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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>WARCReader xref</title><link type="text/css" rel="stylesheet" href="../../../../stylesheet.css" /></head><body><div id="overview"><a href="../../../../../apidocs/org/archive/io/warc/WARCReader.html">View Javadoc</a></div><pre><a name="1" href="#1">1</a> <em class="comment">/*<em class="comment"> $Id: WARCReader.java,v 1.5 2006/08/28 23:44:17 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 Aug 23, 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.File;<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.InputStream;<a name="28" href="#28">28</a> <strong>import</strong> java.util.Iterator;<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.apache.commons.cli.CommandLine;<a name="32" href="#32">32</a> <strong>import</strong> org.apache.commons.cli.HelpFormatter;<a name="33" href="#33">33</a> <strong>import</strong> org.apache.commons.cli.Option;<a name="34" href="#34">34</a> <strong>import</strong> org.apache.commons.cli.Options;<a name="35" href="#35">35</a> <strong>import</strong> org.apache.commons.cli.ParseException;<a name="36" href="#36">36</a> <strong>import</strong> org.apache.commons.cli.PosixParser;<a name="37" href="#37">37</a> <strong>import</strong> org.archive.io.ArchiveReader;<a name="38" href="#38">38</a> <strong>import</strong> org.archive.io.ArchiveRecord;<a name="39" href="#39">39</a> <a name="40" href="#40">40</a> <em>/**<em>*</em></em><a name="41" href="#41">41</a> <em> * WARCReader.</em><a name="42" href="#42">42</a> <em> * Go via {@link WARCReaderFactory} to get instance.</em><a name="43" href="#43">43</a> <em> * @author stack</em><a name="44" href="#44">44</a> <em> * @version $Date: 2006/08/28 23:44:17 $ $Version$</em><a name="45" href="#45">45</a> <em> */</em><a name="46" href="#46">46</a> <strong>public</strong> <strong>class</strong> <a href="../../../../org/archive/io/warc/WARCReader.html">WARCReader</a> <strong>extends</strong> <a href="../../../../org/archive/io/ArchiveReader.html">ArchiveReader</a> implements <a href="../../../../org/archive/io/warc/WARCConstants.html">WARCConstants</a> {<a name="47" href="#47">47</a> <a href="../../../../org/archive/io/warc/WARCReader.html">WARCReader</a>() {<a name="48" href="#48">48</a> <strong>super</strong>();<a name="49" href="#49">49</a> }<a name="50" href="#50">50</a> <a name="51" href="#51">51</a> @Override<a name="52" href="#52">52</a> <strong>protected</strong> <strong>void</strong> initialize(String i) {<a name="53" href="#53">53</a> <strong>super</strong>.initialize(i);<a name="54" href="#54">54</a> setVersion(WARC_VERSION);<a name="55" href="#55">55</a> }<a name="56" href="#56">56</a> <a name="57" href="#57">57</a> <em>/**<em>*</em></em><a name="58" href="#58">58</a> <em> * Skip over any trailing new lines at end of the record so we're lined up</em><a name="59" href="#59">59</a> <em> * ready to read the next.</em><a name="60" href="#60">60</a> <em> * @param record</em><a name="61" href="#61">61</a> <em> * @throws IOException</em><a name="62" href="#62">62</a> <em> */</em><a name="63" href="#63">63</a> <strong>protected</strong> <strong>void</strong> gotoEOR(<a href="../../../../org/archive/io/ArchiveRecord.html">ArchiveRecord</a> record) throws IOException {<a name="64" href="#64">64</a> <strong>if</strong> (record.available() != 0) {<a name="65" href="#65">65</a> <strong>throw</strong> <strong>new</strong> IOException(<span class="string">"Record should be exhausted before coming "</span> +<a name="66" href="#66">66</a> <span class="string">"in here"</span>);<a name="67" href="#67">67</a> }<a name="68" href="#68">68</a> <a name="69" href="#69">69</a> <em class="comment">// Records end in 2*CRLF. Such it up.</em><a name="70" href="#70">70</a> readExpectedChar(getIn(), CRLF.charAt(0));<a name="71" href="#71">71</a> readExpectedChar(getIn(), CRLF.charAt(1));<a name="72" href="#72">72</a> readExpectedChar(getIn(), CRLF.charAt(0));<a name="73" href="#73">73</a> readExpectedChar(getIn(), CRLF.charAt(1));<a name="74" href="#74">74</a> }<a name="75" href="#75">75</a> <a name="76" href="#76">76</a> <strong>protected</strong> <strong>void</strong> readExpectedChar(<strong>final</strong> InputStream is, <strong>final</strong> <strong>int</strong> expected)<a name="77" href="#77">77</a> throws IOException {<a name="78" href="#78">78</a> <strong>int</strong> c = is.read();<a name="79" href="#79">79</a> <strong>if</strong> (c != expected) {<a name="80" href="#80">80</a> <strong>throw</strong> <strong>new</strong> IOException(<span class="string">"Unexpected character "</span> +<a name="81" href="#81">81</a> Integer.toHexString(c) + <span class="string">"(Expecting "</span> +<a name="82" href="#82">82</a> Integer.toHexString(expected) + <span class="string">")"</span>);<a name="83" href="#83">83</a> }<a name="84" href="#84">84</a> }<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> * Create new WARC record.</em><a name="88" href="#88">88</a> <em> * Encapsulate housekeeping that has to do w/ creating new Record.</em><a name="89" href="#89">89</a> <em> * @param is InputStream to use.</em><a name="90" href="#90">90</a> <em> * @param offset Absolute offset into WARC file.</em><a name="91" href="#91">91</a> <em> * @return A WARCRecord.</em><a name="92" href="#92">92</a> <em> * @throws IOException</em><a name="93" href="#93">93</a> <em> */</em><a name="94" href="#94">94</a> <strong>protected</strong> <a href="../../../../org/archive/io/warc/WARCRecord.html">WARCRecord</a> createArchiveRecord(InputStream is, <strong>long</strong> offset)<a name="95" href="#95">95</a> throws IOException {<a name="96" href="#96">96</a> <strong>return</strong> (WARCRecord)currentRecord(<strong>new</strong> WARCRecord(is,<a name="97" href="#97">97</a> getReaderIdentifier(), offset, isDigest(), isStrict()));<a name="98" href="#98">98</a> }<a name="99" href="#99">99</a> <a name="100" href="#100">100</a> @Override<a name="101" href="#101">101</a> <strong>public</strong> <strong>void</strong> dump(<strong>boolean</strong> compress)<a name="102" href="#102">102</a> throws IOException, java.text.ParseException {<a name="103" href="#103">103</a> <strong>for</strong> (<strong>final</strong> Iterator<ArchiveRecord> i = iterator(); i.hasNext();) {<a name="104" href="#104">104</a> <a href="../../../../org/archive/io/ArchiveRecord.html">ArchiveRecord</a> r = i.next();<a name="105" href="#105">105</a> System.out.println(r.getHeader().toString());<a name="106" href="#106">106</a> r.dump();<a name="107" href="#107">107</a> System.out.println();<a name="108" href="#108">108</a> }<a name="109" href="#109">109</a> }<a name="110" href="#110">110</a> <a name="111" href="#111">111</a> @Override<a name="112" href="#112">112</a> <strong>public</strong> String getDotFileExtension() {<a name="113" href="#113">113</a> <strong>return</strong> DOT_WARC_FILE_EXTENSION;<a name="114" href="#114">114</a> }<a name="115" href="#115">115</a> <a name="116" href="#116">116</a> @Override<a name="117" href="#117">117</a> <strong>public</strong> String getFileExtension() {<a name="118" href="#118">118</a> <strong>return</strong> WARC_FILE_EXTENSION;<a name="119" href="#119">119</a> } <a name="120" href="#120">120</a> <a name="121" href="#121">121</a> <em class="comment">// Static methods follow. Mostly for command-line processing.</em><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> *</em><a name="125" href="#125">125</a> <em> * @param formatter Help formatter instance.</em><a name="126" href="#126">126</a> <em> * @param options Usage options.</em><a name="127" href="#127">127</a> <em> * @param exitCode Exit code.</em><a name="128" href="#128">128</a> <em> */</em><a name="129" href="#129">129</a> <strong>private</strong> <strong>static</strong> <strong>void</strong> usage(HelpFormatter formatter, Options options,<a name="130" href="#130">130</a> <strong>int</strong> exitCode) {<a name="131" href="#131">131</a> formatter.printHelp(<span class="string">"java org.archive.io.arc.WARCReader"</span> +<a name="132" href="#132">132</a> <span class="string">" [--digest=true|false] //\n"</span> +<a name="133" href="#133">133</a> <span class="string">" [--format=cdx|cdxfile|dump|gzipdump]"</span> +<a name="134" href="#134">134</a> <span class="string">" [--offset=#] //\n[--strict] [--parse] WARC_FILE|WARC_URL"</span>,<a name="135" href="#135">135</a> options);<a name="136" href="#136">136</a> System.exit(exitCode);<a name="137" href="#137">137</a> }<a name="138" href="#138">138</a> <a name="139" href="#139">139</a> <em>/**<em>*</em></em><a name="140" href="#140">140</a> <em> * Write out the arcfile.</em><a name="141" href="#141">141</a> <em> * </em><a name="142" href="#142">142</a> <em> * @param reader</em><a name="143" href="#143">143</a> <em> * @param format Format to use outputting.</em><a name="144" href="#144">144</a> <em> * @throws IOException</em><a name="145" href="#145">145</a> <em> * @throws java.text.ParseException</em><a name="146" href="#146">146</a> <em> */</em><a name="147" href="#147">147</a> <strong>protected</strong> <strong>static</strong> <strong>void</strong> output(<a href="../../../../org/archive/io/warc/WARCReader.html">WARCReader</a> reader, String format)<a name="148" href="#148">148</a> throws IOException, java.text.ParseException {<a name="149" href="#149">149</a> <strong>if</strong> (!reader.output(format)) {<a name="150" href="#150">150</a> <strong>throw</strong> <strong>new</strong> IOException(<span class="string">"Unsupported format: "</span> + format);<a name="151" href="#151">151</a> }<a name="152" href="#152">152</a> }⌨️ 快捷键说明
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