greenplumn CParseHandlerScalarCoerceViaIO 源码

greenplumn CParseHandlerScalarCoerceViaIO 代码

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

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2014 VMware, Inc. or its affiliates.
//
//	@filename:
//		CParseHandlerScalarCoerceViaIO.cpp
//
//	@doc:
//
//		Implementation of the SAX parse handler class for parsing scalar coerce operator.
//
//	@owner:
//
//	@test:
//
//
//---------------------------------------------------------------------------

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

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


using namespace gpdxl;


XERCES_CPP_NAMESPACE_USE

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerScalarCoerceViaIO::CParseHandlerScalarCoerceViaIO
//
//	@doc:
//		Ctor
//
//---------------------------------------------------------------------------
CParseHandlerScalarCoerceViaIO::CParseHandlerScalarCoerceViaIO(
	CMemoryPool *mp, CParseHandlerManager *parse_handler_mgr,
	CParseHandlerBase *parse_handler_root)
	: CParseHandlerScalarOp(mp, parse_handler_mgr, parse_handler_root)
{
}

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerScalarCoerceViaIO::StartElement
//
//	@doc:
//		Processes a Xerces start element event
//
//---------------------------------------------------------------------------
void
CParseHandlerScalarCoerceViaIO::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(EdxltokenScalarCoerceViaIO),
				 element_local_name))
	{
		if (nullptr != m_dxl_node)
		{
			CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
				m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
			GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
					   str->GetBuffer());
		}

		// parse and create scalar coerce
		CDXLScalarCoerceViaIO *dxl_op =
			(CDXLScalarCoerceViaIO *) CDXLOperatorFactory::MakeDXLCoerceViaIO(
				m_parse_handler_mgr->GetDXLMemoryManager(), attrs);

		m_dxl_node = GPOS_NEW(m_mp) CDXLNode(m_mp, dxl_op);

		// parse handler for child scalar node
		CParseHandlerBase *child_parse_handler =
			CParseHandlerFactory::GetParseHandler(
				m_mp, CDXLTokens::XmlstrToken(EdxltokenScalar),
				m_parse_handler_mgr, this);
		m_parse_handler_mgr->ActivateParseHandler(child_parse_handler);

		// store parse handler
		this->Append(child_parse_handler);
	}
	else
	{
		CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
			m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
		GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
				   str->GetBuffer());
	}
}

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerScalarCoerceViaIO::EndElement
//
//	@doc:
//		Processes a Xerces end element event
//
//---------------------------------------------------------------------------
void
CParseHandlerScalarCoerceViaIO::EndElement(
	const XMLCh *const,	 // element_uri,
	const XMLCh *const element_local_name,
	const XMLCh *const	// element_qname
)
{
	if (0 != XMLString::compareString(
				 CDXLTokens::XmlstrToken(EdxltokenScalarCoerceViaIO),
				 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(1 == this->Length());

	// add constructed child from child parse handlers
	CParseHandlerScalarOp *child_parse_handler =
		dynamic_cast<CParseHandlerScalarOp *>((*this)[0]);
	AddChildFromParseHandler(child_parse_handler);

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

// EOF

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