greenplumn CParseHandlerProjList 源码

greenplumn CParseHandlerProjList 代码

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

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

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

#include "naucrates/dxl/operators/CDXLOperatorFactory.h"
#include "naucrates/dxl/operators/CDXLScalarProjList.h"
#include "naucrates/dxl/parser/CParseHandlerFactory.h"
#include "naucrates/dxl/parser/CParseHandlerProjElem.h"
#include "naucrates/dxl/parser/CParseHandlerScalarOp.h"


using namespace gpdxl;


XERCES_CPP_NAMESPACE_USE

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

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerProjList::StartElement
//
//	@doc:
//		Invoked by Xerces to process an opening tag
//
//---------------------------------------------------------------------------
void
CParseHandlerProjList::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(EdxltokenScalarProjList),
				 element_local_name))
	{
		// start the proj list
		m_dxl_node = GPOS_NEW(m_mp)
			CDXLNode(m_mp, GPOS_NEW(m_mp) CDXLScalarProjList(m_mp));
	}
	else if (0 == XMLString::compareString(
					  CDXLTokens::XmlstrToken(EdxltokenScalarProjElem),
					  element_local_name))
	{
		// we must have seen a proj list already and initialized the proj list node
		GPOS_ASSERT(nullptr != m_dxl_node);

		// start new project element
		CParseHandlerBase *parse_handler_proj_element =
			CParseHandlerFactory::GetParseHandler(
				m_mp, CDXLTokens::XmlstrToken(EdxltokenScalarProjElem),
				m_parse_handler_mgr, this);
		m_parse_handler_mgr->ActivateParseHandler(parse_handler_proj_element);

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

		parse_handler_proj_element->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:
//		CParseHandlerProjList::EndElement
//
//	@doc:
//		Invoked by Xerces to process a closing tag
//
//---------------------------------------------------------------------------
void
CParseHandlerProjList::EndElement(const XMLCh *const,  // element_uri,
								  const XMLCh *const element_local_name,
								  const XMLCh *const  // element_qname
)
{
	if (0 != XMLString::compareString(
				 CDXLTokens::XmlstrToken(EdxltokenScalarProjList),
				 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 size = this->Length();
	// add constructed children from child parse handlers
	for (ULONG ul = 0; ul < size; ul++)
	{
		CParseHandlerProjElem *parse_handler_proj_element =
			dynamic_cast<CParseHandlerProjElem *>((*this)[ul]);
		AddChildFromParseHandler(parse_handler_proj_element);
	}

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

// EOF

相关信息

greenplumn 源码目录

相关文章

greenplumn CParseHandlerAgg 源码

greenplumn CParseHandlerAppend 源码

greenplumn CParseHandlerArray 源码

greenplumn CParseHandlerAssert 源码

greenplumn CParseHandlerBase 源码

greenplumn CParseHandlerBroadcastMotion 源码

greenplumn CParseHandlerCTEConfig 源码

greenplumn CParseHandlerCTEList 源码

greenplumn CParseHandlerColDescr 源码

greenplumn CParseHandlerColStats 源码