greenplumn CParseHandlerScalarSwitchCase 源码
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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