greenplumn CParseHandlerWindowKeyList 源码

  • 2022-08-18
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greenplumn CParseHandlerWindowKeyList 代码

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

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2012 EMC Corp.
//
//	@filename:
//		CParseHandlerWindowKeyList.cpp
//
//	@doc:
//		Implementation of the SAX parse handler class for parsing the list of
//		window keys in the window operator
//---------------------------------------------------------------------------

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

#include "naucrates/dxl/operators/CDXLOperatorFactory.h"
#include "naucrates/dxl/parser/CParseHandlerFactory.h"
#include "naucrates/dxl/parser/CParseHandlerManager.h"
#include "naucrates/dxl/parser/CParseHandlerWindowKey.h"

using namespace gpdxl;

XERCES_CPP_NAMESPACE_USE

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

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerWindowKeyList::StartElement
//
//	@doc:
//		Invoked by Xerces to process an opening tag
//
//---------------------------------------------------------------------------
void
CParseHandlerWindowKeyList::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(EdxltokenWindowKeyList),
				 element_local_name))
	{
		m_dxl_window_key_array = GPOS_NEW(m_mp) CDXLWindowKeyArray(m_mp);
	}
	else if (0 == XMLString::compareString(
					  CDXLTokens::XmlstrToken(EdxltokenWindowKey),
					  element_local_name))
	{
		// we must have seen a window key list already
		GPOS_ASSERT(nullptr != m_dxl_window_key_array);
		// start new window key element
		CParseHandlerBase *window_key_parse_handler =
			CParseHandlerFactory::GetParseHandler(
				m_mp, CDXLTokens::XmlstrToken(EdxltokenWindowKey),
				m_parse_handler_mgr, this);
		m_parse_handler_mgr->ActivateParseHandler(window_key_parse_handler);

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

		window_key_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:
//		CParseHandlerWindowKeyList::EndElement
//
//	@doc:
//		Invoked by Xerces to process a closing tag
//
//---------------------------------------------------------------------------
void
CParseHandlerWindowKeyList::EndElement(const XMLCh *const,	// element_uri,
									   const XMLCh *const element_local_name,
									   const XMLCh *const  // element_qname
)
{
	if (0 != XMLString::compareString(
				 CDXLTokens::XmlstrToken(EdxltokenWindowKeyList),
				 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_array);

	const ULONG size = this->Length();
	// add the window keys to the list
	for (ULONG idx = 0; idx < size; idx++)
	{
		CParseHandlerWindowKey *window_key_parse_handler =
			dynamic_cast<CParseHandlerWindowKey *>((*this)[idx]);
		m_dxl_window_key_array->Append(
			window_key_parse_handler->GetDxlWindowKeyGen());
	}

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

// EOF

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