greenplumn CParseHandlerColDescr 源码

greenplumn CParseHandlerColDescr 代码

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

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2010 Greenplum, Inc.
//
//	@filename:
//		CParseHandlerColDescr.cpp
//
//	@doc:
//		Implementation of the SAX parse handler class for parsing the list of
//		column descriptors in a table descriptor node.
//---------------------------------------------------------------------------

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

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

using namespace gpdxl;


XERCES_CPP_NAMESPACE_USE

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerColDescr::CParseHandlerColDescr
//
//	@doc:
//		Ctor
//
//---------------------------------------------------------------------------
CParseHandlerColDescr::CParseHandlerColDescr(
	CMemoryPool *mp, CParseHandlerManager *parse_handler_mgr,
	CParseHandlerBase *parse_handler_base)
	: CParseHandlerBase(mp, parse_handler_mgr, parse_handler_base),
	  m_current_column_descr(nullptr)
{
	m_dxl_column_descr_array = GPOS_NEW(mp) CDXLColDescrArray(mp);
}

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerColDescr::~CParseHandlerColDescr
//
//	@doc:
//		Dtor
//
//---------------------------------------------------------------------------

CParseHandlerColDescr::~CParseHandlerColDescr()
{
	CRefCount::SafeRelease(m_dxl_column_descr_array);
}

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerColDescr::GetDXLColumnDescrArray
//
//	@doc:
//		Returns the array of column descriptors.
//
//---------------------------------------------------------------------------
CDXLColDescrArray *
CParseHandlerColDescr::GetDXLColumnDescrArray()
{
	return m_dxl_column_descr_array;
}

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerColDescr::StartElement
//
//	@doc:
//		Invoked by Xerces to process an opening tag
//
//---------------------------------------------------------------------------
void
CParseHandlerColDescr::StartElement(const XMLCh *const,	 // element_uri,
									const XMLCh *const element_local_name,
									const XMLCh *const,	 // element_qname
									const Attributes &attrs)
{
	if (0 == XMLString::compareString(
				 element_local_name, CDXLTokens::XmlstrToken(EdxltokenColumns)))
	{
		// start of the columns block
		GPOS_ASSERT(nullptr == m_current_column_descr);
	}
	else if (0 ==
			 XMLString::compareString(element_local_name,
									  CDXLTokens::XmlstrToken(EdxltokenColumn)))
	{
		// start of a new column descriptor
		m_current_column_descr = CDXLOperatorFactory::MakeColumnDescr(
			m_parse_handler_mgr->GetDXLMemoryManager(), attrs);
	}
	else
	{
		CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
			m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
		GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
				   str->GetBuffer());
	}
}

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerColDescr::EndElement
//
//	@doc:
//		Invoked by Xerces to process a closing tag
//
//---------------------------------------------------------------------------
void
CParseHandlerColDescr::EndElement(const XMLCh *const,  // element_uri,
								  const XMLCh *const element_local_name,
								  const XMLCh *const  // element_qname
)
{
	if (0 == XMLString::compareString(
				 element_local_name, CDXLTokens::XmlstrToken(EdxltokenColumns)))
	{
		// finish the columns block
		GPOS_ASSERT(nullptr != m_dxl_column_descr_array);
		m_parse_handler_mgr->DeactivateHandler();
	}
	else if (0 ==
			 XMLString::compareString(element_local_name,
									  CDXLTokens::XmlstrToken(EdxltokenColumn)))
	{
		// finish up a column descriptor
		GPOS_ASSERT(nullptr != m_current_column_descr);
		GPOS_ASSERT(nullptr != m_dxl_column_descr_array);
		m_dxl_column_descr_array->Append(m_current_column_descr);
		// reset column descr
		m_current_column_descr = nullptr;
	}
	else
	{
		CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
			m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
		GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
				   str->GetBuffer());
	}
}

// EOF

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