package pgdp.iter;

import java.util.ArrayList;
import java.util.Iterator;

public class Range implements Iterable<Integer>{
	private final int begin;
	private final int end;
	private final int stride;

	public Range(int begin, int end, int stride) {
		this.begin = begin;
		this.end = end;
		this.stride = stride;
		if (stride <= 0) {
			Util.badArgument("Anzahl der Schritte soll größer 0 sein");
		}
	}

	public Range(int begin, int end) {
		this.begin = begin;
		this.end = end;
		stride = 1;
	}

	public Iterator<Integer> iterator() {
		ArrayList<Integer> list = new ArrayList<Integer>();
		if (begin == end)
			list.add(begin);
		if (begin < end) {
			list.add(begin);
			int addition = begin + stride;
			while (addition <= end) {
				list.add(addition);
				addition += stride;
			}
		} else {
			list.add(begin);
			int subtraction = begin - stride;
			while (subtraction >= end) {
				list.add(subtraction);
				subtraction -= stride;
			}
		}
		Iterator<Integer> iter = list.iterator();
		while (iter.hasNext())
			System.out.print(iter.next() + ", ");
		return iter;
	}

	public static void main(String[] args) {
		Range range = new Range(14, 24, 3);
		Iterator<Integer> iter = range.iterator();
	}
}