Phaser.LinkedList = function (){ 
this.next = null ; 
this.prev = null ; 
this.first = null ; 
this.last = null ; 
this.total = 0; 
} 
; 
Phaser.LinkedList.prototype = { 
add: function (item){ 
if (this.total === 0 && this.first === null  && this.last === null ) { 
this.first = item; 
this.last = item; 
this.next = item; 
item.prev = this; 
this.total++ ; 
return item; 
} 
this.last.next = item; 
item.prev = this.last; 
this.last = item; 
this.total++ ; 
return item; 
} 
,
reset: function (){ 
this.first = null ; 
this.last = null ; 
this.next = null ; 
this.prev = null ; 
this.total = 0; 
} 
,
remove: function (item){ 
if (this.total === 1) { 
this.reset(); 
item.next = item.prev = null ; 
return ; 
} 
if (item === this.first) { 
this.first = this.first.next; 
} 
 else if (item === this.last) { 
this.last = this.last.prev; 
} 
if (item.prev) { 
item.prev.next = item.next; 
} 
if (item.next) { 
item.next.prev = item.prev; 
} 
item.next = item.prev = null ; 
if (this.first === null ) { 
this.last = null ; 
} 
this.total-- ; 
} 
,
callAll: function (callback){ 
if (!this.first || !this.last) { 
return ; 
} 
var entity = this.first; 
do { 
if (entity && entity[callback]) { 
entity[callback].call(entity); 
} 
entity = entity.next; 
} 
while(entity != this.last.next)} 
}
; 
Phaser.LinkedList.prototype.constructor = Phaser.LinkedList;