?? pathologicalpathfilter.html
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"><head><meta http-equiv="content-type" content="text/html; charset=UTF-8" /><title>PathologicalPathFilter xref</title><link type="text/css" rel="stylesheet" href="../../../../stylesheet.css" /></head><body><div id="overview"><a href="../../../../../apidocs/org/archive/crawler/filter/PathologicalPathFilter.html">View Javadoc</a></div><pre><a name="1" href="#1">1</a> <em class="comment">/*<em class="comment"> PathologicalFilter</em></em><a name="2" href="#2">2</a> <em class="comment"> *</em><a name="3" href="#3">3</a> <em class="comment"> * $Id: PathologicalPathFilter.java 4652 2006-09-25 18:41:10Z paul_jack $</em><a name="4" href="#4">4</a> <em class="comment"> *</em><a name="5" href="#5">5</a> <em class="comment"> * Created on Feb 20, 2004</em><a name="6" href="#6">6</a> <em class="comment"> *</em><a name="7" href="#7">7</a> <em class="comment"> * Copyright (C) 2004 Internet Archive.</em><a name="8" href="#8">8</a> <em class="comment"> *</em><a name="9" href="#9">9</a> <em class="comment"> * This file is part of the Heritrix web crawler (crawler.archive.org).</em><a name="10" href="#10">10</a> <em class="comment"> *</em><a name="11" href="#11">11</a> <em class="comment"> * Heritrix is free software; you can redistribute it and/or modify</em><a name="12" href="#12">12</a> <em class="comment"> * it under the terms of the GNU Lesser Public License as published by</em><a name="13" href="#13">13</a> <em class="comment"> * the Free Software Foundation; either version 2.1 of the License, or</em><a name="14" href="#14">14</a> <em class="comment"> * any later version.</em><a name="15" href="#15">15</a> <em class="comment"> *</em><a name="16" href="#16">16</a> <em class="comment"> * Heritrix is distributed in the hope that it will be useful,</em><a name="17" href="#17">17</a> <em class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</em><a name="18" href="#18">18</a> <em class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</em><a name="19" href="#19">19</a> <em class="comment"> * GNU Lesser Public License for more details.</em><a name="20" href="#20">20</a> <em class="comment"> *</em><a name="21" href="#21">21</a> <em class="comment"> * You should have received a copy of the GNU Lesser Public License</em><a name="22" href="#22">22</a> <em class="comment"> * along with Heritrix; if not, write to the Free Software</em><a name="23" href="#23">23</a> <em class="comment"> * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA</em><a name="24" href="#24">24</a> <em class="comment"> */</em><a name="25" href="#25">25</a> <strong>package</strong> <a href="../../../../org/archive/crawler/filter/package-summary.html">org.archive.crawler.filter</a>;<a name="26" href="#26">26</a> <a name="27" href="#27">27</a> <strong>import</strong> java.util.logging.Logger;<a name="28" href="#28">28</a> <a name="29" href="#29">29</a> <strong>import</strong> javax.management.AttributeNotFoundException;<a name="30" href="#30">30</a> <a name="31" href="#31">31</a> <strong>import</strong> org.archive.crawler.datamodel.CrawlURI;<a name="32" href="#32">32</a> <strong>import</strong> org.archive.crawler.deciderules.DecideRule;<a name="33" href="#33">33</a> <strong>import</strong> org.archive.crawler.deciderules.DecidingFilter;<a name="34" href="#34">34</a> <strong>import</strong> org.archive.crawler.settings.SimpleType;<a name="35" href="#35">35</a> <strong>import</strong> org.archive.crawler.settings.Type;<a name="36" href="#36">36</a> <a name="37" href="#37">37</a> <em>/**<em>* </em></em><a name="38" href="#38">38</a> <em> * Checks if a URI contains a repeated pattern.</em><a name="39" href="#39">39</a> <em> *</em><a name="40" href="#40">40</a> <em> * This filter is checking if a pattern is repeated a specific number of times.</em><a name="41" href="#41">41</a> <em> * The use is to avoid crawler traps where the server adds the same pattern to</em><a name="42" href="#42">42</a> <em> * the requested URI like: <code><a href="http://host/img/img/img/img....</code" target="alexandria_uri">http://host/img/img/img/img....</code</a>>. This</em><a name="43" href="#43">43</a> <em> * filter returns TRUE if the path is pathological. FALSE otherwise.</em><a name="44" href="#44">44</a> <em> *</em><a name="45" href="#45">45</a> <em> * @author John Erik Halse</em><a name="46" href="#46">46</a> <em> * @deprecated As of release 1.10.0. Replaced by {@link DecidingFilter} and</em><a name="47" href="#47">47</a> <em> * equivalent {@link DecideRule}.</em><a name="48" href="#48">48</a> <em> */</em><a name="49" href="#49">49</a> <strong>public</strong> <strong>class</strong> <a href="../../../../org/archive/crawler/filter/PathologicalPathFilter.html">PathologicalPathFilter</a> <strong>extends</strong> <a href="../../../../org/archive/crawler/filter/URIRegExpFilter.html">URIRegExpFilter</a> {<a name="50" href="#50">50</a> <a name="51" href="#51">51</a> <strong>private</strong> <strong>static</strong> <strong>final</strong> <strong>long</strong> serialVersionUID = 2797805167250054353L;<a name="52" href="#52">52</a> <a name="53" href="#53">53</a> <strong>private</strong> <strong>static</strong> <strong>final</strong> Logger logger =<a name="54" href="#54">54</a> Logger.getLogger(PathologicalPathFilter.<strong>class</strong>.getName());<a name="55" href="#55">55</a> <a name="56" href="#56">56</a> <strong>public</strong> <strong>static</strong> <strong>final</strong> String ATTR_REPETITIONS = <span class="string">"repetitions"</span>;<a name="57" href="#57">57</a> <a name="58" href="#58">58</a> <strong>public</strong> <strong>static</strong> <strong>final</strong> Integer DEFAULT_REPETITIONS = <strong>new</strong> Integer(3);<a name="59" href="#59">59</a> <a name="60" href="#60">60</a> <strong>private</strong> <strong>final</strong> String REGEX_PREFIX = <span class="string">".*?/(.*?/)//1{"</span>;<a name="61" href="#61">61</a> <strong>private</strong> <strong>final</strong> String REGEX_SUFFIX = <span class="string">",}.*"</span>;<a name="62" href="#62">62</a> <a name="63" href="#63">63</a> <em>/**<em>* Constructs a new PathologicalPathFilter.</em></em><a name="64" href="#64">64</a> <em> *</em><a name="65" href="#65">65</a> <em> * @param name the name of the filter.</em><a name="66" href="#66">66</a> <em> */</em><a name="67" href="#67">67</a> <strong>public</strong> <a href="../../../../org/archive/crawler/filter/PathologicalPathFilter.html">PathologicalPathFilter</a>(String name) {<a name="68" href="#68">68</a> <strong>super</strong>(name);<a name="69" href="#69">69</a> setDescription(<span class="string">"Pathological path filter *Deprecated* Use"</span> +<a name="70" href="#70">70</a> <span class="string">"DecidingFilter and equivalent DecideRule instead. "</span> +<a name="71" href="#71">71</a> <span class="string">"The Pathologicalpath filter"</span> +<a name="72" href="#72">72</a> <span class="string">" is used to avoid crawler traps by adding a constraint on"</span> +<a name="73" href="#73">73</a> <span class="string">" how many times a pattern in the URI could be repeated."</span> +<a name="74" href="#74">74</a> <span class="string">" Returns false if the path is NOT pathological (There"</span> +<a name="75" href="#75">75</a> <span class="string">" are no subpath reptitions or reptitions are less than"</span> +<a name="76" href="#76">76</a> <span class="string">" the '"</span> + ATTR_REPETITIONS + <span class="string">"' limit)."</span>);<a name="77" href="#77">77</a> <a name="78" href="#78">78</a> <a href="../../../../org/archive/crawler/settings/Type.html">Type</a> type = getElementFromDefinition(ATTR_MATCH_RETURN_VALUE);<a name="79" href="#79">79</a> type.setTransient(<strong>true</strong>);<a name="80" href="#80">80</a> <a name="81" href="#81">81</a> type = getElementFromDefinition(ATTR_REGEXP);<a name="82" href="#82">82</a> type.setTransient(<strong>true</strong>);<a name="83" href="#83">83</a> <a name="84" href="#84">84</a> addElementToDefinition(<strong>new</strong> <a href="../../../../org/archive/crawler/settings/SimpleType.html">SimpleType</a>(ATTR_REPETITIONS,<a name="85" href="#85">85</a> <span class="string">"Number of times the pattern should be allowed to occur. \n"</span> +<a name="86" href="#86">86</a> <span class="string">"This filter returns true if number of repetitions of a"</span> +<a name="87" href="#87">87</a> <span class="string">" pattern exceeds this value"</span>,<a name="88" href="#88">88</a> DEFAULT_REPETITIONS));<a name="89" href="#89">89</a> }<a name="90" href="#90">90</a> <a name="91" href="#91">91</a> <em>/**<em>* </em></em><a name="92" href="#92">92</a> <em> * Construct the regexp string to be matched aginst the URI.</em><a name="93" href="#93">93</a> <em> * @param o an object to extract a URI from.</em><a name="94" href="#94">94</a> <em> * @return the regexp pattern.</em><a name="95" href="#95">95</a> <em> */</em><a name="96" href="#96">96</a> <strong>protected</strong> String getRegexp(Object o) {<a name="97" href="#97">97</a> <strong>int</strong> rep = 0;<a name="98" href="#98">98</a> <strong>try</strong> {<a name="99" href="#99">99</a> rep = ((Integer)getAttribute(o, ATTR_REPETITIONS)).intValue();<a name="100" href="#100">100</a> } <strong>catch</strong> (AttributeNotFoundException e) {<a name="101" href="#101">101</a> logger.severe(e.getMessage());<a name="102" href="#102">102</a> }<a name="103" href="#103">103</a> <strong>return</strong> rep == 0? <strong>null</strong>: REGEX_PREFIX + (rep - 1) + REGEX_SUFFIX;<a name="104" href="#104">104</a> }<a name="105" href="#105">105</a> <a name="106" href="#106">106</a> <strong>protected</strong> <strong>boolean</strong> getFilterOffPosition(<a href="../../../../org/archive/crawler/datamodel/CrawlURI.html">CrawlURI</a> curi) {<a name="107" href="#107">107</a> <strong>return</strong> false;<a name="108" href="#108">108</a> }<a name="109" href="#109">109</a> }</pre><hr/><div id="footer">This page was automatically generated by <a href="http://maven.apache.org/">Maven</a></div></body></html>?? 快捷鍵說明
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