01: package net.sourceforge.squirrel_sql.fw.util;
02:
03: /*
04: * Copyright (C) 2001-2002 Colin Bell
05: * colbell@users.sourceforge.net
06: *
07: * This library is free software; you can redistribute it and/or
08: * modify it under the terms of the GNU Lesser General Public
09: * License as published by the Free Software Foundation; either
10: * version 2.1 of the License, or (at your option) any later version.
11: *
12: * This library is distributed in the hope that it will be useful,
13: * but WITHOUT ANY WARRANTY; without even the implied warranty of
14: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15: * Lesser General Public License for more details.
16: *
17: * You should have received a copy of the GNU Lesser General Public
18: * License along with this library; if not, write to the Free Software
19: * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20: */
21: import java.util.Iterator;
22: import java.util.NoSuchElementException;
23:
24: /**
25: * This represents an iterator that is over an empty container.
26: *
27: * @author <A HREF="mailto:colbell@users.sourceforge.net">Colin Bell</A>
28: */
29: public class EmptyIterator<E> implements Iterator<E> {
30: /**
31: * Returns <CODE>false</CODE> as container is empty.
32: */
33: public boolean hasNext() {
34: return false;
35: }
36:
37: /**
38: * Throws <CODE>NoSuchElementException</CODE> as container is empty.
39: */
40: public E next() {
41: throw new NoSuchElementException();
42: }
43:
44: /**
45: * Throws <CODE>IllegalStateException</CODE> as container is empty.
46: */
47: public void remove() {
48: throw new IllegalStateException();
49: }
50: }
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