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Java > Open Source Codes > org > archive > util > Inverter


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: /cvsroot/archive-crawler/ArchiveOpenCrawler/src/java/org/archive/util/Inverter.java,v 1.3 2005/05/06 02:48:59 stack-sf Exp $
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 JavaDoc arg0) {
42         return !innerPredicate.evaluate(arg0);
43     }
44 }
45
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