Package org.apache.lucene.search

Class BooleanQuery

java.lang.Object
org.apache.lucene.search.Query
org.apache.lucene.search.BooleanQuery
All Implemented Interfaces:
Cloneable, Iterable<BooleanClause>
public class BooleanQuery extends Query implements Iterable<BooleanClause>
A Query that matches documents matching boolean combinations of other queries, e.g. TermQuerys, PhraseQuerys or other BooleanQuerys.

  • Field Details

    • minNrShouldMatch

      protected int minNrShouldMatch

  • Constructor Details

    • BooleanQuery

      public BooleanQuery()
      Constructs an empty boolean query.

    • BooleanQuery

      public BooleanQuery(boolean disableCoord)
      Constructs an empty boolean query. Similarity.coord(int,int) may be disabled in scoring, as appropriate. For example, this score factor does not make sense for most automatically generated queries, like WildcardQuery and FuzzyQuery.
      Parameters:
      disableCoord - disables Similarity.coord(int,int) in scoring.

  • Method Details

    • getMaxClauseCount

      public static int getMaxClauseCount()
      Return the maximum number of clauses permitted, 1024 by default. Attempts to add more than the permitted number of clauses cause BooleanQuery.TooManyClauses to be thrown.
      See Also:

    • setMaxClauseCount

      public static void setMaxClauseCount(int maxClauseCount)
      Set the maximum number of clauses permitted per BooleanQuery. Default value is 1024.

    • isCoordDisabled

      public boolean isCoordDisabled()
      Returns true iff Similarity.coord(int,int) is disabled in scoring for this query instance.
      See Also:

    • setMinimumNumberShouldMatch

      public void setMinimumNumberShouldMatch(int min)
      Specifies a minimum number of the optional BooleanClauses which must be satisfied.

      By default no optional clauses are necessary for a match (unless there are no required clauses). If this method is used, then the specified number of clauses is required.

      Use of this method is totally independent of specifying that any specific clauses are required (or prohibited). This number will only be compared against the number of matching optional clauses.

      Parameters:
      min - the number of optional clauses that must match

    • getMinimumNumberShouldMatch

      public int getMinimumNumberShouldMatch()
      Gets the minimum number of the optional BooleanClauses which must be satisfied.

    • add

      public void add(Query query, BooleanClause.Occur occur)
      Adds a clause to a boolean query.
      Throws:
      BooleanQuery.TooManyClauses - if the new number of clauses exceeds the maximum clause number
      See Also:

    • add

      public void add(BooleanClause clause)
      Adds a clause to a boolean query.
      Throws:
      BooleanQuery.TooManyClauses - if the new number of clauses exceeds the maximum clause number
      See Also:

    • getClauses

      public BooleanClause[] getClauses()
      Returns the set of clauses in this query.

    • clauses

      public List<BooleanClause> clauses()
      Returns the list of clauses in this query.

    • iterator

      public final Iterator<BooleanClause> iterator()
      Returns an iterator on the clauses in this query. It implements the Iterable interface to make it possible to do: 
      for (BooleanClause clause : booleanQuery) {}
      Specified by:
      iterator in interface Iterable<BooleanClause>

    • createWeight

      public Weight createWeight(IndexSearcher searcher) throws IOException
      Description copied from class: Query
      Expert: Constructs an appropriate Weight implementation for this query.

      Only implemented by primitive queries, which re-write to themselves.

      Overrides:
      createWeight in class Query
      Throws:
      IOException

    • rewrite

      public Query rewrite(IndexReader reader) throws IOException
      Description copied from class: Query
      Expert: called to re-write queries into primitive queries. For example, a PrefixQuery will be rewritten into a BooleanQuery that consists of TermQuerys.
      Overrides:
      rewrite in class Query
      Throws:
      IOException

    • extractTerms

      public void extractTerms(Set<Term> terms)
      Description copied from class: Query
      Expert: adds all terms occurring in this query to the terms set. Only works if this query is in its rewritten form.
      Overrides:
      extractTerms in class Query

    • clone

      public BooleanQuery clone()
      Description copied from class: Query
      Returns a clone of this query.
      Overrides:
      clone in class Query

    • toString

      public String toString(String field)
      Prints a user-readable version of this query.
      Specified by:
      toString in class Query

    • equals

      public boolean equals(Object o)
      Returns true iff o is equal to this.
      Overrides:
      equals in class Query

    • hashCode

      public int hashCode()
      Returns a hash code value for this object.
      Overrides:
      hashCode in class Query