make a cursor iterable for foreach

import android.database.Cursor;
import java.util.Iterator;
import java.util.NoSuchElementException;

public class CursorI implements Iterable<Cursor> {
    Cursor cursor;
    class IteratorI implements Iterator<Cursor> {
        Cursor cursor;
        IteratorI(Cursor cursor) {
            this.cursor = cursor;
        }
        public boolean hasNext() {
            if (cursor == null)
                return false;
            boolean ret = cursor.moveToNext();
            if (!ret) {
                cursor.close();
                cursor = null;
            }
            return ret;
        }
        public Cursor next() {
            return cursor;
        }
        public void remove() {
            throw new UnsupportedOperationException("can't remove from cursors");
        }
    }

    public CursorI(Cursor cursor) {
        this.cursor = cursor;
    }

    public IteratorI iterator() {
        IteratorI ret = new IteratorI(cursor);
        cursor = null; // make sure it's used once only
        return ret;
    }

    /*
    * short sample on how to use the above code. the foreach will work, if a
    * cursor is wrapped into a CursorI as shown below.
    */
    static void test(Cursor cursor) {
        for (Cursor o: new CursorI(cursor)) {
            ; // do something with the row
        }
    }
}