Source Code Cross Referenced for TextWaitEvaluator.java in  » Web-Crawler » heritrix » org » archive » crawler » postprocessor » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Web Crawler » heritrix » org.archive.crawler.postprocessor 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /* TextWaitEvaluator
02:         * 
03:         * $Id: TextWaitEvaluator.java 4667 2006-09-26 20:38:48Z paul_jack $
04:         * 
05:         * Created on 1.4.2005
06:         *
07:         * Copyright (C) 2005 Kristinn Sigurdsson
08:         * 
09:         * 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.postprocessor;
26:
27:        /**
28:         * A specialized ContentBasedWaitEvaluator. Comes preset with a regular 
29:         * expression that matches text documents. <code>^text/.*$</code>
30:         *
31:         * @author Kristinn Sigurdsson
32:         * 
33:         * @see org.archive.crawler.postprocessor.ContentBasedWaitEvaluator
34:         */
35:        public class TextWaitEvaluator extends ContentBasedWaitEvaluator {
36:
37:            private static final long serialVersionUID = -328402266684681632L;
38:
39:            protected final static Long DEFAULT_INITIAL_WAIT_INTERVAL = new Long(
40:                    43200); // 12 hours
41:
42:            protected final static String DEFAULT_CONTENT_REGEXPR = "^text/.*$"; //Text
43:
44:            /**
45:             * Constructor
46:             * 
47:             * @param name The name of the module
48:             */
49:            public TextWaitEvaluator(String name) {
50:                super (
51:                        name,
52:                        "Evaluates how long to wait before fetching a URI again. "
53:                                + "Only handles CrawlURIs whose content type indicates a "
54:                                + "text document (^text/.*$).\n"
55:                                + "Typically, this processor should be in the post processing "
56:                                + "chain. It will pass if another wait evaluator has already "
57:                                + "processed the CrawlURI.",
58:                        DEFAULT_CONTENT_REGEXPR, DEFAULT_INITIAL_WAIT_INTERVAL,
59:                        DEFAULT_MAX_WAIT_INTERVAL, DEFAULT_MIN_WAIT_INTERVAL,
60:                        DEFAULT_UNCHANGED_FACTOR, DEFAULT_CHANGED_FACTOR);
61:            }
62:
63:        }
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