How to use

getClusters

method

in

org.carrot2.core.ProcessingResult

tempAttributes.put(AttributeNames.CLUSTERS, getClusters());

public Object cluster(Query query, DocList docList, SolrQueryRequest sreq) {
 try {
  // Prepare attributes for Carrot2 clustering call
  Map<String, Object> attributes = new HashMap<String, Object>();
  List<Document> documents = getDocuments(docList, query, sreq);
  attributes.put(AttributeNames.DOCUMENTS, documents);
  attributes.put(AttributeNames.QUERY, query.toString());
  // Pass extra overriding attributes from the request, if any
  extractCarrotAttributes(sreq.getParams(), attributes);
  // Perform clustering and convert to named list
  return clustersToNamedList(controller.process(attributes,
      clusteringAlgorithmClass).getClusters(), sreq.getParams());
 } catch (Exception e) {
  log.error("Carrot2 clustering failed", e);
  throw new RuntimeException(e);
 }
}

@Override
protected void afterFetch(SearchEngineResponse response,
  ProcessingResult processingResult)
{
  if (readClusters) {
    final Set<String> ids = Sets.newHashSet();
    List<Document> documents = processingResult.getDocuments();
    if (documents == null) documents = Collections.emptyList();
    List<Cluster> clusters = processingResult.getClusters();
    if (documents != null && clusters != null) {
      for (Document doc : documents) {
        ids.add(doc.getStringId());
      }

      Predicate<Document> docFilter = new Predicate<Document>()
      {
        @Override
        public boolean apply(Document input)
        {
          return input != null && ids.contains(input.getStringId());
        }
      };
      this.clusters = sanityCheck(clusters, docFilter);
    }
  }
}

if (getClusters() != null)
  clusters = Lists.newArrayList(getClusters());

this.clusters = processingResult.getClusters();

@Override
public Object cluster(Query query, SolrDocumentList solrDocList,
  Map<SolrDocument, Integer> docIds, SolrQueryRequest sreq) {
 try {
  // Prepare attributes for Carrot2 clustering call
  Map<String, Object> attributes = new HashMap<>();
  List<Document> documents = getDocuments(solrDocList, docIds, query, sreq);
  attributes.put(AttributeNames.DOCUMENTS, documents);
  attributes.put(AttributeNames.QUERY, query.toString());

  // Pass the fields on which clustering runs.
  attributes.put("solrFieldNames", getFieldsForClustering(sreq));

  // Pass extra overriding attributes from the request, if any
  extractCarrotAttributes(sreq.getParams(), attributes);

  // Perform clustering and convert to an output structure of clusters.
  //
  // Carrot2 uses current thread's context class loader to get
  // certain classes (e.g. custom tokenizer/stemmer) at runtime.
  // To make sure classes from contrib JARs are available,
  // we swap the context class loader for the time of clustering.
  return withContextClassLoader(core.getResourceLoader().getClassLoader(),
    () -> clustersToNamedList(controller.process(attributes,
      clusteringAlgorithmClass).getClusters(), sreq.getParams()));
 } catch (Exception e) {
  log.error("Carrot2 clustering failed", e);
  throw new SolrException(ErrorCode.SERVER_ERROR, "Carrot2 clustering failed", e);
 }
}

{response.toXContent(builder, request);}
if (processingResult != null && processingResult.getClusters() != null) {
  final Collection<Cluster> clusters = processingResult.getClusters();
  final Map<String, Object> attributes = processingResult.getAttributes();