greenplumn CParseHandlerLogicalTVF 代码
文件路径：/src/backend/gporca/libnaucrates/src/parser/CParseHandlerLogicalTVF.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2012 EMC Corp.
/
/ @filename:
/ CParseHandlerLogicalTVF.cpp
/
/ @doc:
/
/ Implementation of the SAX parse handler class for parsing table-valued
/ functions
/---------------------------------------------------------------------------
#include "naucrates/dxl/parser/CParseHandlerLogicalTVF.h"
#include "naucrates/dxl/CDXLUtils.h"
#include "naucrates/dxl/operators/CDXLLogicalTVF.h"
#include "naucrates/dxl/operators/CDXLOperatorFactory.h"
#include "naucrates/dxl/parser/CParseHandlerColDescr.h"
#include "naucrates/dxl/parser/CParseHandlerFactory.h"
#include "naucrates/dxl/parser/CParseHandlerLogicalOp.h"
#include "naucrates/dxl/parser/CParseHandlerScalarOp.h"
using namespace gpdxl;
XERCES_CPP_NAMESPACE_USE
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerLogicalTVF::CParseHandlerLogicalTVF
/
/ @doc:
/ Ctor
/
/---------------------------------------------------------------------------
CParseHandlerLogicalTVF::CParseHandlerLogicalTVF(
CMemoryPool *mp, CParseHandlerManager *parse_handler_mgr,
CParseHandlerBase *parse_handler_root)
: CParseHandlerLogicalOp(mp, parse_handler_mgr, parse_handler_root),
m_func_mdid(nullptr),
m_return_type_mdid(nullptr),
m_mdname(nullptr)
{
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerLogicalTVF::StartElement
/
/ @doc:
/ Processes a Xerces start element event
/
/---------------------------------------------------------------------------
void
CParseHandlerLogicalTVF::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(EdxltokenLogicalTVF),
element_local_name))
{
/ parse function id
m_func_mdid = CDXLOperatorFactory::ExtractConvertAttrValueToMdId(
m_parse_handler_mgr->GetDXLMemoryManager(), attrs, EdxltokenFuncId,
EdxltokenLogicalTVF);
/ parse function name
const XMLCh *func_name = CDXLOperatorFactory::ExtractAttrValue(
attrs, EdxltokenName, EdxltokenLogicalTVF);
CWStringDynamic *func_name_str =
CDXLUtils::CreateDynamicStringFromXMLChArray(
m_parse_handler_mgr->GetDXLMemoryManager(), func_name);
m_mdname = GPOS_NEW(m_mp) CMDName(m_mp, func_name_str);
GPOS_DELETE(func_name_str);
/ parse function return type
m_return_type_mdid = CDXLOperatorFactory::ExtractConvertAttrValueToMdId(
m_parse_handler_mgr->GetDXLMemoryManager(), attrs, EdxltokenTypeId,
EdxltokenLogicalTVF);
}
else if (0 ==
XMLString::compareString(CDXLTokens::XmlstrToken(EdxltokenColumns),
element_local_name))
{
/ parse handler for columns
CParseHandlerBase *cold_descr_parse_handler =
CParseHandlerFactory::GetParseHandler(
m_mp, CDXLTokens::XmlstrToken(EdxltokenColumns),
m_parse_handler_mgr, this);
m_parse_handler_mgr->ActivateParseHandler(cold_descr_parse_handler);
/ store parse handlers
this->Append(cold_descr_parse_handler);
cold_descr_parse_handler->startElement(element_uri, element_local_name,
element_qname, attrs);
}
else
{
/ 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 handlers
this->Append(child_parse_handler);
child_parse_handler->startElement(element_uri, element_local_name,
element_qname, attrs);
}
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerLogicalTVF::EndElement
/
/ @doc:
/ Processes a Xerces end element event
/
/---------------------------------------------------------------------------
void
CParseHandlerLogicalTVF::EndElement(const XMLCh *const, / element_uri,
const XMLCh *const element_local_name,
const XMLCh *const / element_qname
)
{
if (0 !=
XMLString::compareString(CDXLTokens::XmlstrToken(EdxltokenLogicalTVF),
element_local_name))
{
CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
str->GetBuffer());
}
CParseHandlerColDescr *col_descr_parse_handler =
dynamic_cast<CParseHandlerColDescr *>((*this)[0]);
GPOS_ASSERT(nullptr != col_descr_parse_handler);
/ get column descriptors
CDXLColDescrArray *cold_descr_dxl_array =
col_descr_parse_handler->GetDXLColumnDescrArray();
GPOS_ASSERT(nullptr != cold_descr_dxl_array);
cold_descr_dxl_array->AddRef();
CDXLLogicalTVF *lg_tvf_op = GPOS_NEW(m_mp) CDXLLogicalTVF(
m_mp, m_func_mdid, m_return_type_mdid, m_mdname, cold_descr_dxl_array);
m_dxl_node = GPOS_NEW(m_mp) CDXLNode(m_mp, lg_tvf_op);
const ULONG length = this->Length();
/ loop over arglist children and add them to this parsehandler
for (ULONG idx = 1; idx < length; idx++)
{
CParseHandlerScalarOp *child_parse_handler =
dynamic_cast<CParseHandlerScalarOp *>((*this)[idx]);
AddChildFromParseHandler(child_parse_handler);
}
/ deactivate handler
m_parse_handler_mgr->DeactivateHandler();
}
/ EOF
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