greenplumn CSystemId 源码

2022-08-18
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greenplumn CSystemId 代码

文件路径：/src/backend/gporca/libnaucrates/src/md/CSystemId.cpp

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2012 EMC Corp.
//
//	@filename:
//		CSystemId.cpp
//
//	@doc:
//		Implementation of system identifiers
//---------------------------------------------------------------------------


#include "naucrates/md/CSystemId.h"

using namespace gpos;
using namespace gpmd;

//---------------------------------------------------------------------------
//	@function:
//		CSystemId::CSystemId
//
//	@doc:
//		Constructor
//
//---------------------------------------------------------------------------
CSystemId::CSystemId(IMDId::EMDIdType mdid_type, const WCHAR *sysid_char,
					 ULONG length)
	: m_mdid_type(mdid_type)
{
	GPOS_ASSERT(GPDXL_SYSID_LENGTH >= length);

	if (length > 0)
	{
		clib::WcStrNCpy(m_sysid_char, sysid_char, length);
	}

	// ensure string is terminated
	m_sysid_char[length] = WCHAR_EOS;
}

//---------------------------------------------------------------------------
//	@function:
//		CSystemId::CSystemId
//
//	@doc:
//		Copy constructor
//
//---------------------------------------------------------------------------
CSystemId::CSystemId(const CSystemId &sysid) : m_mdid_type(sysid.MdidType())
{
	clib::WcStrNCpy(m_sysid_char, sysid.GetBuffer(), GPDXL_SYSID_LENGTH);
}

//---------------------------------------------------------------------------
//	@function:
//		CSystemId::Equals
//
//	@doc:
//		Equality function
//
//---------------------------------------------------------------------------
BOOL
CSystemId::Equals(const CSystemId &sysid) const
{
	ULONG length = GPOS_WSZ_LENGTH(m_sysid_char);
	return length == GPOS_WSZ_LENGTH(sysid.m_sysid_char) &&
		   0 == clib::Wcsncmp(m_sysid_char, sysid.m_sysid_char, length);
}

//---------------------------------------------------------------------------
//	@function:
//		CSystemId::HashValue
//
//	@doc:
//		Hash function
//
//---------------------------------------------------------------------------
ULONG
CSystemId::HashValue() const
{
	return gpos::HashByteArray(
		(BYTE *) m_sysid_char,
		GPOS_WSZ_LENGTH(m_sysid_char) * GPOS_SIZEOF(WCHAR));
}

// EOF

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本文标签： greenplum
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