scriptcraft/js-plugins/events/events.js

var global = this;
//
// Usage:
//
//  The following code will print a message on screen every time a block is broken in the game
//
//    events.on("block.BlockBreakEvent", function(listener, evt){ 
//        print (evt.player.name + " broke a block!");
//    });
//
//  To handle an event only once and unregister from further events...
//    
//    events.on("block.BlockBreakEvent", function(listener, evt){ 
//        print (evt.player.name + " broke a block!");
//        evt.handlers.unregister(listener);
//    });
// 
var events = events || {
    //
    // 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.
    // events.on(net.yourdomain.events.YourCustomEvent,function(l,e){ ... });
    //
    on: function(
        /* String or java Class */ eventType, 
        /* function( registeredListener, event) */ handler, 
        /* (optional) String (HIGH, HIGHEST, LOW, LOWEST, NORMAL, MONITOR), */ priority
    ){}
};
//
// private implementation from here on in...
//
(function(){
    if (events._eventsLoaded){
        return;
    }
    var _event = org.bukkit.event;
    var _plugin = org.bukkit.plugin;
    // 
    // can't have objects that implement multiple interface in javax.scripts.* 
    //
    var theListener = new _event.Listener(){};

    var _on = function(eventType, handler, priority)
    {
        if (typeof priority == "undefined"){
            priority = _event.EventPriority.HIGHEST;
        }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 listener = {};
        var eventExecutor = new _plugin.EventExecutor(){
            execute: function(l,e){
                handler(listener.reg,e);
            } 
        };
        listener.reg = new _plugin.RegisteredListener(
            theListener,eventExecutor,priority,__plugin,true
        )
        handlerList.register(listener.reg);
        return listener.reg;
    };
    events.on = _on;
    events._eventsLoaded = true;
}());