nameidmapping.h

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/*
Minetest
Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
 
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
 
This program 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 Lesser General Public License for more details.
 
You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
 
#pragma once
 
#include <string>
#include <iostream>
#include <set>
#include <unordered_map>
#include "irrlichttypes_bloated.h"
 
typedef std::unordered_map<u16, std::string> IdToNameMap;
typedef std::unordered_map<std::string, u16> NameToIdMap;
 
class NameIdMapping
{
public:
    void serialize(std::ostream &os) const;
    void deSerialize(std::istream &is);
 
    void clear()
    {
        m_id_to_name.clear();
        m_name_to_id.clear();
    }
 
    void set(u16 id, const std::string &name)
    {
        m_id_to_name[id] = name;
        m_name_to_id[name] = id;
    }
 
    void removeId(u16 id)
    {
        std::string name;
        bool found = getName(id, name);
        if (!found)
            return;
        m_id_to_name.erase(id);
        m_name_to_id.erase(name);
    }
 
    void eraseName(const std::string &name)
    {
        u16 id;
        bool found = getId(name, id);
        if (!found)
            return;
        m_id_to_name.erase(id);
        m_name_to_id.erase(name);
    }
    bool getName(u16 id, std::string &result) const
    {
        IdToNameMap::const_iterator i;
        i = m_id_to_name.find(id);
        if (i == m_id_to_name.end())
            return false;
        result = i->second;
        return true;
    }
    bool getId(const std::string &name, u16 &result) const
    {
        NameToIdMap::const_iterator i;
        i = m_name_to_id.find(name);
        if (i == m_name_to_id.end())
            return false;
        result = i->second;
        return true;
    }
    u16 size() const { return m_id_to_name.size(); }
 
private:
    IdToNameMap m_id_to_name;
    NameToIdMap m_name_to_id;
};