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Link.h

Go to the documentation of this file.

/* SimData: Data Infrastructure for Simulations
 * Copyright (C) 2002 Mark Rose <tm2@stm.lbl.gov>
 * 
 * This file is part of SimData.
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * 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 General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */


#ifndef __SIMDATA_LINK_H__
#define __SIMDATA_LINK_H__


#if defined(_MSC_VER) && (_MSC_VER <= 1300)
#pragma warning (disable : 4290)
#endif


#include <SimData/Export.h>
#include <SimData/Path.h>
#include <SimData/Object.h>

#include <string>
#include <cassert>



NAMESPACE_SIMDATA


class DataArchive;


class SIMDATA_EXPORT ReferencePointer {
public:

        // SWIG python specific comparisons
        bool __eq__(const ReferencePointer& other);
        bool __ne__(const ReferencePointer& other); 
        
        explicit ReferencePointer(): _reference(0) { }

        explicit ReferencePointer(Object* ptr): _reference(0) {
                _assign_safe(ptr);
        }

        explicit ReferencePointer(const ReferencePointer& r): _reference(0) {
                _assign_safe(r._reference);
        }

        virtual ~ReferencePointer() {
                _release();
        }

        inline bool unique() const {
                return (_reference ? _reference->_count()==1 : true);
        }

#ifndef SWIG

        inline ReferencePointer& operator=(const ReferencePointer& r) {
                _assign_safe(r._reference);
                return *this;
        }
#endif

#ifndef SWIG

        inline void *operator=(void *p) {
                assert(p==0);
                _reference = 0;
                return p;
        }
#endif

        inline void setNull() {
                _assign_fast(0);
        }


        inline bool isNull() const { 
                return _reference == 0; 
        }

#ifndef SWIG
        inline bool operator!() const {
                return _reference == 0;
        }
#endif

        inline bool valid() const {
                return _reference != 0;
        }
        
        inline bool operator==(ReferencePointer const &p) const {
                return _reference == p._reference;
        }

        virtual Object *__get__() { return _reference; }

protected:
        inline void _assign_safe(Object* ptr) {
                _release();
                _update(ptr);
                if (!isNull()) _reference->_ref();
        }

        inline void _assign_fast(Object *ptr) {
                _release();
                _reference = ptr;
                if (!isNull()) _reference->_ref();
        }

        inline void _release() {
                if (!isNull()) {
                        _reference->_deref();
                        _reference = 0;
                }
        }

        virtual void _update(Object* p) { _reference = p; }

        inline Object* _get() const { 
                return _reference; 
        }

        Object* _reference;
};


class SIMDATA_EXPORT LinkBase: public Path, public ReferencePointer {
        template <class T> friend class Ref;
public:

        // SWIG python specific comparisons
        bool __eq__(const LinkBase& other);
        bool __ne__(const LinkBase& other); 
        
        explicit LinkBase(): Path((const char*)0), ReferencePointer() { }

        LinkBase(const char* path): Path(path), ReferencePointer() { }

        explicit LinkBase(const Path& path, Object* ptr): 
                Path(path), ReferencePointer(ptr) { }
        
        explicit LinkBase(Object* ptr): Path(), ReferencePointer(ptr) {}

        virtual ~LinkBase() { }

        LinkBase(const LinkBase& r): Path(r.getPath()), ReferencePointer(r) {
        }

#ifndef SWIG

        LinkBase& operator=(const LinkBase& r) {
                ReferencePointer::operator=(r);
                _path = r.getPath();
                return *this;
        }
#endif


        virtual void serialize(Archive&);

        virtual std::string asString() const;

        virtual std::string typeString() const { return std::string("type::LinkBase"); }
        
        bool operator==(LinkBase const &p) const {
                return ReferencePointer::operator==(p);
        }

protected:
        void _load(DataArchive* archive, ObjectID path=0);

};


template<class T> class Link: public LinkBase {
public:

        typedef std::vector< Link<T> > vector;

        explicit Link(): LinkBase() {}
        
        explicit Link(const Path& path, T* ptr): LinkBase(path, ptr) {}
        
        explicit Link(const char* path): LinkBase(path) {}

        explicit Link(T* t): LinkBase() {
                *this = t;
        }

        Link(const Link<T>& p) { 
                _path = p.getPath();
                _assign_fast(p._reference);
        }
        
        Link(const LinkBase& p) { 
                LinkBase::operator=(p);
        }
        
        /*
        Link<T>& operator=(const LinkBase& p) {
                LinkBase::operator=(p);
        }
        */

        virtual std::string typeString() const { return std::string("type::Link::") + T::_getClassName(); }

#ifndef SWIG

        T *operator =(T *t) {
                _path = 0;
                _assign_fast(t);
                return t;
        }
#endif // SWIG

        T* operator->() { 
                return (T*) _reference;
        }
        
        const T* operator->() const { 
                return (T*) _reference;
        }
        
        T& operator*() {
                return *((T*) _reference);
        }
        
        const T& operator*() const {
                return *((T*) _reference);
        }

        const T* get() const {
                return (T*) _reference;
        }
        
        T* get() {
                return (T*) _reference;
        }
        
protected:
        virtual void _update(Object* ptr) throw(ObjectTypeMismatch) {
                LinkBase::_update(ptr);
                T* _special = dynamic_cast<T*>(ptr);
                if (ptr != 0 && _special == 0) 
                        throw ObjectTypeMismatch("dynamic_cast<> failed in Link<>::_update()");
        }
};



NAMESPACE_SIMDATA_END

#endif //__SIMDATA_LINK_H__

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SimData version pre-0.4.0. For more information on SimData, visit the SimData Homepage. Generated on Tue Oct 14 12:06:38 2003, using Doxygen 1.2.18.