JavaでRangeオブジェクト的ななにか

gistfile1.java

package util;

import java.io.Serializable;
import java.util.Iterator;

public class Range implements Iterable<Integer>, Serializable, Cloneable {
	
	private static class RangeIterator implements Iterator<Integer> {
		
		final int start;
		
		final int end;
		
		final int interval;
		
		int current;
		

		RangeIterator(int start, int end, int interval) {
			this.start = start;
			this.end = end;
			this.interval = interval;
			current = start;
		}
		
		@Override
		public boolean hasNext() {
			return current <= end;
		}
		
		@Override
		public Integer next() {
			final int ret = current;
			current += interval;
			return Integer.valueOf(ret);
		}
		
		@Override
		public void remove() {
			throw new UnsupportedOperationException("Not supported yet.");
		}
		
	}
	

	public static Range range(final int end) {
		return new Range(0, end, 1);
	}
	
	public static Range range(final int start, final int end) {
		return new Range(start, end, 1);
	}
	
	public static Range range(final int start, final int end, final int interval) {
		return new Range(start, end, interval);
	}
	

	private final int start;
	
	private final int end;
	
	private int interval;
	

	Range(final int start, final int end, final int interval) {
		this.start = start;
		this.end = end;
		this.interval = interval;
	}
	
	@Override
	protected Object clone() throws CloneNotSupportedException {
		return super.clone();
	}
	
	@Override
	public Iterator<Integer> iterator() {
		return new RangeIterator(start, end, interval);
	}
	
	public Range withInterval(final int interval) {
		try {
			Range clone = (Range) clone();
			clone.interval = interval;
			return clone;
		} catch (CloneNotSupportedException ex) {
			throw new RuntimeException(ex);
		}
	}
	
}