greenplumn CParseHandlerSortColList 源码

  • 2022-08-18
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greenplumn CParseHandlerSortColList 代码

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

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2010 Greenplum, Inc.
//
//	@filename:
//		CParseHandlerSortColList.cpp
//
//	@doc:
//		Implementation of the SAX parse handler class for parsing sorting column lists.
//---------------------------------------------------------------------------

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

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


using namespace gpdxl;


XERCES_CPP_NAMESPACE_USE

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


//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerSortColList::StartElement
//
//	@doc:
//		Invoked by Xerces to process an opening tag
//
//---------------------------------------------------------------------------
void
CParseHandlerSortColList::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(EdxltokenScalarSortColList),
				 element_local_name))
	{
		// start the sorting column list
		m_dxl_node = GPOS_NEW(m_mp)
			CDXLNode(m_mp, GPOS_NEW(m_mp) CDXLScalarSortColList(m_mp));
	}
	else if (0 == XMLString::compareString(
					  CDXLTokens::XmlstrToken(EdxltokenScalarSortCol),
					  element_local_name))
	{
		// we must have seen a sorting col list already and initialized the sort col list node
		GPOS_ASSERT(nullptr != m_dxl_node);

		// start new sort column
		CParseHandlerBase *sort_col_parse_handler =
			CParseHandlerFactory::GetParseHandler(
				m_mp, CDXLTokens::XmlstrToken(EdxltokenScalarSortCol),
				m_parse_handler_mgr, this);
		m_parse_handler_mgr->ActivateParseHandler(sort_col_parse_handler);

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

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

	const ULONG length = this->Length();
	// add sorting columns from child parse handlers
	for (ULONG ul = 0; ul < length; ul++)
	{
		CParseHandlerSortCol *sort_col_parse_handler =
			dynamic_cast<CParseHandlerSortCol *>((*this)[ul]);
		AddChildFromParseHandler(sort_col_parse_handler);
	}

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

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

// EOF

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