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ImfAttribute.cpp

///////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2002, 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.
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// 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
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///////////////////////////////////////////////////////////////////////////



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

#include <ImfAttribute.h>
#include "IlmThreadMutex.h"
#include "Iex.h"
#include <string.h>
#include <map>


namespace Imf {

using IlmThread::Mutex;
using IlmThread::Lock;


Attribute::Attribute () {}


Attribute::~Attribute () {}


namespace {

struct NameCompare: std::binary_function <const char *, const char *, bool>
{
    bool
    operator () (const char *x, const char *y) const
    {
      return strcmp (x, y) < 0;
    }
};


typedef Attribute* (*Constructor)();
typedef std::map <const char *, Constructor, NameCompare> TypeMap;


class LockedTypeMap: public TypeMap
{
  public:

    Mutex mutex;
};


LockedTypeMap &
typeMap ()
{
    static Mutex criticalSection;
    Lock lock (criticalSection);

    static LockedTypeMap* typeMap = 0;

    if (typeMap == 0)
      typeMap = new LockedTypeMap ();

    return *typeMap;
}


} // namespace


bool        
Attribute::knownType (const char typeName[])
{
    LockedTypeMap& tMap = typeMap();
    Lock lock (tMap.mutex);

    return tMap.find (typeName) != tMap.end();
}


void  
Attribute::registerAttributeType (const char typeName[],
                            Attribute *(*newAttribute)())
{
    LockedTypeMap& tMap = typeMap();
    Lock lock (tMap.mutex);

    if (tMap.find (typeName) != tMap.end())
      THROW (Iex::ArgExc, "Cannot register image file attribute "
                      "type \"" << typeName << "\". "
                      "The type has already been registered.");

    tMap.insert (TypeMap::value_type (typeName, newAttribute));
}


void
Attribute::unRegisterAttributeType (const char typeName[])
{
    LockedTypeMap& tMap = typeMap();
    Lock lock (tMap.mutex);

    tMap.erase (typeName);
}


Attribute *
Attribute::newAttribute (const char typeName[])
{
    LockedTypeMap& tMap = typeMap();
    Lock lock (tMap.mutex);

    TypeMap::const_iterator i = tMap.find (typeName);

    if (i == tMap.end())
      THROW (Iex::ArgExc, "Cannot create image file attribute of "
                      "unknown type \"" << typeName << "\".");

    return (i->second)();
}


} // namespace Imf

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