Examples of org.apache.lucene.search.Collector

org.apache.lucene.search.Collector
re scorer public void setScorer(Scorer scorer) { } // accept docs out of order (for a BitSet it doesn't matter) public boolean acceptsDocsOutOfOrder() { return true; } public void collect(int doc) { bits.set(doc + docBase); } public void setNextReader(IndexReader reader, int docBase) { this.docBase = docBase; } });
Not all collectors will need to rebase the docID. For example, a collector that simply counts the total number of hits would skip it.

NOTE: Prior to 2.9, Lucene silently filtered out hits with score <= 0. As of 2.9, the core Collectors no longer do that. It's very unusual to have such hits (a negative query boost, or function query returning negative custom scores, could cause it to happen). If you need that behavior, use {@link PositiveScoresOnlyCollector}.

NOTE: This API is experimental and might change in incompatible ways in the next release.
@since 2.9

      throw new IllegalArgumentException("query must not be null");
    
    IndexSearcher searcher = createSearcher();
    try {
      final float[] scores = new float[1]; // inits to 0.0f (no match)
      searcher.search(query, new Collector() {
        private Scorer scorer;


        @Override
        public void collect(int doc) throws IOException {
          scores[0] = scorer.score();

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      // Verify docs are always collected in order.  If we
      // had an AssertingScorer it could catch it when
      // Weight.scoresDocsOutOfOrder lies!:
      new DrillSideways(s, tr).search(ddq,
                           new Collector() {
                             int lastDocID;


                             @Override
                             public void setScorer(Scorer s) {
                             }

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    final int maxDocs = Math.min( n, totalMaxDocs );
    final Weight weight = preparedQuery.weight( searcher.getSearcher() );


    final TopDocsCollector<?> topDocCollector;
    final TotalHitCountCollector hitCountCollector;
    Collector collector = null;
    if ( maxDocs != 0 ) {
      topDocCollector = createTopDocCollector( maxDocs, weight );
      hitCountCollector = null;
      collector = topDocCollector;
      collector = optionallyEnableFieldCacheOnTypes( collector, totalMaxDocs, maxDocs );

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  private Collector optionallyEnableFacetingCollectors(Collector collector) {
    if ( facetRequests == null || facetRequests.isEmpty() ) {
      return collector;
    }
    facetCollectors = new ArrayList<FacetCollector>();
    Collector nextInChain = collector;
    for ( FacetingRequestImpl entry : facetRequests.values() ) {
      FacetCollector facetCollector = new FacetCollector( nextInChain, entry );
      nextInChain = facetCollector;
      facetCollectors.add( facetCollector );
    }

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    }
    return timeoutAt0;
  }


  private Collector decorateWithTimeOutCollector(Collector collector) {
    Collector maybeTimeLimitingCollector = collector;
    if ( timeoutManager.getType() == TimeoutManager.Type.LIMIT ) {
      final Long timeoutLeft = timeoutManager.getTimeoutLeftInMilliseconds();
      if ( timeoutLeft != null ) {
        Counter counter = timeoutManager.getLuceneTimeoutCounter();
        maybeTimeLimitingCollector = new TimeLimitingCollector( collector, counter, timeoutLeft);

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    final int maxDocs = Math.min( n, totalMaxDocs );
    final Weight weight = preparedQuery.weight( searcher.getSearcher() );


    final TopDocsCollector<?> topDocCollector;
    final TotalHitCountCollector hitCountCollector;
    Collector collector = null;
    if ( maxDocs != 0 ) {
      topDocCollector = createTopDocCollector( maxDocs, weight );
      hitCountCollector = null;
      collector = topDocCollector;
      collector = optionallyEnableFieldCacheOnTypes( collector, totalMaxDocs, maxDocs );

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  private Collector optionallyEnableFacetingCollectors(Collector collector) {
    if ( facetRequests == null || facetRequests.isEmpty() ) {
      return collector;
    }
    facetCollectors = new ArrayList<FacetCollector>();
    Collector nextInChain = collector;
    for ( FacetingRequestImpl entry : facetRequests.values() ) {
      FacetCollector facetCollector = new FacetCollector( nextInChain, entry );
      nextInChain = facetCollector;
      facetCollectors.add( facetCollector );
    }

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    }
    return timeoutAt0;
  }


  private Collector decorateWithTimeOutCollector(Collector collector) {
    Collector maybeTimeLimitingCollector = collector;
    if ( timeoutManager.getType() == TimeoutManager.Type.LIMIT ) {
      final Long timeoutLeft = timeoutManager.getTimeoutLeftInMilliseconds();
      if ( timeoutLeft != null ) {
        Counter counter = timeoutManager.getLuceneTimeoutCounter();
        maybeTimeLimitingCollector = new TimeLimitingCollector( collector, counter, timeoutLeft);

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    final int maxDocs = Math.min( n, totalMaxDocs );
    final Weight weight = preparedQuery.weight( searcher.getSearcher() );


    final TopDocsCollector<?> topDocCollector;
    final TotalHitCountCollector hitCountCollector;
    Collector collector = null;
    if ( maxDocs != 0 ) {
      topDocCollector = createTopDocCollector( maxDocs, weight );
      hitCountCollector = null;
      collector = topDocCollector;
      collector = optionallyEnableFieldCacheOnTypes( collector, totalMaxDocs, maxDocs );

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  private Collector optionallyEnableFacetingCollectors(Collector collector) {
    if ( facetRequests == null || facetRequests.isEmpty() ) {
      return collector;
    }
    facetCollectors = new ArrayList<FacetCollector>();
    Collector nextInChain = collector;
    for ( FacetingRequestImpl entry : facetRequests.values() ) {
      FacetCollector facetCollector = new FacetCollector( nextInChain, entry );
      nextInChain = facetCollector;
      facetCollectors.add( facetCollector );
    }

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