greenplumn CParseHandlerScalarExpr 源码
greenplumn CParseHandlerScalarExpr 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/parser/CParseHandlerScalarExpr.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2014 VMware, Inc. or its affiliates.
//
// @filename:
// CParseHandlerScalarExpr.h
//
// @doc:
// SAX parse handler class for parsing top level scalar expressions.
//---------------------------------------------------------------------------
#ifndef GPDXL_CParseHandlerScalarExpr_H
#define GPDXL_CParseHandlerScalarExpr_H
#include "naucrates/dxl/parser/CParseHandlerScalarOp.h"
namespace gpdxl
{
using namespace gpos;
XERCES_CPP_NAMESPACE_USE
//---------------------------------------------------------------------------
// @class:
// CParseHandlerScalarExpr
//
// @doc:
// Parse handler for parsing a top level scalar expression.
//
//---------------------------------------------------------------------------
class CParseHandlerScalarExpr : public CParseHandlerBase
{
private:
// the root of the parsed DXL tree constructed by the parse handler
CDXLNode *m_dxl_node;
protected:
// returns the parse handler type
EDxlParseHandlerType GetParseHandlerType() const override;
// process notification of the beginning 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 notification of 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:
CParseHandlerScalarExpr(const CParseHandlerScalarExpr &) = delete;
// ctor
CParseHandlerScalarExpr(CMemoryPool *mp,
CParseHandlerManager *parse_handler_mgr,
CParseHandlerBase *parse_handler_root);
// dtor
~CParseHandlerScalarExpr() override;
// root of constructed DXL expression
CDXLNode *CreateDXLNode() const;
};
} // namespace gpdxl
#endif // !GPDXL_CParseHandlerScalarExpr_H
// EOF
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