greenplumn CParseHandlerLogicalProject 源码

  • 2022-08-18
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greenplumn CParseHandlerLogicalProject 代码

文件路径:/src/backend/gporca/libnaucrates/include/naucrates/dxl/parser/CParseHandlerLogicalProject.h

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2011 Greenplum, Inc.
//
//	@filename:
//		CParseHandlerLogicalProject.h
//
//	@doc:
//		Parse handler for parsing a logical project operator
//
//---------------------------------------------------------------------------
#ifndef GPDXL_CParseHandlerLogicalProject_H
#define GPDXL_CParseHandlerLogicalProject_H

#include "gpos/base.h"

#include "naucrates/dxl/operators/CDXLLogicalProject.h"
#include "naucrates/dxl/parser/CParseHandlerLogicalOp.h"


namespace gpdxl
{
using namespace gpos;

XERCES_CPP_NAMESPACE_USE

//---------------------------------------------------------------------------
//	@class:
//		CParseHandlerLogicalProject
//
//	@doc:
//		Parse handler for parsing a logical project operator
//
//---------------------------------------------------------------------------
class CParseHandlerLogicalProject : public CParseHandlerLogicalOp
{
private:
	// 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:
	CParseHandlerLogicalProject(const CParseHandlerLogicalProject &) = delete;

	// ctor/dtor
	CParseHandlerLogicalProject(CMemoryPool *mp,
								CParseHandlerManager *parse_handler_mgr,
								CParseHandlerBase *parse_handler_root);

	~CParseHandlerLogicalProject() override;
};
}  // namespace gpdxl

#endif	// !GPDXL_CParseHandlerLogicalProject_H

// EOF

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