01: /* Copyright (C) 2003 Internet Archive.
02: *
03: * This file is part of the Heritrix web crawler (crawler.archive.org).
04: *
05: * Heritrix is free software; you can redistribute it and/or modify
06: * it under the terms of the GNU Lesser Public License as published by
07: * the Free Software Foundation; either version 2.1 of the License, or
08: * any later version.
09: *
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: * A predicate that inverts another.
30: * @author gojomo
31: */
32: public class Inverter implements Predicate {
33: Predicate innerPredicate;
34:
35: public Inverter(Predicate p) {
36: super ();
37: this .innerPredicate = p;
38: }
39:
40: public boolean evaluate(Object arg0) {
41: return !innerPredicate.evaluate(arg0);
42: }
43: }
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