question: private String processHost ( String host ) { if ( host != null ) { if ( ValidationUtil . isFunction ( host ) ) { host = FunctionHandler . executeFunction ( host , variables ) ; } else if ( ValidationUtil . isVariable ( host ) ) { host = variables . getVariable ( host ) ; } host = variables . evaluate ( host ) ; } return host ; }
target:  process the value of the host and returns the actual value if it is a function or a variable definition.