abstract_manager

var AbstractManager = Class.create({
  __element_class: '',
  __management_class: null,

  initialize: function(element){
    this.__instances = {};
    this.__selected_instance = null;
    this.__token = this.__element_class.replace('.','');
    this.register(element ? $(element).select(this.__element_class) : $$(this.__element_class));

    Object.extend(this, {
      rpcListener: function(e){
        var element = e.element();
        if( !element.hasClassName(this.__token) )
          element = element.up(this.__element_class);

        var key = element.id;
        var method = e.eventName.split(':').pop();
        if( $H(this.__instances).keys().include(key) ) this[method](key);
      }.bindAsEventListener(this)
    });

    document.observe(this.__token + ':set', this.rpcListener);
    document.observe(this.__token + ':clear', this.rpcListener);

    this.afterInitialize();
  },

  afterInitialize: function(){},

  destroy: function(){
    document.stopObserving(this.__token + ':set', this.rpcListener);
    document.stopObserving(this.__token + ':clear', this.rpcListener);
  },

  register: function(element){
    var _register = function(element){
      element = $(element);
      if( !element.id ) element.id = this.__token + '_' + String.random();
      return this.__instances[element.id] = new this.__management_class(element);
    }.bind(this);
    return Object.isArray(element) ? element.collect(_register) : _register(element);
  },

  get: function(key){
    if( key ){
      if( typeof key == 'object'){
        return this.__instances[$(key).up(this.__element_class).id];
      } else {
        return this.__instances[key];
      }
    } else {
      return this.__selected_instance;
    }
  },

  set: function(key){
    return this.__selected_instance = this.get(key);
  },

  clear: function(){
    this.__selected_instance = null;
  },

  send: function(method){
    var values = $H(this.__instances).values();
    if( values.length > 0 ) values.invoke(method);
  },

  setIds: function(){
    this.send('setIds');
  }
});