code: public <T> Clazz<T> Clazz( Class<T> clazz )
  	{
  		_ensureMap();
  
  		@SuppressWarnings( "unchecked" )
  		Clazz<T> res = (Clazz<T>) clazzz.get( clazz );
  		if( res == null )
  			throw new IllegalArgumentException( "Class not supported by ClassInfo : " + clazz.getName() );
  
  		return res;
  	}
docs: Obtain a runtime type information on a class.<br/>
  <br/>
  
  Throws a RuntimeException if the type information provider is not found.
  
  @param clazz
  The class object for which type information is required
  @return The runtime information interface