Package org.apache.lucene.queries.intervals

# Class IntervalQuery

java.lang.Object
org.apache.lucene.search.Query
org.apache.lucene.queries.intervals.IntervalQuery

public final class IntervalQuery extends Query
A query that retrieves documents containing intervals returned from an `IntervalsSource`

Static constructor functions for various different sources can be found in the `Intervals` class

Scores for this query are computed as a function of the sloppy frequency of intervals appearing in a particular document. Sloppy frequency is calculated from the number of matching intervals, and their width, with wider intervals contributing lower values. The scores can be adjusted with two optional parameters:

- pivot - the sloppy frequency value at which the overall score of the document will equal 0.5. The default value is 1
- exp - higher values of this parameter make the function grow more slowly below the pivot and faster higher than the pivot. The default value is 1

Optimal values for both pivot and exp depend on the type of queries and corpus of documents being queried.

Scores are bounded to between 0 and 1. For higher contributions, wrap the query in a `BoostQuery`

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `IntervalQuery(String field, IntervalsSource intervalsSource)`
  Create a new IntervalQuery
  `IntervalQuery(String field, IntervalsSource intervalsSource, float pivot)`
  Create a new IntervalQuery with a scoring pivot
  `IntervalQuery(String field, IntervalsSource intervalsSource, float pivot, float exp)`
  Create a new IntervalQuery with a scoring pivot and exponent

- ## Method Summary

  Modifier and Type
  Method
  Description
  `Weight`
  `createWeight(IndexSearcher searcher, ScoreMode scoreMode, float boost)`
  `boolean`
  `equals(Object o)`
  `String`
  `getField()`
  The field to query
  `int`
  `hashCode()`
  `String`
  `toString(String field)`
  `void`
  `visit(QueryVisitor visitor)`

  ### Methods inherited from class org.apache.lucene.search.Query

  `classHash, rewrite, sameClassAs, toString`

  ### Methods inherited from class java.lang.Object

  `clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

- ## Constructor Details

  - ### IntervalQuery

    public IntervalQuery(String field, IntervalsSource intervalsSource)
    Create a new IntervalQuery
    Parameters:
      `field` - the field to query
      `intervalsSource` - an `IntervalsSource` to retrieve intervals from

  - ### IntervalQuery

    public IntervalQuery(String field, IntervalsSource intervalsSource, float pivot)
    Create a new IntervalQuery with a scoring pivot
    Parameters:
      `field` - the field to query
      `intervalsSource` - an `IntervalsSource` to retrieve intervals from
      `pivot` - the sloppy frequency value at which the score will be 0.5, must be within (0, +Infinity)

  - ### IntervalQuery

    public IntervalQuery(String field, IntervalsSource intervalsSource, float pivot, float exp)
    Create a new IntervalQuery with a scoring pivot and exponent
    Parameters:
      `field` - the field to query
      `intervalsSource` - an `IntervalsSource` to retrieve intervals from
      `pivot` - the sloppy frequency value at which the score will be 0.5, must be within (0, +Infinity)
      `exp` - exponent, higher values make the function grow slower before 'pivot' and faster after 'pivot', must be in (0, +Infinity)

- ## Method Details

  - ### getField

    public String getField()
    The field to query

  - ### toString

    public String toString(String field)
    Specified by:
      `toString` in class `Query`

  - ### createWeight

    public Weight createWeight(IndexSearcher searcher, ScoreMode scoreMode, float boost) throws IOException
    Overrides:
      `createWeight` in class `Query`
    Throws:
      `IOException`

  - ### visit

    public void visit(QueryVisitor visitor)
    Specified by:
      `visit` in class `Query`

  - ### equals

    public boolean equals(Object o)
    Specified by:
      `equals` in class `Query`

  - ### hashCode

    public int hashCode()
    Specified by:
      `hashCode` in class `Query`