BlendType.h

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/* $Id: BlendType.h 35082 2011-02-22 19:30:37Z jesterking $
-----------------------------------------------------------------------------
This source file is part of VideoTexture library

Copyright (c) 2006 The Zdeno Ash Miklas

This program is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by the Free Software
Foundation; either version 2 of the License, or (at your option) any later
version.

This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with
this program; if not, write to the Free Software Foundation, Inc., 59 Temple
Place - Suite 330, Boston, MA 02111-1307, USA, or go to
http://www.gnu.org/copyleft/lesser.txt.
-----------------------------------------------------------------------------
*/

#if !defined BLENDTYPE_H
#define BLENDTYPE_H


template <class PyObj> class BlendType
{
public:
        BlendType (const char * name) : m_name(name) {}

        PyObj * checkType (PyObject * obj)
        {
                // if pointer to type isn't set 
                if (m_objType == NULL)
                {
                        // compare names of type
                        if (strcmp(obj->ob_type->tp_name, m_name) == 0)
                                // if name of type match, save pointer to type
                                m_objType = obj->ob_type;
                        else
                                // if names of type don't match, return NULL
                                return NULL;
                }
                // if pointer to type is set and don't match to type of provided object, return NULL
                else if (obj->ob_type != m_objType) 
                        return NULL;
                // return pointer to object, this class can only be used for KX object =>
                // the Py object is actually a proxy
                return (PyObj*)BGE_PROXY_REF(obj);
        }

        PyObj * parseArg (PyObject * args)
        {
                // parse arguments
                PyObject * obj;
                if (PyArg_ParseTuple(args, "O", &obj))
                        // if successfully parsed, return pointer to object
                        return checkType(obj);
                // otherwise return NULL
                return NULL;
        }

protected:
        const char * m_name;
        PyTypeObject * m_objType;
};


#endif