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Java > Open Source Codes > org > archive > crawler > frontier > AdaptiveRevisitAttributeConstants


1 /* Constants
2  *
3  * $Id: AdaptiveRevisitAttributeConstants.java,v 1.2 2005/04/01 14:57:45 kristinn_sig Exp $
4  *
5  * Created on 26.11.2004
6  *
7  * Copyright (C) 2004 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.frontier;
26
27 import org.archive.crawler.datamodel.CoreAttributeConstants;
28
29 /**
30  * Defines static constants for the Adaptive Revisiting module defining data
31  * keys in the CrawlURI AList.
32  *
33  * @author Kristinn Sigurdsson
34  *
35  * @see org.archive.crawler.datamodel.CoreAttributeConstants
36  */
37 public interface AdaptiveRevisitAttributeConstants
38 extends CoreAttributeConstants {
39
40     /** Designates a field in the CrawlURIs AList for the content digest of
41      * an earlier visit. */
42     public static final String JavaDoc A_LAST_CONTENT_DIGEST = "last-content-digest";
43     public static final String JavaDoc A_TIME_OF_NEXT_PROCESSING =
44         "time-of-next-processing";
45     public static final String JavaDoc A_WAIT_INTERVAL = "wait-interval";
46     public static final String JavaDoc A_NUMBER_OF_VISITS = "number-of-visits";
47     public static final String JavaDoc A_NUMBER_OF_VERSIONS = "number-of-versions";
48     public static final String JavaDoc A_FETCH_OVERDUE = "fetch-overdue";
49     
50     public static final String JavaDoc A_LAST_ETAG = "last-etag";
51     public static final String JavaDoc A_LAST_DATESTAMP = "last-datestamp";
52     
53     public static final String JavaDoc A_WAIT_REEVALUATED = "wait-reevaluated";
54     
55     /** No knowledge of URI content. Possibly not fetched yet, unable
56      * to check if different or an error occured on last fetch attempt. */
57     public static final int CONTENT_UNKNOWN = -1;
58     
59     /** URI content has not changed between the two latest, successfully
60      * completed fetches. */
61     public static final int CONTENT_UNCHANGED = 0;
62     
63     /** URI content had changed between the two latest, successfully completed
64      * fetches. By definition, content has changed if there has only been one
65      * successful fetch made. */
66     public static final int CONTENT_CHANGED = 1;
67
68     /**
69      * Key to use getting state of crawluri from the CrawlURI alist.
70      */
71     public static final String JavaDoc A_CONTENT_STATE_KEY = "ar-state";
72 }
73
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