Package org.apache.lucene.queries.intervals

# Class IntervalsSource

java.lang.Object
org.apache.lucene.queries.intervals.IntervalsSource

Direct Known Subclasses:
  `FilteredIntervalsSource`

public abstract class IntervalsSource extends Object
A helper class for `IntervalQuery` that provides an `IntervalIterator` for a given field and segment

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

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `IntervalsSource()`

- ## Method Summary

  Modifier and Type
  Method
  Description
  `abstract boolean`
  `equals(Object other)`
  `abstract int`
  `hashCode()`
  `abstract IntervalIterator`
  `intervals(String field, LeafReaderContext ctx)`
  Create an `IntervalIterator` exposing the minimum intervals defined by this `IntervalsSource`
  `abstract IntervalMatchesIterator`
  `matches(String field, LeafReaderContext ctx, int doc)`
  Return a `MatchesIterator` over the intervals defined by this `IntervalsSource` for a given document and field
  `abstract int`
  `minExtent()`
  Return the minimum possible width of an interval returned by this source
  `abstract Collection<IntervalsSource>`
  `pullUpDisjunctions()`
  Expert: return the set of disjunctions that make up this IntervalsSource
  `abstract String`
  `toString()`
  `abstract void`
  `visit(String field, QueryVisitor visitor)`
  Expert: visit the tree of sources

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

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

- ## Constructor Details

  - ### IntervalsSource

    public IntervalsSource()

- ## Method Details

  - ### intervals

    public abstract IntervalIterator intervals(String field, LeafReaderContext ctx) throws IOException
    Create an `IntervalIterator` exposing the minimum intervals defined by this `IntervalsSource`

    Returns `null` if no intervals for this field exist in this segment

    Parameters:
      `field` - the field to read positions from
      `ctx` - the context for which to return the iterator
    Throws:
      `IOException`

  - ### matches

    public abstract IntervalMatchesIterator matches(String field, LeafReaderContext ctx, int doc) throws IOException
    Return a `MatchesIterator` over the intervals defined by this `IntervalsSource` for a given document and field

    Returns `null` if no intervals exist in the given document and field

    Parameters:
      `field` - the field to read positions from
      `ctx` - the document's context
      `doc` - the document to return matches for
    Throws:
      `IOException`

  - ### visit

    public abstract void visit(String field, QueryVisitor visitor)
    Expert: visit the tree of sources

  - ### minExtent

    public abstract int minExtent()
    Return the minimum possible width of an interval returned by this source

  - ### pullUpDisjunctions

    public abstract Collection<IntervalsSource> pullUpDisjunctions()
    Expert: return the set of disjunctions that make up this IntervalsSource

    Most implementations can return `Collections.singleton(this)`

  - ### hashCode

    public abstract int hashCode()
    Overrides:
      `hashCode` in class `Object`

  - ### equals

    public abstract boolean equals(Object other)
    Overrides:
      `equals` in class `Object`

  - ### toString

    public abstract String toString()
    Overrides:
      `toString` in class `Object`