Fix yohoho singleplayer NPE boochery caused by unsafe direct call on DObjectManager

git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@4636 542714f4-19e9-0310-aa3c-eee0fc999fb1

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

@@ -26,8 +26,11 @@ import java.util.Iterator;
 import com.threerings.util.Name;
 
 import com.threerings.presents.dobj.DObject;
+import com.threerings.presents.dobj.DObjectManager;
 import com.threerings.presents.dobj.DSet;
+import com.threerings.presents.dobj.MessageEvent;
 import com.threerings.presents.dobj.OidList;
+import com.threerings.presents.server.LocalDObjectMgr;
 
 import com.threerings.crowd.Log;
 import com.threerings.crowd.chat.data.SpeakMarshaller;
@@ -54,14 +57,33 @@ public class PlaceObject extends DObject
     // AUTO-GENERATED: FIELDS END
 
     /**
-     * Exists solely to make calls into the manager look sensible:
+     * Exists solely to make calls into the client's DObjManager look sensible:
      * <pre>_plobj.manager.invoke("someMethod", args);</pre>
      */
     public class ManagerCaller
     {
-        public void invoke (String method, Object ... args) {
-            postMessage(method, args);
+
+        public ManagerCaller ()
+        {
+            // Avoid NPE boochery if we're in singleplayer mode in yohoho:
+            // It turns out that GameController posts events directly to the queue
+            // of the DObjectManager of the GameObject, which is in this case the
+            // DObjectManager instead of the ClientDObjectMgr, so the sourceOid is
+            // unchanged, leading to the nasty problem of caller being null as the
+            // message was not actually received from any connected outside client.
+            DObjectManager clomgr = LocalDObjectMgr.clomgr;
+            if (clomgr != null) {
+                _mgr = clomgr;
+            } else {
+                _mgr = PlaceObject.this.getManager();
+            }
         }
+
+        public void invoke (String method, Object ... args) {
+            _mgr.postEvent(new MessageEvent(_oid, method, args));
+        }
+
+        protected DObjectManager _mgr;
     }
 
     /**