Component.hpp

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/*
SagaEngine library
Copyright (c) 2002-2006 Skalden Studio AS

This software is provided 'as-is', without any express or implied 
warranty. In no event will the authors be held liable for any 
damages arising from the use of this software.

Permission is granted to distribute the library under the terms of the 
Q Public License version 1.0. Be sure to read and understand the license
before using the library. It should be included here, or you may read it
at http://www.trolltech.com/products/qt/licenses/licensing/qpl

The original version of this library can be located at:
http://www.sagaengine.com/

Rune Myrland
rune@skalden.com
*/


#ifndef Component_hpp
#define Component_hpp

#include "comp.hpp"
#include "Composite.hpp"
#include "util/error/Log.hpp"
#include "util/type/String.hpp"

namespace se_core {
    class _SeCoreExport Component {
    public:
        Component(int type, Composite* owner, const ComponentFactory* factory = 0);

        virtual const char* name() const;

        virtual ~Component();


        inline Composite* owner() {
            return owner_;
        }


        inline const Composite* owner() const {
            return owner_;
        }


        inline Component* component(int type) {
            return owner_->component(type);
        }

        inline const Component* component(int type) const {
            return owner_->component(type);
        }


        int type() const {
            return type_;
        }


        const ComponentFactory* factory() {
            return factory_;
        }

        bool isActive();
        bool isDead() const;

    protected:
        friend class Composite;

        virtual void setActive(bool state) {}

        virtual void setDead() {}

        virtual void parentChanged(Composite* newParent, Composite* oldParent) {}

        virtual void zoneChanged(int type, Composite* newArea, Composite* oldArea);

        virtual void init();
        virtual void cleanup();

        int type_;
        Composite* owner_;

        const ComponentFactory* factory_;

    protected:
        template <class T, int type> class ComponentPtr {
        public:
            enum { TYPE = type };

            ComponentPtr(T* c) {
                component_ = c;
            }
            ComponentPtr(T& c) {
                component_ = &c;
            }
            ComponentPtr(Component& c) {
                component_ = static_cast<T*>(c.component(TYPE));
            }
            ComponentPtr(Component* c) {
                if(c)
                    component_ = static_cast<T*>(c->component(TYPE));
                else
                    component_ = 0;
            }
            ComponentPtr(Composite* c) {
                if(c)
                    component_ = static_cast<T*>(c->component(TYPE));
                else
                    component_ = 0;
            }
            ComponentPtr(Composite& c) {
                component_ = static_cast<T*>(c.component(TYPE));
            }

            ComponentPtr(const Component& c) {
                component_ = (T*)(c.owner()->component(TYPE));
            }
            ComponentPtr(const Composite& c) {
                component_ = (T*)(c.component(TYPE));
            }
            ComponentPtr(const Component* c) {
                if(c)
                    component_ = (T*)(c->owner()->component(TYPE));
                else
                    component_ = 0;
            }
            ComponentPtr(const Composite* c) {
                if(c)
                    component_ = (T*)(c->component(TYPE));
                else
                    component_ = 0;
            }

            inline T* operator->() {
                Assert(component_);
                return component_;
            }

            inline T& operator*() {
                Assert(component_);
                return *component_;
            }

            inline const T* operator->() const {
                Assert(component_);
                return component_;
            }

            inline const T& operator*() const {
                Assert(component_);
                return *component_;
            }

            ComponentPtr& operator=(T& c) {
                component_ = &c;
                return *this;
            }

            ComponentPtr& operator=(T* c) {
                component_ = c;
                return *this;
            }

            ComponentPtr& operator=(Component* c) {
                if(c)
                    component_ = static_cast<T*>(c->owner()->component(TYPE));
                else
                    component_ = 0;
                return *this;
            }

            ComponentPtr& operator=(Component& c) {
                component_ = static_cast<T*>(c.owner()->component(TYPE));
                return *this;
            }

            ComponentPtr& operator=(Composite* c) {
                if(c)
                    component_ = static_cast<T*>(c->component(TYPE));
                else
                    component_ = 0;
                return *this;
            }

            ComponentPtr& operator=(Composite& c) {
                component_ = static_cast<T*>(c.component(TYPE));
                return *this;
            }

            operator T*() {
                return component_;
            }

            operator const T*() const {
                return component_;
            }

            bool isNull() const {
                return component_ == 0;
            }

            bool operator==(const T* c) const {
                return component_ == c;
            }

        private:
            T* component_;
        };
    };

}

#endif

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