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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>SURT xref</title><link type="text/css" rel="stylesheet" href="../../../stylesheet.css" /></head><body><div id="overview"><a href="../../../../apidocs/org/archive/util/SURT.html">View Javadoc</a></div><pre><a name="1" href="#1">1</a> <em class="comment">/*<em class="comment"> SURT</em></em><a name="2" href="#2">2</a> <em class="comment">*</em><a name="3" href="#3">3</a> <em class="comment">* $Id: SURT.java,v 1.12 2005/11/12 00:32:53 gojomo Exp $</em><a name="4" href="#4">4</a> <em class="comment">*</em><a name="5" href="#5">5</a> <em class="comment">* Created on Jul 16, 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/util/package-summary.html">org.archive.util</a>;<a name="26" href="#26">26</a> <a name="27" href="#27">27</a> <strong>import</strong> java.io.BufferedInputStream;<a name="28" href="#28">28</a> <strong>import</strong> java.io.BufferedOutputStream;<a name="29" href="#29">29</a> <strong>import</strong> java.io.BufferedReader;<a name="30" href="#30">30</a> <strong>import</strong> java.io.FileInputStream;<a name="31" href="#31">31</a> <strong>import</strong> java.io.FileOutputStream;<a name="32" href="#32">32</a> <strong>import</strong> java.io.IOException;<a name="33" href="#33">33</a> <strong>import</strong> java.io.InputStream;<a name="34" href="#34">34</a> <strong>import</strong> java.io.InputStreamReader;<a name="35" href="#35">35</a> <strong>import</strong> java.io.PrintStream;<a name="36" href="#36">36</a> <strong>import</strong> java.util.regex.Matcher;<a name="37" href="#37">37</a> <a name="38" href="#38">38</a> <em>/**<em>*</em></em><a name="39" href="#39">39</a> <em> * Sort-friendly URI Reordering Transform.</em><a name="40" href="#40">40</a> <em> * </em><a name="41" href="#41">41</a> <em> * Converts URIs of the form:</em><a name="42" href="#42">42</a> <em> * </em><a name="43" href="#43">43</a> <em> * scheme://userinfo@domain.tld:port/path?query#fragment</em><a name="44" href="#44">44</a> <em> * </em><a name="45" href="#45">45</a> <em> * ...into...</em><a name="46" href="#46">46</a> <em> * </em><a name="47" href="#47">47</a> <em> * scheme://(tld,domain,:port@userinfo)/path?query#fragment</em><a name="48" href="#48">48</a> <em> * </em><a name="49" href="#49">49</a> <em> * The '(' ')' characters serve as an unambiguous notice that the so-called </em><a name="50" href="#50">50</a> <em> * 'authority' portion of the URI ([userinfo@]host[:port] in http URIs) has </em><a name="51" href="#51">51</a> <em> * been transformed; the commas prevent confusion with regular hostnames.</em><a name="52" href="#52">52</a> <em> * </em><a name="53" href="#53">53</a> <em> * This remedies the 'problem' with standard URIs that the host portion of a </em><a name="54" href="#54">54</a> <em> * regular URI, with its dotted-domains, is actually in reverse order from </em><a name="55" href="#55">55</a> <em> * the natural hierarchy that's usually helpful for grouping and sorting.</em><a name="56" href="#56">56</a> <em> * </em><a name="57" href="#57">57</a> <em> * The value of respecting URI case variance is considered negligible: it</em><a name="58" href="#58">58</a> <em> * is vanishingly rare for case-variance to be meaningful, while URI case-</em><a name="59" href="#59">59</a> <em> * variance often arises from people's confusion or sloppiness, and they</em><a name="60" href="#60">60</a> <em> * only correct it insofar as necessary to avoid blatant problems. Thus </em><a name="61" href="#61">61</a> <em> * SURT form is considered to be flattened to all lowercase, and thus not</em><a name="62" href="#62">62</a> <em> * completely reversible. </em><a name="63" href="#63">63</a> <em> * </em><a name="64" href="#64">64</a> <em> * @author gojomo</em><a name="65" href="#65">65</a> <em> */</em><a name="66" href="#66">66</a> <strong>public</strong> <strong>class</strong> <a href="../../../org/archive/util/SURT.html">SURT</a> {<a name="67" href="#67">67</a> <strong>static</strong> <strong>char</strong> DOT = '.';<a name="68" href="#68">68</a> <strong>static</strong> String BEGIN_TRANSFORMED_AUTHORITY = <span class="string">"("</span>;<a name="69" href="#69">69</a> <strong>static</strong> String TRANSFORMED_HOST_DELIM = <span class="string">","</span>;<a name="70" href="#70">70</a> <strong>static</strong> String END_TRANSFORMED_AUTHORITY = <span class="string">")"</span>;<a name="71" href="#71">71</a> <a name="72" href="#72">72</a> <em class="comment">// 1: scheme://</em><a name="73" href="#73">73</a> <em class="comment">// 2: userinfo (if present)</em><a name="74" href="#74">74</a> <em class="comment">// 3: @ (if present)</em><a name="75" href="#75">75</a> <em class="comment">// 4: host</em><a name="76" href="#76">76</a> <em class="comment">// 5: :port</em><a name="77" href="#77">77</a> <em class="comment">// 6: path</em><a name="78" href="#78">78</a> <strong>static</strong> String URI_SPLITTER = <a name="79" href="#79">79</a> <span class="string">"^(//w+://)(?:([-//w//.!~//*'//(//)%;:&=+$,]+?)(@))?(//S+?)(://d+)?(///S*)?$"</span>;<a name="80" href="#80">80</a> <em class="comment">// 1 2 3 4 5 6</em><a name="81" href="#81">81</a> <a name="82" href="#82">82</a> <em class="comment">// RFC2396 </em><a name="83" href="#83">83</a> <em class="comment">// reserved = ";" | "/" | "?" | ":" | "@" | "&" | "=" | "+" |</em><a name="84" href="#84">84</a> <em class="comment">// "$" | ","</em><a name="85" href="#85">85</a> <em class="comment">// unreserved = alphanum | mark</em><a name="86" href="#86">86</a> <em class="comment">// mark = "-" | "_" | "." | "!" | "~" | "*" | "'" | "(" | ")"</em><a name="87" href="#87">87</a> <em class="comment">// userinfo = *( unreserved | escaped |</em><a name="88" href="#88">88</a> <em class="comment">// ";" | ":" | "&" | "=" | "+" | "$" | "," )</em><a name="89" href="#89">89</a> <em class="comment">// escaped = "%" hex hex</em>⌨️ 快捷键说明
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