Examples of org.apache.lucene.index.FilterIndexReader

org.apache.lucene.index.FilterIndexReader

A FilterIndexReader contains another IndexReader, which it uses as its basic source of data, possibly transforming the data along the way or providing additional functionality. The class FilterIndexReader itself simply implements all abstract methods of IndexReader with versions that pass all requests to the contained index reader. Subclasses of FilterIndexReader may further override some of these methods and may also provide additional methods and fields.

Note: The default implementation of {@link FilterIndexReader#doOpenIfChanged}throws {@link UnsupportedOperationException} (like the base class),so it's not possible to reopen a FilterIndexReader. To reopen, you have to first reopen the underlying reader and wrap it again with the custom filter.

  }
  ***/


  public IndexReader dummyIndexReader(final int maxDoc) {


    IndexReader r = new FilterIndexReader(null) {
      @Override
      public int maxDoc() {
        return maxDoc;
      }

  }
  ***/


  public IndexReader dummyIndexReader(final int maxDoc) {


    IndexReader r = new FilterIndexReader(null) {
      @Override
      public int maxDoc() {
        return maxDoc;
      }

      }
    } else if (highlightCnstScrRngQuery && query instanceof ConstantScoreRangeQuery) {
      ConstantScoreRangeQuery q = (ConstantScoreRangeQuery) query;
      Term lower = new Term(fieldName, q.getLowerVal());
      Term upper = new Term(fieldName, q.getUpperVal());
      FilterIndexReader fir = new FilterIndexReader(getReaderForField(fieldName));
      try {
        TermEnum te = fir.terms(lower);
        BooleanQuery bq = new BooleanQuery();
        do {
          Term term = te.term();
          if (term != null && upper.compareTo(term) >= 0) {
            bq.add(new BooleanClause(new TermQuery(term), BooleanClause.Occur.SHOULD));
          } else {
            break;
          }
        } while (te.next());
        extract(bq, terms);
      } finally {
        fir.close();
      }
    } 
  }

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