greenplumn CParseHandlerLogicalGet 代码
文件路径：/src/backend/gporca/libnaucrates/src/parser/CParseHandlerLogicalGet.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2011 Greenplum, Inc.
/
/ @filename:
/ CParseHandlerLogicalGet.cpp
/
/ @doc:
/ Implementation of the SAX parse handler class for parsing logical get operators.
/---------------------------------------------------------------------------
#include "naucrates/dxl/parser/CParseHandlerLogicalGet.h"
#include "naucrates/dxl/operators/CDXLLogicalExternalGet.h"
#include "naucrates/dxl/operators/CDXLOperatorFactory.h"
#include "naucrates/dxl/parser/CParseHandlerFactory.h"
#include "naucrates/dxl/parser/CParseHandlerScalarOp.h"
#include "naucrates/dxl/parser/CParseHandlerTableDescr.h"
using namespace gpdxl;
XERCES_CPP_NAMESPACE_USE
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerLogicalGet::CParseHandlerLogicalGet
/
/ @doc:
/ Constructor
/
/---------------------------------------------------------------------------
CParseHandlerLogicalGet::CParseHandlerLogicalGet(
CMemoryPool *mp, CParseHandlerManager *parse_handler_mgr,
CParseHandlerBase *parse_handler_root)
: CParseHandlerLogicalOp(mp, parse_handler_mgr, parse_handler_root)
{
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerLogicalGet::StartElement
/
/ @doc:
/ Start element helper function
/
/---------------------------------------------------------------------------
void
CParseHandlerLogicalGet::StartElement(const XMLCh *const element_local_name,
Edxltoken token_type)
{
if (0 != XMLString::compareString(CDXLTokens::XmlstrToken(token_type),
element_local_name))
{
CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
str->GetBuffer());
}
/ create child node parsers
/ parse handler for table descriptor
CParseHandlerBase *table_descr_parse_handler =
CParseHandlerFactory::GetParseHandler(
m_mp, CDXLTokens::XmlstrToken(EdxltokenTableDescr),
m_parse_handler_mgr, this);
m_parse_handler_mgr->ActivateParseHandler(table_descr_parse_handler);
/ store child parse handlers in array
this->Append(table_descr_parse_handler);
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerLogicalGet::StartElement
/
/ @doc:
/ Invoked by Xerces to process an opening tag
/
/---------------------------------------------------------------------------
void
CParseHandlerLogicalGet::StartElement(const XMLCh *const, / element_uri,
const XMLCh *const element_local_name,
const XMLCh *const, / element_qname
const Attributes & /attrs
)
{
StartElement(element_local_name, EdxltokenLogicalGet);
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerLogicalGet::EndElement
/
/ @doc:
/ End element helper function
/
/---------------------------------------------------------------------------
void
CParseHandlerLogicalGet::EndElement(const XMLCh *const element_local_name,
Edxltoken token_type)
{
if (0 != XMLString::compareString(CDXLTokens::XmlstrToken(token_type),
element_local_name))
{
CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
str->GetBuffer());
}
CParseHandlerTableDescr *table_descr_parse_handler =
dynamic_cast<CParseHandlerTableDescr *>((*this)[0]);
GPOS_ASSERT(nullptr != table_descr_parse_handler->GetDXLTableDescr());
CDXLTableDescr *table_descr = table_descr_parse_handler->GetDXLTableDescr();
table_descr->AddRef();
if (EdxltokenLogicalGet == token_type)
{
m_dxl_node = GPOS_NEW(m_mp)
CDXLNode(m_mp, GPOS_NEW(m_mp) CDXLLogicalGet(m_mp, table_descr));
}
else
{
GPOS_ASSERT(EdxltokenLogicalExternalGet == token_type);
m_dxl_node = GPOS_NEW(m_mp) CDXLNode(
m_mp, GPOS_NEW(m_mp) CDXLLogicalExternalGet(m_mp, table_descr));
}
#ifdef GPOS_DEBUG
m_dxl_node->GetOperator()->AssertValid(m_dxl_node,
false /* validate_children */);
#endif / GPOS_DEBUG
/ deactivate handler
m_parse_handler_mgr->DeactivateHandler();
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerLogicalGet::EndElement
/
/ @doc:
/ Invoked by Xerces to process a closing tag
/
/---------------------------------------------------------------------------
void
CParseHandlerLogicalGet::EndElement(const XMLCh *const, / element_uri,
const XMLCh *const element_local_name,
const XMLCh *const / element_qname
)
{
EndElement(element_local_name, EdxltokenLogicalGet);
}
/ EOF
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