greenplumn CParseHandlerWindowFrame 源码
greenplumn CParseHandlerWindowFrame 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/parser/CParseHandlerWindowFrame.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// CParseHandlerWindowFrame.h
//
// @doc:
// SAX parse handler class for parsing the window frame in a window key
//---------------------------------------------------------------------------
#ifndef GPDXL_CParseHandlerWindowFrame_H
#define GPDXL_CParseHandlerWindowFrame_H
#include "gpos/base.h"
#include "naucrates/dxl/operators/CDXLWindowFrame.h"
#include "naucrates/dxl/parser/CParseHandlerBase.h"
#include "naucrates/dxl/xml/dxltokens.h"
namespace gpdxl
{
using namespace gpos;
XERCES_CPP_NAMESPACE_USE
//---------------------------------------------------------------------------
// @class:
// CParseHandlerWindowFrame
//
// @doc:
// SAX parse handler class for parsing the window frame in a
// window key.
//
//---------------------------------------------------------------------------
class CParseHandlerWindowFrame : public CParseHandlerBase
{
private:
// window frame specification
EdxlFrameSpec m_dxl_win_frame_spec;
// frame exclusion strategy
EdxlFrameExclusionStrategy m_dxl_frame_exclusion_strategy;
// window frame generated by the parse handler
CDXLWindowFrame *m_window_frame;
// process the start of an element
void StartElement(
const XMLCh *const element_uri, // URI of element's namespace
const XMLCh *const element_local_name, // local part of element's name
const XMLCh *const element_qname, // element's qname
const Attributes &attr // element's attributes
) override;
// process the end of an element
void EndElement(
const XMLCh *const element_uri, // URI of element's namespace
const XMLCh *const element_local_name, // local part of element's name
const XMLCh *const element_qname // element's qname
) override;
public:
CParseHandlerWindowFrame(const CParseHandlerWindowFrame &) = delete;
// ctor
CParseHandlerWindowFrame(CMemoryPool *mp,
CParseHandlerManager *parse_handler_mgr,
CParseHandlerBase *parse_handler_root);
// window frame generated by the parse handler
CDXLWindowFrame *
GetWindowFrame()
{
return m_window_frame;
}
};
} // namespace gpdxl
#endif // !GPDXL_CParseHandlerWindowFrame_H
// EOF
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