Examples of org.apache.lucene.index.TermsEnum.seekExact()

org.apache.lucene.index.TermsEnum.seekExact()
Attempts to seek to the exact term, returning true if the term is found. If this returns false, the enum is unpositioned. For some codecs, seekExact may be substantially faster than {@link #seekCeil}.

    
    for (BytesRef b : shuffledTests) {
      leftEnum = leftTerms.iterator(leftEnum);
      rightEnum = rightTerms.iterator(rightEnum);
      
      assertEquals(leftEnum.seekExact(b, false), rightEnum.seekExact(b, false));
      assertEquals(leftEnum.seekExact(b, true), rightEnum.seekExact(b, true));
      
      SeekStatus leftStatus;
      SeekStatus rightStatus;

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    for (BytesRef b : shuffledTests) {
      leftEnum = leftTerms.iterator(leftEnum);
      rightEnum = rightTerms.iterator(rightEnum);
      
      assertEquals(leftEnum.seekExact(b, false), rightEnum.seekExact(b, false));
      assertEquals(leftEnum.seekExact(b, true), rightEnum.seekExact(b, true));
      
      SeekStatus leftStatus;
      SeekStatus rightStatus;
      
      leftStatus = leftEnum.seekCeil(b, false);

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    assertEquals(-1, docid);
    assertTrue(disi.nextDoc() != DocIdSetIterator.NO_MORE_DOCS);
    
    // now reuse and check again
    TermsEnum te = reader.terms("foo").iterator(null);
    assertTrue(te.seekExact(new BytesRef("bar"), true));
    disi = te.docs(null, disi, DocsEnum.FLAG_NONE);
    docid = disi.docID();
    assertEquals(-1, docid);
    assertTrue(disi.nextDoc() != DocIdSetIterator.NO_MORE_DOCS);
    reader.close();

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      assertEquals(0, disi.startOffset());
      assertEquals(3, disi.endOffset());
      
      // now reuse and check again
      TermsEnum te = reader.terms("foo").iterator(null);
      assertTrue(te.seekExact(new BytesRef("bar"), true));
      disi = te.docsAndPositions(null, disi);
      docid = disi.docID();
      assertEquals(-1, docid);
      assertTrue(disi.nextDoc() != DocIdSetIterator.NO_MORE_DOCS);
      reader.close();

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        final TermState state = states[i].get(context.ord);
        if (state == null) { /* term doesnt exist in this segment */
          assert termNotInReader(reader, t): "no termstate found but term exists in reader";
          return null;
        }
        te.seekExact(t.bytes(), state);
        DocsAndPositionsEnum postingsEnum = te.docsAndPositions(liveDocs, null, DocsEnum.FLAG_NONE);


        // PhraseQuery on a field that did not index
        // positions.
        if (postingsEnum == null) {

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        DocsAndPositionsEnum postingsEnum = te.docsAndPositions(liveDocs, null, DocsEnum.FLAG_NONE);


        // PhraseQuery on a field that did not index
        // positions.
        if (postingsEnum == null) {
          assert te.seekExact(t.bytes(), false) : "termstate found but no term exists in reader";
          // term does exist, but has no positions
          throw new IllegalStateException("field \"" + t.field() + "\" was indexed without position data; cannot run PhraseQuery (term=" + t.text() + ")");
        }
        postingsFreqs[i] = new PostingsAndFreq(postingsEnum, te.docFreq(), positions.get(i).intValue(), t);
      }

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            nullCount++;
            continue;
          }
          dims[dim].docsEnums = new DocsEnum[drillDownTerms[dim].length];
          for(int i=0;i<drillDownTerms[dim].length;i++) {
            if (termsEnum.seekExact(drillDownTerms[dim][i].bytes(), false)) {
              dims[dim].freq = Math.max(dims[dim].freq, termsEnum.docFreq());
              dims[dim].docsEnums[i] = termsEnum.docs(null, null);
            }
          }
        }

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        assert termNotInReader(context.reader(), term) : "no termstate found but term exists in reader term=" + term;
        return null;
      }
      //System.out.println("LD=" + reader.getLiveDocs() + " set?=" + (reader.getLiveDocs() != null ? reader.getLiveDocs().get(0) : "null"));
      final TermsEnum termsEnum = context.reader().terms(term.field()).iterator(null);
      termsEnum.seekExact(term.bytes(), state);
      return termsEnum;
    }
    
    private boolean termNotInReader(AtomicReader reader, Term term) throws IOException {
      // only called from assert

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      final Fields fields = context.reader().fields();
      if (fields != null) {
        final Terms terms = fields.terms(term.field());
        if (terms != null) {
          final TermsEnum termsEnum = terms.iterator(null);
          if (termsEnum.seekExact(term.bytes(), true)) { 
            state = termsEnum.termState();
          } else {
            state = null;
          }
        } else {

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    if (state == null) { // term is not present in that reader
      return TermSpans.EMPTY_TERM_SPANS;
    }
    
    final TermsEnum termsEnum = context.reader().terms(term.field()).iterator(null);
    termsEnum.seekExact(term.bytes(), state);
    
    final DocsAndPositionsEnum postings = termsEnum.docsAndPositions(acceptDocs, null, DocsAndPositionsEnum.FLAG_PAYLOADS);


    if (postings != null) {
      return new TermSpans(postings, term);

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