import nl.idgis.giclient.template.Parameterable;
import nl.idgis.giclient.template.ParameterSource;
import nl.idgis.giclient.template.CallbackCounter;
import mx.utils.Delegate;
/**
 * @author copierrj
 */
class nl.idgis.giclient.template.Parameter implements Parameterable {	
	private var name:String;
	private var appliedTo:Parameterable;
	private var source:ParameterSource;
	private var sourceName:String;
	
	private var subParameters:Array;
	private var subParameterValues:Object;
	
	private var callbackStack:Array;
	
	public function Parameter(name:String, appliedTo:Parameterable, source:ParameterSource, sourceName:String) {
		this.name = name;
		this.appliedTo = appliedTo;
		this.source = source;
		this.sourceName = sourceName;
		
		subParameters = new Array();
		subParameterValues = new Object();
		
		callbackStack = new Array();
	}
	
	public function addSubParameter(parameter:Parameter):Void {
		subParameters.push(parameter);
	}
	
	private function doGetValue() {
		source.getValue(this);
	}
	
	public function execute(callback:Function):Void {
		callbackStack.push(callback);
		
		if(subParameters.length > 0) {
			var callbackCounter:CallbackCounter = new CallbackCounter(subParameters.length,
				Delegate.create(this, doGetValue));
			
			for(var i:Number = 0;i < subParameters.length; i++) {
				Parameter(subParameters[i]).execute(callbackCounter.getCallback());
			}
		} else {		
			doGetValue();
		}
	}
	
	public function setValue(obj:Object) {
		var callback:Function = Function(callbackStack.pop());
		
		appliedTo.setParameter(name, obj);
		if(callback != null) {
			callback();
		}  
	}
	
	public function getSourceName():String {
		return sourceName;
	}
	
	public function getValue(name:String):Object {
		return subParameterValues[name];
	}
	
	public function setParameter(name : String, value : Object) : Void {
		subParameterValues[name] = value;
	}
}