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## org.apache.lucene.util.automaton
Class BasicAutomata

    java.lang.Object
      org.apache.lucene.util.automaton.BasicAutomata

    public final class BasicAutomata

extends Object

Construction of basic automata.

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

Method Summary
`static Automaton` | `makeAnyChar()` Returns a new (deterministic) automaton that accepts any single codepoint.
`static Automaton` | `makeAnyString()` Returns a new (deterministic) automaton that accepts all strings.
`static Automaton` | `makeChar(int c)` Returns a new (deterministic) automaton that accepts a single codepoint of the given value.
`static Automaton` | `makeCharRange(int min, int max)` Returns a new (deterministic) automaton that accepts a single codepoint whose value is in the given interval (including both end points).
`static Automaton` | `makeEmpty()` Returns a new (deterministic) automaton with the empty language.
`static Automaton` | `makeEmptyString()` Returns a new (deterministic) automaton that accepts only the empty string.
`static Automaton` | `makeInterval(int min, int max, int digits)` Returns a new automaton that accepts strings representing decimal non-negative integers in the given interval.
`static Automaton` | `makeString(int[] word, int offset, int length)`
`static Automaton` | `makeString(String s)` Returns a new (deterministic) automaton that accepts the single given string.
`static Automaton` | `makeStringUnion(Collection<BytesRef> utf8Strings)` Returns a new (deterministic and minimal) automaton that accepts the union of the given collection of `BytesRef`s representing UTF-8 encoded strings.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Method Detail

### makeEmpty

    public static Automaton makeEmpty()

  Returns a new (deterministic) automaton with the empty language.

### makeEmptyString

    public static Automaton makeEmptyString()

  Returns a new (deterministic) automaton that accepts only the empty string.

### makeAnyString

    public static Automaton makeAnyString()

  Returns a new (deterministic) automaton that accepts all strings.

### makeAnyChar

    public static Automaton makeAnyChar()

  Returns a new (deterministic) automaton that accepts any single codepoint.

### makeChar

    public static Automaton makeChar(int c)

  Returns a new (deterministic) automaton that accepts a single codepoint of the given value.

### makeCharRange

    public static Automaton makeCharRange(int min,
                                          int max)

  Returns a new (deterministic) automaton that accepts a single codepoint whose value is in the given interval (including both end points).

### makeInterval

    public static Automaton makeInterval(int min,
                                         int max,
                                         int digits)
                                  throws IllegalArgumentException

  Returns a new automaton that accepts strings representing decimal non-negative integers in the given interval.

  Parameters:
    `min` - minimal value of interval
    `max` - maximal value of interval (both end points are included in the interval)
    `digits` - if >0, use fixed number of digits (strings must be prefixed by 0's to obtain the right length) - otherwise, the number of digits is not fixed
  Throws:
    `IllegalArgumentException` - if min>max or if numbers in the interval cannot be expressed with the given fixed number of digits

### makeString

    public static Automaton makeString(String s)

  Returns a new (deterministic) automaton that accepts the single given string.

### makeString

    public static Automaton makeString(int[] word,
                                       int offset,
                                       int length)

### makeStringUnion

    public static Automaton makeStringUnion(Collection<BytesRef> utf8Strings)

  Returns a new (deterministic and minimal) automaton that accepts the union of the given collection of `BytesRef`s representing UTF-8 encoded strings.

  Parameters:
    `utf8Strings` - The input strings, UTF-8 encoded. The collection must be in sorted order.
  Returns:
    An `Automaton` accepting all input strings. The resulting automaton is codepoint based (full unicode codepoints on transitions).

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