greenplumn CParseHandlerWindowKey 代码
文件路径：/src/backend/gporca/libnaucrates/src/parser/CParseHandlerWindowKey.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2012 EMC Corp.
/
/ @filename:
/ CParseHandlerWindowKey.cpp
/
/ @doc:
/ Implementation of the SAX parse handler class for parsing the window key
/---------------------------------------------------------------------------
#include "naucrates/dxl/parser/CParseHandlerWindowKey.h"
#include "naucrates/dxl/operators/CDXLOperatorFactory.h"
#include "naucrates/dxl/parser/CParseHandlerFactory.h"
#include "naucrates/dxl/parser/CParseHandlerScalarOp.h"
#include "naucrates/dxl/parser/CParseHandlerSortColList.h"
#include "naucrates/dxl/parser/CParseHandlerWindowFrame.h"
using namespace gpdxl;
XERCES_CPP_NAMESPACE_USE
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerWindowKey::CParseHandlerWindowKey
/
/ @doc:
/ Ctor
/
/---------------------------------------------------------------------------
CParseHandlerWindowKey::CParseHandlerWindowKey(
CMemoryPool *mp, CParseHandlerManager *parse_handler_mgr,
CParseHandlerBase *parse_handler_root)
: CParseHandlerBase(mp, parse_handler_mgr, parse_handler_root),
m_dxl_window_key_gen(nullptr)
{
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerWindowKey::StartElement
/
/ @doc:
/ Invoked by Xerces to process an opening tag
/
/---------------------------------------------------------------------------
void
CParseHandlerWindowKey::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(EdxltokenWindowKey),
element_local_name))
{
GPOS_ASSERT(nullptr == m_dxl_window_key_gen);
m_dxl_window_key_gen = GPOS_NEW(m_mp) CDXLWindowKey();
/ parse handler for the sorting column list
CParseHandlerBase *sort_col_list_parse_handler =
CParseHandlerFactory::GetParseHandler(
m_mp, CDXLTokens::XmlstrToken(EdxltokenScalarSortColList),
m_parse_handler_mgr, this);
m_parse_handler_mgr->ActivateParseHandler(sort_col_list_parse_handler);
/ store parse handler
this->Append(sort_col_list_parse_handler);
}
else if (0 == XMLString::compareString(
CDXLTokens::XmlstrToken(EdxltokenWindowFrame),
element_local_name))
{
GPOS_ASSERT(1 == this->Length());
/ parse handler for the leading and trailing scalar values
CParseHandlerBase *window_frame_parse_handler_base =
CParseHandlerFactory::GetParseHandler(
m_mp, CDXLTokens::XmlstrToken(EdxltokenWindowFrame),
m_parse_handler_mgr, this);
m_parse_handler_mgr->ActivateParseHandler(
window_frame_parse_handler_base);
/ store parse handler
this->Append(window_frame_parse_handler_base);
window_frame_parse_handler_base->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:
/ CParseHandlerWindowKey::EndElement
/
/ @doc:
/ Invoked by Xerces to process a closing tag
/
/---------------------------------------------------------------------------
void
CParseHandlerWindowKey::EndElement(const XMLCh *const, / element_uri,
const XMLCh *const element_local_name,
const XMLCh *const / element_qname
)
{
if (0 !=
XMLString::compareString(CDXLTokens::XmlstrToken(EdxltokenWindowKey),
element_local_name))
{
CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
str->GetBuffer());
}
GPOS_ASSERT(nullptr != m_dxl_window_key_gen);
GPOS_ASSERT(1 <= this->Length());
CParseHandlerSortColList *sort_col_list_parse_handler =
dynamic_cast<CParseHandlerSortColList *>((*this)[0]);
CDXLNode *sort_col_list_dxlnode =
sort_col_list_parse_handler->CreateDXLNode();
sort_col_list_dxlnode->AddRef();
m_dxl_window_key_gen->SetSortColList(sort_col_list_dxlnode);
if (2 == this->Length())
{
CParseHandlerWindowFrame *window_frame_parse_handler_base =
dynamic_cast<CParseHandlerWindowFrame *>((*this)[1]);
CDXLWindowFrame *window_frame =
window_frame_parse_handler_base->GetWindowFrame();
m_dxl_window_key_gen->SetWindowFrame(window_frame);
}
/ deactivate handler
m_parse_handler_mgr->DeactivateHandler();
}
/ EOF
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