package dk.itu.oop.lecture5;

public abstract class FilterIterator2 implements OOPIterator {
	private OOPIterator inIterator;
	private Object nextElement;
	protected abstract boolean condition(Object obj);

	public FilterIterator2(OOPIterator in){
		inIterator = in;
	}

	protected void findNext(){
		while (inIterator.hasNext() ){
			nextElement = inIterator.next();
			if ( condition(nextElement) )
				return;
		}
		nextElement = null;
	}

	public boolean hasNext(){
		return nextElement != null;
	}

	public Object next(){
		Object returnMe = nextElement;
		findNext();
		return returnMe;
	}

	public Object peek(){
		return nextElement;
	}

	public OOPIterator cloneMe(){
		try{
			FilterIterator2 clone =  (FilterIterator2)super.clone();
			clone.inIterator = inIterator.cloneMe();
			return clone;
		}catch(CloneNotSupportedException shouldNotHappen){
			throw new Error("Object claims not to be able to clone");
		}
	}
}