📄 regexrule.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>RegexRule xref</title><link type="text/css" rel="stylesheet" href="../../../../../stylesheet.css" /></head><body><div id="overview"><a href="../../../../../../apidocs/org/archive/crawler/url/canonicalize/RegexRule.html">View Javadoc</a></div><pre><a name="1" href="#1">1</a> <em class="comment">/*<em class="comment"> RegexRule</em></em><a name="2" href="#2">2</a> <em class="comment"> * </em><a name="3" href="#3">3</a> <em class="comment"> * Created on Oct 6, 2004</em><a name="4" href="#4">4</a> <em class="comment"> *</em><a name="5" href="#5">5</a> <em class="comment"> * Copyright (C) 2004 Internet Archive.</em><a name="6" href="#6">6</a> <em class="comment"> * </em><a name="7" href="#7">7</a> <em class="comment"> * This file is part of the Heritrix web crawler (crawler.archive.org).</em><a name="8" href="#8">8</a> <em class="comment"> * </em><a name="9" href="#9">9</a> <em class="comment"> * Heritrix is free software; you can redistribute it and/or modify</em><a name="10" href="#10">10</a> <em class="comment"> * it under the terms of the GNU Lesser Public License as published by</em><a name="11" href="#11">11</a> <em class="comment"> * the Free Software Foundation; either version 2.1 of the License, or</em><a name="12" href="#12">12</a> <em class="comment"> * any later version.</em><a name="13" href="#13">13</a> <em class="comment"> * </em><a name="14" href="#14">14</a> <em class="comment"> * Heritrix is distributed in the hope that it will be useful, </em><a name="15" href="#15">15</a> <em class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</em><a name="16" href="#16">16</a> <em class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</em><a name="17" href="#17">17</a> <em class="comment"> * GNU Lesser Public License for more details.</em><a name="18" href="#18">18</a> <em class="comment"> * </em><a name="19" href="#19">19</a> <em class="comment"> * You should have received a copy of the GNU Lesser Public License</em><a name="20" href="#20">20</a> <em class="comment"> * along with Heritrix; if not, write to the Free Software</em><a name="21" href="#21">21</a> <em class="comment"> * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA</em><a name="22" href="#22">22</a> <em class="comment"> */</em><a name="23" href="#23">23</a> <strong>package</strong> <a href="../../../../../org/archive/crawler/url/canonicalize/package-summary.html">org.archive.crawler.url.canonicalize</a>;<a name="24" href="#24">24</a> <a name="25" href="#25">25</a> <strong>import</strong> java.util.logging.Logger;<a name="26" href="#26">26</a> <strong>import</strong> java.util.regex.Matcher;<a name="27" href="#27">27</a> <a name="28" href="#28">28</a> <strong>import</strong> org.archive.crawler.settings.SimpleType;<a name="29" href="#29">29</a> <strong>import</strong> org.archive.util.TextUtils;<a name="30" href="#30">30</a> <a name="31" href="#31">31</a> <em>/**<em>*</em></em><a name="32" href="#32">32</a> <em> * General conversion rule.</em><a name="33" href="#33">33</a> <em> * @author stack</em><a name="34" href="#34">34</a> <em> * @version $Date: 2005/11/11 22:29:53 $, $Revision: 1.7 $</em><a name="35" href="#35">35</a> <em> */</em><a name="36" href="#36">36</a> <strong>public</strong> <strong>class</strong> <a href="../../../../../org/archive/crawler/url/canonicalize/RegexRule.html">RegexRule</a><a name="37" href="#37">37</a> <strong>extends</strong> <a href="../../../../../org/archive/crawler/url/canonicalize/BaseRule.html">BaseRule</a> {<a name="38" href="#38">38</a> <strong>protected</strong> <strong>static</strong> Logger logger =<a name="39" href="#39">39</a> Logger.getLogger(BaseRule.<strong>class</strong>.getName());<a name="40" href="#40">40</a> <strong>private</strong> <strong>static</strong> <strong>final</strong> String DESCRIPTION = <span class="string">"General regex rule. "</span> +<a name="41" href="#41">41</a> <span class="string">"Specify a matching regex and a format string used outputting"</span> +<a name="42" href="#42">42</a> <span class="string">" result if a match was found. If problem compiling regex or"</span> +<a name="43" href="#43">43</a> <span class="string">" interpreting format, problem is logged, and this rule does"</span> +<a name="44" href="#44">44</a> <span class="string">" nothing. See User Manual for example usage."</span>;<a name="45" href="#45">45</a> <strong>private</strong> <strong>static</strong> <strong>final</strong> String ATTR_REGEX = <span class="string">"matching-regex"</span>;<a name="46" href="#46">46</a> <strong>private</strong> <strong>static</strong> <strong>final</strong> String ATTR_FORMAT = <span class="string">"format"</span>;<a name="47" href="#47">47</a> <strong>private</strong> <strong>static</strong> <strong>final</strong> String ATTR_COMMENT = <span class="string">"comment"</span>;<a name="48" href="#48">48</a> <a name="49" href="#49">49</a> <strong>public</strong> <a href="../../../../../org/archive/crawler/url/canonicalize/RegexRule.html">RegexRule</a>(String name) {<a name="50" href="#50">50</a> <strong>this</strong>(name, <span class="string">"(.*)"</span>, <span class="string">"${1}"</span>);<a name="51" href="#51">51</a> }<a name="52" href="#52">52</a> <a name="53" href="#53">53</a> <strong>protected</strong> <a href="../../../../../org/archive/crawler/url/canonicalize/RegexRule.html">RegexRule</a>(String name, String defaultRegex,<a name="54" href="#54">54</a> String defaultFormat) {<a name="55" href="#55">55</a> <strong>super</strong>(name, DESCRIPTION);<a name="56" href="#56">56</a> addElementToDefinition(<strong>new</strong> <a href="../../../../../org/archive/crawler/settings/SimpleType.html">SimpleType</a>(ATTR_REGEX,<a name="57" href="#57">57</a> <span class="string">"Java regular expression. If the regex matches, we'll rewrite"</span> +<a name="58" href="#58">58</a> <span class="string">" the passed url using the specified format pattern."</span>,<a name="59" href="#59">59</a> defaultRegex));<a name="60" href="#60">60</a> addElementToDefinition(<a name="61" href="#61">61</a> <strong>new</strong> <a href="../../../../../org/archive/crawler/settings/SimpleType.html">SimpleType</a>(ATTR_FORMAT, <span class="string">"Pattern to use rewriting matched"</span> +<a name="62" href="#62">62</a> <span class="string">"url. Use '${1}' to match first regex group, '${2}' for"</span> +<a name="63" href="#63">63</a> <span class="string">"next group, etc."</span>, defaultFormat));<a name="64" href="#64">64</a> addElementToDefinition(<strong>new</strong> <a href="../../../../../org/archive/crawler/settings/SimpleType.html">SimpleType</a>(ATTR_COMMENT,<a name="65" href="#65">65</a> <span class="string">"Free-text comment on why this rule was added."</span>, <span class="string">""</span>));<a name="66" href="#66">66</a> }<a name="67" href="#67">67</a> <a name="68" href="#68">68</a> <strong>public</strong> String canonicalize(String url, Object context) {<a name="69" href="#69">69</a> String regex = getNullOrAttribute(ATTR_REGEX, context);<a name="70" href="#70">70</a> <strong>if</strong> (regex == <strong>null</strong>) {<a name="71" href="#71">71</a> <strong>return</strong> url;<a name="72" href="#72">72</a> }<a name="73" href="#73">73</a> String format = getNullOrAttribute(ATTR_FORMAT, context);<a name="74" href="#74">74</a> <strong>if</strong> (format == <strong>null</strong>) {<a name="75" href="#75">75</a> <strong>return</strong> url;<a name="76" href="#76">76</a> }<a name="77" href="#77">77</a> Matcher matcher = TextUtils.getMatcher(regex, url);<a name="78" href="#78">78</a> String retVal; <a name="79" href="#79">79</a> <strong>if</strong> (matcher == <strong>null</strong> || !matcher.matches()) {<a name="80" href="#80">80</a> retVal = url;<a name="81" href="#81">81</a> } <strong>else</strong> {<a name="82" href="#82">82</a> StringBuffer buffer = <strong>new</strong> StringBuffer(url.length() * 2);⌨️ 快捷键说明
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