Source Code Cross Referenced for Classifier.java in  » Web-Crawler » WebSPHINX » websphinx » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Web Crawler » WebSPHINX » websphinx 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /*
02:         * WebSphinx web-crawling toolkit
03:         *
04:         * Copyright (c) 1998-2002 Carnegie Mellon University.  All rights
05:         * reserved.
06:         *
07:         * Redistribution and use in source and binary forms, with or without
08:         * modification, are permitted provided that the following conditions
09:         * are met:
10:         *
11:         * 1. Redistributions of source code must retain the above copyright
12:         *    notice, this list of conditions and the following disclaimer.
13:         *
14:         * 2. Redistributions in binary form must reproduce the above copyright
15:         *    notice, this list of conditions and the following disclaimer in
16:         *    the documentation and/or other materials provided with the
17:         *    distribution.
18:         *
19:         * THIS SOFTWARE IS PROVIDED BY CARNEGIE MELLON UNIVERSITY ``AS IS'' AND
20:         * ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
21:         * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22:         * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY
23:         * NOR ITS EMPLOYEES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24:         * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
25:         * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26:         * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27:         * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28:         * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
29:         * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30:         *
31:         */
32:
33:        package websphinx;
34:
35:        /**
36:         * Classifier interface.  A classifier is a helper object that annotates
37:         * pages and links with labels (using Page.setLabel() and Link.setLabel()).
38:         * When a page is retrieved by a crawler, it is passed to the classify()
39:         * method of every Classifier registered with the crawler.  Here are some
40:         * typical uses for classifiers:
41:         * <UL>
42:         * <LI> classifying links into categories like child or parent (see
43:         *  websphinx.StandardClassifier);
44:         * <LI> classifying pages into categories like biology or computers;
45:         * <LI> recognizing and parsing pages formatted in a particular style, such as
46:         *      AltaVista, Yahoo, or latex2html (e.g., the search engine classifiers
47:         *      in websphinx.searchengine)
48:         * <LI>
49:         * </UL>
50:         */
51:        public interface Classifier
52:        //#ifdef JDK1.1 
53:                extends java.io.Serializable
54:        //#endif JDK1.1
55:        {
56:            /** 
57:             * Classify a page.  Typically, the classifier calls page.setLabel() and
58:             * page.setField() to mark up the page.  The classifier may also look
59:             * through the page's links and call link.setLabel() to mark them up.
60:             * @param page Page to classify
61:             */
62:            public abstract void classify(Page page);
63:
64:            /** 
65:             * Get priority of this classifier.  Lower priorities execute first.
66:             * A classifier should also define a public constant <CODE>priority</CODE>
67:             * so that classifiers that depend on it can compute their 
68:             * priorities statically.  For example, if your classifier
69:             * depends on FooClassifier and BarClassifier, you might set your
70:             * priority as:
71:             * <PRE>
72:             * public static final float priority = Math.max (FooClassifier, BarClassifier) + 1;
73:             * public float getPriority () { return priority; }
74:             * </PRE>
75:             * 
76:             * @return priority of this classifier
77:             */
78:            public float getPriority();
79:        }
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