Expose extended state

- ExtendedState is now exposed via
  StateMachine interface.
- Add "sm variables" command to samples.

spring-statemachine-core/src/main/java/org/springframework/statemachine/StateMachine.java

@@ -37,6 +37,13 @@ public interface StateMachine<S, E> extends Region<S, E> {
 	 */
 	State<S,E> getInitialState();
 
+	/**
+	 * Gets the state machine extended state.
+	 *
+	 * @return extended state
+	 */
+	ExtendedState getExtendedState();
+
 	/**
 	 * Adds the state listener.
 	 *

spring-statemachine-core/src/main/java/org/springframework/statemachine/support/AbstractStateMachine.java

@@ -177,6 +177,11 @@ public abstract class AbstractStateMachine<S, E> extends LifecycleObjectSupport
 		return initialState;
 	}
 
+	@Override
+	public ExtendedState getExtendedState() {
+		return extendedState;
+	}
+
 	@Override
 	public boolean sendEvent(Message<E> event) {
 		if (isComplete() || !isRunning()) {

spring-statemachine-samples/src/main/java/demo/AbstractStateMachineCommands.java

@@ -1,5 +1,9 @@
 package demo;
 
+import java.util.Iterator;
+import java.util.Map.Entry;
+import java.util.Set;
+
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.factory.annotation.Qualifier;
 import org.springframework.shell.core.CommandMarker;
@@ -22,7 +26,7 @@ public class AbstractStateMachineCommands<S, E> implements CommandMarker {
 	@Qualifier("stateChartModel")
 	private String stateChartModel;
 
-	@CliCommand(value = "sm state", help = "Prints state machine state")
+	@CliCommand(value = "sm state", help = "Prints current state")
 	public String state() {
 		return StringUtils.collectionToCommaDelimitedString(stateMachine.getState().getIds());
 	}
@@ -44,4 +48,23 @@ public class AbstractStateMachineCommands<S, E> implements CommandMarker {
 		return stateChartModel;
 	}
 
+	@CliCommand(value = "sm variables", help = "Prints extended state variables")
+	public String variables() {
+		StringBuilder buf = new StringBuilder();
+		Set<Entry<Object, Object>> entrySet = stateMachine.getExtendedState().getVariables().entrySet();
+		Iterator<Entry<Object, Object>> iterator = entrySet.iterator();
+		if (entrySet.size() > 0) {
+			while (iterator.hasNext()) {
+				Entry<Object, Object> e = iterator.next();
+				buf.append(e.getKey() + "=" + e.getValue());
+				if (iterator.hasNext()) {
+					buf.append("\n");
+				}
+			}
+		} else {
+			buf.append("No variables");
+		}
+		return buf.toString();
+	}
+
 }