var Class = require('../../utils/Class'); 
var ObjectPool = new Class({ 
initialize: function ObjectPool(manager, classType, maxSize, createCallback, callbackScope){ 
if (maxSize === undefined) { 
maxSize = -1; 
} 
if (createCallback === undefined) { 
createCallback = this.makeGameObject; 
} 
if (callbackScope === undefined) { 
callbackScope = this; 
} 
this.manager = manager; 
this.scene = manager.scene; 
this.displayList = this.scene.sys.displayList; 
this.updateList = this.scene.sys.updateList; 
this.createCallback = createCallback; 
this.callbackScope = callbackScope; 
this.maxSize = maxSize; 
this.classType = classType; 
this._list = [] ; 
} 
,
makeGameObject: function (){ 
var gameObject = new this.classType(this.scene); 
this.displayList.add(gameObject); 
gameObject.setActive(false ); 
gameObject.setVisible(false ); 
return gameObject; 
} 
,
add: function (child){ 
var children; 
if (Array.isArray(child)) { 
children = child; 
} 
 else if (child.hasOwnProperty('children')) { 
children = child.children.getArray(); 
} 
 else { 
children = [child] ; 
} 
var len = _AN_Read_length('length', children); 
if (this.maxSize > -1) { 
var free = this.maxSize - _AN_Read_length('length', this._list); 
if (len > free) { 
len = free; 
} 
} 
for (var i = 0; 
i < len; i++ ){ 
this._list.push(children[i]); 
} 
return this; 
} 
,
create: function (quantity){ 
for (var i = 0; 
i < quantity; i++ ){ 
if (!this.isFull()) { 
this._list.push(this.createCallback.call(this.callbackScope)); 
} 
} 
return this; 
} 
,
get: function (){ 
return this.getFreeGameObject(); 
} 
,
getFreeGameObject: function (){ 
var gameObject; 
for (var i = 0; 
i < (_AN_Read_length('length', this._list)); i++ ){ 
gameObject = this._list[i]; 
if (!gameObject.active) { 
gameObject.setActive(true ); 
gameObject.setVisible(true ); 
return gameObject; 
} 
} 
if (!this.isFull()) { 
gameObject = this.createCallback.call(this.callbackScope); 
gameObject.setActive(true ); 
gameObject.setVisible(true ); 
this._list.push(gameObject); 
return gameObject; 
} 
return null ; 
} 
,
kill: function (gameObject){ 
if (this._list.indexOf(gameObject) > -1) { 
gameObject.setActive(false ); 
} 
} 
,
killAndHide: function (gameObject){ 
if (this._list.indexOf(gameObject) > -1) { 
gameObject.setActive(false ); 
gameObject.setVisible(false ); 
} 
} 
,
purge: function (destroyChildren){ 
if (destroyChildren === undefined) { 
destroyChildren = true ; 
} 
if (destroyChildren) { 
for (var i = 0; 
i < (_AN_Read_length('length', this._list)); i++ ){ 
this._list[i].destroy(); 
} 
} 
this._list.length = 0; 
} 
,
isFull: function (){ 
if (this.maxSize === -1) { 
return false ; 
} 
 else { 
return ((_AN_Read_length('length', this._list)) === this.maxSize); 
} 
} 
,
update: function (time, delta){ 
for (var i = 0; 
i < (_AN_Read_length('length', this._list)); i++ ){ 
var gameObject = this._list[i]; 
if (gameObject.active) { 
gameObject.update(time, delta); 
} 
} 
} 
,
getTotalUsed: function (){ 
var total = 0; 
for (var i = 0; 
i < (_AN_Read_length('length', this._list)); i++ ){ 
if (this._list[i].active) { 
total++ ; 
} 
} 
return total; 
} 
,
getTotalFree: function (){ 
var used = this.getTotalUsed(); 
var capacity = (this.maxSize === -1)? 999999999999: this.maxSize; 
return (capacity - used); 
} 
,
destroy: function (){ 
this.manager = undefined; 
this.scene = undefined; 
this.displayList = undefined; 
this.updateList = undefined; 
this.createCallback = undefined; 
this.callbackScope = undefined; 
this._list.length = 0; 
} 
}
); 
module.exports = ObjectPool;