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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>Preselector xref</title><link type="text/css" rel="stylesheet" href="../../../../stylesheet.css" /></head><body><div id="overview"><a href="../../../../../apidocs/org/archive/crawler/prefetch/Preselector.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"> * SimplePreselector.java</em><a name="20" href="#20">20</a> <em class="comment"> * Created on Sep 22, 2003</em><a name="21" href="#21">21</a> <em class="comment"> *</em><a name="22" href="#22">22</a> <em class="comment"> * $Header: /cvsroot/archive-crawler/ArchiveOpenCrawler/src/java/org/archive/crawler/prefetch/Preselector.java,v 1.7 2005/12/22 19:20:44 stack-sf Exp $</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/prefetch/package-summary.html">org.archive.crawler.prefetch</a>;<a name="25" href="#25">25</a> <a name="26" href="#26">26</a> <strong>import</strong> javax.management.AttributeNotFoundException;<a name="27" href="#27">27</a> <a name="28" href="#28">28</a> <strong>import</strong> org.archive.crawler.datamodel.CrawlURI;<a name="29" href="#29">29</a> <strong>import</strong> org.archive.crawler.datamodel.FetchStatusCodes;<a name="30" href="#30">30</a> <strong>import</strong> org.archive.crawler.framework.Scoper;<a name="31" href="#31">31</a> <strong>import</strong> org.archive.crawler.settings.SimpleType;<a name="32" href="#32">32</a> <strong>import</strong> org.archive.crawler.settings.Type;<a name="33" href="#33">33</a> <strong>import</strong> org.archive.util.TextUtils;<a name="34" href="#34">34</a> <a name="35" href="#35">35</a> <em>/**<em>*</em></em><a name="36" href="#36">36</a> <em> * If set to recheck the crawl's scope, gives a yes/no on whether</em><a name="37" href="#37">37</a> <em> * a CrawlURI should be processed at all. If not, its status</em><a name="38" href="#38">38</a> <em> * will be marked OUT_OF_SCOPE and the URI will skip directly</em><a name="39" href="#39">39</a> <em> * to the first "postprocessor".</em><a name="40" href="#40">40</a> <em> *</em><a name="41" href="#41">41</a> <em> *</em><a name="42" href="#42">42</a> <em> * @author gojomo</em><a name="43" href="#43">43</a> <em> *</em><a name="44" href="#44">44</a> <em> */</em><a name="45" href="#45">45</a> <strong>public</strong> <strong>class</strong> <a href="../../../../org/archive/crawler/prefetch/Preselector.html">Preselector</a> <strong>extends</strong> <a href="../../../../org/archive/crawler/framework/Scoper.html">Scoper</a><a name="46" href="#46">46</a> implements <a href="../../../../org/archive/crawler/datamodel/FetchStatusCodes.html">FetchStatusCodes</a> {<a name="47" href="#47">47</a> <a name="48" href="#48">48</a> <em>/**<em>* whether to reapply crawl scope at this step */</em></em><a name="49" href="#49">49</a> <strong>public</strong> <strong>static</strong> <strong>final</strong> String ATTR_RECHECK_SCOPE = <span class="string">"recheck-scope"</span>;<a name="50" href="#50">50</a> <em>/**<em>* indicator allowing all URIs (of a given host, typically) to</em></em><a name="51" href="#51">51</a> <em> * be blocked at this step*/</em><a name="52" href="#52">52</a> <strong>public</strong> <strong>static</strong> <strong>final</strong> String ATTR_BLOCK_ALL = <span class="string">"block-all"</span>;<a name="53" href="#53">53</a> <em>/**<em>* indicator allowing all matching URIs to be blocked at this step */</em></em><a name="54" href="#54">54</a> <strong>public</strong> <strong>static</strong> <strong>final</strong> String ATTR_BLOCK_BY_REGEXP = <span class="string">"block-by-regexp"</span>;<a name="55" href="#55">55</a> <em>/**<em>* indicator allowing all matching URIs */</em></em><a name="56" href="#56">56</a> <strong>public</strong> <strong>static</strong> <strong>final</strong> String ATTR_ALLOW_BY_REGEXP = <span class="string">"allow-by-regexp"</span>;<a name="57" href="#57">57</a> <a name="58" href="#58">58</a> <em>/**<em>*</em></em><a name="59" href="#59">59</a> <em> * Constructor.</em><a name="60" href="#60">60</a> <em> * @param name Name of this processor.</em><a name="61" href="#61">61</a> <em> */</em><a name="62" href="#62">62</a> <strong>public</strong> <a href="../../../../org/archive/crawler/prefetch/Preselector.html">Preselector</a>(String name) {<a name="63" href="#63">63</a> <strong>super</strong>(name, <span class="string">"Preselector. Does one last bit of checking to make "</span> +<a name="64" href="#64">64</a> <span class="string">"sure that the current URI should be fetched."</span>);<a name="65" href="#65">65</a> <a href="../../../../org/archive/crawler/settings/Type.html">Type</a> e;<a name="66" href="#66">66</a> e = addElementToDefinition(<strong>new</strong> <a href="../../../../org/archive/crawler/settings/SimpleType.html">SimpleType</a>(ATTR_RECHECK_SCOPE,<a name="67" href="#67">67</a> <span class="string">"Recheck if uri is in scope. This is meaningful if the scope"</span> +<a name="68" href="#68">68</a> <span class="string">" is altered during a crawl. URIs are checked against the"</span> +<a name="69" href="#69">69</a> <span class="string">" scope when they are added to queues. Setting this value to"</span> +<a name="70" href="#70">70</a> <span class="string">" true forces the URI to be checked against the scope when it"</span> +<a name="71" href="#71">71</a> <span class="string">" is comming out of the queue, possibly after the scope is"</span> +<a name="72" href="#72">72</a> <span class="string">" altered."</span>, <strong>new</strong> Boolean(false)));<a name="73" href="#73">73</a> e.setExpertSetting(<strong>true</strong>);<a name="74" href="#74">74</a> <a name="75" href="#75">75</a> e = addElementToDefinition(<strong>new</strong> <a href="../../../../org/archive/crawler/settings/SimpleType.html">SimpleType</a>(ATTR_BLOCK_ALL,<a name="76" href="#76">76</a> <span class="string">"Block all URIs from being processed. This is most likely to"</span> +<a name="77" href="#77">77</a> <span class="string">" be used in overrides to easily reject certain hosts from"</span> +<a name="78" href="#78">78</a> <span class="string">" being processed."</span>, <strong>new</strong> Boolean(false)));<a name="79" href="#79">79</a> e.setExpertSetting(<strong>true</strong>);<a name="80" href="#80">80</a> <a name="81" href="#81">81</a> e = addElementToDefinition(<strong>new</strong> <a href="../../../../org/archive/crawler/settings/SimpleType.html">SimpleType</a>(ATTR_BLOCK_BY_REGEXP,<a name="82" href="#82">82</a> <span class="string">"Block all URIs matching the regular expression from being"</span> +<a name="83" href="#83">83</a> <span class="string">" processed."</span>, <span class="string">""</span>));<a name="84" href="#84">84</a> e.setExpertSetting(<strong>true</strong>);<a name="85" href="#85">85</a> <a name="86" href="#86">86</a> e = addElementToDefinition(<strong>new</strong> <a href="../../../../org/archive/crawler/settings/SimpleType.html">SimpleType</a>(ATTR_ALLOW_BY_REGEXP,<a name="87" href="#87">87</a> <span class="string">"Allow only URIs matching the regular expression to be"</span> +<a name="88" href="#88">88</a> <span class="string">" processed."</span>, <span class="string">""</span>));<a name="89" href="#89">89</a> e.setExpertSetting(<strong>true</strong>);<a name="90" href="#90">90</a> }<a name="91" href="#91">91</a> <a name="92" href="#92">92</a> <strong>protected</strong> <strong>void</strong> innerProcess(<a href="../../../../org/archive/crawler/datamodel/CrawlURI.html">CrawlURI</a> curi) {<a name="93" href="#93">93</a> <em class="comment">// Check if uris should be blocked</em><a name="94" href="#94">94</a> <strong>try</strong> {<a name="95" href="#95">95</a> <strong>if</strong> (((Boolean) getAttribute(ATTR_BLOCK_ALL, curi)).booleanValue()) {<a name="96" href="#96">96</a> curi.setFetchStatus(S_BLOCKED_BY_USER);<a name="97" href="#97">97</a> curi.skipToProcessorChain(getController().<a name="98" href="#98">98</a> getPostprocessorChain());<a name="99" href="#99">99</a> }<a name="100" href="#100">100</a> } <strong>catch</strong> (AttributeNotFoundException e) {<a name="101" href="#101">101</a> <em class="comment">// Act as attribute was false, that is: do nothing.</em><a name="102" href="#102">102</a> }<a name="103" href="#103">103</a> <a name="104" href="#104">104</a> <em class="comment">// Check if allowed by regular expression</em><a name="105" href="#105">105</a> <strong>try</strong> {<a name="106" href="#106">106</a> String regexp = (String) getAttribute(ATTR_ALLOW_BY_REGEXP, curi);<a name="107" href="#107">107</a> <strong>if</strong> (regexp != <strong>null</strong> && !regexp.equals(<span class="string">""</span>)) {<a name="108" href="#108">108</a> <strong>if</strong> (!TextUtils.matches(regexp, curi.toString())) {<a name="109" href="#109">109</a> curi.setFetchStatus(S_BLOCKED_BY_USER);<a name="110" href="#110">110</a> curi.skipToProcessorChain(getController().<a name="111" href="#111">111</a> getPostprocessorChain());<a name="112" href="#112">112</a> }<a name="113" href="#113">113</a> }<a name="114" href="#114">114</a> } <strong>catch</strong> (AttributeNotFoundException e) {<a name="115" href="#115">115</a> <em class="comment">// Act as regexp was null, that is: do nothing.</em><a name="116" href="#116">116</a> }<a name="117" href="#117">117</a> <a name="118" href="#118">118</a> <a name="119" href="#119">119</a> <em class="comment">// Check if blocked by regular expression</em><a name="120" href="#120">120</a> <strong>try</strong> {<a name="121" href="#121">121</a> String regexp = (String) getAttribute(ATTR_BLOCK_BY_REGEXP, curi);<a name="122" href="#122">122</a> <strong>if</strong> (regexp != <strong>null</strong> && !regexp.equals(<span class="string">""</span>)) {<a name="123" href="#123">123</a> <strong>if</strong> (TextUtils.matches(regexp, curi.toString())) {<a name="124" href="#124">124</a> curi.setFetchStatus(S_BLOCKED_BY_USER);<a name="125" href="#125">125</a> curi.skipToProcessorChain(getController().<a name="126" href="#126">126</a> getPostprocessorChain());<a name="127" href="#127">127</a> }<a name="128" href="#128">128</a> }<a name="129" href="#129">129</a> } <strong>catch</strong> (AttributeNotFoundException e) {<a name="130" href="#130">130</a> <em class="comment">// Act as regexp was null, that is: do nothing.</em><a name="131" href="#131">131</a> }<a name="132" href="#132">132</a> <a name="133" href="#133">133</a> <em class="comment">// Possibly recheck scope</em><a name="134" href="#134">134</a> <strong>try</strong> {<a name="135" href="#135">135</a> <strong>if</strong> (((Boolean) getAttribute(ATTR_RECHECK_SCOPE, curi)).<a name="136" href="#136">136</a> booleanValue()) {<a name="137" href="#137">137</a> <strong>if</strong> (!isInScope(curi)) {<a name="138" href="#138">138</a> <em class="comment">// Scope rejected</em><a name="139" href="#139">139</a> curi.setFetchStatus(S_OUT_OF_SCOPE);<a name="140" href="#140">140</a> curi.skipToProcessorChain(getController().<a name="141" href="#141">141</a> getPostprocessorChain());<a name="142" href="#142">142</a> }<a name="143" href="#143">143</a> }<a name="144" href="#144">144</a> } <strong>catch</strong> (AttributeNotFoundException e) {<a name="145" href="#145">145</a> <em class="comment">// Act as attribute was false, that is: do nothing.</em><a name="146" href="#146">146</a> }<a name="147" href="#147">147</a> }<a name="148" href="#148">148</a> }</pre><hr/><div id="footer">This page was automatically generated by <a href="http://maven.apache.org/">Maven</a></div></body></html>⌨️ 快捷键说明
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