/**
* Calculates the document frequency of annotations of the given annotation type in the corpus.
* Annotations are transformed into strings using the given toString function.
*
* @param type the annotation type to count.
* @param toString the function to convert Annotations into strings
* @return A counter containing document frequencies of the given annotation type
*/
default Counter<String> documentFrequencies(
@NonNull AnnotationType type, @NonNull Function<? super Annotation, String> toString) {
return new HashMapCounter<>(
Cast.cast(
stream()
.flatMap(
document ->
document
.get(type)
.stream()
.map(toString)
.distinct()
.collect(Collectors.toList()))
.countByValue()));
}
@Override
public Resource createResource(String specification, Map<String, String> properties) {
BeanMap beanMap = new BeanMap(new FileResource(specification));
beanMap.putAll(properties);
return Cast.as(beanMap.getBean());
}