Examples of org.apache.lucene.search.Weight

org.apache.lucene.search.Weight
Expert: Calculate query weights and build query scorers.
The purpose of {@link Weight} is to ensure searching does not modify a{@link Query}, so that a {@link Query} instance can be reused.
{@link IndexSearcher} dependent state of the query should reside in the{@link Weight}.
{@link AtomicReader} dependent state should reside in the {@link Scorer}.
Since {@link Weight} creates {@link Scorer} instances for a given{@link AtomicReaderContext} ({@link #scorer(AtomicReaderContext,boolean,boolean,Bits)}) callers must maintain the relationship between the searcher's top-level {@link IndexReaderContext} and the context used to create a {@link Scorer}.
A Weight is used in the following way:
1. A Weight is constructed by a top-level query, given a IndexSearcher ( {@link Query#createWeight(IndexSearcher)}).
2. The {@link #getValueForNormalization()} method is called on theWeight to compute the query normalization factor {@link Similarity#queryNorm(float)} of the query clauses contained in thequery.
3. The query normalization factor is passed to {@link #normalize(float,float)}. At this point the weighting is complete.
4. A Scorer is constructed by {@link #scorer(AtomicReaderContext,boolean,boolean,Bits)}.
@since 2.9

      Sort sort = getSort();
      TopDocs hits;
      final int numHits = numHits();
      if (numHits > 0) {
        if (sort != null) {
          Weight w = q.weight(searcher);
          TopFieldCollector collector = TopFieldCollector.create(sort, numHits,
                                                                 true, withScore(),
                                                                 withMaxScore(),
                                                                 !w.scoresDocsOutOfOrder());
          searcher.search(w, null, collector);
          hits = collector.topDocs();
        } else {
          hits = searcher.search(q, numHits);
        }

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    // Delete by query
    IndexSearcher searcher = new IndexSearcher(reader);
    for (Entry<Query, Integer> entry : deletesFlushed.queries.entrySet()) {
      Query query = entry.getKey();
      int limit = entry.getValue().intValue();
      Weight weight = query.weight(searcher);
      Scorer scorer = weight.scorer(reader, true, false);
      if (scorer != null) {
        while(true)  {
          int doc = scorer.nextDoc();
          if (((long) docIDStart) + doc >= limit)
            break;

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    LuceneIndexHelper.fieldShouldExistInIndex(searcher, idField);
    for (String field : lucene2SeqConfiguration.getFields()) {
        LuceneIndexHelper.fieldShouldExistInIndex(searcher, field);
    }


    Weight weight = lucene2SeqConfiguration.getQuery().createWeight(searcher);
    scorer = weight.scorer(segmentReader.getContext(), false, false, null);
    if (scorer == null) {
      throw new IllegalArgumentException("Could not create query scorer for query: "
          + lucene2SeqConfiguration.getQuery());
    }
  }

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   * @throws IOException in case a search exception occurs
   */
  private void updateTopDocs(int n) throws IOException {
    int totalMaxDocs = searcher.getSearcher().maxDoc();
    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 ) {

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        res = browser.browse(req);
        hits = res.getHits();
      }
      else {
        Map<String, FacetAccessible> facetCollectors = new HashMap<String, FacetAccessible>();
        Weight w = req.getQuery().createWeight(browser);
        browser.browse(req, w, collector, facetCollectors, offset);


        try {
          /**
           * A custom collector must implement topDocs() method and a getHitsFeatures() method.

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    }
  }


  @Override
  public void search(Query query, Filter filter, Collector collector) throws IOException {
    Weight weight = createNormalizedWeight(query);
    search(weight, filter, collector, 0, null);
  }

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    LuceneIndexHelper.fieldShouldExistInIndex(segmentReader, idField);
    for (String field : lucene2SeqConfiguration.getFields()) {
        LuceneIndexHelper.fieldShouldExistInIndex(segmentReader, field);
    }


    Weight weight = lucene2SeqConfiguration.getQuery().createWeight(searcher);
    scorer = weight.scorer(segmentReader.getContext(), false, false, null);
    if (scorer == null) {
      throw new IllegalArgumentException("Could not create query scorer for query: "
          + lucene2SeqConfiguration.getQuery());
    }
  }

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   * @throws IOException in case a search exception occurs
   */
  private void updateTopDocs(int n) throws IOException {
    int totalMaxDocs = searcher.getSearcher().maxDoc();
    final int maxDocs = Math.min( n, totalMaxDocs );
    final Weight weight = preparedQuery.weight( searcher.getSearcher() );


    TopDocsCollector<?> topDocCollector = createTopDocCollector( maxDocs, weight );
    Collector collector = decorateWithTimeOutCollector( topDocCollector );


    boolean timeoutNow = isImmediateTimeout();

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   * @throws IOException in case a search exception occurs
   */
  private void updateTopDocs(int n) throws IOException {
    int totalMaxDocs = searcher.getSearcher().maxDoc();
    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 ) {

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    iter = deletesFlushed.queries.entrySet().iterator();
    while(iter.hasNext()) {
      Entry entry = (Entry) iter.next();
      Query query = (Query) entry.getKey();
      int limit = ((Integer) entry.getValue()).intValue();
      Weight weight = query.weight(searcher);
      Scorer scorer = weight.scorer(reader, true, false);
      if (scorer != null) {
        while(true)  {
          int doc = scorer.nextDoc();
          if (((long) docIDStart) + doc >= limit)
            break;

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