question: @ VisibleForTesting protected boolean alertColumnNumberChange ( boolean sourceIsMapped , int number , int originalNumber ) { if ( sourceIsMapped ) { if ( Integer . compare ( originalNumber , number ) != 0 ) { addActionWarning ( getText ( "manage.source.numColumns.changed" , new String [ ] { source . getName ( ) , String . valueOf ( originalNumber ) , String . valueOf ( number ) } ) ) ; return true ; } } return false ; }
target:  Alert user if the number of columns changed, when the existing source has already been mapped.