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 * MemUURISet.java
20 * Created on Sep 15, 2003
21 *
22 * $Header$
23 */
24 package org.archive.crawler.util;
25
26 import java.util.HashSet;
27
28 /***
29 * A purely in-memory UriUniqFilter based on a HashSet, which remembers
30 * every full URI string it sees.
31 *
32 * @author gojomo
33 *
34 */
35 public class MemUriUniqFilter
36 extends SetBasedUriUniqFilter {
37 HashSet<CharSequence> hashSet;
38
39 protected synchronized boolean setAdd(CharSequence uri) {
40 return hashSet.add(uri);
41 }
42 protected synchronized boolean setRemove(CharSequence uri) {
43 return hashSet.remove(uri);
44 }
45 protected synchronized long setCount() {
46 return (long)hashSet.size();
47 }
48
49 /* (non-Javadoc)
50 * @see org.archive.crawler.util.UriUniqFilterImpl#createUriSet()
51 */
52 protected void createUriSet() {
53 hashSet = new HashSet<CharSequence>();
54 }
55
56 }