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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>ExtractorXML xref</title><link type="text/css" rel="stylesheet" href="../../../../stylesheet.css" /></head><body><div id="overview"><a href="../../../../../apidocs/org/archive/crawler/extractor/ExtractorXML.html">View Javadoc</a></div><pre><a name="1" href="#1">1</a> <em class="comment">/*</em><a name="2" href="#2">2</a> <em class="comment"> * ExtractorXML</em><a name="3" href="#3">3</a> <em class="comment"> *</em><a name="4" href="#4">4</a> <em class="comment"> * $Id: ExtractorXML.java,v 1.3 2006/08/15 01:31:35 stack-sf Exp $</em><a name="5" href="#5">5</a> <em class="comment"> *</em><a name="6" href="#6">6</a> <em class="comment"> * Created on Sep 27, 2005</em><a name="7" href="#7">7</a> <em class="comment"> *</em><a name="8" href="#8">8</a> <em class="comment"> * Copyright (C) 2005 Internet Archive.</em><a name="9" href="#9">9</a> <em class="comment"> *</em><a name="10" href="#10">10</a> <em class="comment"> * This file is part of the Heritrix web crawler (crawler.archive.org).</em><a name="11" href="#11">11</a> <em class="comment"> *</em><a name="12" href="#12">12</a> <em class="comment"> * Heritrix is free software; you can redistribute it and/or modify</em><a name="13" href="#13">13</a> <em class="comment"> * it under the terms of the GNU Lesser Public License as published by</em><a name="14" href="#14">14</a> <em class="comment"> * the Free Software Foundation; either version 2.1 of the License, or</em><a name="15" href="#15">15</a> <em class="comment"> * any later version.</em><a name="16" href="#16">16</a> <em class="comment"> *</em><a name="17" href="#17">17</a> <em class="comment"> * Heritrix is distributed in the hope that it will be useful,</em><a name="18" href="#18">18</a> <em class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</em><a name="19" href="#19">19</a> <em class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</em><a name="20" href="#20">20</a> <em class="comment"> * GNU Lesser Public License for more details.</em><a name="21" href="#21">21</a> <em class="comment"> *</em><a name="22" href="#22">22</a> <em class="comment"> * You should have received a copy of the GNU Lesser Public License</em><a name="23" href="#23">23</a> <em class="comment"> * along with Heritrix; if not, write to the Free Software</em><a name="24" href="#24">24</a> <em class="comment"> * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA</em><a name="25" href="#25">25</a> <em class="comment"> */</em><a name="26" href="#26">26</a> <a name="27" href="#27">27</a> <strong>package</strong> <a href="../../../../org/archive/crawler/extractor/package-summary.html">org.archive.crawler.extractor</a>;<a name="28" href="#28">28</a> <a name="29" href="#29">29</a> <strong>import</strong> java.io.IOException;<a name="30" href="#30">30</a> <strong>import</strong> java.util.logging.Logger;<a name="31" href="#31">31</a> <strong>import</strong> java.util.regex.Matcher;<a name="32" href="#32">32</a> <a name="33" href="#33">33</a> <strong>import</strong> org.apache.commons.httpclient.URIException;<a name="34" href="#34">34</a> <strong>import</strong> org.archive.crawler.datamodel.CoreAttributeConstants;<a name="35" href="#35">35</a> <strong>import</strong> org.archive.crawler.datamodel.CrawlURI;<a name="36" href="#36">36</a> <strong>import</strong> org.archive.crawler.framework.CrawlController;<a name="37" href="#37">37</a> <strong>import</strong> org.archive.io.ReplayCharSequence;<a name="38" href="#38">38</a> <strong>import</strong> org.archive.net.UURI;<a name="39" href="#39">39</a> <strong>import</strong> org.archive.util.DevUtils;<a name="40" href="#40">40</a> <strong>import</strong> org.archive.util.TextUtils;<a name="41" href="#41">41</a> <a name="42" href="#42">42</a> <em>/**<em>*</em></em><a name="43" href="#43">43</a> <em> * A simple extractor which finds HTTP URIs inside XML/RSS files,</em><a name="44" href="#44">44</a> <em> * inside attribute values and simple elements (those with only</em><a name="45" href="#45">45</a> <em> * whitespace + HTTP URI + whitespace as contents)</em><a name="46" href="#46">46</a> <em> *</em><a name="47" href="#47">47</a> <em> * @author gojomo</em><a name="48" href="#48">48</a> <em> *</em><a name="49" href="#49">49</a> <em> **/</em><a name="50" href="#50">50</a> <a name="51" href="#51">51</a> <strong>public</strong> <strong>class</strong> <a href="../../../../org/archive/crawler/extractor/ExtractorXML.html">ExtractorXML</a> <strong>extends</strong> <a href="../../../../org/archive/crawler/extractor/Extractor.html">Extractor</a> implements <a href="../../../../org/archive/crawler/datamodel/CoreAttributeConstants.html">CoreAttributeConstants</a> {<a name="52" href="#52">52</a> <strong>private</strong> <strong>static</strong> Logger logger =<a name="53" href="#53">53</a> Logger.getLogger(ExtractorXML.<strong>class</strong>.getName());<a name="54" href="#54">54</a> <a name="55" href="#55">55</a> <strong>private</strong> <strong>static</strong> String ESCAPED_AMP = <span class="string">"&amp"</span>;<a name="56" href="#56">56</a> <a name="57" href="#57">57</a> <strong>static</strong> <strong>final</strong> String XML_URI_EXTRACTOR = <a name="58" href="#58">58</a> <span class="string">"(?i)[\"\'>]//s*(http:[^//s\"\'<>]+)//s*[\"\'<]"</span>; <a name="59" href="#59">59</a> <em class="comment">// GROUPS:</em><a name="60" href="#60">60</a> <em class="comment">// (G1) URI</em><a name="61" href="#61">61</a> <a name="62" href="#62">62</a> <strong>private</strong> <strong>long</strong> numberOfCURIsHandled = 0;<a name="63" href="#63">63</a> <strong>private</strong> <strong>long</strong> numberOfLinksExtracted = 0;<a name="64" href="#64">64</a> <a name="65" href="#65">65</a> <em>/**<em>*</em></em><a name="66" href="#66">66</a> <em> * @param name</em><a name="67" href="#67">67</a> <em> */</em><a name="68" href="#68">68</a> <strong>public</strong> <a href="../../../../org/archive/crawler/extractor/ExtractorXML.html">ExtractorXML</a>(String name) {<a name="69" href="#69">69</a> <strong>super</strong>(name, <span class="string">"XML Extractor. Extracts links from XML/RSS."</span>);<a name="70" href="#70">70</a> }<a name="71" href="#71">71</a> <a name="72" href="#72">72</a> <em>/**<em>*</em></em><a name="73" href="#73">73</a> <em> * @param curi Crawl URI to process.</em><a name="74" href="#74">74</a> <em> */</em><a name="75" href="#75">75</a> <strong>public</strong> <strong>void</strong> extract(<a href="../../../../org/archive/crawler/datamodel/CrawlURI.html">CrawlURI</a> curi) {<a name="76" href="#76">76</a> <strong>if</strong> (!isHttpTransactionContentToProcess(curi)) {<a name="77" href="#77">77</a> <strong>return</strong>;<a name="78" href="#78">78</a> }<a name="79" href="#79">79</a> String mimeType = curi.getContentType();<a name="80" href="#80">80</a> <strong>if</strong> (mimeType == <strong>null</strong>) {<a name="81" href="#81">81</a> <strong>return</strong>;<a name="82" href="#82">82</a> }<a name="83" href="#83">83</a> <strong>if</strong> ((mimeType.toLowerCase().indexOf(<span class="string">"xml"</span>) < 0) <a name="84" href="#84">84</a> && (!curi.toString().toLowerCase().endsWith(<span class="string">".rss"</span>))<a name="85" href="#85">85</a> && (!curi.toString().toLowerCase().endsWith(<span class="string">".xml"</span>))) {<a name="86" href="#86">86</a> <strong>return</strong>;<a name="87" href="#87">87</a> }<a name="88" href="#88">88</a> <strong>this</strong>.numberOfCURIsHandled++;<a name="89" href="#89">89</a> <a name="90" href="#90">90</a> <a href="../../../../org/archive/io/ReplayCharSequence.html">ReplayCharSequence</a> cs = <strong>null</strong>;<a name="91" href="#91">91</a> <strong>try</strong> {<a name="92" href="#92">92</a> cs = curi.getHttpRecorder().getReplayCharSequence();<a name="93" href="#93">93</a> } <strong>catch</strong> (IOException e) {<a name="94" href="#94">94</a> logger.severe(<span class="string">"Failed getting ReplayCharSequence: "</span> + e.getMessage());<a name="95" href="#95">95</a> }<a name="96" href="#96">96</a> <strong>if</strong> (cs == <strong>null</strong>) {<a name="97" href="#97">97</a> logger.severe(<span class="string">"Failed getting ReplayCharSequence: "</span> +<a name="98" href="#98">98</a> curi.toString());<a name="99" href="#99">99</a> <strong>return</strong>;<a name="100" href="#100">100</a> }<a name="101" href="#101">101</a> <strong>try</strong> {<a name="102" href="#102">102</a> <strong>this</strong>.numberOfLinksExtracted += processXml(curi, cs,<a name="103" href="#103">103</a> getController());<a name="104" href="#104">104</a> <em class="comment">// Set flag to indicate that link extraction is completed.</em><a name="105" href="#105">105</a> curi.linkExtractorFinished();<a name="106" href="#106">106</a> } <strong>finally</strong> {<a name="107" href="#107">107</a> <strong>if</strong> (cs != <strong>null</strong>) {<a name="108" href="#108">108</a> <strong>try</strong> {<a name="109" href="#109">109</a> cs.close();<a name="110" href="#110">110</a> } <strong>catch</strong> (IOException ioe) {<a name="111" href="#111">111</a> logger.warning(TextUtils.exceptionToString(<a name="112" href="#112">112</a> <span class="string">"Failed close of ReplayCharSequence."</span>, ioe));<a name="113" href="#113">113</a> }<a name="114" href="#114">114</a> }<a name="115" href="#115">115</a> }<a name="116" href="#116">116</a> }<a name="117" href="#117">117</a> <a name="118" href="#118">118</a> <strong>public</strong> <strong>static</strong> <strong>long</strong> processXml(<a href="../../../../org/archive/crawler/datamodel/CrawlURI.html">CrawlURI</a> curi, CharSequence cs,<a name="119" href="#119">119</a> <a href="../../../../org/archive/crawler/framework/CrawlController.html">CrawlController</a> controller) {<a name="120" href="#120">120</a> <strong>long</strong> foundLinks = 0;<a name="121" href="#121">121</a> Matcher uris = <strong>null</strong>;<a name="122" href="#122">122</a> String xmlUri;<a name="123" href="#123">123</a> uris = TextUtils.getMatcher(XML_URI_EXTRACTOR, cs);<a name="124" href="#124">124</a> <strong>while</strong> (uris.find()) {<a name="125" href="#125">125</a> xmlUri = uris.group(1);<a name="126" href="#126">126</a> <em class="comment">// TODO: Escape more HTML Entities.</em><a name="127" href="#127">127</a> xmlUri = TextUtils.replaceAll(ESCAPED_AMP, xmlUri, <span class="string">"&"</span>);<a name="128" href="#128">128</a> foundLinks++;<a name="129" href="#129">129</a> <strong>try</strong> {<a name="130" href="#130">130</a> <em class="comment">// treat as speculative, as whether context really </em><a name="131" href="#131">131</a> <em class="comment">// intends to create a followable/fetchable URI is</em><a name="132" href="#132">132</a> <em class="comment">// unknown</em><a name="133" href="#133">133</a> curi.createAndAddLink(xmlUri,Link.SPECULATIVE_MISC,<a name="134" href="#134">134</a> Link.SPECULATIVE_HOP);<a name="135" href="#135">135</a> } <strong>catch</strong> (URIException e) {<a name="136" href="#136">136</a> <em class="comment">// There may not be a controller (e.g. If we're being run</em><a name="137" href="#137">137</a> <em class="comment">// by the extractor tool).</em><a name="138" href="#138">138</a> <strong>if</strong> (controller != <strong>null</strong>) {<a name="139" href="#139">139</a> controller.logUriError(e, curi.getUURI(), xmlUri);<a name="140" href="#140">140</a> } <strong>else</strong> {<a name="141" href="#141">141</a> logger.info(curi + <span class="string">", "</span> + xmlUri + <span class="string">": "</span> +<a name="142" href="#142">142</a> e.getMessage());<a name="143" href="#143">143</a> }<a name="144" href="#144">144</a> }<a name="145" href="#145">145</a> }<a name="146" href="#146">146</a> TextUtils.recycleMatcher(uris);<a name="147" href="#147">147</a> <strong>return</strong> foundLinks;<a name="148" href="#148">148</a> }<a name="149" href="#149">149</a> <a name="150" href="#150">150</a> <strong>public</strong> String report() {<a name="151" href="#151">151</a> StringBuffer ret = <strong>new</strong> StringBuffer();<a name="152" href="#152">152</a> ret.append(<span class="string">"Processor: org.archive.crawler.extractor.ExtractorXML\n"</span>);<a name="153" href="#153">153</a> ret.append(<span class="string">" Function: Link extraction on XML/RSS\n"</span>);<a name="154" href="#154">154</a> ret.append(<span class="string">" CrawlURIs handled: "</span> + numberOfCURIsHandled + <span class="string">"\n"</span>);<a name="155" href="#155">155</a> ret.append(<span class="string">" Links extracted: "</span> + numberOfLinksExtracted + <span class="string">"\n\n"</span>);<a name="156" href="#156">156</a> <a name="157" href="#157">157</a> <strong>return</strong> ret.toString();<a name="158" href="#158">158</a> }<a name="159" href="#159">159</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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