greenplumn CParseHandlerTableDescr 源码
greenplumn CParseHandlerTableDescr 代码
文件路径:/src/backend/gporca/libnaucrates/src/parser/CParseHandlerTableDescr.cpp
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2010 Greenplum, Inc.
//
// @filename:
// CParseHandlerTableDescr.cpp
//
// @doc:
// Implementation of the SAX parse handler class for parsing a table descriptor portion
// of a table scan node.
//---------------------------------------------------------------------------
#include "naucrates/dxl/parser/CParseHandlerTableDescr.h"
#include "naucrates/dxl/operators/CDXLOperatorFactory.h"
#include "naucrates/dxl/parser/CParseHandlerColDescr.h"
#include "naucrates/dxl/parser/CParseHandlerFactory.h"
#include "naucrates/dxl/parser/CParseHandlerManager.h"
using namespace gpdxl;
XERCES_CPP_NAMESPACE_USE
//---------------------------------------------------------------------------
// @function:
// CParseHandlerTableDescr::CParseHandlerTableDescr
//
// @doc:
// Constructor
//
//---------------------------------------------------------------------------
CParseHandlerTableDescr::CParseHandlerTableDescr(
CMemoryPool *mp, CParseHandlerManager *parse_handler_mgr,
CParseHandlerBase *parse_handler_root)
: CParseHandlerBase(mp, parse_handler_mgr, parse_handler_root),
m_dxl_table_descr(nullptr)
{
}
//---------------------------------------------------------------------------
// @function:
// CParseHandlerTableDescr::~CParseHandlerTableDescr
//
// @doc:
// Destructor
//
//---------------------------------------------------------------------------
CParseHandlerTableDescr::~CParseHandlerTableDescr()
{
CRefCount::SafeRelease(m_dxl_table_descr);
}
//---------------------------------------------------------------------------
// @function:
// CParseHandlerTableDescr::GetDXLTableDescr
//
// @doc:
// Returns the table descriptor constructed by the parse handler
//
//---------------------------------------------------------------------------
CDXLTableDescr *
CParseHandlerTableDescr::GetDXLTableDescr()
{
return m_dxl_table_descr;
}
//---------------------------------------------------------------------------
// @function:
// CParseHandlerTableDescr::StartElement
//
// @doc:
// Invoked by Xerces to process an opening tag
//
//---------------------------------------------------------------------------
void
CParseHandlerTableDescr::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(EdxltokenTableDescr),
element_local_name))
{
CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
str->GetBuffer());
}
// parse table name from attributes
m_dxl_table_descr = CDXLOperatorFactory::MakeDXLTableDescr(
m_parse_handler_mgr->GetDXLMemoryManager(), attrs);
// install column descriptor parsers
CParseHandlerBase *col_descr_parse_handler =
CParseHandlerFactory::GetParseHandler(
m_mp, CDXLTokens::XmlstrToken(EdxltokenColumns),
m_parse_handler_mgr, this);
m_parse_handler_mgr->ActivateParseHandler(col_descr_parse_handler);
// store parse handler
this->Append(col_descr_parse_handler);
}
//---------------------------------------------------------------------------
// @function:
// CParseHandlerTableDescr::EndElement
//
// @doc:
// Invoked by Xerces to process a closing tag
//
//---------------------------------------------------------------------------
void
CParseHandlerTableDescr::EndElement(const XMLCh *const, // element_uri,
const XMLCh *const element_local_name,
const XMLCh *const // element_qname
)
{
if (0 !=
XMLString::compareString(CDXLTokens::XmlstrToken(EdxltokenTableDescr),
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 from the created child nodes
GPOS_ASSERT(1 == this->Length());
// assemble the properties container from the cost
CParseHandlerColDescr *col_descr_parse_handler =
dynamic_cast<CParseHandlerColDescr *>((*this)[0]);
GPOS_ASSERT(nullptr != col_descr_parse_handler->GetDXLColumnDescrArray());
CDXLColDescrArray *dxl_column_descr_array =
col_descr_parse_handler->GetDXLColumnDescrArray();
dxl_column_descr_array->AddRef();
m_dxl_table_descr->SetColumnDescriptors(dxl_column_descr_array);
// deactivate handler
m_parse_handler_mgr->DeactivateHandler();
}
// EOF
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