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package org.glassfish.jersey.message.filtering;
import java.lang.annotation.Annotation;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import org.glassfish.jersey.message.filtering.spi.FilteringHelper;
/**
* Utility methods for Entity Data Filtering.
*
* @author Michal Gajdos
*/
final class EntityFilteringHelper {
/**
* Get entity-filtering scopes from given annotations. Scopes are only derived from entity-filtering annotations.
*
* @param annotations list of arbitrary annotations.
* @return a set of entity-filtering scopes.
*/
public static Set<String> getFilteringScopes(final Annotation[] annotations) {
return getFilteringScopes(annotations, true);
}
/**
* Get entity-filtering scopes from given annotations. Scopes are only derived from entity-filtering annotations.
*
* @param annotations list of arbitrary annotations.
* @param filter {@code true} whether the given annotation should be reduced to only entity-filtering annotations,
* {@code false} otherwise.
* @return a set of entity-filtering scopes.
*/
public static Set<String> getFilteringScopes(Annotation[] annotations, final boolean filter) {
if (annotations.length == 0) {
return Collections.emptySet();
}
final Set<String> contexts = new HashSet<>(annotations.length);
annotations = filter ? getFilteringAnnotations(annotations) : annotations;
for (final Annotation annotation : annotations) {
contexts.add(annotation.annotationType().getName());
}
return contexts;
}
/**
* Filter given annotations and return only entity-filtering ones.
*
* @param annotations list of arbitrary annotations.
* @return entity-filtering annotations or an empty array.
*/
public static Annotation[] getFilteringAnnotations(final Annotation[] annotations) {
if (annotations == null || annotations.length == 0) {
return FilteringHelper.EMPTY_ANNOTATIONS;
}
final List<Annotation> filteringAnnotations = new ArrayList<>(annotations.length);
for (final Annotation annotation : annotations) {
final Class<? extends Annotation> annotationType = annotation.annotationType();
for (final Annotation metaAnnotation : annotationType.getDeclaredAnnotations()) {
if (metaAnnotation instanceof EntityFiltering) {
filteringAnnotations.add(annotation);
}
}
}
return filteringAnnotations.toArray(new Annotation[filteringAnnotations.size()]);
}
public static <T extends Annotation> T getAnnotation(final Annotation[] annotations, final Class<T> clazz) {
for (final Annotation annotation : annotations) {
if (annotation.annotationType().getClass().isAssignableFrom(clazz)) {
//noinspection unchecked
return (T) annotation;
}
}
return null;
}
/**
* Prevent instantiation.
*/
private EntityFilteringHelper() {
}
}