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/*  -*-c++-*-
 *  Copyright (C) 2009 Cedric Pinson <cedric.pinson@plopbyte.net>
 *
 * This library is open source and may be redistributed and/or modified under
 * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
 * (at your option) any later version.  The full license is in LICENSE file
 * included with this distribution, and on the openscenegraph.org website.
 *
 * This library 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
 * OpenSceneGraph Public License for more details.
*/

#ifndef OSGANIMATION_ANIMATION_UPDATE_CALLBACK
#define OSGANIMATION_ANIMATION_UPDATE_CALLBACK 1

#include <osg/Object>
#include <osgAnimation/Channel>
#include <osgAnimation/Animation>
#include <string>

namespace osgAnimation
{

    class AnimationUpdateCallbackBase : public virtual osg::Object
    {
    public:
        virtual bool link(Channel* channel) = 0;
        virtual int link(Animation* animation) = 0;
    };


    template <class T>
    class AnimationUpdateCallback : public AnimationUpdateCallbackBase, public T
    {
    public:
        AnimationUpdateCallback() {}
        AnimationUpdateCallback(const std::string& name) { T::setName(name);}
        AnimationUpdateCallback(const AnimationUpdateCallback& apc,const osg::CopyOp& copyop): T(apc, copyop) {}

        META_Object(osgAnimation, AnimationUpdateCallback<T>);

        const std::string& getName() const { return T::getName(); }
        bool link(Channel* /*channel*/) { return 0; }
        int link(Animation* animation)
        {
            if (T::getName().empty())
            {
                osg::notify(osg::WARN) << "An update callback has no name, it means it could link only with \"\" named Target, often an error, discard" << std::endl;
                return 0;
            }
            int nbLinks = 0;
            for (ChannelList::iterator it = animation->getChannels().begin();
                 it != animation->getChannels().end();
                 ++it)
            {
                std::string targetName = (*it)->getTargetName();
                if (targetName == T::getName())
                {
                    AnimationUpdateCallbackBase* a = this;
                    a->link((*it).get());
                    nbLinks++;
                }
            }
            return nbLinks;
        }
    };

}

#endif