greenplumn CParseHandlerScalarSwitchCase 代码
文件路径：/src/backend/gporca/libnaucrates/src/parser/CParseHandlerScalarSwitchCase.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2012 EMC Corp.
/
/ @filename:
/ CParseHandlerScalarSwitchCase.cpp
/
/ @doc:
/
/ Implementation of the SAX parse handler class for a SwitchCase operator
/---------------------------------------------------------------------------
#include "naucrates/dxl/parser/CParseHandlerScalarSwitchCase.h"
#include "naucrates/dxl/CDXLUtils.h"
#include "naucrates/dxl/operators/CDXLOperatorFactory.h"
#include "naucrates/dxl/parser/CParseHandlerFactory.h"
using namespace gpdxl;
XERCES_CPP_NAMESPACE_USE
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerScalarSwitchCase::CParseHandlerScalarSwitchCase
/
/ @doc:
/ Ctor
/
/---------------------------------------------------------------------------
CParseHandlerScalarSwitchCase::CParseHandlerScalarSwitchCase(
CMemoryPool *mp, CParseHandlerManager *parse_handler_mgr,
CParseHandlerBase *parse_handler_root)
: CParseHandlerScalarOp(mp, parse_handler_mgr, parse_handler_root)
{
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerScalarSwitchCase::StartElement
/
/ @doc:
/ Processes a Xerces start element event
/
/---------------------------------------------------------------------------
void
CParseHandlerScalarSwitchCase::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(EdxltokenScalarSwitchCase),
element_local_name))
{
CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
str->GetBuffer());
}
/ create and activate the parse handler for the children nodes in reverse
/ order of their expected appearance
/ parse handler for result expression
CParseHandlerBase *parse_handler_result =
CParseHandlerFactory::GetParseHandler(
m_mp, CDXLTokens::XmlstrToken(EdxltokenScalar), m_parse_handler_mgr,
this);
m_parse_handler_mgr->ActivateParseHandler(parse_handler_result);
/ parse handler for condition expression
CParseHandlerBase *parse_handler_condition_expr =
CParseHandlerFactory::GetParseHandler(
m_mp, CDXLTokens::XmlstrToken(EdxltokenScalar), m_parse_handler_mgr,
this);
m_parse_handler_mgr->ActivateParseHandler(parse_handler_condition_expr);
/ store parse handlers
this->Append(parse_handler_condition_expr);
this->Append(parse_handler_result);
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerScalarSwitchCase::EndElement
/
/ @doc:
/ Invoked by Xerces to process a closing tag
/
/---------------------------------------------------------------------------
void
CParseHandlerScalarSwitchCase::EndElement(const XMLCh *const, / element_uri
const XMLCh *const element_local_name,
const XMLCh *const / element_qname
)
{
if (0 != XMLString::compareString(
CDXLTokens::XmlstrToken(EdxltokenScalarSwitchCase),
element_local_name))
{
CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
str->GetBuffer());
}
/ construct node
m_dxl_node = GPOS_NEW(m_mp)
CDXLNode(m_mp, GPOS_NEW(m_mp) CDXLScalarSwitchCase(m_mp));
CParseHandlerScalarOp *parse_handler_condition_expr =
dynamic_cast<CParseHandlerScalarOp *>((*this)[0]);
CParseHandlerScalarOp *parse_handler_result =
dynamic_cast<CParseHandlerScalarOp *>((*this)[1]);
/ add constructed children
AddChildFromParseHandler(parse_handler_condition_expr);
AddChildFromParseHandler(parse_handler_result);
/ deactivate handler
m_parse_handler_mgr->DeactivateHandler();
}
/EOF
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