diff --git a/bdi-jade/src/bdi4jade/plan/planbody/BeliefGoalPlanBody.java b/bdi-jade/src/bdi4jade/plan/planbody/BeliefGoalPlanBody.java
index 0dd368f..869e259 100644
--- a/bdi-jade/src/bdi4jade/plan/planbody/BeliefGoalPlanBody.java
+++ b/bdi-jade/src/bdi4jade/plan/planbody/BeliefGoalPlanBody.java
@@ -58,6 +58,14 @@ public abstract class BeliefGoalPlanBody extends AbstractPlanBody {
protected abstract void execute();
/**
+ * This method is a placeholder for subclasses. It is invoked by the
+ * {@link #onStart()} method, after it performs some pre-processing.
+ */
+ protected void init() {
+
+ }
+
+ /**
* Returns true if the goal of this plan body was achieved. If so, it sets
* the end state to successful, which cases this plan body to complete its
* execution.
@@ -79,9 +87,10 @@ public abstract class BeliefGoalPlanBody extends AbstractPlanBody {
* .
*/
@Override
- public void onStart() {
+ public final void onStart() {
if (!(getGoal() instanceof BeliefGoal))
throw new IllegalArgumentException("BeliefGoal expected.");
+ init();
}
}
