CODEWITHSUNDEEP
actionscript-3vector
Ilya Gazman
Ilya Gazman

Reputation: 32221

AS3: Casting to Vector

I am trying to create a vector from unknown class, but it fails, any ideas about how to do it?

This is what i tried:

var vector:Vector = new Vector(); // throw exception

function base():void{
var vector:Vector.<String> = createVector(String);// throw classCastException
}

function createVector(cls:Class):*{
     var array:Array = new Array();
     for(var i:int = 0; i < 10; i++){
         var element:cls = new cls();
          array.push(element);
     }

     return Vector(array);
}

Upvotes: 0

Views: 1096

Answers (2)

Ilya Gazman
Ilya Gazman

Reputation: 32221

Based on @Patrick answer I found a working solution.

Check it out:

function createVector(cls:Class):*{
        var className:String = getQualifiedClassName(cls);
        var vectorClass:Class = getDefinitionByName("__AS3__.vec::Vector.<"+className+">") as Class;

        var vector:* = new vectorClass(10);        
        for(var i:int = 0; i < 10; i++){
            var element:MyClass = new cls(); // may be Object or Object extends cls
            vector[i] = element;
        }

        return vector;
    }

Upvotes: 1

Patrick
Patrick

Reputation: 15717

Vector is expecting a parameter type so you can't do this like you want, but using getQualifiedClassName to get class info you can construct a string that will enable you to call the Vector. constructor using getDefinitionByName :

Ex.

// get class parameter name
var className:String=getQualifiedClassName(String);

// get the Vector class object for the given class
var o:Object=getDefinitionByName("__AS3__.vec::Vector<"+className+">");

// call the constructor
var v:*=o.prototype.constructor(["hello", "world"]);

So your function can be written as:

    public function createVector(cls:Class):*{
        var cn:String = getQualifiedClassName(cls);
        var o:Object = getDefinitionByName("__AS3__.vec::Vector.<"+cn+">");
        var array:Array = [];
        for(var i:int = 0; i < 10; i++){
            var element:* = new cls();
            array.push(element);
        }
        return o.prototype.constructor(array);
    }

live example at wonderfl: http://wonderfl.net/c/pkjs

Upvotes: 2

Related Questions