private void validateInput ( ) { // Check for null values first. if ( url == null ) { throw new NullPointerException ( "URL should not be null" ) ; } if ( ! url . getProtocol ( ) . matches ( "^https?$" ) ) { throw new IllegalArgumentException ( "URL protocol should be HTTP or HTTPS" ) ; } if ( url . getRef ( ) != null ) { throw new IllegalArgumentException ( "URL should contain no reference" ) ; } if ( url . getQuery ( ) != null ) { throw new IllegalArgumentException ( "URL should contain no query string" ) ; } if ( handler == null ) { throw new NullPointerException ( "Callback handler should not be null" ) ; } }
Validates all the input to this client .