greenplumn CParseHandlerLogicalConstTable 代码
文件路径：/src/backend/gporca/libnaucrates/src/parser/CParseHandlerLogicalConstTable.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2011 EMC Corp.
/
/ @filename:
/ CParseHandlerLogicalConstTable.cpp
/
/ @doc:
/ Implementation of the SAX parse handler class for parsing logical
/ const tables.
/---------------------------------------------------------------------------
#include "naucrates/dxl/parser/CParseHandlerLogicalConstTable.h"
#include "naucrates/dxl/operators/CDXLLogicalConstTable.h"
#include "naucrates/dxl/operators/CDXLOperatorFactory.h"
#include "naucrates/dxl/parser/CParseHandlerColDescr.h"
#include "naucrates/dxl/parser/CParseHandlerFactory.h"
using namespace gpdxl;
XERCES_CPP_NAMESPACE_USE
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerLogicalConstTable::CParseHandlerLogicalConstTable
/
/ @doc:
/ Ctor
/
/---------------------------------------------------------------------------
CParseHandlerLogicalConstTable::CParseHandlerLogicalConstTable(
CMemoryPool *mp, CParseHandlerManager *parse_handler_mgr,
CParseHandlerBase *parse_handler_root)
: CParseHandlerLogicalOp(mp, parse_handler_mgr, parse_handler_root),
m_const_tuples_datum_array(nullptr),
m_dxl_datum_array(nullptr)
{
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerLogicalConstTable::StartElement
/
/ @doc:
/ Invoked by Xerces to process an opening tag
/
/---------------------------------------------------------------------------
void
CParseHandlerLogicalConstTable::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(EdxltokenLogicalConstTable),
element_local_name))
{
/ start of a const table operator node
GPOS_ASSERT(0 == this->Length());
GPOS_ASSERT(nullptr == m_const_tuples_datum_array);
/ initialize the array of const tuples (datum arrays)
m_const_tuples_datum_array = GPOS_NEW(m_mp) CDXLDatum2dArray(m_mp);
/ install a parse handler for the columns
CParseHandlerBase *col_desc_parse_handler =
CParseHandlerFactory::GetParseHandler(
m_mp, CDXLTokens::XmlstrToken(EdxltokenColumns),
m_parse_handler_mgr, this);
m_parse_handler_mgr->ActivateParseHandler(col_desc_parse_handler);
/ store parse handler
this->Append(col_desc_parse_handler);
}
else if (0 == XMLString::compareString(
CDXLTokens::XmlstrToken(EdxltokenConstTuple),
element_local_name))
{
GPOS_ASSERT(
nullptr !=
m_const_tuples_datum_array); / we must have already seen a logical const table
GPOS_ASSERT(nullptr == m_dxl_datum_array);
/ initialize the array of datums (const tuple)
m_dxl_datum_array = GPOS_NEW(m_mp) CDXLDatumArray(m_mp);
}
else if (0 ==
XMLString::compareString(CDXLTokens::XmlstrToken(EdxltokenDatum),
element_local_name))
{
/ we must have already seen a logical const table and a const tuple
GPOS_ASSERT(nullptr != m_const_tuples_datum_array);
GPOS_ASSERT(nullptr != m_dxl_datum_array);
/ translate the datum and add it to the datum array
CDXLDatum *dxl_datum = CDXLOperatorFactory::GetDatumVal(
m_parse_handler_mgr->GetDXLMemoryManager(), attrs,
EdxltokenScalarConstValue);
m_dxl_datum_array->Append(dxl_datum);
}
else
{
CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
str->GetBuffer());
}
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerLogicalConstTable::EndElement
/
/ @doc:
/ Invoked by Xerces to process a closing tag
/
/---------------------------------------------------------------------------
void
CParseHandlerLogicalConstTable::EndElement(
const XMLCh *const, / element_uri,
const XMLCh *const element_local_name,
const XMLCh *const / element_qname
)
{
if (0 == XMLString::compareString(
CDXLTokens::XmlstrToken(EdxltokenLogicalConstTable),
element_local_name))
{
GPOS_ASSERT(1 == this->Length());
CParseHandlerColDescr *col_descr_parse_handler =
dynamic_cast<CParseHandlerColDescr *>((*this)[0]);
GPOS_ASSERT(nullptr !=
col_descr_parse_handler->GetDXLColumnDescrArray());
CDXLColDescrArray *dxl_col_descr_array =
col_descr_parse_handler->GetDXLColumnDescrArray();
dxl_col_descr_array->AddRef();
CDXLLogicalConstTable *lg_const_table_get_dxl_op =
GPOS_NEW(m_mp) CDXLLogicalConstTable(m_mp, dxl_col_descr_array,
m_const_tuples_datum_array);
m_dxl_node = GPOS_NEW(m_mp) CDXLNode(m_mp, lg_const_table_get_dxl_op);
#ifdef GPOS_DEBUG
lg_const_table_get_dxl_op->AssertValid(m_dxl_node,
false /* validate_children */);
#endif / GPOS_DEBUG
/ deactivate handler
m_parse_handler_mgr->DeactivateHandler();
}
else if (0 == XMLString::compareString(
CDXLTokens::XmlstrToken(EdxltokenConstTuple),
element_local_name))
{
GPOS_ASSERT(nullptr != m_dxl_datum_array);
m_const_tuples_datum_array->Append(m_dxl_datum_array);
m_dxl_datum_array =
nullptr; / intialize for the parsing the next const tuple (if needed)
}
else if (0 !=
XMLString::compareString(CDXLTokens::XmlstrToken(EdxltokenDatum),
element_local_name))
{
CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
str->GetBuffer());
}
}
/ EOF
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