java : add StateLessStateMachineTest.java

1 files changed, 106 insertions, 0 deletions

diff --git a/java/StateLessStateMachineTest.java b/java/StateLessStateMachineTest.java
new file mode 100644
index 0000000..19417d9
--- /dev/null
+++ b/java/StateLessStateMachineTest.java
@@ -0,0 +1,106 @@
+
+import java.util.Random;
+
+abstract class CommonState implements StateLessStateMachine.MachineState
+{
+    protected void say()
+    {
+        System.out.println(" # " + this.getClass().getName());
+    }
+}
+
+class StartState extends CommonState
+{
+    public StateLessStateMachine.State process()
+    {
+        say();
+        System.out.println("   GO!");
+        return StateLessStateMachine.State.TRY;
+    }
+}
+
+class TryState extends CommonState
+{
+    public StateLessStateMachine.State process()
+    {
+        StateLessStateMachine.State nextState = null;
+
+        say();
+
+        int i = (new Random()).nextInt(6);
+        switch (i) {
+            case 1:
+                System.out.println("   -> Success");
+                nextState = StateLessStateMachine.State.SUCCESS;
+                break;
+            default:
+                System.out.println("   -> Failure");
+                nextState = StateLessStateMachine.State.FAILURE;
+                break;
+        }
+
+        return nextState;
+    }
+}
+
+class FailureState extends CommonState
+{
+    public StateLessStateMachine.State process()
+    {
+        say();
+        System.out.println("   -> Retry");
+        return StateLessStateMachine.State.TRY;
+    }
+}
+
+class SuccessState extends CommonState
+{
+    public StateLessStateMachine.State process()
+    {
+        say();
+        System.out.println("   -> well done");
+        return StateLessStateMachine.State.STOP;
+    }
+}
+
+class StateLessStateMachine
+{
+    public enum State
+    {
+        STOP(-1), START(0), TRY(1), SUCCESS(2), FAILURE(3);
+        public int i;
+        State(int i) { this.i = i; }
+    }
+
+    interface MachineState
+    {
+        public State process();
+    }
+
+    private MachineState[] states = {
+        new StartState(),
+        new TryState(),
+        new SuccessState(),
+        new FailureState()
+    };
+
+    public State process(State currentState)
+    {
+        if (currentState == State.STOP) return currentState;
+        return states[currentState.i].process();
+    }
+}
+
+public class StateLessStateMachineTest
+{
+    public static void main(String [] args )
+    {
+        System.out.println(StateLessStateMachineTest.class.getName());
+        StateLessStateMachine stm = new StateLessStateMachine();
+
+        StateLessStateMachine.State st = StateLessStateMachine.State.START;
+        do {
+            st = stm.process(st);
+        } while (st != StateLessStateMachine.State.STOP);
+    }
+}