greenplumn CParseHandlerNLJIndexParamList 源码

greenplumn CParseHandlerNLJIndexParamList 代码

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

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2018 VMware, Inc. or its affiliates.
//
//	@filename:
//		CParseHandlerNLJIndexParamList.cpp
//
//	@doc:
//
//		Implementation of the SAX parse handler class for parsing the ParamList
//---------------------------------------------------------------------------

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

#include "naucrates/dxl/CDXLUtils.h"
#include "naucrates/dxl/operators/CDXLOperatorFactory.h"
#include "naucrates/dxl/parser/CParseHandlerFactory.h"
#include "naucrates/dxl/parser/CParseHandlerNLJIndexParam.h"
#include "naucrates/dxl/parser/CParseHandlerScalarOp.h"

using namespace gpdxl;


XERCES_CPP_NAMESPACE_USE

// ctor
CParseHandlerNLJIndexParamList::CParseHandlerNLJIndexParamList(
	CMemoryPool *mp, CParseHandlerManager *parse_handler_mgr,
	CParseHandlerBase *parse_handler_root)
	: CParseHandlerBase(mp, parse_handler_mgr, parse_handler_root)
{
	m_nest_params_colrefs_array = GPOS_NEW(mp) CDXLColRefArray(mp);
	m_is_param_list = false;
}

// ctor
CParseHandlerNLJIndexParamList::~CParseHandlerNLJIndexParamList()
{
	m_nest_params_colrefs_array->Release();
}


// processes a Xerces start element event
void
CParseHandlerNLJIndexParamList::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(EdxltokenNLJIndexParamList),
				 element_local_name))
	{
		// we can't have seen a paramlist already
		GPOS_ASSERT(!m_is_param_list);
		// start the paramlist
		m_is_param_list = true;
	}
	else if (0 == XMLString::compareString(
					  CDXLTokens::XmlstrToken(EdxltokenNLJIndexParam),
					  element_local_name))
	{
		// we must have seen a paramlist already
		GPOS_ASSERT(m_is_param_list);

		// start new param
		CParseHandlerBase *nest_param_parse_handler =
			CParseHandlerFactory::GetParseHandler(
				m_mp, CDXLTokens::XmlstrToken(EdxltokenNLJIndexParam),
				m_parse_handler_mgr, this);
		m_parse_handler_mgr->ActivateParseHandler(nest_param_parse_handler);

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

		nest_param_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());
	}
}

// processes a Xerces end element event
void
CParseHandlerNLJIndexParamList::EndElement(
	const XMLCh *const,	 // element_uri,
	const XMLCh *const element_local_name,
	const XMLCh *const	// element_qname
)
{
	if (0 != XMLString::compareString(
				 CDXLTokens::XmlstrToken(EdxltokenNLJIndexParamList),
				 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 idx = 0; idx < size; idx++)
	{
		CParseHandlerNLJIndexParam *nest_param_parse_handler =
			dynamic_cast<CParseHandlerNLJIndexParam *>((*this)[idx]);

		CDXLColRef *nest_param_colref_dxl =
			nest_param_parse_handler->GetNestParamColRefDxl();
		nest_param_colref_dxl->AddRef();
		m_nest_params_colrefs_array->Append(nest_param_colref_dxl);
	}

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

// EOF

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