/**
* If there are unclustered documents, appends the "Other Topics" group to the <code>clusters
* </code>.
*
* @see #buildOtherTopics(List, List, String)
*/
public static void appendOtherTopics(
List<Document> allDocuments, List<Cluster> clusters, String label) {
final Cluster otherTopics = buildOtherTopics(allDocuments, clusters, label);
if (!otherTopics.getDocuments().isEmpty()) {
clusters.add(otherTopics);
}
}
private Collection<Document> collectDocuments(
Collection<Cluster> clusters, Collection<Document> documents) {
for (final Cluster cluster : clusters) {
documents.addAll(cluster.getDocuments());
collectDocuments(cluster.getSubclusters());
}
return documents;
}
/** A recursive routine for collecting unique documents from this cluster and subclusters. */
private static Set<Document> collectAllDocuments(Cluster cluster, Set<Document> docs) {
if (cluster == null) {
return docs;
}
docs.addAll(cluster.getDocuments());
final List<Cluster> subclusters = cluster.getSubclusters();
for (final Cluster subcluster : subclusters) {
collectAllDocuments(subcluster, docs);
}
return docs;
}