org.apache.lucene.util.automaton
Class BasicAutomata

java.lang.Object
  extended by 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(String s)
          Returns a new (deterministic) automaton that accepts the single given string.
 
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.



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