package dk.itu.oop.lecture5;

public class CharacterIterator implements OOPIterator {
	private String str;
	private int index;
	private final int N;

	// inv: index < N implies str.charAt(index) is head,
	//      index = N if and only if hasMore is true

	public CharacterIterator(String str){
		this.str = str;
		N = str.length();
		index = 0;
	}

	public boolean hasNext(){
		return index<N;
	}

	public Object peek(){
		return new Character( str.charAt( index ) );
	}

	public Object next(){
		return new Character( str.charAt( index++ ) );
	}

	public OOPIterator cloneMe(){
		try{
			return (OOPIterator)super.clone();
		}catch(CloneNotSupportedException e){
			return null;
		}
	}

	public static void main(String[] args){
		String haddock = "You #!@ Miserable earthworms! Numbskulls! and Carpet-sellers!";
		OOPIterator itr = new CharacterIterator( haddock );
		while (itr.hasNext())
			System.out.print( itr.next() );
		System.out.println();
	}
}