First draft of event handling using javascript

scripts/bukkit/events.js

@@ -0,0 +1,69 @@
+var global = this;
+//
+// Usage:
+//
+//  The following code will print a message on screen every time a block is broken in the game
+//
+//    bukkit.on('block.BlockBreakEvent',function(evt){ 
+//        print (evt.player.name + " broke a block!");
+//    });
+// 
+var bukkit = bukkit || {
+    //
+    // handle events in Minecraft
+    // --------------------------
+    // eventType can be a string (assumed to be a sub package of org.bukkit.event - e.g. 
+    // if the string "block.BlockBreakEvent" is supplied then it's converted to the 
+    // org.bukkit.event.block.BlockBreakEvent class . For custom event classes, just 
+    // supply the custom event class e.g.
+    // bukkit.on(net.yourdomain.events.YourCustomEvent,function(e){ ... });
+    //
+    on: function(
+        /* String or java Class */ eventType, 
+        /* function */ handler, 
+        /* (optional) String (HIGH, HIGHEST, LOW, LOWEST, NORMAL, MONITOR), */ priority
+    ){}
+};
+//
+// private implementation from here on in...
+//
+(function(){
+    if (bukkit._eventsLoaded){
+        return;
+    }
+    var _event = org.bukkit.event;
+    var _plugin = org.bukkit.plugin;
+    var theListener = new _event.Listener(){};
+
+    //
+    var _on = function(eventType, handler, priority)
+    {
+        if (typeof priority == "undefined"){
+            priority = _event.EventPriority.NORMAL;
+        }else{
+            priority = _event.EventPriority[priority];
+        }
+        if (typeof eventType == "string"){
+            var subPkgs = eventType.split('.');
+            eventType = _event[subPkgs[0]];
+            for (var i = 1;i < subPkgs.length; i++){
+                eventType = eventType[subPkgs[i]];
+            }
+        }
+        var handlerList = eventType.getHandlerList();
+        var handlerWrapper = {
+            execute: function(l,e){
+                // drop listener
+                handler(e);
+            } 
+        };
+        var registeredListener = new _plugin.RegisteredListener(theListener,
+                                                                handlerWrapper,
+                                                                priority,
+                                                                plugin,
+                                                                true);
+        handlerList.register(registeredListener);
+    };
+    bukkit.on = _on;
+    bukkit._eventsLoaded = true;
+}());