public ContentTypeEngine registerContentTypeEngine ( Class < ? extends ContentTypeEngine > engineClass ) { ContentTypeEngine engine ; try { engine = engineClass . newInstance ( ) ; } catch ( Exception e ) { throw new PippoRuntimeException ( e , "Failed to instantiate '{}'" , engineClass . getName ( ) ) ; } if ( ! engines . containsKey ( engine . getContentType ( ) ) ) { setContentTypeEngine ( engine ) ; return engine ; } else { log . debug ( "'{}' content engine already registered, ignoring '{}'" , engine . getContentType ( ) , engineClass . getName ( ) ) ; return null ; } }
Registers a content type engine if no other engine has been registered for the content type .