PolymorphicPointerReflector.h

Go to the documentation of this file.

/*
 * Copyright (C) 2012 by
 *   MetraLabs GmbH (MLAB), GERMANY
 * and
 *   Neuroinformatics and Cognitive Robotics Labs (NICR) at TU Ilmenau, GERMANY
 * All rights reserved.
 *
 * Contact: info@mira-project.org
 *
 * Commercial Usage:
 *   Licensees holding valid commercial licenses may use this file in
 *   accordance with the commercial license agreement provided with the
 *   software or, alternatively, in accordance with the terms contained in
 *   a written agreement between you and MLAB or NICR.
 *
 * GNU General Public License Usage:
 *   Alternatively, this file may be used under the terms of the GNU
 *   General Public License version 3.0 as published by the Free Software
 *   Foundation and appearing in the file LICENSE.GPL3 included in the
 *   packaging of this file. Please review the following information to
 *   ensure the GNU General Public License version 3.0 requirements will be
 *   met: http://www.gnu.org/copyleft/gpl.html.
 *   Alternatively you may (at your option) use any later version of the GNU
 *   General Public License if such license has been publicly approved by
 *   MLAB and NICR (or its successors, if any).
 *
 * IN NO EVENT SHALL "MLAB" OR "NICR" BE LIABLE TO ANY PARTY FOR DIRECT,
 * INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF
 * THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF "MLAB" OR
 * "NICR" HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * "MLAB" AND "NICR" SPECIFICALLY DISCLAIM ANY WARRANTIES, INCLUDING,
 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
 * ON AN "AS IS" BASIS, AND "MLAB" AND "NICR" HAVE NO OBLIGATION TO
 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS OR MODIFICATIONS.
 */

#ifndef _MIRA_POLYMORPHICPOINTERREFLECTOR_H_
#define _MIRA_POLYMORPHICPOINTERREFLECTOR_H_

#include <map>
#include <memory>

#include <utils/Foreach.h>
#include <serialization/VoidCast.h>

namespace mira {


MIRA_DEFINE_EXCEPTION(XPolymorphicPointerReflectorNotRegistered, XIO)

namespace serialization {


template <typename Derived>
struct PolymorphicPointerReflectorBase
{
    virtual ~PolymorphicPointerReflectorBase() {}

    virtual void invoke(Derived& serializer, void* pointer) = 0;
};

template <typename T, typename Derived>
struct PolymorphicPointerReflector :
            public PolymorphicPointerReflectorBase<Derived>
{
    virtual void invoke(Derived& reflector, void* pointer)
    {
        // and serialize content recursively
        reflector.invokePointerObject(*serialization::void_downcast<T>(pointer));
    }
};

template <typename Derived>
class PolymorphicPointerReflectorRegistrar :
            public LazySingleton<PolymorphicPointerReflectorRegistrar<Derived> >
{
public:

    typedef PolymorphicPointerReflectorBase<Derived>& ReflectorRef;

    typedef std::unique_ptr<PolymorphicPointerReflectorBase<Derived>> ReflectorPtr;

public:

    ~PolymorphicPointerReflectorRegistrar() { }

public:

    template<typename Class>
    void registerClass()
    {
        int typeId = Class::CLASS().getTypeId();
        if(mReflectors.count(typeId)!=0)
            return; // we already have registered that class type

        // add a new pointer serializer
        mReflectors.insert(std::make_pair(typeId,
                                          std::make_unique<PolymorphicPointerReflector<Class, Derived>>()));
    }

    template<typename Class>
    void unregisterClass()
    {
        int typeId = Class::CLASS().getTypeId();

        auto it = mReflectors.find(typeId);
        if(it==mReflectors.end())
            return; // we have not registered that class type,
                    // or already unregistered it

        // remove it from our map (will automatically delete the managed object)
        mReflectors.erase(it);
    }

    ReflectorRef getPolymorphicPointerReflector(int typeId)
    {
        auto it = mReflectors.find(typeId);
        if(it==mReflectors.end())
            MIRA_THROW(XPolymorphicPointerReflectorNotRegistered,
                       "Type ID " << typeId << " not registered");

        return *it->second;
    }

private:

    typedef std::map<int, ReflectorPtr> ReflectorMap;

    ReflectorMap mReflectors;

};


} // namespace


} // namespace

#endif