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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>CandidateURI xref</title><link type="text/css" rel="stylesheet" href="../../../../stylesheet.css" /></head><body><div id="overview"><a href="../../../../../apidocs/org/archive/crawler/datamodel/CandidateURI.html">View Javadoc</a></div><pre><a name="1" href="#1">1</a> <em class="comment">/*<em class="comment"> Copyright (C) 2003 Internet Archive.</em></em><a name="2" href="#2">2</a> <em class="comment"> *</em><a name="3" href="#3">3</a> <em class="comment"> * This file is part of the Heritrix web crawler (crawler.archive.org).</em><a name="4" href="#4">4</a> <em class="comment"> *</em><a name="5" href="#5">5</a> <em class="comment"> * Heritrix is free software; you can redistribute it and/or modify</em><a name="6" href="#6">6</a> <em class="comment"> * it under the terms of the GNU Lesser Public License as published by</em><a name="7" href="#7">7</a> <em class="comment"> * the Free Software Foundation; either version 2.1 of the License, or</em><a name="8" href="#8">8</a> <em class="comment"> * any later version.</em><a name="9" href="#9">9</a> <em class="comment"> *</em><a name="10" href="#10">10</a> <em class="comment"> * Heritrix is distributed in the hope that it will be useful,</em><a name="11" href="#11">11</a> <em class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</em><a name="12" href="#12">12</a> <em class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</em><a name="13" href="#13">13</a> <em class="comment"> * GNU Lesser Public License for more details.</em><a name="14" href="#14">14</a> <em class="comment"> *</em><a name="15" href="#15">15</a> <em class="comment"> * You should have received a copy of the GNU Lesser Public License</em><a name="16" href="#16">16</a> <em class="comment"> * along with Heritrix; if not, write to the Free Software</em><a name="17" href="#17">17</a> <em class="comment"> * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA</em><a name="18" href="#18">18</a> <em class="comment"> *</em><a name="19" href="#19">19</a> <em class="comment"> * CandidateURI.java</em><a name="20" href="#20">20</a> <em class="comment"> * Created on Sep 30, 2003</em><a name="21" href="#21">21</a> <em class="comment"> *</em><a name="22" href="#22">22</a> <em class="comment"> * $Header$</em><a name="23" href="#23">23</a> <em class="comment"> */</em><a name="24" href="#24">24</a> <strong>package</strong> <a href="../../../../org/archive/crawler/datamodel/package-summary.html">org.archive.crawler.datamodel</a>;<a name="25" href="#25">25</a> <a name="26" href="#26">26</a> <strong>import</strong> java.io.IOException;<a name="27" href="#27">27</a> <strong>import</strong> java.io.ObjectInputStream;<a name="28" href="#28">28</a> <strong>import</strong> java.io.ObjectOutputStream;<a name="29" href="#29">29</a> <strong>import</strong> java.io.PrintWriter;<a name="30" href="#30">30</a> <strong>import</strong> java.io.Serializable;<a name="31" href="#31">31</a> <strong>import</strong> java.util.ArrayList;<a name="32" href="#32">32</a> <strong>import</strong> java.util.Iterator;<a name="33" href="#33">33</a> <strong>import</strong> java.util.List;<a name="34" href="#34">34</a> <a name="35" href="#35">35</a> <strong>import</strong> org.apache.commons.httpclient.URIException;<a name="36" href="#36">36</a> <strong>import</strong> org.archive.crawler.extractor.Link;<a name="37" href="#37">37</a> <strong>import</strong> org.archive.net.UURI;<a name="38" href="#38">38</a> <strong>import</strong> org.archive.net.UURIFactory;<a name="39" href="#39">39</a> <strong>import</strong> org.archive.util.ArchiveUtils;<a name="40" href="#40">40</a> <strong>import</strong> org.archive.util.Reporter;<a name="41" href="#41">41</a> <a name="42" href="#42">42</a> <strong>import</strong> st.ata.util.AList;<a name="43" href="#43">43</a> <strong>import</strong> st.ata.util.HashtableAList;<a name="44" href="#44">44</a> <a name="45" href="#45">45</a> <em>/**<em>*</em></em><a name="46" href="#46">46</a> <em> * A URI, discovered or passed-in, that may be scheduled.</em><a name="47" href="#47">47</a> <em> * When scheduled, a CandidateURI becomes a {@link CrawlURI}</em><a name="48" href="#48">48</a> <em> * made with the data contained herein. A CandidateURI</em><a name="49" href="#49">49</a> <em> * contains just the fields necessary to perform quick in-scope analysis.</em><a name="50" href="#50">50</a> <em> * </em><a name="51" href="#51">51</a> <em> * <p>Has a flexible attribute list that will be promoted into</em><a name="52" href="#52">52</a> <em> * any {@link CrawlURI} created from this CandidateURI. Use it</em><a name="53" href="#53">53</a> <em> * to add custom data or state needed later doing custom processing.</em><a name="54" href="#54">54</a> <em> * See accessors/setters {@link #putString(String, String)},</em><a name="55" href="#55">55</a> <em> * {@link #getString(String)}, etc. </em><a name="56" href="#56">56</a> <em> *</em><a name="57" href="#57">57</a> <em> * @author Gordon Mohr</em><a name="58" href="#58">58</a> <em> */</em><a name="59" href="#59">59</a> <strong>public</strong> <strong>class</strong> <a href="../../../../org/archive/crawler/datamodel/CandidateURI.html">CandidateURI</a><a name="60" href="#60">60</a> implements Serializable, Reporter, <a href="../../../../org/archive/crawler/datamodel/CoreAttributeConstants.html">CoreAttributeConstants</a> {<a name="61" href="#61">61</a> <strong>private</strong> <strong>static</strong> <strong>final</strong> <strong>long</strong> serialVersionUID = -7152937921526560388L;<a name="62" href="#62">62</a> <a name="63" href="#63">63</a> <em>/**<em>* Highest scheduling priority.</em></em><a name="64" href="#64">64</a> <em> * Before any others of its class.</em><a name="65" href="#65">65</a> <em> */</em><a name="66" href="#66">66</a> <strong>public</strong> <strong>static</strong> <strong>final</strong> <strong>int</strong> HIGHEST = 0;<a name="67" href="#67">67</a> <a name="68" href="#68">68</a> <em>/**<em>* High scheduling priority.</em></em><a name="69" href="#69">69</a> <em> * After any {@link #HIGHEST}.</em><a name="70" href="#70">70</a> <em> */</em><a name="71" href="#71">71</a> <strong>public</strong> <strong>static</strong> <strong>final</strong> <strong>int</strong> HIGH = 1;<a name="72" href="#72">72</a> <a name="73" href="#73">73</a> <em>/**<em>* Medium priority.</em></em><a name="74" href="#74">74</a> <em> * After any {@link #HIGH}.</em><a name="75" href="#75">75</a> <em> */</em><a name="76" href="#76">76</a> <strong>public</strong> <strong>static</strong> <strong>final</strong> <strong>int</strong> MEDIUM = 2;<a name="77" href="#77">77</a> <a name="78" href="#78">78</a> <em>/**<em>* Normal/low priority.</em></em><a name="79" href="#79">79</a> <em> * Whenever/end of queue.</em><a name="80" href="#80">80</a> <em> */</em><a name="81" href="#81">81</a> <strong>public</strong> <strong>static</strong> <strong>final</strong> <strong>int</strong> NORMAL = 3;<a name="82" href="#82">82</a> <a name="83" href="#83">83</a> <strong>private</strong> <strong>int</strong> schedulingDirective = NORMAL;<a name="84" href="#84">84</a> <a name="85" href="#85">85</a> <em>/**<em>* </em></em><a name="86" href="#86">86</a> <em> * Usuable URI under consideration. Transient to allow</em><a name="87" href="#87">87</a> <em> * more efficient custom serialization </em><a name="88" href="#88">88</a> <em> */</em><a name="89" href="#89">89</a> <strong>private</strong> <strong>transient</strong> <a href="../../../../org/archive/net/UURI.html">UURI</a> uuri;<a name="90" href="#90">90</a> <a name="91" href="#91">91</a> <em>/**<em>* Seed status */</em></em><a name="92" href="#92">92</a> <strong>private</strong> <strong>boolean</strong> isSeed = false;<a name="93" href="#93">93</a> <a name="94" href="#94">94</a> <strong>private</strong> <strong>boolean</strong> forceRevisit = false; <em class="comment">// even if already visited</em><a name="95" href="#95">95</a> <a name="96" href="#96">96</a> <em>/**<em>* String of letters indicating how this URI was reached from a seed.</em></em><a name="97" href="#97">97</a> <em> * <pre></em><a name="98" href="#98">98</a> <em> * P precondition</em><a name="99" href="#99">99</a> <em> * R redirection</em><a name="100" href="#100">100</a> <em> * E embedded (as frame, src, link, codebase, etc.)</em><a name="101" href="#101">101</a> <em> * X speculative embed (as from javascript, some alternate-format extractors</em><a name="102" href="#102">102</a> <em> * L link</pre></em><a name="103" href="#103">103</a> <em> * For example LLLE (an embedded image on a page 3 links from seed).</em><a name="104" href="#104">104</a> <em> */</em><a name="105" href="#105">105</a> <strong>private</strong> String pathFromSeed;<a name="106" href="#106">106</a> <a name="107" href="#107">107</a> <em>/**<em>*</em></em><a name="108" href="#108">108</a> <em> * Where this URI was (presently) discovered. . Transient to allow</em><a name="109" href="#109">109</a> <em> * more efficient custom serialization</em><a name="110" href="#110">110</a> <em> */</em><a name="111" href="#111">111</a> <strong>private</strong> <strong>transient</strong> <a href="../../../../org/archive/net/UURI.html">UURI</a> via;<a name="112" href="#112">112</a> <a name="113" href="#113">113</a> <em>/**<em>*</em></em><a name="114" href="#114">114</a> <em> * Context of URI's discovery, as per the 'context' in Link</em><a name="115" href="#115">115</a> <em> */</em><a name="116" href="#116">116</a> <strong>private</strong> CharSequence viaContext;<a name="117" href="#117">117</a> <a name="118" href="#118">118</a> <em>/**<em>*</em></em><a name="119" href="#119">119</a> <em> * Flexible dynamic attributes list.</em><a name="120" href="#120">120</a> <em> * <p></em><a name="121" href="#121">121</a> <em> * The attribute list is a flexible map of key/value pairs for storing</em><a name="122" href="#122">122</a> <em> * status of this URI for use by other processors. By convention the</em><a name="123" href="#123">123</a> <em> * attribute list is keyed by constants found in the</em><a name="124" href="#124">124</a> <em> * {@link CoreAttributeConstants} interface. Use this list to carry</em><a name="125" href="#125">125</a> <em> * data or state produced by custom processors rather change the</em><a name="126" href="#126">126</a> <em> * classes {@link CrawlURI} or this class, CandidateURI.</em><a name="127" href="#127">127</a> <em> *</em><a name="128" href="#128">128</a> <em> * Transient to allow more efficient custom serialization.</em><a name="129" href="#129">129</a> <em> */</em><a name="130" href="#130">130</a> <strong>private</strong> <strong>transient</strong> <a href="../../../../st/ata/util/AList.html">AList</a> alist;<a name="131" href="#131">131</a> <a name="132" href="#132">132</a> <em>/**<em>*</em></em><a name="133" href="#133">133</a> <em> * Cache of this candidate uuri as a string.</em><a name="134" href="#134">134</a> <em> *</em><a name="135" href="#135">135</a> <em> * Profiling shows us spending about 1-2% of total elapsed time in</em><a name="136" href="#136">136</a> <em> * toString.</em><a name="137" href="#137">137</a> <em> */</em><a name="138" href="#138">138</a> <strong>private</strong> String cachedCandidateURIString = <strong>null</strong>;<a name="139" href="#139">139</a> <a name="140" href="#140">140</a> <a name="141" href="#141">141</a> <em>/**<em>*</em></em><a name="142" href="#142">142</a> <em> * Frontier/Scheduler lifecycle info.</em><a name="143" href="#143">143</a> <em> * This is an identifier set by the Frontier for its</em><a name="144" href="#144">144</a> <em> * purposes. Usually its the name of the Frontier queue</em><a name="145" href="#145">145</a> <em> * this URI gets queued to. Values can be host + port</em><a name="146" href="#146">146</a> <em> * or IP, etc.</em><a name="147" href="#147">147</a> <em> */</em><a name="148" href="#148">148</a> <strong>private</strong> String classKey;<a name="149" href="#149">149</a> <a name="150" href="#150">150</a> <em>/**<em>*</em></em><a name="151" href="#151">151</a> <em> * Constructor.</em><a name="152" href="#152">152</a> <em> * Protected access to block access to default constructor.</em><a name="153" href="#153">153</a> <em> */</em><a name="154" href="#154">154</a> <strong>protected</strong> <a href="../../../../org/archive/crawler/datamodel/CandidateURI.html">CandidateURI</a> () {<a name="155" href="#155">155</a> <strong>super</strong>();<a name="156" href="#156">156</a> }<a name="157" href="#157">157</a> <a name="158" href="#158">158</a> <em>/**<em>*</em></em><a name="159" href="#159">159</a> <em> * @param u uuri instance this CandidateURI wraps.</em><a name="160" href="#160">160</a> <em> */</em><a name="161" href="#161">161</a> <strong>public</strong> <a href="../../../../org/archive/crawler/datamodel/CandidateURI.html">CandidateURI</a>(<a href="../../../../org/archive/net/UURI.html">UURI</a> u) {<a name="162" href="#162">162</a> <strong>this</strong>.uuri = u;<a name="163" href="#163">163</a> }<a name="164" href="#164">164</a> <a name="165" href="#165">165</a> <em>/**<em>*</em></em><a name="166" href="#166">166</a> <em> * @param u uuri instance this CandidateURI wraps.</em><a name="167" href="#167">167</a> <em> * @param pathFromSeed</em><a name="168" href="#168">168</a> <em> * @param via</em><a name="169" href="#169">169</a> <em> * @param viaContext</em><a name="170" href="#170">170</a> <em> */</em><a name="171" href="#171">171</a> <strong>public</strong> <a href="../../../../org/archive/crawler/datamodel/CandidateURI.html">CandidateURI</a>(<a href="../../../../org/archive/net/UURI.html">UURI</a> u, String pathFromSeed, <a href="../../../../org/archive/net/UURI.html">UURI</a> via,<a name="172" href="#172">172</a> CharSequence viaContext) {?? 快捷鍵說明
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