greenplumn CParseHandlerXform 源码
greenplumn CParseHandlerXform 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/parser/CParseHandlerXform.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// CParseHandlerXform.h
//
// @doc:
// SAX parse handler class for parsing xform nodes.
//---------------------------------------------------------------------------
#ifndef GPDXL_CParseHandlerXform_H
#define GPDXL_CParseHandlerXform_H
#include "gpos/base.h"
#include "naucrates/dxl/parser/CParseHandlerBase.h"
// forward declarations
namespace gpopt
{
class CXform;
}
namespace gpdxl
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CParseHandlerXform
//
// @doc:
// Parse handler for parsing xform
//
//---------------------------------------------------------------------------
class CParseHandlerXform : public CParseHandlerBase
{
private:
// xform referred to by XML node
CXform *m_xform;
// 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:
CParseHandlerXform(const CParseHandlerXform &) = delete;
// ctor
CParseHandlerXform(CMemoryPool *mp, CParseHandlerManager *parse_handler_mgr,
CParseHandlerBase *parse_handler_root);
// dtor
~CParseHandlerXform() override;
// returns the root of constructed DXL plan
CXform *
GetXform()
{
return m_xform;
}
EDxlParseHandlerType
GetParseHandlerType() const override
{
return EdxlphSearchStrategy;
}
};
} // namespace gpdxl
#endif // !GPDXL_CParseHandlerXform_H
// EOF
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