question: protected JavaFileObject preferredFileObject ( JavaFileObject a , JavaFileObject b ) { if ( preferSource ) return ( a . getKind ( ) == JavaFileObject . Kind . SOURCE ) ? a : b ; else { long adate = a . getLastModified ( ) ; long bdate = b . getLastModified ( ) ; return ( adate > bdate ) ? a : b ; } }
target:  Implement policy to choose to derive information from a source file or a class file when both are present.  May be overridden by subclasses.