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}.

    final Terms terms = MultiFields.getTerms(r, field);
    if (terms == null) {
      return null;
    }
    final TermsEnum termsEnum = terms.iterator(null);
    if (!termsEnum.seekExact(term)) {
      return null;
    }
    return docs(random, termsEnum, liveDocs, reuse, flags);
  }

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      DocsEnum docs = null; // reuse
      for (AtomicReaderContext ctx : reader.leaves()) {
        Terms terms = ctx.reader().terms(Consts.FULL);
        if (terms != null) {
          termsEnum = terms.iterator(termsEnum);
          if (termsEnum.seekExact(catTerm)) {
            // liveDocs=null because the taxonomy has no deletes
            docs = termsEnum.docs(null, docs, 0 /* freqs not required */);
            // if the term was found, we know it has exactly one document.
            doc = docs.nextDoc() + ctx.docBase;
            break;

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        assert this.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(final AtomicReader reader, final Term term) throws IOException {
      // only called from assert

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


        final DocsNodesAndPositionsEnum postingsEnum = NodePhraseQuery.this.getDocsNodesAndPositionsEnum(te.docsAndPositions(liveDocs, null));


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

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        final DocsNodesAndPositionsEnum postingsEnum = NodePhraseQuery.this.getDocsNodesAndPositionsEnum(te.docsAndPositions(liveDocs, null));


        // PhraseQuery on a field that did not index positions (maybe not a siren field)
        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 NodePhraseQuery " +
              "(term=" + t.text() + ")");
        }

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

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          }
        }


        final TermsEnum.SeekStatus status;
        if (nextID == null) {
          if (termsEnum.seekExact(new BytesRef(id))) {
            status = TermsEnum.SeekStatus.FOUND;
          } else {
            status = TermsEnum.SeekStatus.NOT_FOUND;
          }
        } else {

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            TermState termState = termContexts.get(term).get(context.ord);
            if (termState == null) {
              // Term not in reader
              continue;
            }
            termsEnum.seekExact(term.bytes(), termState);
            docFreq += termsEnum.docFreq();
          }


          if (docFreq == 0) {
            // None of the terms are in this reader

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          TermState termState = termContexts.get(term).get(context.ord);
          if (termState == null) {
            // Term not in reader
            return null;
          }
          termsEnum.seekExact(term.bytes(), termState);
          postingsEnum = termsEnum.docsAndPositions(liveDocs, null, DocsEnum.FLAG_NONE);


          if (postingsEnum == null) {
            // term does exist, but has no positions
            assert termsEnum.docs(liveDocs, null, DocsEnum.FLAG_NONE) != null: "termstate found but no term exists in reader";

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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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