1 /* Copyright (C) 2003 Internet Archive.
2 *
3 * This file is part of the Heritrix web crawler (crawler.archive.org).
4 *
5 * Heritrix is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU Lesser Public License as published by
7 * the Free Software Foundation; either version 2.1 of the License, or
8 * any later version.
9 *
10 * Heritrix is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU Lesser Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser Public License
16 * along with Heritrix; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 *
19 * Inverter.java
20 * Created on May 21, 2004
21 *
22 * $Header$
23 */
24 package org.archive.util;
25
26 import org.apache.commons.collections.Predicate;
27
28
29 /***
30 * A predicate that inverts another.
31 * @author gojomo
32 */
33 public class Inverter implements Predicate {
34 Predicate innerPredicate;
35
36 public Inverter(Predicate p) {
37 super();
38 this.innerPredicate = p;
39 }
40
41 public boolean evaluate(Object arg0) {
42 return !innerPredicate.evaluate(arg0);
43 }
44 }