org.apache.lucene.util.automaton
Class Transition

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

All Implemented Interfaces:

Cloneable

public class Transition
extends Object
implements Cloneable

Automaton transition.

A transition, which belongs to a source state, consists of a Unicode codepoint interval and a destination state.

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

Field Summary

static Comparator<Transition>	CompareByDestThenMinMax
static Comparator<Transition>	CompareByMinMaxThenDest

Constructor Summary

Transition(int min, int max, State to)
Constructs a new transition.

Transition(int c, State to)
Constructs a new singleton interval transition.

Method Summary

Transition	clone() Clones this transition.
boolean	equals(Object obj) Checks for equality.
State	getDest() Returns destination of this transition.
int	getMax() Returns maximum of this transition interval.
int	getMin() Returns minimum of this transition interval.
int	hashCode() Returns hash code.
String	toString() Returns a string describing this state.

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

CompareByDestThenMinMax

public static final Comparator<Transition> CompareByDestThenMinMax

CompareByMinMaxThenDest

public static final Comparator<Transition> CompareByMinMaxThenDest

Constructor Detail

Transition

public Transition(int c,
                  State to)

Constructs a new singleton interval transition.

Parameters:

c - transition codepoint

to - destination state

Transition

public Transition(int min,
                  int max,
                  State to)

Constructs a new transition. Both end points are included in the interval.

Parameters:

min - transition interval minimum

max - transition interval maximum

to - destination state

Method Detail

getMin

public int getMin()

Returns minimum of this transition interval.

getMax

public int getMax()

Returns maximum of this transition interval.

getDest

public State getDest()

Returns destination of this transition.

equals

public boolean equals(Object obj)

Checks for equality.

Overrides:

equals in class Object

Parameters:

obj - object to compare with

Returns:

true if obj is a transition with same character interval and destination state as this transition.

hashCode

public int hashCode()

Returns hash code. The hash code is based on the character interval (not the destination state).

Overrides:

hashCode in class Object

Returns:

hash code

clone

public Transition clone()

Clones this transition.

Overrides:

clone in class Object

Returns:

clone with same character interval and destination state

toString

public String toString()

Returns a string describing this state. Normally invoked via Automaton.toString().

Overrides:

toString in class Object