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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>NotExceedsDocumentLengthTresholdDecideRule xref</title><link type="text/css" rel="stylesheet" href="../../../../stylesheet.css" /></head><body><div id="overview"><a href="../../../../../apidocs/org/archive/crawler/deciderules/NotExceedsDocumentLengthTresholdDecideRule.html">View Javadoc</a></div><pre><a name="1" href="#1">1</a> <em class="comment">/*<em class="comment"> $Id: NotExceedsDocumentLengthTresholdDecideRule.java 4649 2006-09-25 17:16:55Z paul_jack $</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 28.8.2006</em><a name="4" href="#4">4</a> <em class="comment"> *</em><a name="5" href="#5">5</a> <em class="comment"> * Copyright (C) 2006 Olaf Freyer</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/deciderules/package-summary.html">org.archive.crawler.deciderules</a>;<a name="24" href="#24">24</a> <a name="25" href="#25">25</a> <strong>import</strong> java.util.logging.Level;<a name="26" href="#26">26</a> <strong>import</strong> java.util.logging.Logger;<a name="27" href="#27">27</a> <a name="28" href="#28">28</a> <strong>import</strong> org.apache.commons.httpclient.HttpMethod;<a name="29" href="#29">29</a> <strong>import</strong> org.archive.crawler.datamodel.CoreAttributeConstants;<a name="30" href="#30">30</a> <strong>import</strong> org.archive.crawler.datamodel.CrawlURI;<a name="31" href="#31">31</a> <strong>import</strong> org.archive.crawler.settings.SimpleType;<a name="32" href="#32">32</a> <a name="33" href="#33">33</a> <strong>public</strong> <strong>class</strong> <a href="../../../../org/archive/crawler/deciderules/NotExceedsDocumentLengthTresholdDecideRule.html">NotExceedsDocumentLengthTresholdDecideRule</a><a name="34" href="#34">34</a> <strong>extends</strong> <a href="../../../../org/archive/crawler/deciderules/PredicatedDecideRule.html">PredicatedDecideRule</a> implements <a href="../../../../org/archive/crawler/datamodel/CoreAttributeConstants.html">CoreAttributeConstants</a> {<a name="35" href="#35">35</a> <a name="36" href="#36">36</a> <a name="37" href="#37">37</a> <strong>private</strong> <strong>static</strong> <strong>final</strong> <strong>long</strong> serialVersionUID = -8774160016195991876L;<a name="38" href="#38">38</a> <a name="39" href="#39">39</a> <strong>private</strong> <strong>static</strong> <strong>final</strong> Logger logger = Logger.<a name="40" href="#40">40</a> getLogger(NotExceedsDocumentLengthTresholdDecideRule.<strong>class</strong>.getName());<a name="41" href="#41">41</a> <strong>public</strong> <strong>static</strong> <strong>final</strong> String ATTR_CONTENT_LENGTH_TRESHOLD =<a name="42" href="#42">42</a> <span class="string">"content-length-treshold"</span>;<a name="43" href="#43">43</a> <strong>static</strong> <strong>final</strong> Integer DEFAULT_CONTENT_LENGTH_TRESHOLD = -1;<a name="44" href="#44">44</a> <strong>public</strong> <strong>static</strong> <strong>final</strong> String ATTR_USE_AS_MIDFETCH = <span class="string">"use-as-midfetch-filter"</span>;<a name="45" href="#45">45</a> <strong>static</strong> <strong>final</strong> Boolean DEFAULT_USE_AS_MIDFETCH = <strong>new</strong> Boolean(<strong>true</strong>);<a name="46" href="#46">46</a> <a name="47" href="#47">47</a> <a name="48" href="#48">48</a> <em class="comment">// Header predictor state constants</em><a name="49" href="#49">49</a> <strong>public</strong> <strong>static</strong> <strong>final</strong> <strong>int</strong> HEADER_PREDICTS_MISSING = -1;<a name="50" href="#50">50</a> <a name="51" href="#51">51</a> <strong>public</strong> <a href="../../../../org/archive/crawler/deciderules/NotExceedsDocumentLengthTresholdDecideRule.html">NotExceedsDocumentLengthTresholdDecideRule</a>(String name){<a name="52" href="#52">52</a> <strong>super</strong>(name);<a name="53" href="#53">53</a> setDescription(<span class="string">"NotExceedsDocumentLengthTresholdDecideRule. "</span> +<a name="54" href="#54">54</a> <span class="string">"REJECTs URIs "</span>+<a name="55" href="#55">55</a> <span class="string">"with content length exceeding a given treshold. "</span>+<a name="56" href="#56">56</a> <span class="string">"Either examines HTTP header content length or "</span> +<a name="57" href="#57">57</a> <span class="string">"actual downloaded content length and returns false "</span> +<a name="58" href="#58">58</a> <span class="string">"for documents exceeding a given length treshold."</span>);<a name="59" href="#59">59</a> <a name="60" href="#60">60</a> addElementToDefinition(<strong>new</strong> <a href="../../../../org/archive/crawler/settings/SimpleType.html">SimpleType</a>(ATTR_USE_AS_MIDFETCH,<a name="61" href="#61">61</a> <span class="string">"Shall this rule be used as a midfetch rule? If true, "</span> +<a name="62" href="#62">62</a> <span class="string">"this rule will determine content length based on HTTP "</span> +<a name="63" href="#63">63</a> <span class="string">"header information, otherwise the size of the already "</span> +<a name="64" href="#64">64</a> <span class="string">"downloaded content will be used."</span>,<a name="65" href="#65">65</a> DEFAULT_USE_AS_MIDFETCH));<a name="66" href="#66">66</a> <a name="67" href="#67">67</a> addElementToDefinition(<strong>new</strong> <a href="../../../../org/archive/crawler/settings/SimpleType.html">SimpleType</a>(ATTR_CONTENT_LENGTH_TRESHOLD,<a name="68" href="#68">68</a> <span class="string">"Max "</span> +<a name="69" href="#69">69</a> <span class="string">"content-length this filter will allow to pass through. If -1, "</span> +<a name="70" href="#70">70</a> <span class="string">"then no limit."</span>,<a name="71" href="#71">71</a> DEFAULT_CONTENT_LENGTH_TRESHOLD));<a name="72" href="#72">72</a> }<a name="73" href="#73">73</a> <a name="74" href="#74">74</a> <strong>protected</strong> <strong>boolean</strong> evaluate(Object object) {<a name="75" href="#75">75</a> <strong>try</strong> {<a name="76" href="#76">76</a> <a href="../../../../org/archive/crawler/datamodel/CrawlURI.html">CrawlURI</a> curi = (CrawlURI)object;<a name="77" href="#77">77</a> <a name="78" href="#78">78</a> <strong>int</strong> contentlength = HEADER_PREDICTS_MISSING;<a name="79" href="#79">79</a> <a name="80" href="#80">80</a> <em class="comment">//filter used as midfetch filter</em><a name="81" href="#81">81</a> <strong>if</strong> (getIsMidfetchRule(object)){<a name="82" href="#82">82</a> <a name="83" href="#83">83</a> <strong>if</strong>(curi.containsKey(A_HTTP_TRANSACTION) == false){<a name="84" href="#84">84</a> <em class="comment">// Missing header info, let pass</em><a name="85" href="#85">85</a> <strong>if</strong> (logger.isLoggable(Level.INFO)) {<a name="86" href="#86">86</a> logger.info(<span class="string">"Error: Missing HttpMethod object in "</span> +<a name="87" href="#87">87</a> <span class="string">"CrawlURI. "</span> + curi.toString());<a name="88" href="#88">88</a> }<a name="89" href="#89">89</a> <strong>return</strong> false;<a name="90" href="#90">90</a> }<a name="91" href="#91">91</a> <a name="92" href="#92">92</a> <em class="comment">// Initially assume header info is missing</em><a name="93" href="#93">93</a> HttpMethod method =<a name="94" href="#94">94</a> (HttpMethod)curi.getObject(A_HTTP_TRANSACTION);<a name="95" href="#95">95</a> <a name="96" href="#96">96</a> <em class="comment">// get content-length </em><a name="97" href="#97">97</a> String newContentlength = <strong>null</strong>;<a name="98" href="#98">98</a> <strong>if</strong> (method.getResponseHeader(<span class="string">"content-length"</span>) != <strong>null</strong>) {<a name="99" href="#99">99</a> newContentlength = method.<a name="100" href="#100">100</a> getResponseHeader(<span class="string">"content-length"</span>).getValue();<a name="101" href="#101">101</a> }<a name="102" href="#102">102</a> <a name="103" href="#103">103</a> <strong>if</strong> (newContentlength != <strong>null</strong> &&<a name="104" href="#104">104</a> newContentlength.length() > 0) {<a name="105" href="#105">105</a> <strong>try</strong> {<a name="106" href="#106">106</a> contentlength = Integer.parseInt(newContentlength);<a name="107" href="#107">107</a> } <strong>catch</strong> (NumberFormatException nfe) {<a name="108" href="#108">108</a> <em class="comment">// Ignore.</em><a name="109" href="#109">109</a> }<a name="110" href="#110">110</a> }<a name="111" href="#111">111</a> <a name="112" href="#112">112</a> <em class="comment">// If no document length was reported or format was wrong, </em><a name="113" href="#113">113</a> <em class="comment">// let pass</em><a name="114" href="#114">114</a> <strong>if</strong> (contentlength == HEADER_PREDICTS_MISSING) {<a name="115" href="#115">115</a> <strong>return</strong> false;<a name="116" href="#116">116</a> }<a name="117" href="#117">117</a> } <strong>else</strong> {<a name="118" href="#118">118</a> contentlength = (<strong>int</strong>)curi.getContentSize();<a name="119" href="#119">119</a> }<a name="120" href="#120">120</a> <a name="121" href="#121">121</a> <strong>return</strong> makeDecision(contentlength, object);<a name="122" href="#122">122</a> <a name="123" href="#123">123</a> } <strong>catch</strong> (ClassCastException e) {<a name="124" href="#124">124</a> <em class="comment">// if not CrawlURI, always disregard</em><a name="125" href="#125">125</a> <strong>return</strong> false; <a name="126" href="#126">126</a> }<a name="127" href="#127">127</a> }<a name="128" href="#128">128</a> <a name="129" href="#129">129</a> <em>/**<em>*</em></em><a name="130" href="#130">130</a> <em> * @param contentLength content length to check against treshold</em><a name="131" href="#131">131</a> <em> * @param obj Context object.</em><a name="132" href="#132">132</a> <em> * @return contentLength not exceeding treshold?</em><a name="133" href="#133">133</a> <em> */</em><a name="134" href="#134">134</a> <strong>protected</strong> Boolean makeDecision(<strong>int</strong> contentLength, Object obj) {<a name="135" href="#135">135</a> <strong>return</strong> contentLength < getContentLengthTreshold(obj);<a name="136" href="#136">136</a> }<a name="137" href="#137">137</a> <a name="138" href="#138">138</a> <em>/**<em>*</em></em><a name="139" href="#139">139</a> <em> * @param obj Context object.</em><a name="140" href="#140">140</a> <em> * @return content length threshold</em><a name="141" href="#141">141</a> <em> */</em><a name="142" href="#142">142</a> <strong>protected</strong> <strong>int</strong> getContentLengthTreshold(Object obj) {<a name="143" href="#143">143</a> <strong>int</strong> len = ((Integer)getUncheckedAttribute(obj,<a name="144" href="#144">144</a> ATTR_CONTENT_LENGTH_TRESHOLD)).intValue();<a name="145" href="#145">145</a> <strong>return</strong> len == -1? Integer.MAX_VALUE: len;<a name="146" href="#146">146</a> }<a name="147" href="#147">147</a> <a name="148" href="#148">148</a> <em>/**<em>*</em></em><a name="149" href="#149">149</a> <em> * @param obj Context object.</em><a name="150" href="#150">150</a> <em> * @return to be used as midfetch rule?</em><a name="151" href="#151">151</a> <em> */</em><a name="152" href="#152">152</a> <strong>private</strong> Boolean getIsMidfetchRule(Object obj) {<a name="153" href="#153">153</a> <strong>return</strong> ((Boolean)getUncheckedAttribute(obj,ATTR_USE_AS_MIDFETCH)).<a name="154" href="#154">154</a> booleanValue();<a name="155" href="#155">155</a> }<a name="156" href="#156">156</a> }</pre><hr/><div id="footer">This page was automatically generated by <a href="http://maven.apache.org/">Maven</a></div></body></html>?? 快捷鍵說明
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