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ImfAttribute.h

///////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2004, Industrial Light & Magic, a division of Lucas
// Digital Ltd. LLC
// 
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
// *       Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// *       Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// *       Neither the name of Industrial Light & Magic nor the names of
// its contributors may be used to endorse or promote products derived
// from this software without specific prior written permission. 
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
///////////////////////////////////////////////////////////////////////////



#ifndef INCLUDED_IMF_ATTRIBUTE_H
#define INCLUDED_IMF_ATTRIBUTE_H

//-----------------------------------------------------------------------------
//
//    class Attribute
//
//-----------------------------------------------------------------------------

#include "IexBaseExc.h"
#include <ImfIO.h>
#include <ImfXdr.h>


namespace Imf {


class Attribute
{
  public:

    //---------------------------
    // Constructor and destructor
    //---------------------------

    Attribute ();
    virtual ~Attribute ();


    //-------------------------------
    // Get this attribute's type name
    //-------------------------------

    virtual const char *      typeName () const = 0;


    //------------------------------
    // Make a copy of this attribute
    //------------------------------

    virtual Attribute *       copy () const = 0;


    //----------------------------------------
    // Type-specific attribute I/O and copying
    //----------------------------------------

    virtual void        writeValueTo (OStream &os,
                                    int version) const = 0;

    virtual void        readValueFrom (IStream &is,
                                     int size,
                                     int version) = 0;

    virtual void        copyValueFrom (const Attribute &other) = 0;


    //------------------
    // Attribute factory
    //------------------

    static Attribute *        newAttribute (const char typeName[]);


    //-----------------------------------------------------------
    // Test if a given attribute type has already been registered
    //-----------------------------------------------------------

    static bool               knownType (const char typeName[]);


  protected:

    //--------------------------------------------------
    // Register an attribute type so that newAttribute()
    // knows how to make objects of this type.
    //--------------------------------------------------

    static void         registerAttributeType (const char typeName[],
                                     Attribute *(*newAttribute)());

    //------------------------------------------------------
    // Un-register an attribute type so that newAttribute()
    // no longer knows how to make objects of this type (for
    // debugging only).
    //------------------------------------------------------

    static void         unRegisterAttributeType (const char typeName[]);
};


//-------------------------------------------------
// Class template for attributes of a specific type
//-------------------------------------------------

template <class T>
class TypedAttribute: public Attribute
{
  public:

    //----------------------------
    // Constructors and destructor
    //------------_---------------

    TypedAttribute ();
    TypedAttribute (const T &value);
    TypedAttribute (const TypedAttribute<T> &other);
    virtual ~TypedAttribute ();


    //--------------------------------
    // Access to the attribute's value
    //--------------------------------

    T &                             value ();
    const T &                       value () const;


    //--------------------------------
    // Get this attribute's type name.
    //--------------------------------

    virtual const char *            typeName () const;
    

    //---------------------------------------------------------
    // Static version of typeName()
    // This function must be specialized for each value type T.
    //---------------------------------------------------------

    static const char *             staticTypeName ();
    

    //---------------------
    // Make a new attribute
    //---------------------

    static Attribute *              makeNewAttribute ();


    //------------------------------
    // Make a copy of this attribute
    //------------------------------

    virtual Attribute *             copy () const;


    //-----------------------------------------------------------------
    // Type-specific attribute I/O and copying.
    // Depending on type T, these functions may have to be specialized.
    //-----------------------------------------------------------------

    virtual void        writeValueTo (OStream &os,
                                    int version) const;

    virtual void        readValueFrom (IStream &is,
                                     int size,
                                     int version);

    virtual void        copyValueFrom (const Attribute &other);


    //------------------------------------------------------------
    // Dynamic casts that throw exceptions instead of returning 0.
    //------------------------------------------------------------

    static TypedAttribute *         cast (Attribute *attribute);
    static const TypedAttribute *   cast (const Attribute *attribute);
    static TypedAttribute &         cast (Attribute &attribute);
    static const TypedAttribute &   cast (const Attribute &attribute);


    //---------------------------------------------------------------
    // Register this attribute type so that Attribute::newAttribute()
    // knows how to make objects of this type.
    //
    // Note that this function is not thread-safe because it modifies
    // a global variable in the IlmIlm library.  A thread in a multi-
    // threaded program may call registerAttributeType() only when no
    // other thread is accessing any functions or classes in the
    // IlmImf library.
    //
    //---------------------------------------------------------------

    static void                     registerAttributeType ();


    //-----------------------------------------------------
    // Un-register this attribute type (for debugging only)
    //-----------------------------------------------------

    static void                      unRegisterAttributeType ();


  private:

    T                         _value;
};


//------------------------------------
// Implementation of TypedAttribute<T>
//------------------------------------

template <class T>
TypedAttribute<T>::TypedAttribute (): _value (T())
{
    // empty
}


template <class T>
TypedAttribute<T>::TypedAttribute (const T &value): _value (value)
{
    // empty
}


template <class T>
TypedAttribute<T>::TypedAttribute (const TypedAttribute<T> &other):
    _value ()
{
    copyValueFrom (other);
}


template <class T>
TypedAttribute<T>::~TypedAttribute ()
{
    // empty
}


template <class T>
inline T &
TypedAttribute<T>::value ()
{
    return _value;
}


template <class T>
inline const T &
TypedAttribute<T>::value () const
{
    return _value;
}


template <class T>
const char *      
TypedAttribute<T>::typeName () const
{
    return staticTypeName();
}


template <class T>
Attribute *
TypedAttribute<T>::makeNewAttribute ()
{
    return new TypedAttribute<T>();
}


template <class T>
Attribute *
TypedAttribute<T>::copy () const
{
    Attribute * attribute = new TypedAttribute<T>();
    attribute->copyValueFrom (*this);
    return attribute;
}


template <class T>
void        
TypedAttribute<T>::writeValueTo (OStream &os, int version) const
{
    Xdr::write <StreamIO> (os, _value);
}


template <class T>
void        
TypedAttribute<T>::readValueFrom (IStream &is, int size, int version)
{
    Xdr::read <StreamIO> (is, _value);
}


template <class T>
void        
TypedAttribute<T>::copyValueFrom (const Attribute &other)
{
    _value = cast(other)._value;
}


template <class T>
TypedAttribute<T> *
TypedAttribute<T>::cast (Attribute *attribute)
{
    TypedAttribute<T> *t =
      dynamic_cast <TypedAttribute<T> *> (attribute);

    if (t == 0)
      throw Iex::TypeExc ("Unexpected attribute type.");

    return t;
}


template <class T>
const TypedAttribute<T> *
TypedAttribute<T>::cast (const Attribute *attribute)
{
    const TypedAttribute<T> *t =
      dynamic_cast <const TypedAttribute<T> *> (attribute);

    if (t == 0)
      throw Iex::TypeExc ("Unexpected attribute type.");

    return t;
}


template <class T>
inline TypedAttribute<T> &    
TypedAttribute<T>::cast (Attribute &attribute)
{
    return *cast (&attribute);
}


template <class T>
inline const TypedAttribute<T> &
TypedAttribute<T>::cast (const Attribute &attribute)
{
    return *cast (&attribute);
}


template <class T>
inline void
TypedAttribute<T>::registerAttributeType ()
{
    Attribute::registerAttributeType (staticTypeName(), makeNewAttribute);
}


template <class T>
inline void
TypedAttribute<T>::unRegisterAttributeType ()
{
    Attribute::unRegisterAttributeType (staticTypeName());
}


} // namespace Imf

#if defined(OPENEXR_DLL) && defined(_MSC_VER)
    // Tell MS VC++ to disable "non dll-interface class used as base
    // for dll-interface class" and "no suitable definition provided
    // for explicit template"
    #pragma warning (disable : 4275 4661)

    #if defined (ILMIMF_EXPORTS)
      #define IMF_EXPIMP_TEMPLATE
    #else
      #define IMF_EXPIMP_TEMPLATE extern
    #endif

    IMF_EXPIMP_TEMPLATE template class Imf::TypedAttribute<float>;
    IMF_EXPIMP_TEMPLATE template class Imf::TypedAttribute<double>;

    #pragma warning(default : 4251)
    #undef EXTERN_TEMPLATE
#endif

// Metrowerks compiler wants the .cpp file inlined, too
#ifdef __MWERKS__
#include <ImfAttribute.cpp>
#endif

#endif

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