greenplumn CParseHandlerIndexDescr 代码
文件路径：/src/backend/gporca/libnaucrates/src/parser/CParseHandlerIndexDescr.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2012 EMC Corp.
/
/ @filename:
/ CParseHandlerIndexDescr.cpp
/
/ @doc:
/ Implementation of the SAX parse handler class for parsing the index
/ descriptor portion of an index scan node
/
/ @owner:
/
/
/ @test:
/
/---------------------------------------------------------------------------
#include "naucrates/dxl/parser/CParseHandlerIndexDescr.h"
#include "naucrates/dxl/operators/CDXLOperatorFactory.h"
#include "naucrates/dxl/parser/CParseHandlerFactory.h"
#include "naucrates/dxl/parser/CParseHandlerManager.h"
using namespace gpdxl;
XERCES_CPP_NAMESPACE_USE
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerIndexDescr::CParseHandlerIndexDescr
/
/ @doc:
/ Ctor
/
/---------------------------------------------------------------------------
CParseHandlerIndexDescr::CParseHandlerIndexDescr(
CMemoryPool *mp, CParseHandlerManager *parse_handler_mgr,
CParseHandlerBase *parse_handler_root)
: CParseHandlerBase(mp, parse_handler_mgr, parse_handler_root),
m_dxl_index_descr(nullptr)
{
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerIndexDescr::~CParseHandlerIndexDescr
/
/ @doc:
/ Dtor
/
/---------------------------------------------------------------------------
CParseHandlerIndexDescr::~CParseHandlerIndexDescr()
{
CRefCount::SafeRelease(m_dxl_index_descr);
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerIndexDescr::MakeDXLIndexDescr
/
/ @doc:
/ Returns the index descriptor constructed by the parse handler
/
/---------------------------------------------------------------------------
CDXLIndexDescr *
CParseHandlerIndexDescr::GetDXLIndexDescr()
{
return m_dxl_index_descr;
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerIndexDescr::StartElement
/
/ @doc:
/ Invoked by Xerces to process an opening tag
/
/---------------------------------------------------------------------------
void
CParseHandlerIndexDescr::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(EdxltokenIndexDescr),
element_local_name))
{
CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
str->GetBuffer());
}
/ generate the index descriptor
m_dxl_index_descr = CDXLOperatorFactory::MakeDXLIndexDescr(
m_parse_handler_mgr->GetDXLMemoryManager(), attrs);
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerIndexDescr::EndElement
/
/ @doc:
/ Invoked by Xerces to process a closing tag
/
/---------------------------------------------------------------------------
void
CParseHandlerIndexDescr::EndElement(const XMLCh *const, / element_uri,
const XMLCh *const element_local_name,
const XMLCh *const / element_qname
)
{
if (0 !=
XMLString::compareString(CDXLTokens::XmlstrToken(EdxltokenIndexDescr),
element_local_name))
{
CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
str->GetBuffer());
}
GPOS_ASSERT(0 == this->Length());
/ deactivate handler
m_parse_handler_mgr->DeactivateHandler();
}
/ EOF
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