📄 experimentalwarcwriter.html
字号:
<!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=ISO-8859-1" /><title>ExperimentalWARCWriter xref</title><link type="text/css" rel="stylesheet" href="../../../../stylesheet.css" /></head><body><pre><a name="1" href="#1">1</a> <em class="comment">/*<em class="comment"> $Id: ExperimentalWARCWriter.java,v 1.21 2006/09/06 05:38:18 stack-sf Exp $</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 July 27th, 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 Internet Archive.</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/io/warc/package-summary.html">org.archive.io.warc</a>;<a name="24" href="#24">24</a> <a name="25" href="#25">25</a> <strong>import</strong> java.io.ByteArrayInputStream;<a name="26" href="#26">26</a> <strong>import</strong> java.io.ByteArrayOutputStream;<a name="27" href="#27">27</a> <strong>import</strong> java.io.File;<a name="28" href="#28">28</a> <strong>import</strong> java.io.IOException;<a name="29" href="#29">29</a> <strong>import</strong> java.io.InputStream;<a name="30" href="#30">30</a> <strong>import</strong> java.io.OutputStream;<a name="31" href="#31">31</a> <strong>import</strong> java.net.URI;<a name="32" href="#32">32</a> <strong>import</strong> java.net.URISyntaxException;<a name="33" href="#33">33</a> <strong>import</strong> java.text.DecimalFormat;<a name="34" href="#34">34</a> <strong>import</strong> java.text.NumberFormat;<a name="35" href="#35">35</a> <strong>import</strong> java.util.Iterator;<a name="36" href="#36">36</a> <strong>import</strong> java.util.List;<a name="37" href="#37">37</a> <strong>import</strong> java.util.Map;<a name="38" href="#38">38</a> <strong>import</strong> java.util.concurrent.atomic.AtomicInteger;<a name="39" href="#39">39</a> <a name="40" href="#40">40</a> <strong>import</strong> org.archive.io.UTF8Bytes;<a name="41" href="#41">41</a> <strong>import</strong> org.archive.io.WriterPoolMember;<a name="42" href="#42">42</a> <strong>import</strong> org.archive.uid.GeneratorFactory;<a name="43" href="#43">43</a> <strong>import</strong> org.archive.util.ArchiveUtils;<a name="44" href="#44">44</a> <strong>import</strong> org.archive.util.anvl.ANVLRecord;<a name="45" href="#45">45</a> <a name="46" href="#46">46</a> <a name="47" href="#47">47</a> <em>/**<em>*</em></em><a name="48" href="#48">48</a> <em> * <b>Experimental</b> WARC implementation.</em><a name="49" href="#49">49</a> <em> * </em><a name="50" href="#50">50</a> <em> * Based on unreleased version 0.9 of <a </em><a name="51" href="#51">51</a> <em> * href="<a href="http://archive-access.sourceforge.net//warc/warc_file_format.html" target="alexandria_uri">http://archive-access.sourceforge.net//warc/warc_file_format.html</a>">WARC</em><a name="52" href="#52">52</a> <em> * File Format</a> document. Specification and implementation subject to</em><a name="53" href="#53">53</a> <em> * change.</em><a name="54" href="#54">54</a> <em> *</em><a name="55" href="#55">55</a> <em> * <p>Assumption is that the caller is managing access to this</em><a name="56" href="#56">56</a> <em> * ExperimentalWARCWriter ensuring only one thread accessing this WARC instance</em><a name="57" href="#57">57</a> <em> * at any one time.</em><a name="58" href="#58">58</a> <em> * </em><a name="59" href="#59">59</a> <em> * <p>While being written, WARCs have a '.open' suffix appended.</em><a name="60" href="#60">60</a> <em> *</em><a name="61" href="#61">61</a> <em> * @author stack</em><a name="62" href="#62">62</a> <em> * @version $Revision: 1.21 $ $Date: 2006/09/06 05:38:18 $</em><a name="63" href="#63">63</a> <em> */</em><a name="64" href="#64">64</a> <strong>public</strong> <strong>class</strong> <a href="../../../../org/archive/io/warc/ExperimentalWARCWriter.html">ExperimentalWARCWriter</a> <strong>extends</strong> <a href="../../../../org/archive/io/WriterPoolMember.html">WriterPoolMember</a><a name="65" href="#65">65</a> implements <a href="../../../../org/archive/io/warc/WARCConstants.html">WARCConstants</a> {<a name="66" href="#66">66</a> <em>/**<em>*</em></em><a name="67" href="#67">67</a> <em> * Buffer to reuse writing streams.</em><a name="68" href="#68">68</a> <em> */</em><a name="69" href="#69">69</a> <strong>private</strong> <strong>final</strong> byte [] readbuffer = <strong>new</strong> byte[16 * 1024];<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> * NEWLINE as bytes.</em><a name="73" href="#73">73</a> <em> */</em><a name="74" href="#74">74</a> <strong>public</strong> <strong>static</strong> byte [] CRLF_BYTES;<a name="75" href="#75">75</a> <strong>static</strong> {<a name="76" href="#76">76</a> <strong>try</strong> {<a name="77" href="#77">77</a> CRLF_BYTES = CRLF.getBytes(DEFAULT_ENCODING);<a name="78" href="#78">78</a> } <strong>catch</strong>(Exception e) {<a name="79" href="#79">79</a> e.printStackTrace();<a name="80" href="#80">80</a> }<a name="81" href="#81">81</a> };<a name="82" href="#82">82</a> <a name="83" href="#83">83</a> <em>/**<em>*</em></em><a name="84" href="#84">84</a> <em> * Formatter for the length.</em><a name="85" href="#85">85</a> <em> */</em><a name="86" href="#86">86</a> <strong>private</strong> <strong>static</strong> NumberFormat RECORD_LENGTH_FORMATTER =<a name="87" href="#87">87</a> <strong>new</strong> DecimalFormat(PLACEHOLDER_RECORD_LENGTH_STRING);<a name="88" href="#88">88</a> <a name="89" href="#89">89</a> <em>/**<em>*</em></em><a name="90" href="#90">90</a> <em> * Metadata.</em><a name="91" href="#91">91</a> <em> * TODO: Exploit writing warcinfo record. Currently unused.</em><a name="92" href="#92">92</a> <em> */</em><a name="93" href="#93">93</a> <strong>private</strong> <strong>final</strong> List fileMetadata;<a name="94" href="#94">94</a> <a name="95" href="#95">95</a> <a name="96" href="#96">96</a> <em>/**<em>*</em></em><a name="97" href="#97">97</a> <em> * Shutdown Constructor</em><a name="98" href="#98">98</a> <em> * Has default access so can make instance to test utility methods.</em><a name="99" href="#99">99</a> <em> */</em><a name="100" href="#100">100</a> <a href="../../../../org/archive/io/warc/ExperimentalWARCWriter.html">ExperimentalWARCWriter</a>() {<a name="101" href="#101">101</a> <strong>this</strong>(<strong>null</strong>, <strong>null</strong>, <span class="string">""</span>, <span class="string">""</span>, <strong>true</strong>, -1, <strong>null</strong>);<a name="102" href="#102">102</a> }<a name="103" href="#103">103</a> <a name="104" href="#104">104</a> <em>/**<em>*</em></em><a name="105" href="#105">105</a> <em> * Constructor.</em><a name="106" href="#106">106</a> <em> * Takes a stream. Use with caution. There is no upperbound check on size.</em><a name="107" href="#107">107</a> <em> * Will just keep writing. Only pass Streams that are bounded. </em><a name="108" href="#108">108</a> <em> * @param serialNo used to generate unique file name sequences</em><a name="109" href="#109">109</a> <em> * @param out Where to write.</em><a name="110" href="#110">110</a> <em> * @param f File the <code>out</code> is connected to.</em><a name="111" href="#111">111</a> <em> * @param cmprs Compress the content written.</em><a name="112" href="#112">112</a> <em> * @param a14DigitDate If null, we'll write current time.</em><a name="113" href="#113">113</a> <em> * @throws IOException</em><a name="114" href="#114">114</a> <em> */</em><a name="115" href="#115">115</a> <strong>public</strong> <a href="../../../../org/archive/io/warc/ExperimentalWARCWriter.html">ExperimentalWARCWriter</a>(<strong>final</strong> AtomicInteger serialNo,<a name="116" href="#116">116</a> <strong>final</strong> OutputStream out, <strong>final</strong> File f,<a name="117" href="#117">117</a> <strong>final</strong> <strong>boolean</strong> cmprs, <strong>final</strong> String a14DigitDate,<a name="118" href="#118">118</a> <strong>final</strong> List warcinfoData)<a name="119" href="#119">119</a> throws IOException {<a name="120" href="#120">120</a> <strong>super</strong>(serialNo, out, f, cmprs, a14DigitDate);<a name="121" href="#121">121</a> <em class="comment">// TODO: Currently unused.</em><a name="122" href="#122">122</a> <strong>this</strong>.fileMetadata = warcinfoData;<a name="123" href="#123">123</a> }<a name="124" href="#124">124</a> <a name="125" href="#125">125</a> <em>/**<em>*</em></em><a name="126" href="#126">126</a> <em> * Constructor.</em><a name="127" href="#127">127</a> <em> *</em><a name="128" href="#128">128</a> <em> * @param dirs Where to drop files.</em><a name="129" href="#129">129</a> <em> * @param prefix File prefix to use.</em><a name="130" href="#130">130</a> <em> * @param cmprs Compress the records written. </em><a name="131" href="#131">131</a> <em> * @param maxSize Maximum size for ARC files written.</em><a name="132" href="#132">132</a> <em> * @param suffix File tail to use. If null, unused.</em><a name="133" href="#133">133</a> <em> * @param warcinfoData File metadata for warcinfo record.</em><a name="134" href="#134">134</a> <em> */</em><a name="135" href="#135">135</a> <strong>public</strong> <a href="../../../../org/archive/io/warc/ExperimentalWARCWriter.html">ExperimentalWARCWriter</a>(<strong>final</strong> AtomicInteger serialNo,<a name="136" href="#136">136</a> <strong>final</strong> List<File> dirs, <strong>final</strong> String prefix, <a name="137" href="#137">137</a> <strong>final</strong> String suffix, <strong>final</strong> <strong>boolean</strong> cmprs,<a name="138" href="#138">138</a> <strong>final</strong> <strong>int</strong> maxSize, <strong>final</strong> List warcinfoData) {<a name="139" href="#139">139</a> <strong>super</strong>(serialNo, dirs, prefix, suffix, cmprs, maxSize,<a name="140" href="#140">140</a> WARC_FILE_EXTENSION);<a name="141" href="#141">141</a> <em class="comment">// TODO: Currently unused.</em><a name="142" href="#142">142</a> <strong>this</strong>.fileMetadata = warcinfoData;<a name="143" href="#143">143</a> }<a name="144" href="#144">144</a> <a name="145" href="#145">145</a> @Override<a name="146" href="#146">146</a> <strong>protected</strong> String createFile(File file) throws IOException {<a name="147" href="#147">147</a> String filename = <strong>super</strong>.createFile(file);⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -