/*
Copyright (c) 2010, Yahoo! Inc. All rights reserved.
Code licensed under the BSD License:
http://developer.yahoo.com/yui/license.html
version: 3.2.0
build: nightly
*/
YUI.add("async-queue",function(G){G.AsyncQueue=function(){this._init();this.add.apply(this,arguments);};var E=G.AsyncQueue,C="execute",B="shift",D="promote",H="remove",A=G.Lang.isObject,F=G.Lang.isFunction;E.defaults=G.mix({autoContinue:true,iterations:1,timeout:10,until:function(){this.iterations|=0;return this.iterations<=0;}},G.config.queueDefaults||{});G.extend(E,G.EventTarget,{_running:false,_init:function(){G.EventTarget.call(this,{emitFacade:true});this._q=[];this.defaults={};this._initEvents();},_initEvents:function(){this.publish({"execute":{defaultFn:this._defExecFn,emitFacade:true},"shift":{defaultFn:this._defShiftFn,emitFacade:true},"add":{defaultFn:this._defAddFn,emitFacade:true},"promote":{defaultFn:this._defPromoteFn,emitFacade:true},"remove":{defaultFn:this._defRemoveFn,emitFacade:true}});},next:function(){var I;while(this._q.length){I=this._q[0]=this._prepare(this._q[0]);if(I&&I.until()){this.fire(B,{callback:I});I=null;}else{break;}}return I||null;},_defShiftFn:function(I){if(this.indexOf(I.callback)===0){this._q.shift();}},_prepare:function(K){if(F(K)&&K._prepared){return K;}var I=G.merge(E.defaults,{context:this,args:[],_prepared:true},this.defaults,(F(K)?{fn:K}:K)),J=G.bind(function(){if(!J._running){J.iterations--;}if(F(J.fn)){J.fn.apply(J.context||G,G.Array(J.args));}},this);return G.mix(J,I);},run:function(){var J,I=true;for(J=this.next();I&&J&&!this.isRunning();J=this.next()){I=(J.timeout<0)?this._execute(J):this._schedule(J);}if(!J){this.fire("complete");}return this;},_execute:function(J){this._running=J._running=true;J.iterations--;this.fire(C,{callback:J});var I=this._running&&J.autoContinue;this._running=J._running=false;return I;},_schedule:function(I){this._running=G.later(I.timeout,this,function(){if(this._execute(I)){this.run();}});return false;},isRunning:function(){return !!this._running;},_defExecFn:function(I){I.callback();},add:function(){this.fire("add",{callbacks:G.Array(arguments,0,true)});return this;},_defAddFn:function(J){var K=this._q,I=[];G.Array.each(J.callbacks,function(L){if(A(L)){K.push(L);I.push(L);}});J.added=I;},pause:function(){if(A(this._running)){this._running.cancel();}this._running=false;return this;},stop:function(){this._q=[];return this.pause();},indexOf:function(L){var J=0,I=this._q.length,K;for(;J<I;++J){K=this._q[J];if(K===L||K.id===L){return J;}}return -1;},getCallback:function(J){var I=this.indexOf(J);return(I>-1)?this._q[I]:null;},promote:function(K){var J={callback:K},I;if(this.isRunning()){I=this.after(B,function(){this.fire(D,J);I.detach();},this);}else{this.fire(D,J);}return this;},_defPromoteFn:function(K){var I=this.indexOf(K.callback),J=(I>-1)?this._q.splice(I,1)[0]:null;K.promoted=J;if(J){this._q.unshift(J);}},remove:function(K){var J={callback:K},I;if(this.isRunning()){I=this.after(B,function(){this.fire(H,J);I.detach();},this);}else{this.fire(H,J);}return this;},_defRemoveFn:function(J){var I=this.indexOf(J.callback);J.removed=(I>-1)?this._q.splice(I,1)[0]:null;},size:function(){if(!this.isRunning()){this.next();}return this._q.length;}});},"3.2.0",{requires:["event-custom"]});