PropertySetter

/*
    CASA Lib for ActionScript 3.0
    Copyright (c) 2011, Aaron Clinger & Contributors of CASA Lib
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*/
package org.casalib.util {
    
    
    /**
        Creates a setter function for properties. Designed to be used with objects where methods require a function but you want to ultimately set a value of a property.
        
        @author Aaron Clinger
        @author Mike Creighton
        @author David Nelson
        @version 02/13/10
    */
    public class PropertySetter {
        protected var _scope:Object;
        protected var _property:String;
        protected var _argument:int;
        
        
        /**
            Defines the property you wish to define with {@link #defineProperty}.
            
            @param scope: An object that contains the property specified by property.
            @param property: Name of the property you want to assign the value of.
            @param argument: The position the value to assign falls in the argument order.
            @throws Error if the property does not exist or is not available in defined scope.
        */
        public function PropertySetter(scope:Object, property:String, argument:uint = 0) {
            if (scope[property] == undefined)
                throw new Error('Property "' + property + '" does not exist or is not available in defined scope.');
            
            this._scope    = scope;
            this._property = property;
            this._argument = argument;
        }
        
        /**
            Defines property with the value of the targeted argument.
        */
        public function defineProperty(...arguments):void {
            this._scope[this._property] = arguments[this._argument];
        }
    }
}