com.hazelcast.util

Class StateMachine<T extends Enum<T>>

java.lang.Object

com.hazelcast.util.StateMachine<T>

Type Parameters:

T -

public class StateMachine<T extends Enum<T>>
extends Object

Simple state machine using an Enum as possible states.

Constructor Summary

Constructors

Constructor and Description
StateMachine(T initialState)

Method Summary

Modifier and Type	Method and Description
boolean	is(T state, T... otherStates) Check if current state is one of given states
StateMachine<T>	next(T nextState) Transition to next state
void	nextOrStay(T nextState) Transition to next state if not already there
static <T extends Enum<T>> StateMachine<T>	of(T initialState)
String	toString()
StateMachine<T>	withTransition(T from, T to, T... moreTo) Add a valid transition from one state to one or more states

Methods inherited from class java.lang.Object

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

Constructor Detail

StateMachine

public StateMachine(T initialState)

Method Detail

of

public static <T extends Enum<T>> StateMachine<T> of(T initialState)

withTransition

public StateMachine<T> withTransition(T from,
                                      T to,
                                      T... moreTo)

Add a valid transition from one state to one or more states

next

public StateMachine<T> next(T nextState)
                     throws IllegalStateException

Transition to next state

Throws:

IllegalStateException - if transition is not allowed

NullPointerException - if the nextState is null

nextOrStay

public void nextOrStay(T nextState)

Transition to next state if not already there

Throws:

IllegalStateException - if transition is not allowed

NullPointerException - if the nextState is null

is

public boolean is(T state,
                  T... otherStates)

Check if current state is one of given states

toString

public String toString()

Overrides:

toString in class Object