greenplumn CSystemId 源码
greenplumn CSystemId 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/md/CSystemId.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// CSystemId.h
//
// @doc:
// Class for representing the system id of a metadata provider
//---------------------------------------------------------------------------
#ifndef GPMD_CSystemId_H
#define GPMD_CSystemId_H
#include "gpos/base.h"
#include "naucrates/md/IMDId.h"
#define GPDXL_SYSID_LENGTH 10
namespace gpmd
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CSystemId
//
// @doc:
// Class for representing the system id of a metadata provider
//
//---------------------------------------------------------------------------
class CSystemId
{
private:
// system id type
IMDId::EMDIdType m_mdid_type;
// system id
WCHAR m_sysid_char[GPDXL_SYSID_LENGTH + 1];
public:
// ctor
CSystemId(IMDId::EMDIdType mdid_type, const WCHAR *sysid_char,
ULONG length = GPDXL_SYSID_LENGTH);
// copy ctor
CSystemId(const CSystemId &);
// type of system id
IMDId::EMDIdType
MdidType() const
{
return m_mdid_type;
}
// system id string
const WCHAR *
GetBuffer() const
{
return m_sysid_char;
}
// equality
BOOL Equals(const CSystemId &sysid) const;
// hash function
ULONG HashValue() const;
};
// dynamic arrays over md system id elements
using CSystemIdArray = CDynamicPtrArray<CSystemId, CleanupDelete>;
} // namespace gpmd
#endif // !GPMD_CSystemId_H
// EOF
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