Allow the BodyObject to play along when we enter and leave a place.

git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@5108 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/java/com/threerings/crowd/data/BodyObject.java

@@ -129,11 +129,34 @@ public class BodyObject extends ClientObject
      * Creates a blank occupant info instance that will used to publish information about the
      * various bodies occupying a place.
      */
-    public OccupantInfo createOccupantInfo (PlaceObject placeObject)
+    public OccupantInfo createOccupantInfo (PlaceObject plobj)
     {
         return new OccupantInfo(this);
     }
 
+    /**
+     * Called when this body is about to enter the specified place. Configures our {@link
+     * #location} field.
+     *
+     * @param place the identifying information for the place we are entering.
+     * @param plobj the distributed object for the place we are entering.
+     */
+    public void willEnterPlace (Place place, PlaceObject plobj)
+    {
+        setLocation(place);
+    }
+
+    /**
+     * Called when this body has left its occupied place. Clears our {@link #location} field.
+     *
+     * @param plobj the distributed object for the place we just departed. This might be null if
+     * the place object has been destroyed.
+     */
+    public void didLeavePlace (PlaceObject plobj)
+    {
+        setLocation(null);
+    }
+
     // documentation inherited
     public void applyToListeners (ListenerOp op)
     {

src/java/com/threerings/crowd/server/LocationProvider.java

@@ -144,7 +144,7 @@ public class LocationProvider
                     pmgr.buildOccupantInfo(source);
 
                     // set the body's new location
-                    source.setLocation(place);
+                    source.willEnterPlace(place, plobj);
 
                     // add the body oid to the place object's occupant list
                     plobj.addToOccupants(bodoid);
@@ -179,19 +179,20 @@ public class LocationProvider
         }
 
         // remove them from the occupant list
+        PlaceObject plobj = null;
         try {
-            PlaceObject pold = (PlaceObject)_omgr.getObject(oldloc.placeOid);
-            if (pold != null) {
+            plobj = (PlaceObject)_omgr.getObject(oldloc.placeOid);
+            if (plobj != null) {
                 Integer key = Integer.valueOf(bodoid);
-                pold.startTransaction();
+                plobj.startTransaction();
                 try {
                     // remove their occupant info (which is keyed on oid)
-                    pold.removeFromOccupantInfo(key);
+                    plobj.removeFromOccupantInfo(key);
                     // and remove them from the occupant list
-                    pold.removeFromOccupants(bodoid);
+                    plobj.removeFromOccupants(bodoid);
 
                 } finally {
-                    pold.commitTransaction();
+                    plobj.commitTransaction();
                 }
 
             } else {
@@ -205,7 +206,7 @@ public class LocationProvider
         }
 
         // clear out their location
-        source.setLocation(null);
+        source.didLeavePlace(plobj);
     }
 
     /**