Program Listing for File IfcBaseClass.h

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 * This file is part of IfcOpenShell.                                           *
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the                 *
 * Lesser GNU General Public License for more details.                          *
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#ifndef IFCBASECLASS_H
#define IFCBASECLASS_H

#include "ifc_parse_api.h"

#include "../ifcparse/IfcEntityInstanceData.h"
#include "../ifcparse/IfcSchema.h"
#include "../ifcparse/utils.h"

#include <boost/shared_ptr.hpp>

class Argument;
class IfcEntityList;

namespace IfcUtil {

    class IFC_PARSE_API IfcBaseClass {
    protected:
        IfcEntityInstanceData* data_;

        static bool is_null(const IfcBaseClass* not_this) {
            return !not_this;
        }

    public:
        IfcBaseClass() : data_(0) {}
        IfcBaseClass(IfcEntityInstanceData* d) : data_(d) {}
        virtual ~IfcBaseClass() { delete data_; }

        const IfcEntityInstanceData& data() const { return *data_; }
        IfcEntityInstanceData& data() { return *data_; }
        void data(IfcEntityInstanceData* d);

        virtual const IfcParse::declaration& declaration() const = 0;

        template <class T>
        T* as() {
            // @todo: do not allow this to be null in the first place
            if (is_null(this)) {
                return static_cast<T*>(0);
            }
            return declaration().is(T::Class())
                ? static_cast<T*>(this)
                : static_cast<T*>(0);
        }

        template <class T>
        const T* as() const {
            if (is_null(this)) {
                return static_cast<const T*>(0);
            }
            return declaration().is(T::Class())
                ? static_cast<const T*>(this)
                : static_cast<const T*>(0);
        }
    };

    class IFC_PARSE_API IfcLateBoundEntity : public IfcBaseClass {
    private:
        const IfcParse::declaration* decl_;

    public:
        IfcLateBoundEntity(const IfcParse::declaration* decl, IfcEntityInstanceData* data) : IfcBaseClass(data), decl_(decl) {}

        virtual const IfcParse::declaration& declaration() const {
            return *decl_;
        }
    };

    class IFC_PARSE_API IfcBaseEntity : public IfcBaseClass {
    public:
        IfcBaseEntity() : IfcBaseClass() {}
        IfcBaseEntity(IfcEntityInstanceData* d) : IfcBaseClass(d) {}

        virtual const IfcParse::entity& declaration() const = 0;

        Argument* get(const std::string& name) const;

        boost::shared_ptr<IfcEntityList> get_inverse(const std::string& a) const;
    };

    // TODO: Investigate whether these should be template classes instead
    class IFC_PARSE_API IfcBaseType : public IfcBaseClass {
    public:
        IfcBaseType() : IfcBaseClass() {}
        IfcBaseType(IfcEntityInstanceData* d) : IfcBaseClass(d) {}

        virtual const IfcParse::type_declaration& declaration() const = 0;
    };

}

#endif