text: //---------------------------------------------------------------------------
  //	Greenplum Database
  //	Copyright (C) 2014 Pivotal Inc.
  //
  //	@filename:
  //		CParseHandlerScalarSubPlanTestExpr.cpp
  //
  //	@doc:
  //		Implementation of the SAX parse handler class for parsing subplan test expression
  //---------------------------------------------------------------------------
  
  
  #include "naucrates/dxl/parser/CParseHandlerScalarOp.h"
  #include "naucrates/dxl/parser/CParseHandlerFactory.h"
  
  #include "naucrates/dxl/operators/CDXLOperatorFactory.h"
  
  #include "naucrates/dxl/parser/CParseHandlerScalarSubPlanTestExpr.h"
  using namespace gpdxl;
  
  
  XERCES_CPP_NAMESPACE_USE
  
  //---------------------------------------------------------------------------
  //	@function:
  //		CParseHandlerScalarSubPlanTestExpr::CParseHandlerScalarSubPlanTestExpr
  //
  //	@doc:
  //		Ctor
  //
  //---------------------------------------------------------------------------
  CParseHandlerScalarSubPlanTestExpr::CParseHandlerScalarSubPlanTestExpr
  	(
  	CMemoryPool *mp,
  	CParseHandlerManager *parse_handler_mgr,
  	CParseHandlerBase *parse_handler_root
  	)
  	:
  	CParseHandlerScalarOp(mp, parse_handler_mgr, parse_handler_root),
  	m_dxl_test_expr(NULL)
  {}
  
  //---------------------------------------------------------------------------
  //	@function:
  //		CParseHandlerScalarSubPlanTestExpr::~CParseHandlerScalarSubPlanTestExpr
  //
  //	@doc:
  //		Dtor
  //
  //---------------------------------------------------------------------------
  CParseHandlerScalarSubPlanTestExpr::~CParseHandlerScalarSubPlanTestExpr()
  {
  	CRefCount::SafeRelease(m_dxl_test_expr);
  }
  
  //---------------------------------------------------------------------------
  //	@function:
  //		CParseHandlerScalarSubPlanTestExpr::StartElement
  //
  //	@doc:
  //		Processes a Xerces start element event
  //
  //---------------------------------------------------------------------------
  void
  CParseHandlerScalarSubPlanTestExpr::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(EdxltokenScalarSubPlanTestExpr), element_local_name))
  	{
  		// install a scalar element parser for parsing the test expression
  		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);
  
  		child_parse_handler->startElement(element_uri, element_local_name, element_qname, attrs);
  	}
  }
  
  //---------------------------------------------------------------------------
  //	@function:
  //		CParseHandlerScalarSubPlanTestExpr::EndElement
  //
  //	@doc:
  //		Processes a Xerces end element event
  //
  //---------------------------------------------------------------------------
  void
  CParseHandlerScalarSubPlanTestExpr::EndElement
  	(
  	const XMLCh* const, // element_uri,
  	const XMLCh* const element_local_name,
  	const XMLCh* const // element_qname
  	)
  {
  	if(0 != XMLString::compareString(CDXLTokens::XmlstrToken(EdxltokenScalarSubPlanTestExpr), element_local_name) && NULL != m_dxl_test_expr)
  	{
  		CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
  		GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag, str->GetBuffer());
  	}
  
  	if (0 < this->Length())
  	{
  		CParseHandlerScalarOp *child_parse_handler = dynamic_cast<CParseHandlerScalarOp *>((*this)[0]);
  		if (NULL != child_parse_handler->CreateDXLNode())
  		{
  			m_dxl_test_expr = child_parse_handler->CreateDXLNode();
  			m_dxl_test_expr->AddRef();
  		}
  	}
  
  	// deactivate handler
  	m_parse_handler_mgr->DeactivateHandler();
  }
  
  // EOF
  
  