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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>UURIFactory xref</title><link type="text/css" rel="stylesheet" href="../../../stylesheet.css" /></head><body><div id="overview"><a href="../../../../apidocs/org/archive/net/UURIFactory.html">View Javadoc</a></div><pre><a name="1" href="#1">1</a> <em class="comment">/*<em class="comment"> UURIFactory</em></em><a name="2" href="#2">2</a> <em class="comment"> *</em><a name="3" href="#3">3</a> <em class="comment"> * $Id: UURIFactory.java,v 1.12 2006/07/18 00:40:16 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 July 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) 2003 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/net/package-summary.html">org.archive.net</a>;<a name="26" href="#26">26</a> <a name="27" href="#27">27</a> <strong>import</strong> gnu.inet.encoding.IDNA;<a name="28" href="#28">28</a> <strong>import</strong> gnu.inet.encoding.IDNAException;<a name="29" href="#29">29</a> <strong>import</strong> it.unimi.dsi.mg4j.util.MutableString;<a name="30" href="#30">30</a> <a name="31" href="#31">31</a> <strong>import</strong> java.io.UnsupportedEncodingException;<a name="32" href="#32">32</a> <strong>import</strong> java.util.Arrays;<a name="33" href="#33">33</a> <strong>import</strong> java.util.BitSet;<a name="34" href="#34">34</a> <strong>import</strong> java.util.logging.Level;<a name="35" href="#35">35</a> <strong>import</strong> java.util.logging.Logger;<a name="36" href="#36">36</a> <strong>import</strong> java.util.regex.Matcher;<a name="37" href="#37">37</a> <strong>import</strong> java.util.regex.Pattern;<a name="38" href="#38">38</a> <a name="39" href="#39">39</a> <strong>import</strong> org.apache.commons.httpclient.URI;<a name="40" href="#40">40</a> <strong>import</strong> org.apache.commons.httpclient.URIException;<a name="41" href="#41">41</a> <strong>import</strong> org.archive.util.TextUtils;<a name="42" href="#42">42</a> <a name="43" href="#43">43</a> <a name="44" href="#44">44</a> <em>/**<em>*</em></em><a name="45" href="#45">45</a> <em> * Factory that returns UURIs.</em><a name="46" href="#46">46</a> <em> * </em><a name="47" href="#47">47</a> <em> * Does escaping and fixup on URIs massaging in accordance with RFC2396</em><a name="48" href="#48">48</a> <em> * and to match browser practice. For example, it removes any</em><a name="49" href="#49">49</a> <em> * '..' if first thing in the path as per IE, converts backslashes to forward</em><a name="50" href="#50">50</a> <em> * slashes, and discards any 'fragment'/anchor portion of the URI. This</em><a name="51" href="#51">51</a> <em> * class will also fail URIs if they are longer than IE's allowed maximum</em><a name="52" href="#52">52</a> <em> * length.</em><a name="53" href="#53">53</a> <em> * </em><a name="54" href="#54">54</a> <em> * <p>TODO: Test logging.</em><a name="55" href="#55">55</a> <em> * </em><a name="56" href="#56">56</a> <em> * @author stack</em><a name="57" href="#57">57</a> <em> */</em><a name="58" href="#58">58</a> <strong>public</strong> <strong>class</strong> <a href="../../../org/archive/net/UURIFactory.html">UURIFactory</a> <strong>extends</strong> URI {<a name="59" href="#59">59</a> <a name="60" href="#60">60</a> <em>/**<em>*</em></em><a name="61" href="#61">61</a> <em> * Logging instance.</em><a name="62" href="#62">62</a> <em> */</em><a name="63" href="#63">63</a> <strong>private</strong> <strong>static</strong> Logger logger =<a name="64" href="#64">64</a> Logger.getLogger(UURIFactory.<strong>class</strong>.getName());<a name="65" href="#65">65</a> <a name="66" href="#66">66</a> <em>/**<em>*</em></em><a name="67" href="#67">67</a> <em> * The single instance of this factory.</em><a name="68" href="#68">68</a> <em> */</em><a name="69" href="#69">69</a> <strong>private</strong> <strong>static</strong> <strong>final</strong> <a href="../../../org/archive/net/UURIFactory.html">UURIFactory</a> factory = <strong>new</strong> <a href="../../../org/archive/net/UURIFactory.html">UURIFactory</a>();<a name="70" href="#70">70</a> <a name="71" href="#71">71</a> <em>/**<em>*</em></em><a name="72" href="#72">72</a> <em> * RFC 2396-inspired regex.</em><a name="73" href="#73">73</a> <em> *</em><a name="74" href="#74">74</a> <em> * From the RFC Appendix B:</em><a name="75" href="#75">75</a> <em> * <pre></em><a name="76" href="#76">76</a> <em> * URI Generic Syntax August 1998</em><a name="77" href="#77">77</a> <em> *</em><a name="78" href="#78">78</a> <em> * B. Parsing a URI Reference with a Regular Expression</em><a name="79" href="#79">79</a> <em> *</em><a name="80" href="#80">80</a> <em> * As described in Section 4.3, the generic URI syntax is not sufficient</em><a name="81" href="#81">81</a> <em> * to disambiguate the components of some forms of URI. Since the</em><a name="82" href="#82">82</a> <em> * "greedy algorithm" described in that section is identical to the</em><a name="83" href="#83">83</a> <em> * disambiguation method used by POSIX regular expressions, it is</em><a name="84" href="#84">84</a> <em> * natural and commonplace to use a regular expression for parsing the</em><a name="85" href="#85">85</a> <em> * potential four components and fragment identifier of a URI reference.</em><a name="86" href="#86">86</a> <em> *</em><a name="87" href="#87">87</a> <em> * The following line is the regular expression for breaking-down a URI</em><a name="88" href="#88">88</a> <em> * reference into its components.</em><a name="89" href="#89">89</a> <em> *</em><a name="90" href="#90">90</a> <em> * ^(([^:/?#]+):)?(//([^/?#]*))?([^?#]*)(\?([^#]*))?(#(.*))?</em><a name="91" href="#91">91</a> <em> * 12 3 4 5 6 7 8 9</em><a name="92" href="#92">92</a> <em> *</em><a name="93" href="#93">93</a> <em> * The numbers in the second line above are only to assist readability;</em><a name="94" href="#94">94</a> <em> * they indicate the reference points for each subexpression (i.e., each</em><a name="95" href="#95">95</a> <em> * paired parenthesis). We refer to the value matched for subexpression</em><a name="96" href="#96">96</a> <em> * <n> as $<n>. For example, matching the above expression to</em><a name="97" href="#97">97</a> <em> *</em><a name="98" href="#98">98</a> <em> * <a href="http://www.ics.uci.edu/pub/ietf/uri/" target="alexandria_uri">http://www.ics.uci.edu/pub/ietf/uri/</a>#Related</em><a name="99" href="#99">99</a> <em> *</em><a name="100" href="#100">100</a> <em> * results in the following subexpression matches:</em><a name="101" href="#101">101</a> <em> *</em><a name="102" href="#102">102</a> <em> * $1 = http:</em><a name="103" href="#103">103</a> <em> * $2 = http</em><a name="104" href="#104">104</a> <em> * $3 = //www.ics.uci.edu</em><a name="105" href="#105">105</a> <em> * $4 = www.ics.uci.edu</em><a name="106" href="#106">106</a> <em> * $5 = /pub/ietf/uri/</em><a name="107" href="#107">107</a> <em> * $6 = <undefined></em><a name="108" href="#108">108</a> <em> * $7 = <undefined></em><a name="109" href="#109">109</a> <em> * $8 = #Related</em><a name="110" href="#110">110</a> <em> * $9 = Related</em><a name="111" href="#111">111</a> <em> *</em><a name="112" href="#112">112</a> <em> * where <undefined> indicates that the component is not present, as is</em><a name="113" href="#113">113</a> <em> * the case for the query component in the above example. Therefore, we</em><a name="114" href="#114">114</a> <em> * can determine the value of the four components and fragment as</em><a name="115" href="#115">115</a> <em> *</em><a name="116" href="#116">116</a> <em> * scheme = $2</em><a name="117" href="#117">117</a> <em> * authority = $4</em><a name="118" href="#118">118</a> <em> * path = $5</em><a name="119" href="#119">119</a> <em> * query = $7</em><a name="120" href="#120">120</a> <em> * fragment = $9</em><a name="121" href="#121">121</a> <em> * </pre></em><a name="122" href="#122">122</a> <em> *</em><a name="123" href="#123">123</a> <em> * -- </em><a name="124" href="#124">124</a> <em> * <p>Below differs from the rfc regex in that it has java escaping of</em><a name="125" href="#125">125</a> <em> * regex characters and we allow a URI made of a fragment only (Added extra</em><a name="126" href="#126">126</a> <em> * group so indexing is off by one after scheme).</em><a name="127" href="#127">127</a> <em> */</em><a name="128" href="#128">128</a> <strong>final</strong> <strong>static</strong> Pattern RFC2396REGEX = Pattern.compile(<a name="129" href="#129">129</a> <span class="string">"^(([^:/?#]+):)?((//([^/?#]*))?([^?#]*)(//?([^#]*))?)?(#(.*))?"</span>);<a name="130" href="#130">130</a> <em class="comment">// 12 34 5 6 7 8 9 A</em><a name="131" href="#131">131</a> <em class="comment">// 2 1 54 6 87 3 A9</em>⌨️ 快捷键说明
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