text: //---------------------------------------------------------------------------
  //	Greenplum Database
  //	Copyright (C) 2011 Greenplum, Inc.
  //
  //	@filename:
  //		CParseHandlerScalarBooleanTest.cpp
  //
  //	@doc:
  //		
  //		Implementation of the SAX parse handler class for parsing scalar BooleanTest.
  //---------------------------------------------------------------------------
  
  #include "naucrates/dxl/parser/CParseHandlerScalarOp.h"
  #include "naucrates/dxl/parser/CParseHandlerFactory.h"
  #include "naucrates/dxl/CDXLUtils.h"
  #include "naucrates/dxl/operators/CDXLOperatorFactory.h"
  #include "naucrates/dxl/parser/CParseHandlerScalarBooleanTest.h"
  
  
  using namespace gpdxl;
  
  
  XERCES_CPP_NAMESPACE_USE
  
  //---------------------------------------------------------------------------
  //	@function:
  //		CParseHandlerScalarBooleanTest::CParseHandlerScalarBooleanTest
  //
  //	@doc:
  //		Constructor
  //
  //---------------------------------------------------------------------------
  CParseHandlerScalarBooleanTest::CParseHandlerScalarBooleanTest
  	(
  	IMemoryPool *mp,
  	CParseHandlerManager *parse_handler_mgr,
  	CParseHandlerBase *parse_handler_root
  	)
  	:
  	CParseHandlerScalarOp(mp, parse_handler_mgr, parse_handler_root),
  	m_dxl_boolean_test_type(EdxlbooleantestSentinel)
  {
  }
  
  //---------------------------------------------------------------------------
  //	@function:
  //		CParseHandlerScalarBooleanTest::StartElement
  //
  //	@doc:
  //		Processes a Xerces start element event
  //
  //---------------------------------------------------------------------------
  void
  CParseHandlerScalarBooleanTest::StartElement
  	(
  	const XMLCh* const element_uri,
  	const XMLCh* const element_local_name,
  	const XMLCh* const element_qname,
  	const Attributes& attrs
  	)
  {
  	EdxlBooleanTestType dxl_boolean_test_type =
  			CParseHandlerScalarBooleanTest::GetDxlBooleanTestType(element_local_name);
  
  	if (EdxlbooleantestSentinel == dxl_boolean_test_type)
  	{
  		if(NULL == m_dxl_node)
  		{
  			GPOS_RAISE
  				(
  				gpdxl::ExmaDXL,
  				gpdxl::ExmiDXLUnexpectedTag,
  				CDXLUtils::CreateDynamicStringFromXMLChArray(m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name)->GetBuffer()
  				);
  		}
  		else
  		{
  			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 handlers
  			this->Append(child_parse_handler);
  
  			child_parse_handler->startElement(element_uri, element_local_name, element_qname, attrs);
  		}
  
  		return;
  	}
  
  	m_dxl_boolean_test_type = dxl_boolean_test_type;
  	// parse and create scalar BooleanTest
  	CDXLScalarBooleanTest *dxl_op =
  			(CDXLScalarBooleanTest*) CDXLOperatorFactory::MakeDXLBooleanTest(m_parse_handler_mgr->GetDXLMemoryManager(), m_dxl_boolean_test_type);
  
  	// construct node from the created child nodes
  	m_dxl_node = GPOS_NEW(m_mp) CDXLNode(m_mp, dxl_op);
  }
  
  //---------------------------------------------------------------------------
  //	@function:
  //		CParseHandlerScalarBooleanTest::EndElement
  //
  //	@doc:
  //		Processes a Xerces end element event
  //
  //---------------------------------------------------------------------------
  void
  CParseHandlerScalarBooleanTest::EndElement
  (
  		const XMLCh* const, // element_uri,
  		const XMLCh* const element_local_name,
  		const XMLCh* const // element_qname
  )
  {
  
  	EdxlBooleanTestType dxl_boolean_test_type = CParseHandlerScalarBooleanTest::GetDxlBooleanTestType(element_local_name);
  
  	if (EdxlbooleantestSentinel == dxl_boolean_test_type )
  	{
  		GPOS_RAISE
  			(
  			gpdxl::ExmaDXL,
  			gpdxl::ExmiDXLUnexpectedTag,
  			CDXLUtils::CreateDynamicStringFromXMLChArray(m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name)->GetBuffer()
  			);
  	}
  	
  	GPOS_ASSERT(dxl_boolean_test_type == m_dxl_boolean_test_type);
  	GPOS_ASSERT(1 == this->Length());
  
  	CParseHandlerScalarOp *pph = dynamic_cast<CParseHandlerScalarOp*>((*this)[0]);
  	AddChildFromParseHandler(pph);
  
  	// deactivate handler
  	m_parse_handler_mgr->DeactivateHandler();
  }
  
  //---------------------------------------------------------------------------
  //	@function:
  //		CParseHandlerScalarBooleanTest::GetDxlBooleanTestType
  //
  //	@doc:
  //		Parse the boolean test type from the attribute value
  //
  //---------------------------------------------------------------------------
  EdxlBooleanTestType
  CParseHandlerScalarBooleanTest::GetDxlBooleanTestType
  	(
  	const XMLCh *xmlszBooleanTestType
  	)
  {
  	if (0 == XMLString::compareString(CDXLTokens::XmlstrToken(EdxltokenScalarBoolTestIsTrue), xmlszBooleanTestType))
  	{
  		return EdxlbooleantestIsTrue;
  	}
  
  	if (0 == XMLString::compareString(CDXLTokens::XmlstrToken(EdxltokenScalarBoolTestIsNotTrue), xmlszBooleanTestType))
  	{
  		return EdxlbooleantestIsNotTrue;
  	}
  
  	if (0 == XMLString::compareString(CDXLTokens::XmlstrToken(EdxltokenScalarBoolTestIsFalse), xmlszBooleanTestType))
  	{
  		return EdxlbooleantestIsFalse;
  	}
  
  	if (0 == XMLString::compareString(CDXLTokens::XmlstrToken(EdxltokenScalarBoolTestIsNotFalse), xmlszBooleanTestType))
  	{
  		return EdxlbooleantestIsNotFalse;
  	}
  
  	if (0 == XMLString::compareString(CDXLTokens::XmlstrToken(EdxltokenScalarBoolTestIsUnknown), xmlszBooleanTestType))
  	{
  		return EdxlbooleantestIsUnknown;
  	}
  
  	if (0 == XMLString::compareString(CDXLTokens::XmlstrToken(EdxltokenScalarBoolTestIsNotUnknown), xmlszBooleanTestType))
  	{
  		return EdxlbooleantestIsNotUnknown;
  	}
  
  	return EdxlbooleantestSentinel;
  }
  
  // EOF
  