NavigationCommand.as

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import gugga.application.ApplicatiotionNavigationalStateMemento;
import gugga.common.ICommand;
import gugga.commands.INavigationCommandReceiver;

class gugga.commands.NavigationCommand 
        implements ICommand 
{
        private var mReceiver:INavigationCommandReceiver;
        private var mPreviousState:ApplicatiotionNavigationalStateMemento;
        private var mNavigateTo:String;
        
        public function NavigationCommand(aNavigateTo:String)
        {
                mReceiver = INavigationCommandReceiver(_global.ApplicationController);
                mNavigateTo = aNavigateTo;
        }

        public function execute() : Boolean 
        {
                mPreviousState =  mReceiver.createNavigationState();
                return mReceiver.navigateTo(mNavigateTo);
        }

        public function isReversible() : Boolean 
        {
                return true;
        }

        public function undo() : Void 
        {
                mReceiver.setNavigationState(mPreviousState);
        }
        
        public function clone():ICommand
        {
                var  copy:NavigationCommand =  new NavigationCommand(this.mNavigateTo);
                
                copy.mNavigateTo = this.mNavigateTo;
                copy.mPreviousState = this.mPreviousState;
//              copy.mApplication = this.mApplication;
                copy.mReceiver = this.mReceiver;
                return copy; 
        }
}

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