m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
		GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
				   str->GetBuffer());
	}

	CParseHandlerTableDescr *table_descr_parse_handler =
		dynamic_cast<CParseHandlerTableDescr *>((*this)[0]);

	GPOS_ASSERT(nullptr != table_descr_parse_handler->GetDXLTableDescr());

	CDXLTableDescr *table_descr = table_descr_parse_handler->GetDXLTableDescr();
	table_descr->AddRef();

	if (EdxltokenLogicalGet == token_type)
	{
		m_dxl_node = GPOS_NEW(m_mp)
			CDXLNode(m_mp, GPOS_NEW(m_mp) CDXLLogicalGet(m_mp, table_descr));
	}
	else
	{
		GPOS_ASSERT(EdxltokenLogicalExternalGet == token_type);
		m_dxl_node = GPOS_NEW(m_mp) CDXLNode(
			m_mp, GPOS_NEW(m_mp) CDXLLogicalExternalGet(m_mp, table_descr));
	}

#ifdef GPOS_DEBUG
	m_dxl_node->GetOperator()->AssertValid(m_dxl_node,
										   false /* validate_children */);
#endif	// GPOS_DEBUG

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

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerLogicalGet::EndElement
//
//	@doc:
//		Invoked by Xerces to process a closing tag
//
//---------------------------------------------------------------------------
void
CParseHandlerLogicalGet::EndElement(const XMLCh *const,	 // element_uri,
									const XMLCh *const element_local_name,
									const XMLCh *const	// element_qname
)
{
	EndElement(element_local_name, EdxltokenLogicalGet);
}

// EOF

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