InstanceId.h

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/******************************************************************************
*
* Copyright Saab AB, 2008-2013 (http://safir.sourceforge.net)
*
* Created by: Lars Hagström / stlrha
*
*******************************************************************************
*
* This file is part of Safir SDK Core.
*
* Safir SDK Core is free software: you can redistribute it and/or modify
* it under the terms of version 3 of the GNU General Public License as
* published by the Free Software Foundation.
*
* Safir SDK Core is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Safir SDK Core.  If not, see <http://www.gnu.org/licenses/>.
*
******************************************************************************/

#ifndef __DOTS_INSTANCE_ID_H__
#define __DOTS_INSTANCE_ID_H__

#include <Safir/Dob/Typesystem/Defs.h>
#include <Safir/Dob/Typesystem/Utilities.h>
#include <Safir/Dob/Typesystem/Exceptions.h>
#include <Safir/Dob/Typesystem/Internal/InternalOperations.h>
#include <string>
#include <sstream>

namespace Safir
{
namespace Dob
{
namespace Typesystem
{
    class InstanceId
    {
    public:
        static InstanceId GenerateRandom() {return InstanceId(Internal::GenerateRandom64Bit());}

        InstanceId(): m_instanceId(-1) {}

        InstanceId(const std::wstring& id) :
            m_instanceId(Internal::Generate64BitHash(id)),
            m_instanceIdStr(id)
        {}

        explicit InstanceId(const Dob::Typesystem::Int64 id):
            m_instanceId(id) {}


        InstanceId(const Int64 id, const std::wstring & idStr):
            m_instanceId(id),
            m_instanceIdStr(idStr)
        {
#ifndef NDEBUG
            if (!m_instanceIdStr.empty() && m_instanceId != Internal::Generate64BitHash(idStr))
            {
                std::wostringstream ostr;
                ostr << "InstanceId two-argument constructor got an inconsistent id. Got ("
                    << id << ", '" << idStr << "'), but the string evaluates to " << Internal::Generate64BitHash(idStr) << ".";
                throw SoftwareViolationException(ostr.str(),__WFILE__,__LINE__);
            }
#endif
        }

        void RemoveString() {m_instanceIdStr.clear(); m_CachedUtf8String.clear();}

        bool operator ==(const InstanceId& other) const
        {
            return m_instanceId == other.m_instanceId;
        }

        bool operator !=(const InstanceId & other) const
        {
            return !(*this==other);
        }

        bool operator < (const InstanceId & other) const
        {
            return m_instanceId < other.m_instanceId;
        }

        DOTS_CPP_API const std::wstring ToString() const;


        typedef Int64 UnderlyingType;

        UnderlyingType GetRawValue() const {return m_instanceId;}

        const std::wstring & GetRawString() const {return m_instanceIdStr;}

        Int32 Utf8StringLength() const
        {
            if (m_instanceIdStr.empty())
            {
                return 0;
            }

            if (m_CachedUtf8String.empty())
            {
                m_CachedUtf8String = Utilities::ToUtf8(m_instanceIdStr);
            }

            return static_cast<Int32>(m_CachedUtf8String.length() + 1);
        }

        const std::string & Utf8String() const
        {
            if (!m_instanceIdStr.empty() && m_CachedUtf8String.empty())
            {
                m_CachedUtf8String = Utilities::ToUtf8(m_instanceIdStr);
            }
            return m_CachedUtf8String;
        }

    private:
        UnderlyingType m_instanceId;
        std::wstring   m_instanceIdStr;

        mutable std::string m_CachedUtf8String;
    };

    static inline std::wostream & operator << (std::wostream& out, const InstanceId& instanceId)
    {return out << instanceId.ToString();}
}
}
}
#endif