greenplumn CParseHandlerMetadataColumns 源码
greenplumn CParseHandlerMetadataColumns 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/parser/CParseHandlerMetadataColumns.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 Greenplum, Inc.
//
// @filename:
// CParseHandlerMetadataColumns.h
//
// @doc:
// SAX parse handler class for columns metadata
//---------------------------------------------------------------------------
#ifndef GPDXL_CParseHandlerMetadataColumns_H
#define GPDXL_CParseHandlerMetadataColumns_H
#include "gpos/base.h"
#include "naucrates/dxl/parser/CParseHandlerBase.h"
#include "naucrates/md/CMDColumn.h"
#include "naucrates/md/CMDRelationGPDB.h"
namespace gpdxl
{
using namespace gpos;
using namespace gpmd;
XERCES_CPP_NAMESPACE_USE
//---------------------------------------------------------------------------
// @class:
// CParseHandlerMetadataColumns
//
// @doc:
// Parse handler for relation columns
//
//---------------------------------------------------------------------------
class CParseHandlerMetadataColumns : public CParseHandlerBase
{
private:
// list of columns
CMDColumnArray *m_md_col_array;
// 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:
CParseHandlerMetadataColumns(const CParseHandlerMetadataColumns &) = delete;
// ctor/dtor
CParseHandlerMetadataColumns(CMemoryPool *mp,
CParseHandlerManager *parse_handler_mgr,
CParseHandlerBase *parse_handler_root);
~CParseHandlerMetadataColumns() override;
// returns the constructed columns list
CMDColumnArray *GetMdColArray();
};
} // namespace gpdxl
#endif // !GPDXL_CParseHandlerMetadataColumns_H
// EOF
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