Current File : //usr/include/OpenEXR/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,
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// 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"
#include "ImfForward.h"
#include "ImfExport.h"
#include "ImfNamespace.h"
OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_ENTER
class IMF_EXPORT 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 (OPENEXR_IMF_INTERNAL_NAMESPACE::OStream &os,
int version) const = 0;
virtual void readValueFrom (OPENEXR_IMF_INTERNAL_NAMESPACE::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 (OPENEXR_IMF_INTERNAL_NAMESPACE::OStream &os,
int version) const;
virtual void readValueFrom (OPENEXR_IMF_INTERNAL_NAMESPACE::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 ():
Attribute (),
_value (T())
{
// empty
}
template <class T>
TypedAttribute<T>::TypedAttribute (const T & value):
Attribute (),
_value (value)
{
// empty
}
template <class T>
TypedAttribute<T>::TypedAttribute (const TypedAttribute<T> &other):
Attribute (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 (OPENEXR_IMF_INTERNAL_NAMESPACE::OStream &os,
int version) const
{
OPENEXR_IMF_INTERNAL_NAMESPACE::Xdr::write <OPENEXR_IMF_INTERNAL_NAMESPACE::StreamIO> (os, _value);
}
template <class T>
void
TypedAttribute<T>::readValueFrom (OPENEXR_IMF_INTERNAL_NAMESPACE::IStream &is,
int size,
int version)
{
OPENEXR_IMF_INTERNAL_NAMESPACE::Xdr::read <OPENEXR_IMF_INTERNAL_NAMESPACE::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_NAMESPACE::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_NAMESPACE::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());
}
OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_EXIT
#endif
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