Source Code Cross Referenced for TooManyHopsDecideRule.java in  » Web-Crawler » heritrix » org » archive » crawler » deciderules » 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.deciderules 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /* AcceptRule
02:         *
03:         * $Id: TooManyHopsDecideRule.java 4649 2006-09-25 17:16:55Z paul_jack $
04:         *
05:         * Created on Apr 1, 2005
06:         *
07:         * Copyright (C) 2005 Internet Archive.
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.deciderules;
26:
27:        import org.archive.crawler.datamodel.CandidateURI;
28:        import org.archive.crawler.settings.SimpleType;
29:        import org.archive.crawler.settings.Type;
30:
31:        /**
32:         * Rule REJECTs any CrawlURIs whose total number of hops (length of the 
33:         * hopsPath string, traversed links of any type) is over a threshold.
34:         * Otherwise returns PASS.
35:         *
36:         * @author gojomo
37:         */
38:        public class TooManyHopsDecideRule extends PredicatedDecideRule {
39:
40:            private static final long serialVersionUID = -5429536193865916670L;
41:
42:            private static final String ATTR_MAX_HOPS = "max-hops";
43:
44:            /**
45:             * Default access so available to test code.
46:             */
47:            static final Integer DEFAULT_MAX_HOPS = new Integer(20);
48:
49:            /**
50:             * Usual constructor. 
51:             * @param name Name of this DecideRule.
52:             */
53:            public TooManyHopsDecideRule(String name) {
54:                super (name);
55:                setDescription("TooManyHopsDecideRule. REJECTs URIs discovered "
56:                        + "after too many hops (followed links of any type) from seed.");
57:                addElementToDefinition(new SimpleType(ATTR_MAX_HOPS, "Max path"
58:                        + " depth for which this filter will match",
59:                        DEFAULT_MAX_HOPS));
60:                // make default REJECT (overriding superclass) & always-default
61:                Type type = addElementToDefinition(new SimpleType(
62:                        ATTR_DECISION, "Decision to be applied", REJECT,
63:                        ALLOWED_TYPES));
64:                type.setTransient(true);
65:            }
66:
67:            /**
68:             * Evaluate whether given object is over the threshold number of
69:             * hops.
70:             * 
71:             * @param object
72:             * @return true if the mx-hops is exceeded
73:             */
74:            protected boolean evaluate(Object object) {
75:                try {
76:                    CandidateURI curi = (CandidateURI) object;
77:                    return curi.getPathFromSeed() != null
78:                            && curi.getPathFromSeed().length() > getThresholdHops(object);
79:                } catch (ClassCastException e) {
80:                    // if not CrawlURI, always disregard
81:                    return false;
82:                }
83:            }
84:
85:            /**
86:             * @param obj Conext object.
87:             * @return hops cutoff threshold
88:             */
89:            private int getThresholdHops(Object obj) {
90:                return ((Integer) getUncheckedAttribute(obj, ATTR_MAX_HOPS))
91:                        .intValue();
92:            }
93:        }
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