1 /*
2 * Created on 2006-aug-25
3 *
4 * Copyright (C) 2006 Royal Library of Sweden.
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public License
8 * as published by the Free Software Foundation; either version 2
9 * of the License, or (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19 */
20 package org.archive.crawler.url.canonicalize;
21
22 import java.util.regex.Matcher;
23 import java.util.regex.Pattern;
24
25 public class StripExtraSlashes extends BaseRule {
26
27 private static final String DESCRIPTION =
28 "Strip any extra slashes, '/', found in the path. " +
29 "Use this rule to equate 'http://www.archive.org//A//B/index.html' and " +
30 "'http://www.archive.org/A/B/index.html'.";
31
32 private static final Pattern REGEX = Pattern.compile("(^https?://.*?)//+(.*)");
33
34 public StripExtraSlashes(String name) {
35 super(name, DESCRIPTION);
36 }
37
38 public String canonicalize(String url, Object context) {
39 Matcher matcher = REGEX.matcher(url);
40 while (matcher.matches()) {
41 url = matcher.group(1) + "/" + matcher.group(2);
42 matcher = REGEX.matcher(url);
43 }
44 return url;
45 }
46 }