var Class = require('../utils/Class'); 
var EventEmitter = require('eventemitter3'); 
var Data = new Class({ 
initialize: function Data(parent, eventEmitter){ 
this.parent = parent; 
this.events = (eventEmitter)? eventEmitter: new EventEmitter(); 
this.list = { 
}
; 
this._beforeCallbacks = { 
}
; 
this._afterCallbacks = { 
}
; 
this._frozen = false ; 
} 
,
get: function (key){ 
return this.list[key]; 
} 
,
getAll: function (){ 
var results = { 
}
; 
for (var key in this.list){ 
results[key] = this.list[key]; 
} 
return results; 
} 
,
query: function (search){ 
var results = { 
}
; 
for (var key in this.list){ 
if (key.match(search)) { 
results[key] = this.list[key]; 
} 
} 
return results; 
} 
,
set: function (key, data){ 
if (this._frozen) { 
return this; 
} 
var listener; 
var result; 
if (this._beforeCallbacks.hasOwnProperty(key)) { 
listener = this._beforeCallbacks[key]; 
result = listener.callback.call(listener.scope, this.parent, key, data); 
if (result !== undefined) { 
data = result; 
} 
} 
this.list[key] = data; 
if (this._afterCallbacks.hasOwnProperty(key)) { 
listener = this._afterCallbacks[key]; 
result = listener.callback.call(listener.scope, this.parent, key, data); 
if (result !== undefined) { 
this.list[key] = result; 
} 
} 
return this; 
} 
,
before: function (key, callback, scope){ 
if (callback === undefined) { 
delete this._beforeCallbacks[key]; 
} 
 else { 
this._beforeCallbacks[key] = { 
callback: callback,
scope: scope}
; 
} 
} 
,
after: function (key, callback, scope){ 
if (callback === undefined) { 
delete this._afterCallbacks[key]; 
} 
 else { 
this._afterCallbacks[key] = { 
callback: callback,
scope: scope}
; 
} 
} 
,
each: function (callback, scope){ 
var args = [this.parent, null , undefined] ; 
for (var i = 1; 
i < (_AN_Read_length('length', arguments)); i++ ){ 
args.push(arguments[i]); 
} 
for (var key in this.list){ 
args[1] = key; 
args[2] = this.list[key]; 
callback.apply(scope, args); 
} 
} 
,
merge: function (data, overwrite){ 
if (overwrite === undefined) { 
overwrite = true ; 
} 
for (var key in data){ 
if (overwrite || (!overwrite && !this.has(key))) { 
this.list[key] = data; 
} 
} 
} 
,
remove: function (key){ 
if (!this._frozen && this.has(key)) { 
delete this.list[key]; 
this.removeListeners(key); 
} 
} 
,
removeListeners: function (key){ 
if (this._beforeCallbacks.hasOwnProperty(key)) { 
delete this._beforeCallbacks[key]; 
} 
if (this._afterCallbacks.hasOwnProperty(key)) { 
delete this._afterCallbacks[key]; 
} 
} 
,
pop: function (key){ 
var data = undefined; 
if (!this._frozen && this.has(key)) { 
data = this.list[key]; 
delete this.list[key]; 
this.removeListeners(key); 
} 
return data; 
} 
,
has: function (key){ 
return this.list.hasOwnProperty(key); 
} 
,
reset: function (){ 
for (var key in this.list){ 
delete this.list[key]; 
} 
for (key in this._beforeCallbacks){ 
delete this._beforeCallbacks[key]; 
} 
for (key in this._afterCallbacks){ 
delete this._afterCallbacks[key]; 
} 
this._frozen = false ; 
} 
,
destroy: function (){ 
this.reset(); 
this.parent = null ; 
this.events = null ; 
} 
,
freeze: { 
get: function (){ 
return this._frozen; 
} 
,
set: function (value){ 
this._frozen = (value)? true : false ; 
} 
}
,
count: { 
get: function (){ 
var i = 0; 
for (var key in this.list){ 
if (this.list[key] !== undefined) { 
i++ ; 
} 
} 
return i; 
} 
}
}
); 
module.exports = Data;