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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>SurtPrefixSet xref</title><link type="text/css" rel="stylesheet" href="../../../stylesheet.css" /></head><body><div id="overview"><a href="../../../../apidocs/org/archive/util/SurtPrefixSet.html">View Javadoc</a></div><pre><a name="1" href="#1">1</a> <em class="comment">/*<em class="comment"> SURTPrefixSet</em></em><a name="2" href="#2">2</a> <em class="comment">*</em><a name="3" href="#3">3</a> <em class="comment">* $Id: SurtPrefixSet.java,v 1.20 2006/08/15 00:25:03 paul_jack 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 23, 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.FileWriter;<a name="33" href="#33">33</a> <strong>import</strong> java.io.IOException;<a name="34" href="#34">34</a> <strong>import</strong> java.io.InputStream;<a name="35" href="#35">35</a> <strong>import</strong> java.io.InputStreamReader;<a name="36" href="#36">36</a> <strong>import</strong> java.io.PrintStream;<a name="37" href="#37">37</a> <strong>import</strong> java.io.Reader;<a name="38" href="#38">38</a> <strong>import</strong> java.util.Iterator;<a name="39" href="#39">39</a> <strong>import</strong> java.util.SortedSet;<a name="40" href="#40">40</a> <strong>import</strong> java.util.TreeSet;<a name="41" href="#41">41</a> <a name="42" href="#42">42</a> <strong>import</strong> org.apache.commons.httpclient.URIException;<a name="43" href="#43">43</a> <strong>import</strong> org.archive.net.UURI;<a name="44" href="#44">44</a> <strong>import</strong> org.archive.net.UURIFactory;<a name="45" href="#45">45</a> <strong>import</strong> org.archive.util.iterator.LineReadingIterator;<a name="46" href="#46">46</a> <strong>import</strong> org.archive.util.iterator.RegexpLineIterator;<a name="47" href="#47">47</a> <a name="48" href="#48">48</a> <em>/**<em>*</em></em><a name="49" href="#49">49</a> <em> * Specialized TreeSet for keeping a set of String prefixes. </em><a name="50" href="#50">50</a> <em> * </em><a name="51" href="#51">51</a> <em> * Redundant prefixes (those that are themselves prefixed</em><a name="52" href="#52">52</a> <em> * by other set entries) are eliminated.</em><a name="53" href="#53">53</a> <em> * </em><a name="54" href="#54">54</a> <em> * @author gojomo</em><a name="55" href="#55">55</a> <em> */</em><a name="56" href="#56">56</a> <strong>public</strong> <strong>class</strong> <a href="../../../org/archive/util/SurtPrefixSet.html">SurtPrefixSet</a> <strong>extends</strong> TreeSet {<a name="57" href="#57">57</a> <strong>private</strong> <strong>static</strong> <strong>final</strong> String SURT_PREFIX_DIRECTIVE = <span class="string">"+"</span>;<a name="58" href="#58">58</a> <a name="59" href="#59">59</a> <em>/**<em>*</em></em><a name="60" href="#60">60</a> <em> * Test whether the given String is prefixed by one</em><a name="61" href="#61">61</a> <em> * of this set's entries. </em><a name="62" href="#62">62</a> <em> * </em><a name="63" href="#63">63</a> <em> * @param s</em><a name="64" href="#64">64</a> <em> * @return True if contains prefix.</em><a name="65" href="#65">65</a> <em> */</em><a name="66" href="#66">66</a> <strong>public</strong> <strong>boolean</strong> containsPrefixOf(String s) {<a name="67" href="#67">67</a> SortedSet sub = headSet(s);<a name="68" href="#68">68</a> <em class="comment">// because redundant prefixes have been eliminated,</em><a name="69" href="#69">69</a> <em class="comment">// only a test against last item in headSet is necessary</em><a name="70" href="#70">70</a> <strong>if</strong> (!sub.isEmpty() && s.startsWith((String)sub.last())) {<a name="71" href="#71">71</a> <strong>return</strong> <strong>true</strong>; <em class="comment">// prefix substring exists</em><a name="72" href="#72">72</a> } <em class="comment">// else: might still exist exactly (headSet does not contain boundary)</em><a name="73" href="#73">73</a> <strong>return</strong> contains(s); <em class="comment">// exact string exists, or no prefix is there</em><a name="74" href="#74">74</a> }<a name="75" href="#75">75</a> <a name="76" href="#76">76</a> <em>/**<em>* </em></em><a name="77" href="#77">77</a> <em> * Maintains additional invariant: if one entry is a </em><a name="78" href="#78">78</a> <em> * prefix of another, keep only the prefix. </em><a name="79" href="#79">79</a> <em> * </em><a name="80" href="#80">80</a> <em> * @see java.util.Collection#add(java.lang.Object)</em><a name="81" href="#81">81</a> <em> */</em><a name="82" href="#82">82</a> <strong>public</strong> <strong>boolean</strong> add(Object o) {<a name="83" href="#83">83</a> String s = (String) o;<a name="84" href="#84">84</a> SortedSet sub = headSet(s);<a name="85" href="#85">85</a> <strong>if</strong> (!sub.isEmpty() && s.startsWith((String)sub.last())) {<a name="86" href="#86">86</a> <em class="comment">// no need to add; prefix is already present</em><a name="87" href="#87">87</a> <strong>return</strong> false;<a name="88" href="#88">88</a> }<a name="89" href="#89">89</a> <strong>boolean</strong> retVal = <strong>super</strong>.add(s);<a name="90" href="#90">90</a> sub = tailSet(s+<span class="string">"\0"</span>);<a name="91" href="#91">91</a> <strong>while</strong>(!sub.isEmpty() && ((String)sub.first()).startsWith(s)) {<a name="92" href="#92">92</a> <em class="comment">// remove redundant entries</em><a name="93" href="#93">93</a> sub.remove(sub.first());<a name="94" href="#94">94</a> }<a name="95" href="#95">95</a> <strong>return</strong> retVal;<a name="96" href="#96">96</a> }<a name="97" href="#97">97</a> <a name="98" href="#98">98</a> <a name="99" href="#99">99</a> <em>/**<em>*</em></em><a name="100" href="#100">100</a> <em> * Read a set of SURT prefixes from a reader source; keep sorted and </em><a name="101" href="#101">101</a> <em> * with redundant entries removed.</em><a name="102" href="#102">102</a> <em> * </em><a name="103" href="#103">103</a> <em> * @param r reader over file of SURT_format strings</em><a name="104" href="#104">104</a> <em> * @throws IOException</em><a name="105" href="#105">105</a> <em> */</em><a name="106" href="#106">106</a> <strong>public</strong> <strong>void</strong> importFrom(Reader r) {<a name="107" href="#107">107</a> BufferedReader reader = <strong>new</strong> BufferedReader(r);<a name="108" href="#108">108</a> String s;<a name="109" href="#109">109</a> <a name="110" href="#110">110</a> Iterator iter = <a name="111" href="#111">111</a> <strong>new</strong> <a href="../../../org/archive/util/iterator/RegexpLineIterator.html">RegexpLineIterator</a>(<a name="112" href="#112">112</a> <strong>new</strong> <a href="../../../org/archive/util/iterator/LineReadingIterator.html">LineReadingIterator</a>(reader),<a name="113" href="#113">113</a> RegexpLineIterator.COMMENT_LINE,<a name="114" href="#114">114</a> RegexpLineIterator.NONWHITESPACE_ENTRY_TRAILING_COMMENT,<a name="115" href="#115">115</a> RegexpLineIterator.ENTRY);<a name="116" href="#116">116</a> <a name="117" href="#117">117</a> <strong>while</strong> (iter.hasNext()) {<a name="118" href="#118">118</a> s = (String) iter.next();<a name="119" href="#119">119</a> add(s.toLowerCase());<a name="120" href="#120">120</a> }<a name="121" href="#121">121</a> }<a name="122" href="#122">122</a> <a name="123" href="#123">123</a> <em>/**<em>*</em></em><a name="124" href="#124">124</a> <em> * @param r Where to read from.</em><a name="125" href="#125">125</a> <em> */</em><a name="126" href="#126">126</a> <strong>public</strong> <strong>void</strong> importFromUris(Reader r) {<a name="127" href="#127">127</a> BufferedReader reader = <strong>new</strong> BufferedReader(r);<a name="128" href="#128">128</a> String s;<a name="129" href="#129">129</a> <a name="130" href="#130">130</a> Iterator iter = <a name="131" href="#131">131</a> <strong>new</strong> <a href="../../../org/archive/util/iterator/RegexpLineIterator.html">RegexpLineIterator</a>(⌨️ 快捷键说明
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