greenplumn CParseHandlerWindowKeyList 源码

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

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