/**
* @param identifier
* @return The requested {@link ThumbnailsCreator} or the first available of the requested one is not available. Returns null if no {@link ThumbnailsCreator} is available.
*/
public static ThumbnailsCreator getCreator(String identifier){
ThumbnailsCreator retVal = null;
if(CREATORS!=null && identifier!=null && identifier.length()>0){
for(ThumbnailsCreator creator: CREATORS){
if(identifier.equals(creator.getCreatorIdentifier())){
retVal = creator;
break;