org.apache.lucene.util.automaton

## Class FiniteStringsIterator

- java.lang.Object
- - org.apache.lucene.util.automaton.FiniteStringsIterator

- Direct Known Subclasses:
    LimitedFiniteStringsIterator

      public class FiniteStringsIterator
      extends Object

  Iterates all accepted strings.

  If the `Automaton` has cycles then this iterator may throw an `IllegalArgumentException`, but this is not guaranteed!

  Be aware that the iteration order is implementation dependent and may change across releases.

  If the automaton is not determinized then it's possible this iterator will return duplicates.

  WARNING: This API is experimental and might change in incompatible ways in the next release.

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `FiniteStringsIterator(Automaton a)` Constructor.
    `FiniteStringsIterator(Automaton a, int startState, int endState)` Constructor.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `IntsRef` | `next()` Generate next finite string.

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

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### FiniteStringsIterator

          public FiniteStringsIterator(Automaton a)

      Constructor.
      Parameters:
        `a` - Automaton to create finite string from.

    - #### FiniteStringsIterator

          public FiniteStringsIterator(Automaton a,
                                       int startState,
                                       int endState)

      Constructor.
      Parameters:
        `a` - Automaton to create finite string from.
        `startState` - The starting state for each path.
        `endState` - The state where each path should stop or -1 if only accepted states should be final.

  - ### Method Detail

    - #### next

          public IntsRef next()

      Generate next finite string. The return value is just valid until the next call of this method!
      Returns:
        Finite string or null, if no more finite strings are available.

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