[Major] Added StrolchPolicy.undo()

- and from now on we don't use interfaces anymore. We use abstract
classes with StrolchPolicy as the super class.
- it would be lovely if Java would get rid of interfaces and abstract
classes. We only need one: abstract classes.

li.strolch.agent/src/main/java/li/strolch/policy/StrolchPolicy.java

@@ -73,4 +73,9 @@ public abstract class StrolchPolicy {
 	protected StrolchTransaction tx() {
 		return this.tx;
 	}
+
+	/**
+	 * @see Command#undo()
+	 */
+	protected abstract void undo();
 }

li.strolch.agent/src/test/java/li/strolch/policytest/TestConfirmationPolicy.java

@@ -15,12 +15,19 @@
  */
 package li.strolch.policytest;
 
+import li.strolch.agent.api.ComponentContainer;
 import li.strolch.model.activity.Action;
+import li.strolch.persistence.api.StrolchTransaction;
+import li.strolch.policy.StrolchPolicy;
 
 /**
  * @author Robert von Burg <eitch@eitchnet.ch>
  */
-public interface TestConfirmationPolicy {
+public abstract class TestConfirmationPolicy extends StrolchPolicy {
 
-	public void confirm(Action action);
+	public TestConfirmationPolicy(ComponentContainer container, StrolchTransaction tx) {
+		super(container, tx);
+	}
+
+	public abstract void confirm(Action action);
 }

li.strolch.agent/src/test/java/li/strolch/policytest/TestExecutionPolicy.java

@@ -15,12 +15,19 @@
  */
 package li.strolch.policytest;
 
+import li.strolch.agent.api.ComponentContainer;
 import li.strolch.model.activity.Action;
+import li.strolch.persistence.api.StrolchTransaction;
+import li.strolch.policy.StrolchPolicy;
 
 /**
  * @author Robert von Burg <eitch@eitchnet.ch>
  */
-public interface TestExecutionPolicy {
+public abstract class TestExecutionPolicy extends StrolchPolicy {
 
-	public void execute(Action action);
+	public TestExecutionPolicy(ComponentContainer container, StrolchTransaction tx) {
+		super(container, tx);
+	}
+
+	public abstract void execute(Action action);
 }

li.strolch.agent/src/test/java/li/strolch/policytest/TestNoConfirmationPolicy.java

@@ -19,12 +19,11 @@ import li.strolch.agent.api.ComponentContainer;
 import li.strolch.model.State;
 import li.strolch.model.activity.Action;
 import li.strolch.persistence.api.StrolchTransaction;
-import li.strolch.policy.StrolchPolicy;
 
 /**
  * @author Robert von Burg <eitch@eitchnet.ch>
  */
-public class TestNoConfirmationPolicy extends StrolchPolicy implements TestConfirmationPolicy {
+public class TestNoConfirmationPolicy extends TestConfirmationPolicy {
 
 	public TestNoConfirmationPolicy(ComponentContainer container, StrolchTransaction tx) {
 		super(container, tx);
@@ -34,4 +33,9 @@ public class TestNoConfirmationPolicy extends StrolchPolicy implements TestConfi
 	public void confirm(Action action) {
 		action.setState(State.CLOSED);
 	}
+
+	@Override
+	protected void undo() {
+		// do nothing
+	}
 }

li.strolch.agent/src/test/java/li/strolch/policytest/TestPlanningPolicy.java

@@ -15,12 +15,19 @@
  */
 package li.strolch.policytest;
 
+import li.strolch.agent.api.ComponentContainer;
 import li.strolch.model.activity.Action;
+import li.strolch.persistence.api.StrolchTransaction;
+import li.strolch.policy.StrolchPolicy;
 
 /**
  * @author Robert von Burg <eitch@eitchnet.ch>
  */
-public interface TestPlanningPolicy {
+public abstract class TestPlanningPolicy extends StrolchPolicy {
 
-	public void plan(Action action);
+	public TestPlanningPolicy(ComponentContainer container, StrolchTransaction tx) {
+		super(container, tx);
+	}
+
+	public abstract void plan(Action action);
 }

li.strolch.agent/src/test/java/li/strolch/policytest/TestSimplePlanningPolicy.java

@@ -19,12 +19,11 @@ import li.strolch.agent.api.ComponentContainer;
 import li.strolch.model.State;
 import li.strolch.model.activity.Action;
 import li.strolch.persistence.api.StrolchTransaction;
-import li.strolch.policy.StrolchPolicy;
 
 /**
  * @author Robert von Burg <eitch@eitchnet.ch>
  */
-public class TestSimplePlanningPolicy extends StrolchPolicy implements TestPlanningPolicy {
+public class TestSimplePlanningPolicy extends TestPlanningPolicy {
 
 	public TestSimplePlanningPolicy(ComponentContainer container, StrolchTransaction tx) {
 		super(container, tx);
@@ -34,4 +33,9 @@ public class TestSimplePlanningPolicy extends StrolchPolicy implements TestPlann
 	public void plan(Action action) {
 		action.setState(State.PLANNED);
 	}
+
+	@Override
+	protected void undo() {
+		// do nothing
+	}
 }

li.strolch.agent/src/test/java/li/strolch/policytest/TestSimulatedExecutionPolicy.java

@@ -19,12 +19,11 @@ import li.strolch.agent.api.ComponentContainer;
 import li.strolch.model.State;
 import li.strolch.model.activity.Action;
 import li.strolch.persistence.api.StrolchTransaction;
-import li.strolch.policy.StrolchPolicy;
 
 /**
  * @author Robert von Burg <eitch@eitchnet.ch>
  */
-public class TestSimulatedExecutionPolicy extends StrolchPolicy implements TestExecutionPolicy {
+public class TestSimulatedExecutionPolicy extends TestExecutionPolicy {
 
 	public TestSimulatedExecutionPolicy(ComponentContainer container, StrolchTransaction tx) {
 		super(container, tx);
@@ -34,4 +33,9 @@ public class TestSimulatedExecutionPolicy extends StrolchPolicy implements TestE
 	public void execute(Action action) {
 		action.setState(State.EXECUTION);
 	}
+
+	@Override
+	protected void undo() {
+		// do nothing
+	}
 }