Fluent state machine in Java

Event.java

package statemachine;

public class Event {
    final private String label;

    public Event(String newLabel) {
        label = newLabel;
    }

    /**
     * @return Returns the label.
     */
    public String getLabel() {
        return label;
    }

    public String toString() {
        return label;
    }
}

SampleFSMDef.java

package statemachine;

public class SampleFSMDef {

    public final static State SUBMITTED = new State("Submitted");
    public final static State OPEN = new State("Open");
    public final static State CANCELLED = new State("Cancelled");
    public final static State CLOSED = new State("Closed");

    //Events
    static class Events {
        public final static Event OPEN = new Event("Open");
        public final static Event CLOSE = new Event("Close");
        public final static Event REOPEN = new Event("Re-Open");
        public final static Event CANCEL = new Event("Cancel");
    }

    static {
        new Transition(Events.OPEN).from(SUBMITTED).to(OPEN);
        new Transition(Events.CLOSE).from(OPEN).to(CLOSED);
        new Transition(Events.REOPEN).from(CLOSED).to(OPEN);
        new Transition(Events.CANCEL).from(OPEN).to(CANCELLED);
    }

}

State.java

package statemachine;

import java.util.HashMap;
import java.util.Map;

public class State {

    private final String label;
    private final Map<Event, Transition> transitions = new HashMap<Event, Transition>();

    //no public access to the constructor, must be in the same package
    State(String newLabel) {
        this.label = newLabel;
    }

    void addTransition(Transition t) {
        transitions.put(t.getEvent(), t);
    }

    public State doEvent(Event e) {
        return (transitions.get(e)).getDestination();
    }

    /**
     * @return Returns the label.
     */
    public String getLabel() {
        return label;
    }

    /**
     * @return Returns the transitions.
     */
    public Map<Event, Transition> getTransitions() {
        return transitions;
    }

}

Transition.java

package statemachine;

public class Transition {
    private State origin, destination;
    private Event event;

    public Transition(Event e) {
        event = e;
    }

    public Transition from(State orig) {
        origin = orig;
        origin.addTransition(this);
        return this;
    }

    public Transition to(State dest) {
        destination = dest;
        return this;
    }

    /**
     * @return Returns the destination.
     */
    public State getDestination() {
        return destination;
    }

    /**
     * @return Returns the event.
     */
    public Event getEvent() {
        return event;
    }

    /**
     * @return Returns the origin.
     */
    public State getOrigin() {
        return origin;
    }
}