question: public Result invoke ( String opName , Geometry geometry , Object [ ] args ) throws Exception { boolean isBufferOp = opName . equalsIgnoreCase ( "buffer" ) ; if ( ! isBufferOp ) { return chainOp . invoke ( opName , geometry , args ) ; } parseArgs ( args ) ; return invokeBufferOpValidated ( geometry , args ) ; }
target:  Invokes the named operation