///////////////////////////////////////////////////////////////////////////

//

// 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.

// *       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.

//

///////////////////////////////////////////////////////////////////////////

//-----------------------------------------------------------------------------

//

//	class Attribute

//

//-----------------------------------------------------------------------------

#include <ImfAttribute.h>

#include "IlmThreadMutex.h"

#include "Iex.h"

#include <string.h>

#include <map>

#include "ImfNamespace.h"

OPENEXR_IMF_INTERNAL_NAMESPACE_SOURCE_ENTER 

using ILMTHREAD_NAMESPACE::Mutex;

using ILMTHREAD_NAMESPACE::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_NAMESPACE::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_NAMESPACE::ArgExc, "Cannot create image file attribute of "

			    "unknown type \"" << typeName << "\".");

    return (i->second)();

}

OPENEXR_IMF_INTERNAL_NAMESPACE_SOURCE_EXIT