greenplumn CParseHandlerScalarSubquery 源码

greenplumn CParseHandlerScalarSubquery 代码

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

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2011 EMC Corp.
//
//	@filename:
//		CParseHandlerScalarSubquery.cpp
//
//	@doc:
//		Implementation of the SAX parse handler class for parsing scalar subquery
//		operators.
//---------------------------------------------------------------------------

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

#include "naucrates/dxl/operators/CDXLOperatorFactory.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:
//		CParseHandlerScalarSubquery::CParseHandlerScalarSubquery
//
//	@doc:
//		Constructor
//
//---------------------------------------------------------------------------
CParseHandlerScalarSubquery::CParseHandlerScalarSubquery(
	CMemoryPool *mp, CParseHandlerManager *parse_handler_mgr,
	CParseHandlerBase *parse_handler_root)
	: CParseHandlerScalarOp(mp, parse_handler_mgr, parse_handler_root),
	  m_dxl_op(nullptr)
{
}


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

	// parse column id
	ULONG colid = CDXLOperatorFactory::ExtractConvertAttrValueToUlong(
		m_parse_handler_mgr->GetDXLMemoryManager(), attrs, EdxltokenColId,
		EdxltokenScalarSubquery);
	m_dxl_op = GPOS_NEW(m_mp) CDXLScalarSubquery(m_mp, colid);

	// parse handler for child node
	CParseHandlerBase *child_parse_handler =
		CParseHandlerFactory::GetParseHandler(
			m_mp, CDXLTokens::XmlstrToken(EdxltokenLogical),
			m_parse_handler_mgr, this);
	m_parse_handler_mgr->ActivateParseHandler(child_parse_handler);

	// store child parse handler in array
	this->Append(child_parse_handler);
}

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerScalarSubquery::EndElement
//
//	@doc:
//		Invoked by Xerces to process a closing tag
//
//---------------------------------------------------------------------------
void
CParseHandlerScalarSubquery::EndElement(const XMLCh *const,	 // element_uri,
										const XMLCh *const element_local_name,
										const XMLCh *const	// element_qname
)
{
	if (0 != XMLString::compareString(
				 CDXLTokens::XmlstrToken(EdxltokenScalarSubquery),
				 element_local_name))
	{
		CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
			m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
		GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
				   str->GetBuffer());
	}

	// construct node from parsed components
	GPOS_ASSERT(1 == this->Length());
	GPOS_ASSERT(nullptr != m_dxl_op);

	CParseHandlerLogicalOp *child_parse_handler =
		dynamic_cast<CParseHandlerLogicalOp *>((*this)[0]);

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

	// add constructed child
	AddChildFromParseHandler(child_parse_handler);

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

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

// EOF

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