greenplumn CParseHandlerSortColList 源码
greenplumn CParseHandlerSortColList 代码
文件路径:/src/backend/gporca/libnaucrates/src/parser/CParseHandlerSortColList.cpp
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2010 Greenplum, Inc.
//
// @filename:
// CParseHandlerSortColList.cpp
//
// @doc:
// Implementation of the SAX parse handler class for parsing sorting column lists.
//---------------------------------------------------------------------------
#include "naucrates/dxl/parser/CParseHandlerSortColList.h"
#include "naucrates/dxl/operators/CDXLOperatorFactory.h"
#include "naucrates/dxl/operators/CDXLScalarSortColList.h"
#include "naucrates/dxl/parser/CParseHandlerFactory.h"
#include "naucrates/dxl/parser/CParseHandlerScalarOp.h"
#include "naucrates/dxl/parser/CParseHandlerSortCol.h"
using namespace gpdxl;
XERCES_CPP_NAMESPACE_USE
//---------------------------------------------------------------------------
// @function:
// CParseHandlerSortColList::CParseHandlerSortColList
//
// @doc:
// Constructor
//
//---------------------------------------------------------------------------
CParseHandlerSortColList::CParseHandlerSortColList(
CMemoryPool *mp, CParseHandlerManager *parse_handler_mgr,
CParseHandlerBase *parse_handler_root)
: CParseHandlerScalarOp(mp, parse_handler_mgr, parse_handler_root)
{
}
//---------------------------------------------------------------------------
// @function:
// CParseHandlerSortColList::StartElement
//
// @doc:
// Invoked by Xerces to process an opening tag
//
//---------------------------------------------------------------------------
void
CParseHandlerSortColList::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(EdxltokenScalarSortColList),
element_local_name))
{
// start the sorting column list
m_dxl_node = GPOS_NEW(m_mp)
CDXLNode(m_mp, GPOS_NEW(m_mp) CDXLScalarSortColList(m_mp));
}
else if (0 == XMLString::compareString(
CDXLTokens::XmlstrToken(EdxltokenScalarSortCol),
element_local_name))
{
// we must have seen a sorting col list already and initialized the sort col list node
GPOS_ASSERT(nullptr != m_dxl_node);
// start new sort column
CParseHandlerBase *sort_col_parse_handler =
CParseHandlerFactory::GetParseHandler(
m_mp, CDXLTokens::XmlstrToken(EdxltokenScalarSortCol),
m_parse_handler_mgr, this);
m_parse_handler_mgr->ActivateParseHandler(sort_col_parse_handler);
// store parse handler
this->Append(sort_col_parse_handler);
sort_col_parse_handler->startElement(element_uri, element_local_name,
element_qname, attrs);
}
else
{
CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
str->GetBuffer());
}
}
//---------------------------------------------------------------------------
// @function:
// CParseHandlerSortColList::EndElement
//
// @doc:
// Invoked by Xerces to process a closing tag
//
//---------------------------------------------------------------------------
void
CParseHandlerSortColList::EndElement(const XMLCh *const, // element_uri,
const XMLCh *const element_local_name,
const XMLCh *const // element_qname
)
{
if (0 != XMLString::compareString(
CDXLTokens::XmlstrToken(EdxltokenScalarSortColList),
element_local_name))
{
CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
str->GetBuffer());
}
const ULONG length = this->Length();
// add sorting columns from child parse handlers
for (ULONG ul = 0; ul < length; ul++)
{
CParseHandlerSortCol *sort_col_parse_handler =
dynamic_cast<CParseHandlerSortCol *>((*this)[ul]);
AddChildFromParseHandler(sort_col_parse_handler);
}
#ifdef GPOS_DEBUG
m_dxl_node->GetOperator()->AssertValid(m_dxl_node,
false /* validate_children */);
#endif // GPOS_DEBUG
// deactivate handler
m_parse_handler_mgr->DeactivateHandler();
}
// EOF
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