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}.

    Terms terms = indexReader.terms(field);
    if (terms == null) {
      return null;
    }
    TermsEnum iterator = terms.iterator(null);
    if (iterator.seekExact(term)) {
      return iterator.docs(bits, null, random().nextBoolean() ? DocsEnum.FLAG_FREQS : DocsEnum.FLAG_NONE);
    }
    return null;
  }

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

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

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        }
        termsEnum = terms.iterator(termsEnum);
        assert termsEnum != null;
        
        if (termsEnum == TermsEnum.EMPTY) continue;
        if (termsEnum.seekExact(term.bytes())) {
          if (termContext == null) {
            contextArray[i] = new TermContext(reader.getContext(),
                termsEnum.termState(), context.ord, termsEnum.docFreq(),
                termsEnum.totalTermFreq());
          } else {

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            TermsEnum termsEnum = null;
            SortedSet<BytesRef> joinValues = new TreeSet<BytesRef>(BytesRef.getUTF8SortedAsUnicodeComparator());
            joinValues.addAll(joinValueToJoinScores.keySet());
            for (BytesRef joinValue : joinValues) {
              termsEnum = terms.iterator(termsEnum);
              if (termsEnum.seekExact(joinValue)) {
                docsEnum = termsEnum.docs(slowCompositeReader.getLiveDocs(), docsEnum, DocsEnum.FLAG_NONE);
                JoinScore joinScore = joinValueToJoinScores.get(joinValue);


                for (int doc = docsEnum.nextDoc(); doc != DocIdSetIterator.NO_MORE_DOCS; doc = docsEnum.nextDoc()) {
                  // First encountered join value determines the score.

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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()) : "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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        DocsAndPositionsEnum dpe = null;
        if (fields != null) {
          Terms terms = fields.terms(term.field());
          if (terms != null) {
            TermsEnum te = terms.iterator(null); // no use for reusing
            if (te.seekExact(term.bytes())) {
              // we're not expected to be called for deleted documents
              dpe = te.docsAndPositions(null, null, DocsAndPositionsEnum.FLAG_PAYLOADS);
            }
          }
        }

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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")));
    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")));
      disi = te.docsAndPositions(null, disi);
      docid = disi.docID();
      assertEquals(-1, docid);
      assertTrue(disi.nextDoc() != DocIdSetIterator.NO_MORE_DOCS);
      reader.close();

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