greenplumn CParseHandlerWindowKey 源码

greenplumn CParseHandlerWindowKey 代码

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

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2012 EMC Corp.
//
//	@filename:
//		CParseHandlerWindowKey.cpp
//
//	@doc:
//		Implementation of the SAX parse handler class for parsing the window key
//---------------------------------------------------------------------------

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

#include "naucrates/dxl/operators/CDXLOperatorFactory.h"
#include "naucrates/dxl/parser/CParseHandlerFactory.h"
#include "naucrates/dxl/parser/CParseHandlerScalarOp.h"
#include "naucrates/dxl/parser/CParseHandlerSortColList.h"
#include "naucrates/dxl/parser/CParseHandlerWindowFrame.h"

using namespace gpdxl;

XERCES_CPP_NAMESPACE_USE

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerWindowKey::CParseHandlerWindowKey
//
//	@doc:
//		Ctor
//
//---------------------------------------------------------------------------
CParseHandlerWindowKey::CParseHandlerWindowKey(
	CMemoryPool *mp, CParseHandlerManager *parse_handler_mgr,
	CParseHandlerBase *parse_handler_root)
	: CParseHandlerBase(mp, parse_handler_mgr, parse_handler_root),
	  m_dxl_window_key_gen(nullptr)
{
}

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerWindowKey::StartElement
//
//	@doc:
//		Invoked by Xerces to process an opening tag
//
//---------------------------------------------------------------------------
void
CParseHandlerWindowKey::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(EdxltokenWindowKey),
								 element_local_name))
	{
		GPOS_ASSERT(nullptr == m_dxl_window_key_gen);
		m_dxl_window_key_gen = GPOS_NEW(m_mp) CDXLWindowKey();

		// parse handler for the sorting column list
		CParseHandlerBase *sort_col_list_parse_handler =
			CParseHandlerFactory::GetParseHandler(
				m_mp, CDXLTokens::XmlstrToken(EdxltokenScalarSortColList),
				m_parse_handler_mgr, this);
		m_parse_handler_mgr->ActivateParseHandler(sort_col_list_parse_handler);

		// store parse handler
		this->Append(sort_col_list_parse_handler);
	}
	else if (0 == XMLString::compareString(
					  CDXLTokens::XmlstrToken(EdxltokenWindowFrame),
					  element_local_name))
	{
		GPOS_ASSERT(1 == this->Length());

		// parse handler for the leading and trailing scalar values
		CParseHandlerBase *window_frame_parse_handler_base =
			CParseHandlerFactory::GetParseHandler(
				m_mp, CDXLTokens::XmlstrToken(EdxltokenWindowFrame),
				m_parse_handler_mgr, this);
		m_parse_handler_mgr->ActivateParseHandler(
			window_frame_parse_handler_base);

		// store parse handler
		this->Append(window_frame_parse_handler_base);
		window_frame_parse_handler_base->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:
//		CParseHandlerWindowKey::EndElement
//
//	@doc:
//		Invoked by Xerces to process a closing tag
//
//---------------------------------------------------------------------------
void
CParseHandlerWindowKey::EndElement(const XMLCh *const,	// element_uri,
								   const XMLCh *const element_local_name,
								   const XMLCh *const  // element_qname
)
{
	if (0 !=
		XMLString::compareString(CDXLTokens::XmlstrToken(EdxltokenWindowKey),
								 element_local_name))
	{
		CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
			m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
		GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
				   str->GetBuffer());
	}
	GPOS_ASSERT(nullptr != m_dxl_window_key_gen);
	GPOS_ASSERT(1 <= this->Length());

	CParseHandlerSortColList *sort_col_list_parse_handler =
		dynamic_cast<CParseHandlerSortColList *>((*this)[0]);
	CDXLNode *sort_col_list_dxlnode =
		sort_col_list_parse_handler->CreateDXLNode();
	sort_col_list_dxlnode->AddRef();
	m_dxl_window_key_gen->SetSortColList(sort_col_list_dxlnode);

	if (2 == this->Length())
	{
		CParseHandlerWindowFrame *window_frame_parse_handler_base =
			dynamic_cast<CParseHandlerWindowFrame *>((*this)[1]);
		CDXLWindowFrame *window_frame =
			window_frame_parse_handler_base->GetWindowFrame();
		m_dxl_window_key_gen->SetWindowFrame(window_frame);
	}

	// 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