Examples of org.apache.lucene.search.BooleanClause

org.apache.lucene.search.BooleanClause
A clause in a BooleanQuery.

  }


  public void testBooleanQuery() throws ParseException {
    BooleanQuery bq = new BooleanQuery();
    Query q1 = new TermQuery(new Term("tags", "h*"));
    BooleanClause bc = new BooleanClause(q1, BooleanClause.Occur.MUST);
    bq.add(bc);
    doConvert(bq);
  }

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          fieldQuery = new BooleanQuery();
          bQuery.add(fieldQuery, matchAllConditions ? Occur.MUST : Occur.SHOULD);
        }


        /* Create the Clause */
        BooleanClause clause = null;
        if (condition.getField().getId() == IEntity.ALL_FIELDS)
          clause = createAllNewsFieldsClause(condition, matchAllConditions);
        else
          clause = createBooleanClause(condition, matchAllConditions);


        /*
         * Specially treat this case where the specifier is a negation but any
         * of the supplied conditions should match in the result set.
         */
        if (condition.getSpecifier().isNegation() && !matchAllConditions) {
          BooleanQuery nestedquery = new BooleanQuery();
          nestedquery.add(clause);
          nestedquery.add(new BooleanClause(new MatchAllDocsQuery(), Occur.MUST));
          fieldQuery.add(new BooleanClause(nestedquery, Occur.SHOULD));
        }


        /* Normal Case */
        else {
          fieldQuery.add(clause);
        }
      }


      /* Add the MatchAllDocsQuery (MUST_NOT is used, All Conditions match) */
      if (fieldQuery != null && matchAllConditions) {
        boolean requireAllDocsQuery = true;
        BooleanClause[] clauses = fieldQuery.getClauses();
        for (BooleanClause clause : clauses) {
          if (clause.getOccur() != Occur.MUST_NOT) {
            requireAllDocsQuery = false;
            break;
          }
        }


        /* Add if required */
        if (requireAllDocsQuery)
          fieldQuery.add(new BooleanClause(new MatchAllDocsQuery(), Occur.MUST));
      }


      /* Use custom hit collector for performance reasons */
      final List<SearchHit<NewsReference>> resultList = new ArrayList<SearchHit<NewsReference>>();
      HitCollector collector = new HitCollector() {

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    Occur occur = condition.getSpecifier().isNegation() ? Occur.MUST_NOT : Occur.SHOULD;
    EnumSet<INews.State> newsStates = (EnumSet<State>) condition.getValue();
    for (INews.State state : newsStates) {
      String value = String.valueOf(state.ordinal());
      TermQuery stateQuery = new TermQuery(new Term(fieldName, value));
      statesQuery.add(new BooleanClause(stateQuery, occur));
    }


    /* Check if the match-all-docs query is required */
    if (newsStates.size() == 1 && condition.getSpecifier().isNegation())
      statesQuery.add(new BooleanClause(new MatchAllDocsQuery(), Occur.MUST));
  }

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    while ((token = tokenStream.next()) != null) {
      String termText = token.termText();


      /* Contained in Title */
      WildcardQuery titleQuery = new WildcardQuery(new Term(String.valueOf(INews.TITLE), termText));
      allFieldsQuery.add(new BooleanClause(titleQuery, Occur.SHOULD));


      /* Contained in Description */
      WildcardQuery descriptionQuery = new WildcardQuery(new Term(String.valueOf(INews.DESCRIPTION), termText));
      allFieldsQuery.add(new BooleanClause(descriptionQuery, Occur.SHOULD));


      /* Contained in Attachment */
      WildcardQuery attachmentQuery = new WildcardQuery(new Term(String.valueOf(INews.ATTACHMENTS_CONTENT), termText));
      allFieldsQuery.add(new BooleanClause(attachmentQuery, Occur.SHOULD));


      /* Matches Author */
      WildcardQuery authorQuery = new WildcardQuery(new Term(String.valueOf(INews.AUTHOR), termText));
      allFieldsQuery.add(new BooleanClause(authorQuery, Occur.SHOULD));


      /* Matches Category */
      WildcardQuery categoryQuery = new WildcardQuery(new Term(String.valueOf(INews.CATEGORIES), termText));
      allFieldsQuery.add(new BooleanClause(categoryQuery, Occur.SHOULD));
    }


    /* Determine Occur (MUST, SHOULD, MUST NOT) */
    Occur occur = getOccur(condition.getSpecifier(), matchAllConditions);
    return new BooleanClause(allFieldsQuery, occur);
  }

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      query = createTermQuery(condition);
    }


    /* Determine Occur (MUST, SHOULD, MUST NOT) */
    Occur occur = getOccur(condition.getSpecifier(), matchAllConditions);
    return new BooleanClause(query, occur);
  }

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        LowercaseWhitespaceAnalyzer analyzer = new LowercaseWhitespaceAnalyzer();
        TokenStream tokenStream = analyzer.tokenStream(String.valueOf(IEntity.ALL_FIELDS), new StringReader(value));
        Token token = null;
        while ((token = tokenStream.next()) != null) {
          Term term = new Term(fieldname, token.termText());
          similarityQuery.add(new BooleanClause(new FuzzyQuery(term), Occur.MUST));
        }


        return similarityQuery;
      }
    }

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        fieldQuery = new BooleanQuery();
        bQuery.add(fieldQuery, matchAllConditions ? Occur.MUST : Occur.SHOULD);
      }


      /* Create the Clause */
      BooleanClause clause = null;
      if (condition.getField().getId() == IEntity.ALL_FIELDS)
        clause = createAllNewsFieldsClause(analyzer, condition, matchAllConditions);
      else
        clause = createBooleanClause(analyzer, condition, matchAllConditions);


      /* Check if the Clause has any valid Query */
      Query query = clause.getQuery();
      if (query instanceof BooleanQuery && ((BooleanQuery) query).clauses().isEmpty())
        continue;


      /*
       * Specially treat this case where the specifier is a negation but any of
       * the supplied conditions should match in the result set.
       */
      if (condition.getSpecifier().isNegation() && !matchAllConditions) {
        BooleanQuery nestedquery = new BooleanQuery();
        nestedquery.add(clause);
        nestedquery.add(new BooleanClause(new MatchAllDocsQuery(), Occur.MUST));
        fieldQuery.add(new BooleanClause(nestedquery, Occur.SHOULD));
      }


      /* Normal Case */
      else {
        fieldQuery.add(clause);
      }
    }


    /* Add the MatchAllDocsQuery (MUST_NOT is used, All Conditions match) */
    if (fieldQuery != null && matchAllConditions) {
      boolean requireAllDocsQuery = true;
      BooleanClause[] clauses = fieldQuery.getClauses();
      for (BooleanClause clause : clauses) {
        if (clause.getOccur() != Occur.MUST_NOT) {
          requireAllDocsQuery = false;
          break;
        }
      }


      /* Add if required */
      if (requireAllDocsQuery)
        fieldQuery.add(new BooleanClause(new MatchAllDocsQuery(), Occur.MUST));
    }
  }

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    Occur occur = condition.getSpecifier().isNegation() ? Occur.MUST_NOT : Occur.SHOULD;
    EnumSet<INews.State> newsStates = (EnumSet<State>) condition.getValue();
    for (INews.State state : newsStates) {
      String value = String.valueOf(state.ordinal());
      TermQuery stateQuery = new TermQuery(new Term(fieldName, value));
      statesQuery.add(new BooleanClause(stateQuery, occur));
    }


    /* Check if the match-all-docs query is required */
    if (condition.getSpecifier().isNegation())
      statesQuery.add(new BooleanClause(new MatchAllDocsQuery(), Occur.MUST));
  }

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        tokenConditions.add(tokenCondition);
      }


      /* Build custom Query out of Conditions */
      for (ISearchCondition tokenCondition : tokenConditions) {
        BooleanClause tokenClause = createAllNewsFieldsClause(analyzer, tokenCondition, matchAllConditions);


        /* Ignore empty clauses (e.g. due to Stop Words) */
        if (tokenClause.getQuery() instanceof BooleanQuery && ((BooleanQuery) tokenClause.getQuery()).getClauses().length == 0)
          continue;


        tokenClause.setOccur(Occur.MUST);
        allFieldsQuery.add(tokenClause);
      }
    }


    /* Require any word to be contained or not contained */
    else {
      List<ISearchCondition> allFieldsConditions = new ArrayList<ISearchCondition>(5);


      /* Title */
      ISearchField field = factory.createSearchField(INews.TITLE, condition.getField().getEntityName());
      allFieldsConditions.add(factory.createSearchCondition(field, condition.getSpecifier(), condition.getValue()));


      /* Description */
      field = factory.createSearchField(INews.DESCRIPTION, condition.getField().getEntityName());
      allFieldsConditions.add(factory.createSearchCondition(field, condition.getSpecifier(), condition.getValue()));


      /* Author */
      field = factory.createSearchField(INews.AUTHOR, condition.getField().getEntityName());
      allFieldsConditions.add(factory.createSearchCondition(field, condition.getSpecifier(), condition.getValue()));


      /* Category */
      field = factory.createSearchField(INews.CATEGORIES, condition.getField().getEntityName());
      List<String> tokens = StringUtils.tokenizePhraseAware(condition.getValue().toString());
      if (!tokens.contains(condition.getValue().toString()))
        tokens.add(condition.getValue().toString());
      for (String token : tokens) {
        allFieldsConditions.add(factory.createSearchCondition(field, condition.getSpecifier().isNegation() ? SearchSpecifier.IS_NOT : SearchSpecifier.IS, token));
      }


      /* Attachment Content */
      field = factory.createSearchField(INews.ATTACHMENTS_CONTENT, condition.getField().getEntityName());
      allFieldsConditions.add(factory.createSearchCondition(field, condition.getSpecifier(), condition.getValue()));


      /* Create Clauses out of Conditions */
      boolean anyClauseIsEmpty = false;
      List<BooleanClause> clauses = new ArrayList<BooleanClause>();
      for (ISearchCondition allFieldCondition : allFieldsConditions) {
        BooleanClause clause = createBooleanClause(analyzer, allFieldCondition, matchAllConditions);
        clause.setOccur(Occur.SHOULD);
        clauses.add(clause);


        /* Ignore empty clauses (e.g. due to Stop Words) */
        if (clause.getQuery() instanceof BooleanQuery && ((BooleanQuery) clause.getQuery()).getClauses().length == 0)
          anyClauseIsEmpty = true;
      }


      /* Only add if none of the clauses is empty */
      if (!anyClauseIsEmpty) {
        for (BooleanClause clause : clauses) {
          allFieldsQuery.add(clause);
        }
      }
    }


    /* Determine Occur (MUST, SHOULD, MUST NOT) */
    Occur occur = getOccur(condition.getSpecifier(), matchAllConditions);
    return new BooleanClause(allFieldsQuery, occur);
  }

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      query = createTermQuery(condition);
    }


    /* Determine Occur (MUST, SHOULD, MUST NOT) */
    Occur occur = getOccur(condition.getSpecifier(), matchAllConditions);
    return new BooleanClause(query, occur);
  }

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