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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>WARCConstants xref</title><link type="text/css" rel="stylesheet" href="../../../../stylesheet.css" /></head><body><div id="overview"><a href="../../../../../apidocs/org/archive/io/warc/WARCConstants.html">View Javadoc</a></div><pre><a name="1" href="#1">1</a> <em class="comment">/*</em><a name="2" href="#2">2</a> <em class="comment"> * WARCConstants</em><a name="3" href="#3">3</a> <em class="comment"> *</em><a name="4" href="#4">4</a> <em class="comment"> * $Id: WARCConstants.java 4976 2007-03-09 13:59:07Z gojomo $</em><a name="5" href="#5">5</a> <em class="comment"> *</em><a name="6" href="#6">6</a> <em class="comment"> * Created on July 27th, 2006</em><a name="7" href="#7">7</a> <em class="comment"> *</em><a name="8" href="#8">8</a> <em class="comment"> * Copyright (C) 2006 Internet Archive.</em><a name="9" href="#9">9</a> <em class="comment"> *</em><a name="10" href="#10">10</a> <em class="comment"> * This file is part of the Heritrix web crawler (crawler.archive.org).</em><a name="11" href="#11">11</a> <em class="comment"> *</em><a name="12" href="#12">12</a> <em class="comment"> * Heritrix is free software; you can redistribute it and/or modify</em><a name="13" href="#13">13</a> <em class="comment"> * it under the terms of the GNU Lesser Public License as published by</em><a name="14" href="#14">14</a> <em class="comment"> * the Free Software Foundation; either version 2.1 of the License, or</em><a name="15" href="#15">15</a> <em class="comment"> * any later version.</em><a name="16" href="#16">16</a> <em class="comment"> *</em><a name="17" href="#17">17</a> <em class="comment"> * Heritrix is distributed in the hope that it will be useful,</em><a name="18" href="#18">18</a> <em class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</em><a name="19" href="#19">19</a> <em class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</em><a name="20" href="#20">20</a> <em class="comment"> * GNU Lesser Public License for more details.</em><a name="21" href="#21">21</a> <em class="comment"> *</em><a name="22" href="#22">22</a> <em class="comment"> * You should have received a copy of the GNU Lesser Public License</em><a name="23" href="#23">23</a> <em class="comment"> * along with Heritrix; if not, write to the Free Software</em><a name="24" href="#24">24</a> <em class="comment"> * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA</em><a name="25" href="#25">25</a> <em class="comment"> */</em><a name="26" href="#26">26</a> <strong>package</strong> <a href="../../../../org/archive/io/warc/package-summary.html">org.archive.io.warc</a>;<a name="27" href="#27">27</a> <a name="28" href="#28">28</a> <strong>import</strong> java.util.Arrays;<a name="29" href="#29">29</a> <strong>import</strong> java.util.List;<a name="30" href="#30">30</a> <a name="31" href="#31">31</a> <strong>import</strong> org.archive.io.ArchiveFileConstants;<a name="32" href="#32">32</a> <a name="33" href="#33">33</a> <em>/**<em>*</em></em><a name="34" href="#34">34</a> <em> * WARC Constants used by WARC readers and writers.</em><a name="35" href="#35">35</a> <em> * Below constants are used by version 0.10 and 0.12 of WARC Reader/Writer.</em><a name="36" href="#36">36</a> <em> * @author stack</em><a name="37" href="#37">37</a> <em> * @version $Revision: 4976 $ $Date: 2007-03-09 13:59:07 +0000 (Fri, 09 Mar 2007) $</em><a name="38" href="#38">38</a> <em> */</em><a name="39" href="#39">39</a> <strong>public</strong> <strong>interface</strong> <a href="../../../../org/archive/io/warc/WARCConstants.html">WARCConstants</a> <strong>extends</strong> <a href="../../../../org/archive/io/ArchiveFileConstants.html">ArchiveFileConstants</a> {<a name="40" href="#40">40</a> <em>/**<em>*</em></em><a name="41" href="#41">41</a> <em> * Default maximum WARC file size.</em><a name="42" href="#42">42</a> <em> * 1Gig.</em><a name="43" href="#43">43</a> <em> */</em><a name="44" href="#44">44</a> <strong>public</strong> <strong>static</strong> <strong>final</strong> <strong>int</strong> DEFAULT_MAX_WARC_FILE_SIZE = 1024 * 1024 * 1024;<a name="45" href="#45">45</a> <a name="46" href="#46">46</a> <em>/**<em>*</em></em><a name="47" href="#47">47</a> <em> * WARC MAGIC</em><a name="48" href="#48">48</a> <em> * WARC files and records begin with this sequence.</em><a name="49" href="#49">49</a> <em> */</em><a name="50" href="#50">50</a> <strong>public</strong> <strong>static</strong> <strong>final</strong> String WARC_MAGIC = <span class="string">"WARC/"</span>;<a name="51" href="#51">51</a> <strong>public</strong> <strong>static</strong> <strong>final</strong> String WARC_010_MAGIC = <span class="string">"WARC/"</span>;<a name="52" href="#52">52</a> <a name="53" href="#53">53</a> <em>/**<em>*</em></em><a name="54" href="#54">54</a> <em> * Hard-coded version for WARC files made with this code.</em><a name="55" href="#55">55</a> <em> * Setting to 0.10 because differs from 0.9 spec. See accompanying</em><a name="56" href="#56">56</a> <em> * package documentation.</em><a name="57" href="#57">57</a> <em> */</em><a name="58" href="#58">58</a> <strong>public</strong> <strong>static</strong> <strong>final</strong> String WARC_VERSION = <span class="string">"0.12"</span>;<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> * Assumed maximum size of a Header Line.</em><a name="62" href="#62">62</a> <em> *</em><a name="63" href="#63">63</a> <em> * This 100k which seems massive but its the same as the LINE_LENGTH from</em><a name="64" href="#64">64</a> <em> * <code>alexa/include/a_arcio.h</code>:</em><a name="65" href="#65">65</a> <em> * <pre></em><a name="66" href="#66">66</a> <em> * #define LINE_LENGTH (100*1024)</em><a name="67" href="#67">67</a> <em> * </pre></em><a name="68" href="#68">68</a> <em> */</em><a name="69" href="#69">69</a> <strong>public</strong> <strong>static</strong> <strong>final</strong> <strong>int</strong> MAX_WARC_HEADER_LINE_LENGTH = 1024 * 100;<a name="70" href="#70">70</a> <strong>public</strong> <strong>static</strong> <strong>final</strong> <strong>int</strong> MAX_LINE_LENGTH = MAX_WARC_HEADER_LINE_LENGTH;<a name="71" href="#71">71</a> <a name="72" href="#72">72</a> <em>/**<em>*</em></em><a name="73" href="#73">73</a> <em> * WARC file extention.</em><a name="74" href="#74">74</a> <em> */</em><a name="75" href="#75">75</a> <strong>public</strong> <strong>static</strong> <strong>final</strong> String WARC_FILE_EXTENSION = <span class="string">"warc"</span>;<a name="76" href="#76">76</a> <a name="77" href="#77">77</a> <em>/**<em>*</em></em><a name="78" href="#78">78</a> <em> * Dot WARC file extension.</em><a name="79" href="#79">79</a> <em> */</em><a name="80" href="#80">80</a> <strong>public</strong> <strong>static</strong> <strong>final</strong> String DOT_WARC_FILE_EXTENSION =<a name="81" href="#81">81</a> <span class="string">"."</span> + WARC_FILE_EXTENSION;<a name="82" href="#82">82</a> <a name="83" href="#83">83</a> <strong>public</strong> <strong>static</strong> <strong>final</strong> String DOT_COMPRESSED_FILE_EXTENSION =<a name="84" href="#84">84</a> ArchiveFileConstants.DOT_COMPRESSED_FILE_EXTENSION;<a name="85" href="#85">85</a> <a name="86" href="#86">86</a> <em>/**<em>*</em></em><a name="87" href="#87">87</a> <em> * Compressed WARC file extension.</em><a name="88" href="#88">88</a> <em> */</em><a name="89" href="#89">89</a> <strong>public</strong> <strong>static</strong> <strong>final</strong> String COMPRESSED_WARC_FILE_EXTENSION =<a name="90" href="#90">90</a> WARC_FILE_EXTENSION + DOT_COMPRESSED_FILE_EXTENSION;<a name="91" href="#91">91</a> <a name="92" href="#92">92</a> <em>/**<em>*</em></em><a name="93" href="#93">93</a> <em> * Compressed dot WARC file extension.</em><a name="94" href="#94">94</a> <em> */</em><a name="95" href="#95">95</a> <strong>public</strong> <strong>static</strong> <strong>final</strong> String DOT_COMPRESSED_WARC_FILE_EXTENSION =<a name="96" href="#96">96</a> DOT_WARC_FILE_EXTENSION + DOT_COMPRESSED_FILE_EXTENSION;<a name="97" href="#97">97</a> <a name="98" href="#98">98</a> <em>/**<em>*</em></em><a name="99" href="#99">99</a> <em> * Encoding to use getting bytes from strings.</em><a name="100" href="#100">100</a> <em> *</em><a name="101" href="#101">101</a> <em> * Specify an encoding rather than leave it to chance: i.e whatever the</em><a name="102" href="#102">102</a> <em> * JVMs encoding. Use an encoding that gets the stream as bytes, not chars.</em><a name="103" href="#103">103</a> <em> * </em><a name="104" href="#104">104</a> <em> * <p>TODO: ARC uses ISO-8859-1. In general, we should use UTF-8 but we</em><a name="105" href="#105">105</a> <em> * probably need a single byte encoding if we're out for preserving the</em><a name="106" href="#106">106</a> <em> * binary data as received over the net (We probably don't want to transform</em><a name="107" href="#107">107</a> <em> * the supra-ASCII characters to UTF-8 before storing in ARC). For now,</em><a name="108" href="#108">108</a> <em> * till we figure it, DEFAULT_ENCODING is single-byte charset -- same as</em><a name="109" href="#109">109</a> <em> * ARCs.</em><a name="110" href="#110">110</a> <em> */</em><a name="111" href="#111">111</a> <strong>public</strong> <strong>static</strong> <strong>final</strong> String DEFAULT_ENCODING = <span class="string">"ISO-8859-1"</span>;<a name="112" href="#112">112</a> <strong>public</strong> <strong>static</strong> <strong>final</strong> String HEADER_LINE_ENCODING = DEFAULT_ENCODING;<a name="113" href="#113">113</a> <a name="114" href="#114">114</a> <em class="comment">// TODO: Revisit. 8859 isn't correct, especially if we settle on RFC822</em><a name="115" href="#115">115</a> <em class="comment">// headers</em><a name="116" href="#116">116</a> <strong>public</strong> <strong>static</strong> <strong>final</strong> String WARC_HEADER_ENCODING = HEADER_LINE_ENCODING;<a name="117" href="#117">117</a> <a name="118" href="#118">118</a> <strong>public</strong> <strong>static</strong> <strong>final</strong> String [] HEADER_FIELD_KEYS = {<a name="119" href="#119">119</a> VERSION_FIELD_KEY,⌨️ 快捷键说明
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