Examples of org.apache.lucene.search.AutomatonQuery

org.apache.lucene.search.AutomatonQuery
A {@link Query} that will match terms against a finite-state machine.
This query will match documents that contain terms accepted by a given finite-state machine. The automaton can be constructed with the {@link org.apache.lucene.util.automaton} API. Alternatively, it can becreated from a regular expression with {@link RegexpQuery} or fromthe standard Lucene wildcard syntax with {@link WildcardQuery}.

When the query is executed, it will create an equivalent DFA of the finite-state machine, and will enumerate the term dictionary in an intelligent way to reduce the number of comparisons. For example: the regular expression of [dl]og? will make approximately four comparisons: do, dog, lo, and log.
@lucene.experimental


      Automaton alternate = BasicAutomata.makeStringUnion(matchedTerms);
      //System.out.println("match " + matchedTerms.size() + " " + alternate.getNumberOfStates() + " states, sigma=" + alternate.getStartPoints().length);
      //AutomatonTestUtil.minimizeSimple(alternate);
      //System.out.println("minmize done");
      AutomatonQuery a1 = new AutomatonQuery(new Term("field", ""), automaton);
      AutomatonQuery a2 = new AutomatonQuery(new Term("field", ""), alternate);
      CheckHits.checkEqual(a1, searcher.search(a1, 25).scoreDocs, searcher.search(a2, 25).scoreDocs);
    }
  }

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    } else if (query instanceof SpanPositionCheckQuery) {
      list.addAll(Arrays.asList(extractAutomata(((SpanPositionCheckQuery) query).getMatch(), field)));
    } else if (query instanceof SpanMultiTermQueryWrapper) {
      list.addAll(Arrays.asList(extractAutomata(((SpanMultiTermQueryWrapper<?>) query).getWrappedQuery(), field)));
    } else if (query instanceof AutomatonQuery) {
      final AutomatonQuery aq = (AutomatonQuery) query;
      if (aq.getField().equals(field)) {
        list.add(new CharacterRunAutomaton(aq.getAutomaton()) {
          @Override
          public String toString() {
            return aq.toString();
          }
        });
      }
    } else if (query instanceof PrefixQuery) {
      final PrefixQuery pq = (PrefixQuery) query;

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    } else if (query instanceof SpanPositionCheckQuery) {
      list.addAll(Arrays.asList(extractAutomata(((SpanPositionCheckQuery) query).getMatch(), field)));
    } else if (query instanceof SpanMultiTermQueryWrapper) {
      list.addAll(Arrays.asList(extractAutomata(((SpanMultiTermQueryWrapper<?>) query).getWrappedQuery(), field)));
    } else if (query instanceof AutomatonQuery) {
      final AutomatonQuery aq = (AutomatonQuery) query;
      if (aq.getField().equals(field)) {
        list.add(new CharacterRunAutomaton(aq.getAutomaton()) {
          @Override
          public String toString() {
            return aq.toString();
          }
        });
      }
    } else if (query instanceof PrefixQuery) {
      final PrefixQuery pq = (PrefixQuery) query;

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      Automaton alternate = BasicAutomata.makeStringUnion(matchedTerms);
      //System.out.println("match " + matchedTerms.size() + " " + alternate.getNumberOfStates() + " states, sigma=" + alternate.getStartPoints().length);
      //AutomatonTestUtil.minimizeSimple(alternate);
      //System.out.println("minmize done");
      AutomatonQuery a1 = new AutomatonQuery(new Term("field", ""), automaton);
      AutomatonQuery a2 = new AutomatonQuery(new Term("field", ""), alternate);
      CheckHits.checkEqual(a1, searcher.search(a1, 25).scoreDocs, searcher.search(a2, 25).scoreDocs);
    }
  }

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      Automaton alternate = BasicAutomata.makeStringUnion(matchedTerms);
      //System.out.println("match " + matchedTerms.size() + " " + alternate.getNumberOfStates() + " states, sigma=" + alternate.getStartPoints().length);
      //AutomatonTestUtil.minimizeSimple(alternate);
      //System.out.println("minmize done");
      AutomatonQuery a1 = new AutomatonQuery(new Term("field", ""), automaton);
      AutomatonQuery a2 = new AutomatonQuery(new Term("field", ""), alternate);
      CheckHits.checkEqual(a1, searcher.search(a1, 25).scoreDocs, searcher.search(a2, 25).scoreDocs);
    }
  }

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    } else if (query instanceof SpanPositionCheckQuery) {
      list.addAll(Arrays.asList(extractAutomata(((SpanPositionCheckQuery) query).getMatch(), field)));
    } else if (query instanceof SpanMultiTermQueryWrapper) {
      list.addAll(Arrays.asList(extractAutomata(((SpanMultiTermQueryWrapper<?>) query).getWrappedQuery(), field)));
    } else if (query instanceof AutomatonQuery) {
      final AutomatonQuery aq = (AutomatonQuery) query;
      if (aq.getField().equals(field)) {
        list.add(new CharacterRunAutomaton(aq.getAutomaton()) {
          @Override
          public String toString() {
            return aq.toString();
          }
        });
      }
    } else if (query instanceof PrefixQuery) {
      final PrefixQuery pq = (PrefixQuery) query;

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Related Classes of org.apache.lucene.search.AutomatonQuery

org.apache.lucene.index.TestTermsEnum2

org.apache.lucene.search.postingshighlight.MultiTermHighlighting

org.apache.lucene.util.automaton.CompiledAutomaton

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