ArrayListIterator.as

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import gugga.collections.IIterator;
import gugga.debug.Assertion;
import gugga.collections.ArrayList;

class gugga.collections.ArrayListIterator implements IIterator 
{
        private var mArrayList : ArrayList;
        private var mCurrent : Number;
        private var mIsValid : Boolean;
        public function get IsValid() : Boolean { return mIsValid; }
        
        public function ArrayListIterator(aArrayList : ArrayList)
        {
                mArrayList = aArrayList;
                reset();
        }
        
        public function reset()  : Void
        {
                mCurrent = -1;
                mIsValid = false;       
        }

        public function iterate() : Boolean 
        {
                mCurrent++;
                
                mIsValid = !(mArrayList[mCurrent] == null || mArrayList[mCurrent] == undefined);
                
                return mIsValid;
        }

        public function current() : Object 
        {
                Assertion.failIfFalse(
                                mIsValid, 
                                "There is no valid value of the current item for index " + mCurrent, this, arguments);
                                
                return mArrayList[mCurrent];
        }
        
        public function get Current() : Object 
        {
                return current();
        }
        
        public function clone () : IIterator
        {
                return new ArrayListIterator(mArrayList.clone());
        }
}

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