greenplumn CParseHandlerScalarOpList 代码
文件路径：/src/backend/gporca/libnaucrates/src/parser/CParseHandlerScalarOpList.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2014 VMware, Inc. or its affiliates.
/
/ @filename:
/ CParseHandlerScalarOpList.cpp
/
/ @doc:
/ Implementation of the SAX parse handler class for parsing scalar
/ operator lists
/ @owner:
/
/
/ @test:
/
/
/---------------------------------------------------------------------------
#include "naucrates/dxl/parser/CParseHandlerScalarOpList.h"
#include "naucrates/dxl/operators/CDXLOperatorFactory.h"
#include "naucrates/dxl/operators/CDXLScalarOpList.h"
#include "naucrates/dxl/parser/CParseHandlerFactory.h"
#include "naucrates/dxl/parser/CParseHandlerScalarOp.h"
using namespace gpdxl;
XERCES_CPP_NAMESPACE_USE
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerScalarOpList::CParseHandlerScalarOpList
/
/ @doc:
/ Ctor
/
/---------------------------------------------------------------------------
CParseHandlerScalarOpList::CParseHandlerScalarOpList(
CMemoryPool *mp, CParseHandlerManager *parse_handler_mgr,
CParseHandlerBase *parse_handler_root)
: CParseHandlerScalarOp(mp, parse_handler_mgr, parse_handler_root),
m_dxl_op_list_type(CDXLScalarOpList::EdxloplistSentinel)
{
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerScalarOpList::StartElement
/
/ @doc:
/ Invoked by Xerces to process an opening tag
/
/---------------------------------------------------------------------------
void
CParseHandlerScalarOpList::StartElement(const XMLCh *const element_uri,
const XMLCh *const element_local_name,
const XMLCh *const element_qname,
const Attributes &attrs)
{
CDXLScalarOpList::EdxlOpListType dxl_op_list_type =
GetDXLOpListType(element_local_name);
if (nullptr == m_dxl_node &&
CDXLScalarOpList::EdxloplistSentinel > dxl_op_list_type)
{
/ create the list
m_dxl_op_list_type = dxl_op_list_type;
m_dxl_node = GPOS_NEW(m_mp) CDXLNode(
m_mp, GPOS_NEW(m_mp) CDXLScalarOpList(m_mp, m_dxl_op_list_type));
}
else
{
/ we must have already initialized the list node
GPOS_ASSERT(nullptr != m_dxl_node);
/ parse scalar child
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:
/ CParseHandlerScalarOpList::Edxloplisttype
/
/ @doc:
/ Return the op list type corresponding to the given operator name
/
/---------------------------------------------------------------------------
CDXLScalarOpList::EdxlOpListType
CParseHandlerScalarOpList::GetDXLOpListType(
const XMLCh *const element_local_name)
{
if (0 ==
XMLString::compareString(CDXLTokens::XmlstrToken(EdxltokenScalarOpList),
element_local_name))
{
return CDXLScalarOpList::EdxloplistGeneral;
}
if (0 == XMLString::compareString(
CDXLTokens::XmlstrToken(EdxltokenPartLevelEqFilterList),
element_local_name))
{
return CDXLScalarOpList::EdxloplistEqFilterList;
}
if (0 == XMLString::compareString(
CDXLTokens::XmlstrToken(EdxltokenPartLevelFilterList),
element_local_name))
{
return CDXLScalarOpList::EdxloplistFilterList;
}
return CDXLScalarOpList::EdxloplistSentinel;
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerScalarOpList::EndElement
/
/ @doc:
/ Invoked by Xerces to process a closing tag
/
/---------------------------------------------------------------------------
void
CParseHandlerScalarOpList::EndElement(const XMLCh *const, / element_uri,
const XMLCh *const element_local_name,
const XMLCh *const / element_qname
)
{
CDXLScalarOpList::EdxlOpListType dxl_op_list_type =
GetDXLOpListType(element_local_name);
if (m_dxl_op_list_type != dxl_op_list_type)
{
CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
str->GetBuffer());
}
/ add constructed children from child parse handlers
const ULONG arity = this->Length();
for (ULONG ul = 0; ul < arity; ul++)
{
CParseHandlerScalarOp *child_parse_handler =
dynamic_cast<CParseHandlerScalarOp *>((*this)[ul]);
AddChildFromParseHandler(child_parse_handler);
}
/ deactivate handler
m_parse_handler_mgr->DeactivateHandler();
}
/ EOF
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