BusinessObjectExtenderRef.hxx

Go to the documentation of this file.

// ==================================================
// Copyright 2014.
// Siemens Product Lifecycle Management Software Inc.
// All Rights Reserved.
// ==================================================

/*  */

#ifndef TCBUSINESSOBJECTEXTENDERREF_HXX
#define TCBUSINESSOBJECTEXTENDERREF_HXX

#include <unidefs.h>
#include <metaframework/BusinessObjectExtenderRegistry.hxx>
#include <metaframework/RootObject.hxx>

template <typename T> class BusinessObjectExtenderRef
{
public:

    BusinessObjectExtenderRef(): m_owning_obj_tag(0), m_pointee( 0 ) {}

    explicit BusinessObjectExtenderRef(
        tag_t owning_obj_tag               
        )
        : m_owning_obj_tag( owning_obj_tag ), m_pointee( 0 )
    {}

    explicit BusinessObjectExtenderRef(
        Teamcenter::RootObject owning_object               
        )
        : m_owning_obj_tag( 0 ), m_pointee( 0 )
    {
        m_owning_obj_tag = owning_object.getTag();
        m_pointee = getPointee();
    }

    template<typename S> explicit  BusinessObjectExtenderRef(const BusinessObjectExtenderRef<S> &other)
    {
        m_owning_obj_tag = other.m_owning_obj_tag;
        m_pointee = other.m_pointee ? dynamic_cast<T*>(other.m_pointee) : 0;
    }

    BusinessObjectExtenderRef& operator = (
        const BusinessObjectExtenderRef& other               
        )
    {

        if ( this != &other )
        {
            m_pointee = other.m_pointee;
            m_owning_obj_tag = other.m_owning_obj_tag;
        }
        return *this;
    }

    BusinessObjectExtenderRef& operator = (
        tag_t owning_obj_tag               
        )
    {
        m_pointee = 0;
        m_owning_obj_tag = owning_obj_tag;
        return *this;
    }

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

    const T& operator*() const { return *getPointee(); }

    template <typename U> bool isInstanceOf() const
    {
        return dynamic_cast<U*>(getPointee()) ? true : false;
    }

    virtual ~BusinessObjectExtenderRef()
    {
        m_pointee = 0;
    }

private:

    T* getPointee() const
    {
        if ( m_owning_obj_tag && !m_pointee )
        {
            m_pointee = T::extenderRegistry().findExtenderObject( m_owning_obj_tag );
        }
        return m_pointee;
    }

    template<typename S> friend class BusinessObjectExtenderRef;

    tag_t m_owning_obj_tag;

    mutable T* m_pointee;
};

#endif