After generification of iterators, this line in Lucas doesn't compile:
In src/main/java, org.apache.uima.lucas.indexer.analysis,
the class: AnnotationTokenStream
line 340:
annotationIterator =
Iterators.filter(jCas.getAnnotationIndex(annotationType).iterator(),
new NotNullPredicate<Annotation>());
gives message:
The method filter(Iterator<T>, Predicate<? super T>) in the type
Iterators is not applicable for the arguments (FSIterator<AnnotationFS>,
AnnotationTokenStream.NotNullPredicate<Annotation>)
I observe that if I change
new NotNullPredicate<Annotation>()); // to
new NotNullPredicate<AnnotationFS>());
that the error goes away, but is replaced with another error:
Type mismatch: cannot convert from Iterator<AnnotationFS> to
Iterator<Annotation>
I think the original form assigns to T the value AnnotationFS. This
makes the assignment of the predicate NotNullPredicate<X> have the type
X be a super type of AnnotationFS. But Annotation is a subtype, not a
supertype. So it fails.
I think the JCas version of
getAnnotationIndex(annotationType).iterator() should end up returning an
iterator over Annotation, not AnnotationFS. This would fix this, I think.
Opinions?
-Marshall
