1 /* AcceptRule
2 *
3 * $Id: PredicatedDecideRule.java 4914 2007-02-18 21:53:01Z gojomo $
4 *
5 * Created on Mar 3, 2005
6 *
7 * Copyright (C) 2005 Internet Archive.
8 *
9 * This file is part of the Heritrix web crawler (crawler.archive.org).
10 *
11 * Heritrix is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU Lesser Public License as published by
13 * the Free Software Foundation; either version 2.1 of the License, or
14 * any later version.
15 *
16 * Heritrix is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU Lesser Public License for more details.
20 *
21 * You should have received a copy of the GNU Lesser Public License
22 * along with Heritrix; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 */
25 package org.archive.crawler.deciderules;
26
27 /***
28 * Rule which applies the configured decision only if a
29 * test evaluates to true. Subclasses override evaluate()
30 * to establish the test.
31 *
32 * @author gojomo
33 */
34 public abstract class PredicatedDecideRule extends ConfiguredDecideRule {
35 public PredicatedDecideRule(String name) {
36 super(name);
37 setDescription("ABSTRACT: Should not appear as choice.");
38 }
39
40 public Object decisionFor(Object object) {
41 if(evaluate(object)) {
42 return super.decisionFor(object);
43 }
44 return PASS;
45 }
46
47 protected abstract boolean evaluate(Object object);
48 }