greenplumn CMDIdCast 代码
文件路径：/src/backend/gporca/libnaucrates/src/md/CMDIdCast.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2013 EMC Corp.
/
/ @filename:
/ CMDIdCast.cpp
/
/ @doc:
/ Implementation of mdids for cast functions
/---------------------------------------------------------------------------
#include "naucrates/md/CMDIdCast.h"
#include "naucrates/dxl/xml/CXMLSerializer.h"
using namespace gpos;
using namespace gpmd;
/---------------------------------------------------------------------------
/ @function:
/ CMDIdCast::CMDIdCast
/
/ @doc:
/ Ctor
/
/---------------------------------------------------------------------------
CMDIdCast::CMDIdCast(CMDIdGPDB *mdid_src, CMDIdGPDB *mdid_dest)
: m_mdid_src(mdid_src),
m_mdid_dest(mdid_dest),
m_str(m_mdid_buffer, GPOS_ARRAY_SIZE(m_mdid_buffer))
{
GPOS_ASSERT(mdid_src->IsValid());
GPOS_ASSERT(mdid_dest->IsValid());
/ serialize mdid into static string
Serialize();
}
/---------------------------------------------------------------------------
/ @function:
/ CMDIdCast::~CMDIdCast
/
/ @doc:
/ Dtor
/
/---------------------------------------------------------------------------
CMDIdCast::~CMDIdCast()
{
m_mdid_src->Release();
m_mdid_dest->Release();
}
/---------------------------------------------------------------------------
/ @function:
/ CMDIdCast::Serialize
/
/ @doc:
/ Serialize mdid into static string
/
/---------------------------------------------------------------------------
void
CMDIdCast::Serialize()
{
/ serialize mdid as SystemType.mdidSrc.mdidDest
m_str.AppendFormat(GPOS_WSZ_LIT("%d.%d.%d.%d;%d.%d.%d"), MdidType(),
m_mdid_src->Oid(), m_mdid_src->VersionMajor(),
m_mdid_src->VersionMinor(), m_mdid_dest->Oid(),
m_mdid_dest->VersionMajor(),
m_mdid_dest->VersionMinor());
}
/---------------------------------------------------------------------------
/ @function:
/ CMDIdCast::GetBuffer
/
/ @doc:
/ Returns the string representation of the mdid
/
/---------------------------------------------------------------------------
const WCHAR *
CMDIdCast::GetBuffer() const
{
return m_str.GetBuffer();
}
/---------------------------------------------------------------------------
/ @function:
/ CMDIdCast::MdidSrc
/
/ @doc:
/ Returns the source type id
/
/---------------------------------------------------------------------------
IMDId *
CMDIdCast::MdidSrc() const
{
return m_mdid_src;
}
/---------------------------------------------------------------------------
/ @function:
/ CMDIdCast::MdidDest
/
/ @doc:
/ Returns the destination type id
/
/---------------------------------------------------------------------------
IMDId *
CMDIdCast::MdidDest() const
{
return m_mdid_dest;
}
/---------------------------------------------------------------------------
/ @function:
/ CMDIdCast::Equals
/
/ @doc:
/ Checks if the mdids are equal
/
/---------------------------------------------------------------------------
BOOL
CMDIdCast::Equals(const IMDId *mdid) const
{
if (nullptr == mdid || EmdidCastFunc != mdid->MdidType())
{
return false;
}
const CMDIdCast *mdid_cast_func = CMDIdCast::CastMdid(mdid);
return m_mdid_src->Equals(mdid_cast_func->MdidSrc()) &&
m_mdid_dest->Equals(mdid_cast_func->MdidDest());
}
/---------------------------------------------------------------------------
/ @function:
/ CMDIdCast::Serialize
/
/ @doc:
/ Serializes the mdid as the value of the given attribute
/
/---------------------------------------------------------------------------
void
CMDIdCast::Serialize(CXMLSerializer *xml_serializer,
const CWStringConst *pstrAttribute) const
{
xml_serializer->AddAttribute(pstrAttribute, &m_str);
}
/---------------------------------------------------------------------------
/ @function:
/ CMDIdCast::OsPrint
/
/ @doc:
/ Debug print of the id in the provided stream
/
/---------------------------------------------------------------------------
IOstream &
CMDIdCast::OsPrint(IOstream &os) const
{
os << "(" << m_str.GetBuffer() << ")";
return os;
}
/ EOF
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