package dk.itu.oop.lecture5;
class WordIterator implements OOPIterator{
	// inv: if I=N, the iterator is empty
	//      else i points to the index if the start of the head word
	final String str;
	final int N;
	int i;
	String nextWord;
	WordIterator(String str){
		this.str= str;
		i=0;
		N = str.length();
		findNext();
	}
	private void findNext(){
		while( i<N && !Character.isLetter(str.charAt(i)) )
			i++;
		StringBuffer b = new StringBuffer();
		while( i<N && Character.isLetter(str.charAt(i)) ){
			b.append( str.charAt(i) );
			i++;
		}
		nextWord = b.toString();
	}

	public boolean hasNext(){
		return nextWord.length()>0;
	}

	public String peek(){
		return nextWord;
	}

	public String next(){
		String ret = peek();
		findNext();
		return ret;
	}

	public OOPIterator cloneMe(){
		try{
			return super.clone();
		}catch(Exception shouldNotHappen){
		}
	}
}