greenplumn CParseHandlerProjElem 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/parser/CParseHandlerProjElem.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2010 Greenplum, Inc.
/
/ @filename:
/ CParseHandlerProjElem.h
/
/ @doc:
/ SAX parse handler class for parsing projection elements.
/---------------------------------------------------------------------------
#ifndef GPDXL_CParseHandlerProjElem_H
#define GPDXL_CParseHandlerProjElem_H
#include "gpos/base.h"
#include "naucrates/dxl/operators/CDXLScalarProjElem.h"
#include "naucrates/dxl/parser/CParseHandlerScalarOp.h"
namespace gpdxl
{
using namespace gpos;
XERCES_CPP_NAMESPACE_USE
/---------------------------------------------------------------------------
/ @class:
/ CParseHandlerProjElem
/
/ @doc:
/ Parse handler for projection elements
/
/---------------------------------------------------------------------------
class CParseHandlerProjElem : public CParseHandlerScalarOp
{
private:
/ project elem operator
CDXLScalarProjElem *m_dxl_op;
/ 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:
CParseHandlerProjElem(const CParseHandlerProjElem &) = delete;
/ ctor/dtor
CParseHandlerProjElem(CMemoryPool *mp,
CParseHandlerManager *parse_handler_mgr,
CParseHandlerBase *parse_handler_root);
};
} / namespace gpdxl
#endif / !GPDXL_CParseHandlerProjElem_H
/ EOF
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