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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>RobotsHonoringPolicy xref</title><link type="text/css" rel="stylesheet" href="../../../../stylesheet.css" /></head><body><div id="overview"><a href="../../../../../apidocs/org/archive/crawler/datamodel/RobotsHonoringPolicy.html">View Javadoc</a></div><pre><a name="1" href="#1">1</a> <em class="comment">/*<em class="comment"> Copyright (C) 2003 Internet Archive.</em></em><a name="2" href="#2">2</a> <em class="comment"> *</em><a name="3" href="#3">3</a> <em class="comment"> * This file is part of the Heritrix web crawler (crawler.archive.org).</em><a name="4" href="#4">4</a> <em class="comment"> *</em><a name="5" href="#5">5</a> <em class="comment"> * Heritrix is free software; you can redistribute it and/or modify</em><a name="6" href="#6">6</a> <em class="comment"> * it under the terms of the GNU Lesser Public License as published by</em><a name="7" href="#7">7</a> <em class="comment"> * the Free Software Foundation; either version 2.1 of the License, or</em><a name="8" href="#8">8</a> <em class="comment"> * any later version.</em><a name="9" href="#9">9</a> <em class="comment"> *</em><a name="10" href="#10">10</a> <em class="comment"> * Heritrix is distributed in the hope that it will be useful,</em><a name="11" href="#11">11</a> <em class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</em><a name="12" href="#12">12</a> <em class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</em><a name="13" href="#13">13</a> <em class="comment"> * GNU Lesser Public License for more details.</em><a name="14" href="#14">14</a> <em class="comment"> *</em><a name="15" href="#15">15</a> <em class="comment"> * You should have received a copy of the GNU Lesser Public License</em><a name="16" href="#16">16</a> <em class="comment"> * along with Heritrix; if not, write to the Free Software</em><a name="17" href="#17">17</a> <em class="comment"> * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA</em><a name="18" href="#18">18</a> <em class="comment"> *</em><a name="19" href="#19">19</a> <em class="comment"> * RobotsHonoringPolicy.java</em><a name="20" href="#20">20</a> <em class="comment"> * Created on Oct 30, 2003</em><a name="21" href="#21">21</a> <em class="comment"> *</em><a name="22" href="#22">22</a> <em class="comment"> * $Header$</em><a name="23" href="#23">23</a> <em class="comment"> */</em><a name="24" href="#24">24</a> <strong>package</strong> <a href="../../../../org/archive/crawler/datamodel/package-summary.html">org.archive.crawler.datamodel</a>;<a name="25" href="#25">25</a> <a name="26" href="#26">26</a> <strong>import</strong> java.util.logging.Logger;<a name="27" href="#27">27</a> <a name="28" href="#28">28</a> <strong>import</strong> javax.management.AttributeNotFoundException;<a name="29" href="#29">29</a> <a name="30" href="#30">30</a> <strong>import</strong> org.archive.crawler.settings.CrawlerSettings;<a name="31" href="#31">31</a> <strong>import</strong> org.archive.crawler.settings.ModuleType;<a name="32" href="#32">32</a> <strong>import</strong> org.archive.crawler.settings.SimpleType;<a name="33" href="#33">33</a> <strong>import</strong> org.archive.crawler.settings.StringList;<a name="34" href="#34">34</a> <strong>import</strong> org.archive.crawler.settings.TextField;<a name="35" href="#35">35</a> <a name="36" href="#36">36</a> <em>/**<em>*</em></em><a name="37" href="#37">37</a> <em> * RobotsHonoringPolicy represent the strategy used by the crawler </em><a name="38" href="#38">38</a> <em> * for determining how robots.txt files will be honored. </em><a name="39" href="#39">39</a> <em> *</em><a name="40" href="#40">40</a> <em> * Five kinds of policies exist:</em><a name="41" href="#41">41</a> <em> * <dl></em><a name="42" href="#42">42</a> <em> * <dt>classic:</dt></em><a name="43" href="#43">43</a> <em> * <dd>obey the first set of robots.txt directives that apply to your </em><a name="44" href="#44">44</a> <em> * current user-agent</dd></em><a name="45" href="#45">45</a> <em> * <dt>ignore:</dt></em><a name="46" href="#46">46</a> <em> * <dd>ignore robots.txt directives entirely</dd></em><a name="47" href="#47">47</a> <em> * <dt>custom:</dt></em><a name="48" href="#48">48</a> <em> * <dd>obey a specific operator-entered set of robots.txt directives </em><a name="49" href="#49">49</a> <em> * for a given host</dd></em><a name="50" href="#50">50</a> <em> * <dt>most-favored:</dt></em><a name="51" href="#51">51</a> <em> * <dd>obey the most liberal restrictions offered (if *any* crawler is </em><a name="52" href="#52">52</a> <em> * allowed to get a page, get it)</dd></em><a name="53" href="#53">53</a> <em> * <dt>most-favored-set:</dt></em><a name="54" href="#54">54</a> <em> * <dd>given some set of user-agent patterns, obey the most liberal </em><a name="55" href="#55">55</a> <em> * restriction offered to any</dd></em><a name="56" href="#56">56</a> <em> * </dl></em><a name="57" href="#57">57</a> <em> *</em><a name="58" href="#58">58</a> <em> * The two last ones has the opportunity of adopting a different user-agent </em><a name="59" href="#59">59</a> <em> * to reflect the restrictions we've opted to use.</em><a name="60" href="#60">60</a> <em> *</em><a name="61" href="#61">61</a> <em> * @author John Erik Halse</em><a name="62" href="#62">62</a> <em> *</em><a name="63" href="#63">63</a> <em> */</em><a name="64" href="#64">64</a> <strong>public</strong> <strong>class</strong> <a href="../../../../org/archive/crawler/datamodel/RobotsHonoringPolicy.html">RobotsHonoringPolicy</a> <strong>extends</strong> ModuleType {<a name="65" href="#65">65</a> <a name="66" href="#66">66</a> <strong>private</strong> <strong>static</strong> <strong>final</strong> <strong>long</strong> serialVersionUID = 8850011643923116605L;<a name="67" href="#67">67</a> <a name="68" href="#68">68</a> <strong>private</strong> <strong>static</strong> Logger logger =<a name="69" href="#69">69</a> Logger.getLogger(<span class="string">"org.archive.crawler.datamodel.RobotsHonoringPolicy"</span>);<a name="70" href="#70">70</a> <a name="71" href="#71">71</a> <strong>public</strong> <strong>final</strong> <strong>static</strong> <strong>int</strong> CLASSIC = 0;<a name="72" href="#72">72</a> <strong>public</strong> <strong>final</strong> <strong>static</strong> <strong>int</strong> IGNORE = 1;<a name="73" href="#73">73</a> <strong>public</strong> <strong>final</strong> <strong>static</strong> <strong>int</strong> CUSTOM = 2;<a name="74" href="#74">74</a> <strong>public</strong> <strong>final</strong> <strong>static</strong> <strong>int</strong> MOST_FAVORED = 3;<a name="75" href="#75">75</a> <strong>public</strong> <strong>final</strong> <strong>static</strong> <strong>int</strong> MOST_FAVORED_SET = 4;<a name="76" href="#76">76</a> <a name="77" href="#77">77</a> <strong>public</strong> <strong>final</strong> <strong>static</strong> String ATTR_NAME = <span class="string">"robots-honoring-policy"</span>;<a name="78" href="#78">78</a> <strong>public</strong> <strong>final</strong> <strong>static</strong> String ATTR_TYPE = <span class="string">"type"</span>;<a name="79" href="#79">79</a> <strong>public</strong> <strong>final</strong> <strong>static</strong> String ATTR_MASQUERADE = <span class="string">"masquerade"</span>;<a name="80" href="#80">80</a> <strong>public</strong> <strong>final</strong> <strong>static</strong> String ATTR_CUSTOM_ROBOTS = <span class="string">"custom-robots"</span>;<a name="81" href="#81">81</a> <strong>public</strong> <strong>final</strong> <strong>static</strong> String ATTR_USER_AGENTS = <span class="string">"user-agents"</span>;<a name="82" href="#82">82</a> <a name="83" href="#83">83</a> <a name="84" href="#84">84</a> <em>/**<em>*</em></em><a name="85" href="#85">85</a> <em> * Creates a new instance of RobotsHonoringPolicy.</em><a name="86" href="#86">86</a> <em> *</em><a name="87" href="#87">87</a> <em> * @param name the name of the RobotsHonoringPolicy attirubte.</em><a name="88" href="#88">88</a> <em> */</em><a name="89" href="#89">89</a> <strong>public</strong> <a href="../../../../org/archive/crawler/datamodel/RobotsHonoringPolicy.html">RobotsHonoringPolicy</a>(String name) {<a name="90" href="#90">90</a> <strong>super</strong>(name, <span class="string">"Robots honoring policy"</span>);<a name="91" href="#91">91</a> <a name="92" href="#92">92</a> String[] allowedTypes = <strong>new</strong> String[] {<a name="93" href="#93">93</a> <span class="string">"classic"</span>, <span class="string">"ignore"</span>, <span class="string">"custom"</span>, <a name="94" href="#94">94</a> <span class="string">"most-favored"</span>, <span class="string">"most-favored-set"</span>};<a name="95" href="#95">95</a> <a name="96" href="#96">96</a> addElementToDefinition(<strong>new</strong> <a href="../../../../org/archive/crawler/settings/SimpleType.html">SimpleType</a>(ATTR_TYPE,<a name="97" href="#97">97</a> <span class="string">"Policy type. The 'classic' policy simply obeys all "</span> +<a name="98" href="#98">98</a> <span class="string">"robots.txt rules for the configured user-agent. The "</span> +<a name="99" href="#99">99</a> <span class="string">"'ignore' policy ignores all robots rules. The 'custom' "</span> +<a name="100" href="#100">100</a> <span class="string">"policy allows you to specify a policy, in robots.txt "</span> +<a name="101" href="#101">101</a> <span class="string">"format, as a setting. The 'most-favored' policy will "</span> +<a name="102" href="#102">102</a> <span class="string">"crawl an URL if the robots.txt allows any user-agent to "</span> +<a name="103" href="#103">103</a> <span class="string">"crawl it. The 'most-favored-set' policy requires you "</span> +<a name="104" href="#104">104</a> <span class="string">"to supply an list of alternate user-agents, and for"</span> +<a name="105" href="#105">105</a> <span class="string">"every page, if any agent of the set is allowed, the"</span> +<a name="106" href="#106">106</a> <span class="string">"page will be crawled."</span>, <span class="string">"classic"</span>, allowedTypes));<a name="107" href="#107">107</a> addElementToDefinition(<strong>new</strong> <a href="../../../../org/archive/crawler/settings/SimpleType.html">SimpleType</a>(ATTR_MASQUERADE,<a name="108" href="#108">108</a> <span class="string">"Should we masquerade as another user agent when obeying "</span> +?? 快捷鍵說(shuō)明
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