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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>BloomFilter xref</title><link type="text/css" rel="stylesheet" href="../../../stylesheet.css" /></head><body><div id="overview"><a href="../../../../apidocs/org/archive/util/BloomFilter.html">View Javadoc</a></div><pre><a name="1" href="#1">1</a> <em class="comment">/*<em class="comment"> BloomFilter</em></em><a name="2" href="#2">2</a> <em class="comment">*</em><a name="3" href="#3">3</a> <em class="comment">* $Id: BloomFilter.java 3655 2005-07-05 19:20:03Z gojomo $</em><a name="4" href="#4">4</a> <em class="comment">*</em><a name="5" href="#5">5</a> <em class="comment">* Created on Jun 30, 2005</em><a name="6" href="#6">6</a> <em class="comment">*</em><a name="7" href="#7">7</a> <em class="comment">* Copyright (C) 2005 Internet Archive; an adaptation of</em><a name="8" href="#8">8</a> <em class="comment">* LGPL work (C) Sebastiano Vigna</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> <a name="27" href="#27">27</a> <strong>package</strong> <a href="../../../org/archive/util/package-summary.html">org.archive.util</a>;<a name="28" href="#28">28</a> <a name="29" href="#29">29</a> <em>/**<em>*</em></em><a name="30" href="#30">30</a> <em> * Common interface for different Bloom filter </em><a name="31" href="#31">31</a> <em> * implementations</em><a name="32" href="#32">32</a> <em> * </em><a name="33" href="#33">33</a> <em> * @author Gordon Mohr</em><a name="34" href="#34">34</a> <em> */</em><a name="35" href="#35">35</a> <strong>public</strong> <strong>interface</strong> <a href="../../../org/archive/util/BloomFilter.html">BloomFilter</a> {<a name="36" href="#36">36</a> <em>/**<em>* The number of character sequences in the filter.</em></em><a name="37" href="#37">37</a> <em> *</em><a name="38" href="#38">38</a> <em> * @return the number of character sequences in the filter (but see {@link #contains(CharSequence)}).</em><a name="39" href="#39">39</a> <em> */</em><a name="40" href="#40">40</a> <strong>public</strong> <strong>abstract</strong> <strong>int</strong> size();<a name="41" href="#41">41</a> <a name="42" href="#42">42</a> <em>/**<em>* Checks whether the given character sequence is in this filter.</em></em><a name="43" href="#43">43</a> <em> *</em><a name="44" href="#44">44</a> <em> * <P>Note that this method may return true on a character sequence that is has</em><a name="45" href="#45">45</a> <em> * not been added to the filter. This will happen with probability 2<sub>-<var>d</var></sub>,</em><a name="46" href="#46">46</a> <em> * where <var>d</var> is the number of hash functions specified at creation time, if</em><a name="47" href="#47">47</a> <em> * the number of the elements in the filter is less than <var>n</var>, the number</em><a name="48" href="#48">48</a> <em> * of expected elements specified at creation time.</em><a name="49" href="#49">49</a> <em> *</em><a name="50" href="#50">50</a> <em> * @param s a character sequence.</em><a name="51" href="#51">51</a> <em> * @return true if the sequence is in the filter (or if a sequence with the</em><a name="52" href="#52">52</a> <em> * same hash sequence is in the filter).</em><a name="53" href="#53">53</a> <em> */</em><a name="54" href="#54">54</a> <strong>public</strong> <strong>abstract</strong> <strong>boolean</strong> contains(<strong>final</strong> CharSequence s);<a name="55" href="#55">55</a> <a name="56" href="#56">56</a> <em>/**<em>* Adds a character sequence to the filter.</em></em><a name="57" href="#57">57</a> <em> *</em><a name="58" href="#58">58</a> <em> * @param s a character sequence.</em><a name="59" href="#59">59</a> <em> * @return true if the character sequence was not in the filter (but see {@link #contains(CharSequence)}).</em><a name="60" href="#60">60</a> <em> */</em><a name="61" href="#61">61</a> <strong>public</strong> <strong>abstract</strong> <strong>boolean</strong> add(<strong>final</strong> CharSequence s);<a name="62" href="#62">62</a> <a name="63" href="#63">63</a> <em>/**<em>*</em></em><a name="64" href="#64">64</a> <em> * The amount of memory in bytes consumed by the bloom </em><a name="65" href="#65">65</a> <em> * bitfield.</em><a name="66" href="#66">66</a> <em> *</em><a name="67" href="#67">67</a> <em> * @return memory used by bloom bitfield, in bytes</em><a name="68" href="#68">68</a> <em> */</em><a name="69" href="#69">69</a> <strong>public</strong> <strong>abstract</strong> <strong>long</strong> getSizeBytes();<a name="70" href="#70">70</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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