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+<div id="overview"><a href="../../../../../../../../../../../../ai-workspace/target/site/apidocs/org/apache/james/ai/classic/BayesianAnalyzer.html">View Javadoc</a></div><pre>
+
+<a class="jxr_linenumber" name="1" href="#1">1</a> <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment">**************************************************************</em>
+<a class="jxr_linenumber" name="2" href="#2">2</a> <em class="jxr_javadoccomment"> * Licensed to the Apache Software Foundation (ASF) under one *</em>
+<a class="jxr_linenumber" name="3" href="#3">3</a> <em class="jxr_javadoccomment"> * or more contributor license agreements. See the NOTICE file *</em>
+<a class="jxr_linenumber" name="4" href="#4">4</a> <em class="jxr_javadoccomment"> * distributed with this work for additional information *</em>
+<a class="jxr_linenumber" name="5" href="#5">5</a> <em class="jxr_javadoccomment"> * regarding copyright ownership. The ASF licenses this file *</em>
+<a class="jxr_linenumber" name="6" href="#6">6</a> <em class="jxr_javadoccomment"> * to you under the Apache License, Version 2.0 (the *</em>
+<a class="jxr_linenumber" name="7" href="#7">7</a> <em class="jxr_javadoccomment"> * "License"); you may not use this file except in compliance *</em>
+<a class="jxr_linenumber" name="8" href="#8">8</a> <em class="jxr_javadoccomment"> * with the License. You may obtain a copy of the License at *</em>
+<a class="jxr_linenumber" name="9" href="#9">9</a> <em class="jxr_javadoccomment"> * *</em>
+<a class="jxr_linenumber" name="10" href="#10">10</a> <em class="jxr_javadoccomment"> * <a href="http://www.apache.org/licenses/LICENSE-2.0" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0</a> *</em>
+<a class="jxr_linenumber" name="11" href="#11">11</a> <em class="jxr_javadoccomment"> * *</em>
+<a class="jxr_linenumber" name="12" href="#12">12</a> <em class="jxr_javadoccomment"> * Unless required by applicable law or agreed to in writing, *</em>
+<a class="jxr_linenumber" name="13" href="#13">13</a> <em class="jxr_javadoccomment"> * software distributed under the License is distributed on an *</em>
+<a class="jxr_linenumber" name="14" href="#14">14</a> <em class="jxr_javadoccomment"> * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY *</em>
+<a class="jxr_linenumber" name="15" href="#15">15</a> <em class="jxr_javadoccomment"> * KIND, either express or implied. See the License for the *</em>
+<a class="jxr_linenumber" name="16" href="#16">16</a> <em class="jxr_javadoccomment"> * specific language governing permissions and limitations *</em>
+<a class="jxr_linenumber" name="17" href="#17">17</a> <em class="jxr_javadoccomment"> * under the License. *</em>
+<a class="jxr_linenumber" name="18" href="#18">18</a> <em class="jxr_javadoccomment"> ****************************************************************/</em>
+<a class="jxr_linenumber" name="19" href="#19">19</a>
+<a class="jxr_linenumber" name="20" href="#20">20</a> <strong class="jxr_keyword">package</strong> org.apache.james.ai.classic;
+<a class="jxr_linenumber" name="21" href="#21">21</a>
+<a class="jxr_linenumber" name="22" href="#22">22</a> <strong class="jxr_keyword">import</strong> java.io.IOException;
+<a class="jxr_linenumber" name="23" href="#23">23</a> <strong class="jxr_keyword">import</strong> java.io.Reader;
+<a class="jxr_linenumber" name="24" href="#24">24</a> <strong class="jxr_keyword">import</strong> java.util.ArrayList;
+<a class="jxr_linenumber" name="25" href="#25">25</a> <strong class="jxr_keyword">import</strong> java.util.Collection;
+<a class="jxr_linenumber" name="26" href="#26">26</a> <strong class="jxr_keyword">import</strong> java.util.HashMap;
+<a class="jxr_linenumber" name="27" href="#27">27</a> <strong class="jxr_keyword">import</strong> java.util.HashSet;
+<a class="jxr_linenumber" name="28" href="#28">28</a> <strong class="jxr_keyword">import</strong> java.util.Iterator;
+<a class="jxr_linenumber" name="29" href="#29">29</a> <strong class="jxr_keyword">import</strong> java.util.Map;
+<a class="jxr_linenumber" name="30" href="#30">30</a> <strong class="jxr_keyword">import</strong> java.util.Set;
+<a class="jxr_linenumber" name="31" href="#31">31</a> <strong class="jxr_keyword">import</strong> java.util.SortedSet;
+<a class="jxr_linenumber" name="32" href="#32">32</a> <strong class="jxr_keyword">import</strong> java.util.TreeSet;
+<a class="jxr_linenumber" name="33" href="#33">33</a>
+<a class="jxr_linenumber" name="34" href="#34">34</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="35" href="#35">35</a> <em class="jxr_javadoccomment"> * <p></em>
+<a class="jxr_linenumber" name="36" href="#36">36</a> <em class="jxr_javadoccomment"> * Determines probability that text contains Spam.</em>
+<a class="jxr_linenumber" name="37" href="#37">37</a> <em class="jxr_javadoccomment"> * </p></em>
+<a class="jxr_linenumber" name="38" href="#38">38</a> <em class="jxr_javadoccomment"> * </em>
+<a class="jxr_linenumber" name="39" href="#39">39</a> <em class="jxr_javadoccomment"> * <p></em>
+<a class="jxr_linenumber" name="40" href="#40">40</a> <em class="jxr_javadoccomment"> * Based upon Paul Grahams' <a href="<a href="http://www.paulgraham.com/spam.html" target="alexandria_uri">http://www.paulgraham.com/spam.html</a>">A Plan</em>
+<a class="jxr_linenumber" name="41" href="#41">41</a> <em class="jxr_javadoccomment"> * for Spam</a>. Extended to Paul Grahams' <a</em>
+<a class="jxr_linenumber" name="42" href="#42">42</a> <em class="jxr_javadoccomment"> * href="<a href="http://paulgraham.com/better.html" target="alexandria_uri">http://paulgraham.com/better.html</a>">Better Bayesian Filtering</a>.</em>
+<a class="jxr_linenumber" name="43" href="#43">43</a> <em class="jxr_javadoccomment"> * </p></em>
+<a class="jxr_linenumber" name="44" href="#44">44</a> <em class="jxr_javadoccomment"> * </em>
+<a class="jxr_linenumber" name="45" href="#45">45</a> <em class="jxr_javadoccomment"> * <p></em>
+<a class="jxr_linenumber" name="46" href="#46">46</a> <em class="jxr_javadoccomment"> * Sample method usage:</em>
+<a class="jxr_linenumber" name="47" href="#47">47</a> <em class="jxr_javadoccomment"> * </p></em>
+<a class="jxr_linenumber" name="48" href="#48">48</a> <em class="jxr_javadoccomment"> * </em>
+<a class="jxr_linenumber" name="49" href="#49">49</a> <em class="jxr_javadoccomment"> * <p></em>
+<a class="jxr_linenumber" name="50" href="#50">50</a> <em class="jxr_javadoccomment"> * Use: void addHam(Reader) and void addSpam(Reader)</em>
+<a class="jxr_linenumber" name="51" href="#51">51</a> <em class="jxr_javadoccomment"> * </em>
+<a class="jxr_linenumber" name="52" href="#52">52</a> <em class="jxr_javadoccomment"> * methods to build up the Maps of ham & spam tokens/occurrences. Both addHam</em>
+<a class="jxr_linenumber" name="53" href="#53">53</a> <em class="jxr_javadoccomment"> * and addSpam assume they're reading one message at a time, if you feed more</em>
+<a class="jxr_linenumber" name="54" href="#54">54</a> <em class="jxr_javadoccomment"> * than one message per call, be sure to adjust the appropriate message counter:</em>
+<a class="jxr_linenumber" name="55" href="#55">55</a> <em class="jxr_javadoccomment"> * hamMessageCount or spamMessageCount.</em>
+<a class="jxr_linenumber" name="56" href="#56">56</a> <em class="jxr_javadoccomment"> * </em>
+<a class="jxr_linenumber" name="57" href="#57">57</a> <em class="jxr_javadoccomment"> * Then...</em>
+<a class="jxr_linenumber" name="58" href="#58">58</a> <em class="jxr_javadoccomment"> * </p></em>
+<a class="jxr_linenumber" name="59" href="#59">59</a> <em class="jxr_javadoccomment"> * </em>
+<a class="jxr_linenumber" name="60" href="#60">60</a> <em class="jxr_javadoccomment"> * <p></em>
+<a class="jxr_linenumber" name="61" href="#61">61</a> <em class="jxr_javadoccomment"> * Use: void buildCorpus()</em>
+<a class="jxr_linenumber" name="62" href="#62">62</a> <em class="jxr_javadoccomment"> * </em>
+<a class="jxr_linenumber" name="63" href="#63">63</a> <em class="jxr_javadoccomment"> * to build the final token/probabilities Map.</em>
+<a class="jxr_linenumber" name="64" href="#64">64</a> <em class="jxr_javadoccomment"> * </em>
+<a class="jxr_linenumber" name="65" href="#65">65</a> <em class="jxr_javadoccomment"> * Use your own methods for persistent storage of either the individual ham/spam</em>
+<a class="jxr_linenumber" name="66" href="#66">66</a> <em class="jxr_javadoccomment"> * corpus & message counts, and/or the final corpus.</em>
+<a class="jxr_linenumber" name="67" href="#67">67</a> <em class="jxr_javadoccomment"> * </em>
+<a class="jxr_linenumber" name="68" href="#68">68</a> <em class="jxr_javadoccomment"> * Then you can...</em>
+<a class="jxr_linenumber" name="69" href="#69">69</a> <em class="jxr_javadoccomment"> * </p></em>
+<a class="jxr_linenumber" name="70" href="#70">70</a> <em class="jxr_javadoccomment"> * </em>
+<a class="jxr_linenumber" name="71" href="#71">71</a> <em class="jxr_javadoccomment"> * <p></em>
+<a class="jxr_linenumber" name="72" href="#72">72</a> <em class="jxr_javadoccomment"> * Use: double computeSpamProbability(Reader)</em>
+<a class="jxr_linenumber" name="73" href="#73">73</a> <em class="jxr_javadoccomment"> * </em>
+<a class="jxr_linenumber" name="74" href="#74">74</a> <em class="jxr_javadoccomment"> * to determine the probability that a particular text contains spam. A returned</em>
+<a class="jxr_linenumber" name="75" href="#75">75</a> <em class="jxr_javadoccomment"> * result of 0.9 or above is an indicator that the text was spam.</em>
+<a class="jxr_linenumber" name="76" href="#76">76</a> <em class="jxr_javadoccomment"> * </p></em>
+<a class="jxr_linenumber" name="77" href="#77">77</a> <em class="jxr_javadoccomment"> * </em>
+<a class="jxr_linenumber" name="78" href="#78">78</a> <em class="jxr_javadoccomment"> * <p></em>
+<a class="jxr_linenumber" name="79" href="#79">79</a> <em class="jxr_javadoccomment"> * If you use persistent storage, use: void setCorpus(Map)</em>
+<a class="jxr_linenumber" name="80" href="#80">80</a> <em class="jxr_javadoccomment"> * </em>
+<a class="jxr_linenumber" name="81" href="#81">81</a> <em class="jxr_javadoccomment"> * before calling computeSpamProbability.</em>
+<a class="jxr_linenumber" name="82" href="#82">82</a> <em class="jxr_javadoccomment"> * </p></em>
+<a class="jxr_linenumber" name="83" href="#83">83</a> <em class="jxr_javadoccomment"> * </em>
+<a class="jxr_linenumber" name="84" href="#84">84</a> <em class="jxr_javadoccomment"> * @since 2.3.0</em>
+<a class="jxr_linenumber" name="85" href="#85">85</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="86" href="#86">86</a>
+<a class="jxr_linenumber" name="87" href="#87">87</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../../org/apache/james/ai/classic/BayesianAnalyzer.html">BayesianAnalyzer</a> {
+<a class="jxr_linenumber" name="88" href="#88">88</a>
+<a class="jxr_linenumber" name="89" href="#89">89</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="90" href="#90">90</a> <em class="jxr_javadoccomment"> * Number of "interesting" tokens to use to compute overall spamminess</em>
+<a class="jxr_linenumber" name="91" href="#91">91</a> <em class="jxr_javadoccomment"> * probability.</em>
+<a class="jxr_linenumber" name="92" href="#92">92</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="93" href="#93">93</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">int</strong> MAX_INTERESTING_TOKENS = 15;
+<a class="jxr_linenumber" name="94" href="#94">94</a>
+<a class="jxr_linenumber" name="95" href="#95">95</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="96" href="#96">96</a> <em class="jxr_javadoccomment"> * Minimum probability distance from 0.5 to consider a token "interesting"</em>
+<a class="jxr_linenumber" name="97" href="#97">97</a> <em class="jxr_javadoccomment"> * to use to compute overall spamminess probability.</em>
+<a class="jxr_linenumber" name="98" href="#98">98</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="99" href="#99">99</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">double</strong> INTERESTINGNESS_THRESHOLD = 0.46;
+<a class="jxr_linenumber" name="100" href="#100">100</a>
+<a class="jxr_linenumber" name="101" href="#101">101</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="102" href="#102">102</a> <em class="jxr_javadoccomment"> * Default token probability to use when a token has not been encountered</em>
+<a class="jxr_linenumber" name="103" href="#103">103</a> <em class="jxr_javadoccomment"> * before.</em>
+<a class="jxr_linenumber" name="104" href="#104">104</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="105" href="#105">105</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">double</strong> DEFAULT_TOKEN_PROBABILITY = 0.4;
+<a class="jxr_linenumber" name="106" href="#106">106</a>
+<a class="jxr_linenumber" name="107" href="#107">107</a> <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Map of ham tokens and their occurrences. */</em>
+<a class="jxr_linenumber" name="108" href="#108">108</a> <strong class="jxr_keyword">private</strong> Map<String, Integer> hamTokenCounts = <strong class="jxr_keyword">new</strong> HashMap<String, Integer>();
+<a class="jxr_linenumber" name="109" href="#109">109</a>
+<a class="jxr_linenumber" name="110" href="#110">110</a> <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Map of spam tokens and their occurrences. */</em>
+<a class="jxr_linenumber" name="111" href="#111">111</a> <strong class="jxr_keyword">private</strong> Map<String, Integer> spamTokenCounts = <strong class="jxr_keyword">new</strong> HashMap<String, Integer>();
+<a class="jxr_linenumber" name="112" href="#112">112</a>
+<a class="jxr_linenumber" name="113" href="#113">113</a> <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Number of ham messages analyzed. */</em>
+<a class="jxr_linenumber" name="114" href="#114">114</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">int</strong> hamMessageCount = 0;
+<a class="jxr_linenumber" name="115" href="#115">115</a>
+<a class="jxr_linenumber" name="116" href="#116">116</a> <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Number of spam messages analyzed. */</em>
+<a class="jxr_linenumber" name="117" href="#117">117</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">int</strong> spamMessageCount = 0;
+<a class="jxr_linenumber" name="118" href="#118">118</a>
+<a class="jxr_linenumber" name="119" href="#119">119</a> <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Final token/probability corpus. */</em>
+<a class="jxr_linenumber" name="120" href="#120">120</a> <strong class="jxr_keyword">private</strong> Map<String, Double> corpus = <strong class="jxr_keyword">new</strong> HashMap<String, Double>();
+<a class="jxr_linenumber" name="121" href="#121">121</a>
+<a class="jxr_linenumber" name="122" href="#122">122</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="123" href="#123">123</a> <em class="jxr_javadoccomment"> * Inner class for managing Token Probability Strengths during the</em>
+<a class="jxr_linenumber" name="124" href="#124">124</a> <em class="jxr_javadoccomment"> * computeSpamProbability phase.</em>
+<a class="jxr_linenumber" name="125" href="#125">125</a> <em class="jxr_javadoccomment"> * </em>
+<a class="jxr_linenumber" name="126" href="#126">126</a> <em class="jxr_javadoccomment"> * By probability <i>strength</i> we mean the absolute distance of a</em>
+<a class="jxr_linenumber" name="127" href="#127">127</a> <em class="jxr_javadoccomment"> * probability from the middle value 0.5.</em>
+<a class="jxr_linenumber" name="128" href="#128">128</a> <em class="jxr_javadoccomment"> * </em>
+<a class="jxr_linenumber" name="129" href="#129">129</a> <em class="jxr_javadoccomment"> * It implements Comparable so that it's sorting is automatic.</em>
+<a class="jxr_linenumber" name="130" href="#130">130</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="131" href="#131">131</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../../org/apache/james/ai/classic/BayesianAnalyzer.html">TokenProbabilityStrength</a> <strong class="jxr_keyword">implements</strong> Comparable<TokenProbabilityStrength> {
+<a class="jxr_linenumber" name="132" href="#132">132</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="133" href="#133">133</a> <em class="jxr_javadoccomment"> * Message token.</em>
+<a class="jxr_linenumber" name="134" href="#134">134</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="135" href="#135">135</a> String token = <strong class="jxr_keyword">null</strong>;
+<a class="jxr_linenumber" name="136" href="#136">136</a>
+<a class="jxr_linenumber" name="137" href="#137">137</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="138" href="#138">138</a> <em class="jxr_javadoccomment"> * Token's computed probability strength.</em>
+<a class="jxr_linenumber" name="139" href="#139">139</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="140" href="#140">140</a> <strong class="jxr_keyword">double</strong> strength = Math.abs(0.5 - DEFAULT_TOKEN_PROBABILITY);
+<a class="jxr_linenumber" name="141" href="#141">141</a>
+<a class="jxr_linenumber" name="142" href="#142">142</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="143" href="#143">143</a> <em class="jxr_javadoccomment"> * Force the natural sort order for this object to be high-to-low.</em>
+<a class="jxr_linenumber" name="144" href="#144">144</a> <em class="jxr_javadoccomment"> * </em>
+<a class="jxr_linenumber" name="145" href="#145">145</a> <em class="jxr_javadoccomment"> * @param anotherTokenProbabilityStrength</em>
+<a class="jxr_linenumber" name="146" href="#146">146</a> <em class="jxr_javadoccomment"> * A TokenProbabilityStrength instance to compare this</em>
+<a class="jxr_linenumber" name="147" href="#147">147</a> <em class="jxr_javadoccomment"> * instance with.</em>
+<a class="jxr_linenumber" name="148" href="#148">148</a> <em class="jxr_javadoccomment"> * </em>
+<a class="jxr_linenumber" name="149" href="#149">149</a> <em class="jxr_javadoccomment"> * @return The result of the comparison (before, equal, after).</em>
+<a class="jxr_linenumber" name="150" href="#150">150</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="151" href="#151">151</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> compareTo(<a href="../../../../../org/apache/james/ai/classic/BayesianAnalyzer.html">TokenProbabilityStrength</a> anotherTokenProbabilityStrength) {
+<a class="jxr_linenumber" name="152" href="#152">152</a> <strong class="jxr_keyword">int</strong> result = (<strong class="jxr_keyword">int</strong>) ((((TokenProbabilityStrength) anotherTokenProbabilityStrength).strength - strength) * 1000000);
+<a class="jxr_linenumber" name="153" href="#153">153</a> <strong class="jxr_keyword">if</strong> (result == 0) {
+<a class="jxr_linenumber" name="154" href="#154">154</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">this</strong>.token.compareTo(((TokenProbabilityStrength) anotherTokenProbabilityStrength).token);
+<a class="jxr_linenumber" name="155" href="#155">155</a> } <strong class="jxr_keyword">else</strong> {
+<a class="jxr_linenumber" name="156" href="#156">156</a> <strong class="jxr_keyword">return</strong> result;
+<a class="jxr_linenumber" name="157" href="#157">157</a> }
+<a class="jxr_linenumber" name="158" href="#158">158</a> }
+<a class="jxr_linenumber" name="159" href="#159">159</a>
+<a class="jxr_linenumber" name="160" href="#160">160</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="161" href="#161">161</a> <em class="jxr_javadoccomment"> * Simple toString () implementation mostly for debugging purposes.</em>
+<a class="jxr_linenumber" name="162" href="#162">162</a> <em class="jxr_javadoccomment"> * </em>
+<a class="jxr_linenumber" name="163" href="#163">163</a> <em class="jxr_javadoccomment"> * @return String representation of this object.</em>
+<a class="jxr_linenumber" name="164" href="#164">164</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="165" href="#165">165</a> <strong class="jxr_keyword">public</strong> String toString() {
+<a class="jxr_linenumber" name="166" href="#166">166</a> StringBuffer sb = <strong class="jxr_keyword">new</strong> StringBuffer(30);
+<a class="jxr_linenumber" name="167" href="#167">167</a>
+<a class="jxr_linenumber" name="168" href="#168">168</a> sb.append(token).append(<span class="jxr_string">"="</span>).append(strength);
+<a class="jxr_linenumber" name="169" href="#169">169</a>
+<a class="jxr_linenumber" name="170" href="#170">170</a> <strong class="jxr_keyword">return</strong> sb.toString();
+<a class="jxr_linenumber" name="171" href="#171">171</a> }
+<a class="jxr_linenumber" name="172" href="#172">172</a> }
+<a class="jxr_linenumber" name="173" href="#173">173</a>
+<a class="jxr_linenumber" name="174" href="#174">174</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="175" href="#175">175</a> <em class="jxr_javadoccomment"> * Basic class constructor.</em>
+<a class="jxr_linenumber" name="176" href="#176">176</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="177" href="#177">177</a> <strong class="jxr_keyword">public</strong> <a href="../../../../../org/apache/james/ai/classic/BayesianAnalyzer.html">BayesianAnalyzer</a>() {
+<a class="jxr_linenumber" name="178" href="#178">178</a> }
+<a class="jxr_linenumber" name="179" href="#179">179</a>
+<a class="jxr_linenumber" name="180" href="#180">180</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="181" href="#181">181</a> <em class="jxr_javadoccomment"> * Public setter for the hamTokenCounts Map.</em>
+<a class="jxr_linenumber" name="182" href="#182">182</a> <em class="jxr_javadoccomment"> * </em>
+<a class="jxr_linenumber" name="183" href="#183">183</a> <em class="jxr_javadoccomment"> * @param hamTokenCounts</em>
+<a class="jxr_linenumber" name="184" href="#184">184</a> <em class="jxr_javadoccomment"> * The new ham Token counts Map.</em>
+<a class="jxr_linenumber" name="185" href="#185">185</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="186" href="#186">186</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> setHamTokenCounts(Map<String, Integer> hamTokenCounts) {
+<a class="jxr_linenumber" name="187" href="#187">187</a> <strong class="jxr_keyword">this</strong>.hamTokenCounts = hamTokenCounts;
+<a class="jxr_linenumber" name="188" href="#188">188</a> }
+<a class="jxr_linenumber" name="189" href="#189">189</a>
+<a class="jxr_linenumber" name="190" href="#190">190</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="191" href="#191">191</a> <em class="jxr_javadoccomment"> * Public getter for the hamTokenCounts Map.</em>
+<a class="jxr_linenumber" name="192" href="#192">192</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="193" href="#193">193</a> <strong class="jxr_keyword">public</strong> Map<String, Integer> getHamTokenCounts() {
+<a class="jxr_linenumber" name="194" href="#194">194</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">this</strong>.hamTokenCounts;
+<a class="jxr_linenumber" name="195" href="#195">195</a> }
+<a class="jxr_linenumber" name="196" href="#196">196</a>
+<a class="jxr_linenumber" name="197" href="#197">197</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="198" href="#198">198</a> <em class="jxr_javadoccomment"> * Public setter for the spamTokenCounts Map.</em>
+<a class="jxr_linenumber" name="199" href="#199">199</a> <em class="jxr_javadoccomment"> * </em>
+<a class="jxr_linenumber" name="200" href="#200">200</a> <em class="jxr_javadoccomment"> * @param spamTokenCounts</em>
+<a class="jxr_linenumber" name="201" href="#201">201</a> <em class="jxr_javadoccomment"> * The new spam Token counts Map.</em>
+<a class="jxr_linenumber" name="202" href="#202">202</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="203" href="#203">203</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> setSpamTokenCounts(Map<String, Integer> spamTokenCounts) {
+<a class="jxr_linenumber" name="204" href="#204">204</a> <strong class="jxr_keyword">this</strong>.spamTokenCounts = spamTokenCounts;
+<a class="jxr_linenumber" name="205" href="#205">205</a> }
+<a class="jxr_linenumber" name="206" href="#206">206</a>
+<a class="jxr_linenumber" name="207" href="#207">207</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="208" href="#208">208</a> <em class="jxr_javadoccomment"> * Public getter for the spamTokenCounts Map.</em>
+<a class="jxr_linenumber" name="209" href="#209">209</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="210" href="#210">210</a> <strong class="jxr_keyword">public</strong> Map<String, Integer> getSpamTokenCounts() {
+<a class="jxr_linenumber" name="211" href="#211">211</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">this</strong>.spamTokenCounts;
+<a class="jxr_linenumber" name="212" href="#212">212</a> }
+<a class="jxr_linenumber" name="213" href="#213">213</a>
+<a class="jxr_linenumber" name="214" href="#214">214</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="215" href="#215">215</a> <em class="jxr_javadoccomment"> * Public setter for spamMessageCount.</em>
+<a class="jxr_linenumber" name="216" href="#216">216</a> <em class="jxr_javadoccomment"> * </em>
+<a class="jxr_linenumber" name="217" href="#217">217</a> <em class="jxr_javadoccomment"> * @param spamMessageCount</em>
+<a class="jxr_linenumber" name="218" href="#218">218</a> <em class="jxr_javadoccomment"> * The new spam message count.</em>
+<a class="jxr_linenumber" name="219" href="#219">219</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="220" href="#220">220</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> setSpamMessageCount(<strong class="jxr_keyword">int</strong> spamMessageCount) {
+<a class="jxr_linenumber" name="221" href="#221">221</a> <strong class="jxr_keyword">this</strong>.spamMessageCount = spamMessageCount;
+<a class="jxr_linenumber" name="222" href="#222">222</a> }
+<a class="jxr_linenumber" name="223" href="#223">223</a>
+<a class="jxr_linenumber" name="224" href="#224">224</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="225" href="#225">225</a> <em class="jxr_javadoccomment"> * Public getter for spamMessageCount.</em>
+<a class="jxr_linenumber" name="226" href="#226">226</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="227" href="#227">227</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">int</strong> getSpamMessageCount() {
+<a class="jxr_linenumber" name="228" href="#228">228</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">this</strong>.spamMessageCount;
+<a class="jxr_linenumber" name="229" href="#229">229</a> }
+<a class="jxr_linenumber" name="230" href="#230">230</a>
+<a class="jxr_linenumber" name="231" href="#231">231</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="232" href="#232">232</a> <em class="jxr_javadoccomment"> * Public setter for hamMessageCount.</em>
+<a class="jxr_linenumber" name="233" href="#233">233</a> <em class="jxr_javadoccomment"> * </em>
+<a class="jxr_linenumber" name="234" href="#234">234</a> <em class="jxr_javadoccomment"> * @param hamMessageCount</em>
+<a class="jxr_linenumber" name="235" href="#235">235</a> <em class="jxr_javadoccomment"> * The new ham message count.</em>
+<a class="jxr_linenumber" name="236" href="#236">236</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="237" href="#237">237</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> setHamMessageCount(<strong class="jxr_keyword">int</strong> hamMessageCount) {
+<a class="jxr_linenumber" name="238" href="#238">238</a> <strong class="jxr_keyword">this</strong>.hamMessageCount = hamMessageCount;
+<a class="jxr_linenumber" name="239" href="#239">239</a> }
+<a class="jxr_linenumber" name="240" href="#240">240</a>
+<a class="jxr_linenumber" name="241" href="#241">241</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="242" href="#242">242</a> <em class="jxr_javadoccomment"> * Public getter for hamMessageCount.</em>
+<a class="jxr_linenumber" name="243" href="#243">243</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="244" href="#244">244</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">int</strong> getHamMessageCount() {
+<a class="jxr_linenumber" name="245" href="#245">245</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">this</strong>.hamMessageCount;
+<a class="jxr_linenumber" name="246" href="#246">246</a> }
+<a class="jxr_linenumber" name="247" href="#247">247</a>
+<a class="jxr_linenumber" name="248" href="#248">248</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="249" href="#249">249</a> <em class="jxr_javadoccomment"> * Clears all analysis repositories and counters.</em>
+<a class="jxr_linenumber" name="250" href="#250">250</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="251" href="#251">251</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> clear() {
+<a class="jxr_linenumber" name="252" href="#252">252</a> corpus.clear();
+<a class="jxr_linenumber" name="253" href="#253">253</a>
+<a class="jxr_linenumber" name="254" href="#254">254</a> tokenCountsClear();
+<a class="jxr_linenumber" name="255" href="#255">255</a>
+<a class="jxr_linenumber" name="256" href="#256">256</a> hamMessageCount = 0;
+<a class="jxr_linenumber" name="257" href="#257">257</a> spamMessageCount = 0;
+<a class="jxr_linenumber" name="258" href="#258">258</a> }
+<a class="jxr_linenumber" name="259" href="#259">259</a>
+<a class="jxr_linenumber" name="260" href="#260">260</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="261" href="#261">261</a> <em class="jxr_javadoccomment"> * Clears token counters.</em>
+<a class="jxr_linenumber" name="262" href="#262">262</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="263" href="#263">263</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> tokenCountsClear() {
+<a class="jxr_linenumber" name="264" href="#264">264</a> hamTokenCounts.clear();
+<a class="jxr_linenumber" name="265" href="#265">265</a> spamTokenCounts.clear();
+<a class="jxr_linenumber" name="266" href="#266">266</a> }
+<a class="jxr_linenumber" name="267" href="#267">267</a>
+<a class="jxr_linenumber" name="268" href="#268">268</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="269" href="#269">269</a> <em class="jxr_javadoccomment"> * Public setter for corpus.</em>
+<a class="jxr_linenumber" name="270" href="#270">270</a> <em class="jxr_javadoccomment"> * </em>
+<a class="jxr_linenumber" name="271" href="#271">271</a> <em class="jxr_javadoccomment"> * @param corpus</em>
+<a class="jxr_linenumber" name="272" href="#272">272</a> <em class="jxr_javadoccomment"> * The new corpus.</em>
+<a class="jxr_linenumber" name="273" href="#273">273</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="274" href="#274">274</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> setCorpus(Map<String, Double> corpus) {
+<a class="jxr_linenumber" name="275" href="#275">275</a> <strong class="jxr_keyword">this</strong>.corpus = corpus;
+<a class="jxr_linenumber" name="276" href="#276">276</a> }
+<a class="jxr_linenumber" name="277" href="#277">277</a>
+<a class="jxr_linenumber" name="278" href="#278">278</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="279" href="#279">279</a> <em class="jxr_javadoccomment"> * Public getter for corpus.</em>
+<a class="jxr_linenumber" name="280" href="#280">280</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="281" href="#281">281</a> <strong class="jxr_keyword">public</strong> Map<String, Double> getCorpus() {
+<a class="jxr_linenumber" name="282" href="#282">282</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">this</strong>.corpus;
+<a class="jxr_linenumber" name="283" href="#283">283</a> }
+<a class="jxr_linenumber" name="284" href="#284">284</a>
+<a class="jxr_linenumber" name="285" href="#285">285</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="286" href="#286">286</a> <em class="jxr_javadoccomment"> * Builds the corpus from the existing ham & spam counts.</em>
+<a class="jxr_linenumber" name="287" href="#287">287</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="288" href="#288">288</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> buildCorpus() {
+<a class="jxr_linenumber" name="289" href="#289">289</a> <em class="jxr_comment">// Combine the known ham & spam tokens.</em>
+<a class="jxr_linenumber" name="290" href="#290">290</a> Set<String> set = <strong class="jxr_keyword">new</strong> HashSet<String>(hamTokenCounts.size() + spamTokenCounts.size());
+<a class="jxr_linenumber" name="291" href="#291">291</a> set.addAll(hamTokenCounts.keySet());
+<a class="jxr_linenumber" name="292" href="#292">292</a> set.addAll(spamTokenCounts.keySet());
+<a class="jxr_linenumber" name="293" href="#293">293</a> Map<String, Double> tempCorpus = <strong class="jxr_keyword">new</strong> HashMap<String, Double>(set.size());
+<a class="jxr_linenumber" name="294" href="#294">294</a>
+<a class="jxr_linenumber" name="295" href="#295">295</a> <em class="jxr_comment">// Iterate through all the tokens and compute their new</em>
+<a class="jxr_linenumber" name="296" href="#296">296</a> <em class="jxr_comment">// individual probabilities.</em>
+<a class="jxr_linenumber" name="297" href="#297">297</a> Iterator<String> i = set.iterator();
+<a class="jxr_linenumber" name="298" href="#298">298</a> <strong class="jxr_keyword">while</strong> (i.hasNext()) {
+<a class="jxr_linenumber" name="299" href="#299">299</a> String token = i.next();
+<a class="jxr_linenumber" name="300" href="#300">300</a> tempCorpus.put(token, <strong class="jxr_keyword">new</strong> Double(computeProbability(token)));
+<a class="jxr_linenumber" name="301" href="#301">301</a> }
+<a class="jxr_linenumber" name="302" href="#302">302</a> setCorpus(tempCorpus);
+<a class="jxr_linenumber" name="303" href="#303">303</a> }
+<a class="jxr_linenumber" name="304" href="#304">304</a>
+<a class="jxr_linenumber" name="305" href="#305">305</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="306" href="#306">306</a> <em class="jxr_javadoccomment"> * Adds a message to the ham list.</em>
+<a class="jxr_linenumber" name="307" href="#307">307</a> <em class="jxr_javadoccomment"> * </em>
+<a class="jxr_linenumber" name="308" href="#308">308</a> <em class="jxr_javadoccomment"> * @param stream</em>
+<a class="jxr_linenumber" name="309" href="#309">309</a> <em class="jxr_javadoccomment"> * A reader stream on the ham message to analyze</em>
+<a class="jxr_linenumber" name="310" href="#310">310</a> <em class="jxr_javadoccomment"> * @throws IOException</em>
+<a class="jxr_linenumber" name="311" href="#311">311</a> <em class="jxr_javadoccomment"> * If any error occurs</em>
+<a class="jxr_linenumber" name="312" href="#312">312</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="313" href="#313">313</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> addHam(Reader stream) <strong class="jxr_keyword">throws</strong> java.io.IOException {
+<a class="jxr_linenumber" name="314" href="#314">314</a> addTokenOccurrences(stream, hamTokenCounts);
+<a class="jxr_linenumber" name="315" href="#315">315</a> hamMessageCount++;
+<a class="jxr_linenumber" name="316" href="#316">316</a> }
+<a class="jxr_linenumber" name="317" href="#317">317</a>
+<a class="jxr_linenumber" name="318" href="#318">318</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="319" href="#319">319</a> <em class="jxr_javadoccomment"> * Adds a message to the spam list.</em>
+<a class="jxr_linenumber" name="320" href="#320">320</a> <em class="jxr_javadoccomment"> * </em>
+<a class="jxr_linenumber" name="321" href="#321">321</a> <em class="jxr_javadoccomment"> * @param stream</em>
+<a class="jxr_linenumber" name="322" href="#322">322</a> <em class="jxr_javadoccomment"> * A reader stream on the spam message to analyze</em>
+<a class="jxr_linenumber" name="323" href="#323">323</a> <em class="jxr_javadoccomment"> * @throws IOException</em>
+<a class="jxr_linenumber" name="324" href="#324">324</a> <em class="jxr_javadoccomment"> * If any error occurs</em>
+<a class="jxr_linenumber" name="325" href="#325">325</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="326" href="#326">326</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> addSpam(Reader stream) <strong class="jxr_keyword">throws</strong> java.io.IOException {
+<a class="jxr_linenumber" name="327" href="#327">327</a> addTokenOccurrences(stream, spamTokenCounts);
+<a class="jxr_linenumber" name="328" href="#328">328</a> spamMessageCount++;
+<a class="jxr_linenumber" name="329" href="#329">329</a> }
+<a class="jxr_linenumber" name="330" href="#330">330</a>
+<a class="jxr_linenumber" name="331" href="#331">331</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="332" href="#332">332</a> <em class="jxr_javadoccomment"> * Computes the probability that the stream contains SPAM.</em>
+<a class="jxr_linenumber" name="333" href="#333">333</a> <em class="jxr_javadoccomment"> * </em>
+<a class="jxr_linenumber" name="334" href="#334">334</a> <em class="jxr_javadoccomment"> * @param stream</em>
+<a class="jxr_linenumber" name="335" href="#335">335</a> <em class="jxr_javadoccomment"> * The text to be analyzed for Spamminess.</em>
+<a class="jxr_linenumber" name="336" href="#336">336</a> <em class="jxr_javadoccomment"> * @return A 0.0 - 1.0 probability</em>
+<a class="jxr_linenumber" name="337" href="#337">337</a> <em class="jxr_javadoccomment"> * @throws IOException</em>
+<a class="jxr_linenumber" name="338" href="#338">338</a> <em class="jxr_javadoccomment"> * If any error occurs</em>
+<a class="jxr_linenumber" name="339" href="#339">339</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="340" href="#340">340</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">double</strong> computeSpamProbability(Reader stream) <strong class="jxr_keyword">throws</strong> java.io.IOException {
+<a class="jxr_linenumber" name="341" href="#341">341</a> <em class="jxr_comment">// Build a set of the tokens in the Stream.</em>
+<a class="jxr_linenumber" name="342" href="#342">342</a> Set<String> tokens = parse(stream);
+<a class="jxr_linenumber" name="343" href="#343">343</a>
+<a class="jxr_linenumber" name="344" href="#344">344</a> <em class="jxr_comment">// Get the corpus to use in this run</em>
+<a class="jxr_linenumber" name="345" href="#345">345</a> <em class="jxr_comment">// A new corpus may be being built in the meantime</em>
+<a class="jxr_linenumber" name="346" href="#346">346</a> Map<String, Double> workCorpus = getCorpus();
+<a class="jxr_linenumber" name="347" href="#347">347</a>
+<a class="jxr_linenumber" name="348" href="#348">348</a> <em class="jxr_comment">// Assign their probabilities from the Corpus (using an additional</em>
+<a class="jxr_linenumber" name="349" href="#349">349</a> <em class="jxr_comment">// calculation to determine spamminess).</em>
+<a class="jxr_linenumber" name="350" href="#350">350</a> SortedSet<TokenProbabilityStrength> tokenProbabilityStrengths = getTokenProbabilityStrengths(tokens, workCorpus);
+<a class="jxr_linenumber" name="351" href="#351">351</a>
+<a class="jxr_linenumber" name="352" href="#352">352</a> <em class="jxr_comment">// Compute and return the overall probability that the</em>
+<a class="jxr_linenumber" name="353" href="#353">353</a> <em class="jxr_comment">// stream is SPAM.</em>
+<a class="jxr_linenumber" name="354" href="#354">354</a> <strong class="jxr_keyword">return</strong> computeOverallProbability(tokenProbabilityStrengths, workCorpus);
+<a class="jxr_linenumber" name="355" href="#355">355</a> }
+<a class="jxr_linenumber" name="356" href="#356">356</a>
+<a class="jxr_linenumber" name="357" href="#357">357</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="358" href="#358">358</a> <em class="jxr_javadoccomment"> * Parses a stream into tokens, and updates the target Map with the</em>
+<a class="jxr_linenumber" name="359" href="#359">359</a> <em class="jxr_javadoccomment"> * token/counts.</em>
+<a class="jxr_linenumber" name="360" href="#360">360</a> <em class="jxr_javadoccomment"> * </em>
+<a class="jxr_linenumber" name="361" href="#361">361</a> <em class="jxr_javadoccomment"> * @param stream</em>
+<a class="jxr_linenumber" name="362" href="#362">362</a> <em class="jxr_javadoccomment"> * @param target</em>
+<a class="jxr_linenumber" name="363" href="#363">363</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="364" href="#364">364</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">void</strong> addTokenOccurrences(Reader stream, Map<String, Integer> target) <strong class="jxr_keyword">throws</strong> java.io.IOException {
+<a class="jxr_linenumber" name="365" href="#365">365</a> String token;
+<a class="jxr_linenumber" name="366" href="#366">366</a> String header = <span class="jxr_string">""</span>;
+<a class="jxr_linenumber" name="367" href="#367">367</a>
+<a class="jxr_linenumber" name="368" href="#368">368</a> <em class="jxr_comment">// Update target with the tokens/count encountered.</em>
+<a class="jxr_linenumber" name="369" href="#369">369</a> <strong class="jxr_keyword">while</strong> ((token = nextToken(stream)) != <strong class="jxr_keyword">null</strong>) {
+<a class="jxr_linenumber" name="370" href="#370">370</a> <strong class="jxr_keyword">boolean</strong> endingLine = false;
+<a class="jxr_linenumber" name="371" href="#371">371</a> <strong class="jxr_keyword">if</strong> (token.length() > 0 && token.charAt(token.length() - 1) == '\n') {
+<a class="jxr_linenumber" name="372" href="#372">372</a> endingLine = <strong class="jxr_keyword">true</strong>;
+<a class="jxr_linenumber" name="373" href="#373">373</a> token = token.substring(0, token.length() - 1);
+<a class="jxr_linenumber" name="374" href="#374">374</a> }
+<a class="jxr_linenumber" name="375" href="#375">375</a>
+<a class="jxr_linenumber" name="376" href="#376">376</a> <strong class="jxr_keyword">if</strong> (token.length() > 0 && header.length() + token.length() < 90 && !allDigits(token)) {
+<a class="jxr_linenumber" name="377" href="#377">377</a> <strong class="jxr_keyword">if</strong> (token.equals(<span class="jxr_string">"From:"</span>) || token.equals(<span class="jxr_string">"Return-Path:"</span>) || token.equals(<span class="jxr_string">"Subject:"</span>) || token.equals(<span class="jxr_string">"To:"</span>)) {
+<a class="jxr_linenumber" name="378" href="#378">378</a> header = token;
+<a class="jxr_linenumber" name="379" href="#379">379</a> <strong class="jxr_keyword">if</strong> (!endingLine) {
+<a class="jxr_linenumber" name="380" href="#380">380</a> <strong class="jxr_keyword">continue</strong>;
+<a class="jxr_linenumber" name="381" href="#381">381</a> }
+<a class="jxr_linenumber" name="382" href="#382">382</a> }
+<a class="jxr_linenumber" name="383" href="#383">383</a>
+<a class="jxr_linenumber" name="384" href="#384">384</a> token = header + token;
+<a class="jxr_linenumber" name="385" href="#385">385</a>
+<a class="jxr_linenumber" name="386" href="#386">386</a> Integer value = <strong class="jxr_keyword">null</strong>;
+<a class="jxr_linenumber" name="387" href="#387">387</a>
+<a class="jxr_linenumber" name="388" href="#388">388</a> <strong class="jxr_keyword">if</strong> (target.containsKey(token)) {
+<a class="jxr_linenumber" name="389" href="#389">389</a> value = Integer.valueOf(((Integer) target.get(token)).intValue() + 1);
+<a class="jxr_linenumber" name="390" href="#390">390</a> } <strong class="jxr_keyword">else</strong> {
+<a class="jxr_linenumber" name="391" href="#391">391</a> value = Integer.valueOf(1);
+<a class="jxr_linenumber" name="392" href="#392">392</a> }
+<a class="jxr_linenumber" name="393" href="#393">393</a>
+<a class="jxr_linenumber" name="394" href="#394">394</a> target.put(token, value);
+<a class="jxr_linenumber" name="395" href="#395">395</a> }
+<a class="jxr_linenumber" name="396" href="#396">396</a>
+<a class="jxr_linenumber" name="397" href="#397">397</a> <strong class="jxr_keyword">if</strong> (endingLine) {
+<a class="jxr_linenumber" name="398" href="#398">398</a> header = <span class="jxr_string">""</span>;
+<a class="jxr_linenumber" name="399" href="#399">399</a> }
+<a class="jxr_linenumber" name="400" href="#400">400</a> }
+<a class="jxr_linenumber" name="401" href="#401">401</a> }
+<a class="jxr_linenumber" name="402" href="#402">402</a>
+<a class="jxr_linenumber" name="403" href="#403">403</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="404" href="#404">404</a> <em class="jxr_javadoccomment"> * Parses a stream into tokens, and returns a Set of the unique tokens</em>
+<a class="jxr_linenumber" name="405" href="#405">405</a> <em class="jxr_javadoccomment"> * encountered.</em>
+<a class="jxr_linenumber" name="406" href="#406">406</a> <em class="jxr_javadoccomment"> * </em>
+<a class="jxr_linenumber" name="407" href="#407">407</a> <em class="jxr_javadoccomment"> * @param stream</em>
+<a class="jxr_linenumber" name="408" href="#408">408</a> <em class="jxr_javadoccomment"> * @return Set</em>
+<a class="jxr_linenumber" name="409" href="#409">409</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="410" href="#410">410</a> <strong class="jxr_keyword">private</strong> Set<String> parse(Reader stream) <strong class="jxr_keyword">throws</strong> java.io.IOException {
+<a class="jxr_linenumber" name="411" href="#411">411</a> Set<String> tokens = <strong class="jxr_keyword">new</strong> HashSet<String>();
+<a class="jxr_linenumber" name="412" href="#412">412</a> String token;
+<a class="jxr_linenumber" name="413" href="#413">413</a> String header = <span class="jxr_string">""</span>;
+<a class="jxr_linenumber" name="414" href="#414">414</a>
+<a class="jxr_linenumber" name="415" href="#415">415</a> <em class="jxr_comment">// Build a Map of tokens encountered.</em>
+<a class="jxr_linenumber" name="416" href="#416">416</a> <strong class="jxr_keyword">while</strong> ((token = nextToken(stream)) != <strong class="jxr_keyword">null</strong>) {
+<a class="jxr_linenumber" name="417" href="#417">417</a> <strong class="jxr_keyword">boolean</strong> endingLine = false;
+<a class="jxr_linenumber" name="418" href="#418">418</a> <strong class="jxr_keyword">if</strong> (token.length() > 0 && token.charAt(token.length() - 1) == '\n') {
+<a class="jxr_linenumber" name="419" href="#419">419</a> endingLine = <strong class="jxr_keyword">true</strong>;
+<a class="jxr_linenumber" name="420" href="#420">420</a> token = token.substring(0, token.length() - 1);
+<a class="jxr_linenumber" name="421" href="#421">421</a> }
+<a class="jxr_linenumber" name="422" href="#422">422</a>
+<a class="jxr_linenumber" name="423" href="#423">423</a> <strong class="jxr_keyword">if</strong> (token.length() > 0 && header.length() + token.length() < 90 && !allDigits(token)) {
+<a class="jxr_linenumber" name="424" href="#424">424</a> <strong class="jxr_keyword">if</strong> (token.equals(<span class="jxr_string">"From:"</span>) || token.equals(<span class="jxr_string">"Return-Path:"</span>) || token.equals(<span class="jxr_string">"Subject:"</span>) || token.equals(<span class="jxr_string">"To:"</span>)) {
+<a class="jxr_linenumber" name="425" href="#425">425</a> header = token;
+<a class="jxr_linenumber" name="426" href="#426">426</a> <strong class="jxr_keyword">if</strong> (!endingLine) {
+<a class="jxr_linenumber" name="427" href="#427">427</a> <strong class="jxr_keyword">continue</strong>;
+<a class="jxr_linenumber" name="428" href="#428">428</a> }
+<a class="jxr_linenumber" name="429" href="#429">429</a> }
+<a class="jxr_linenumber" name="430" href="#430">430</a>
+<a class="jxr_linenumber" name="431" href="#431">431</a> token = header + token;
+<a class="jxr_linenumber" name="432" href="#432">432</a>
+<a class="jxr_linenumber" name="433" href="#433">433</a> tokens.add(token);
+<a class="jxr_linenumber" name="434" href="#434">434</a> }
+<a class="jxr_linenumber" name="435" href="#435">435</a>
+<a class="jxr_linenumber" name="436" href="#436">436</a> <strong class="jxr_keyword">if</strong> (endingLine) {
+<a class="jxr_linenumber" name="437" href="#437">437</a> header = <span class="jxr_string">""</span>;
+<a class="jxr_linenumber" name="438" href="#438">438</a> }
+<a class="jxr_linenumber" name="439" href="#439">439</a> }
+<a class="jxr_linenumber" name="440" href="#440">440</a>
+<a class="jxr_linenumber" name="441" href="#441">441</a> <em class="jxr_comment">// Return the unique set of tokens encountered.</em>
+<a class="jxr_linenumber" name="442" href="#442">442</a> <strong class="jxr_keyword">return</strong> tokens;
+<a class="jxr_linenumber" name="443" href="#443">443</a> }
+<a class="jxr_linenumber" name="444" href="#444">444</a>
+<a class="jxr_linenumber" name="445" href="#445">445</a> <strong class="jxr_keyword">private</strong> String nextToken(Reader reader) <strong class="jxr_keyword">throws</strong> java.io.IOException {
+<a class="jxr_linenumber" name="446" href="#446">446</a> StringBuffer token = <strong class="jxr_keyword">new</strong> StringBuffer();
+<a class="jxr_linenumber" name="447" href="#447">447</a> <strong class="jxr_keyword">int</strong> i;
+<a class="jxr_linenumber" name="448" href="#448">448</a> <strong class="jxr_keyword">char</strong> ch, ch2;
+<a class="jxr_linenumber" name="449" href="#449">449</a> <strong class="jxr_keyword">boolean</strong> previousWasDigit = false;
+<a class="jxr_linenumber" name="450" href="#450">450</a> <strong class="jxr_keyword">boolean</strong> tokenCharFound = false;
+<a class="jxr_linenumber" name="451" href="#451">451</a>
+<a class="jxr_linenumber" name="452" href="#452">452</a> <strong class="jxr_keyword">if</strong> (!reader.ready()) {
+<a class="jxr_linenumber" name="453" href="#453">453</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">null</strong>;
+<a class="jxr_linenumber" name="454" href="#454">454</a> }
+<a class="jxr_linenumber" name="455" href="#455">455</a>
+<a class="jxr_linenumber" name="456" href="#456">456</a> <strong class="jxr_keyword">while</strong> ((i = reader.read()) != -1) {
+<a class="jxr_linenumber" name="457" href="#457">457</a>
+<a class="jxr_linenumber" name="458" href="#458">458</a> ch = (<strong class="jxr_keyword">char</strong>) i;
+<a class="jxr_linenumber" name="459" href="#459">459</a>
+<a class="jxr_linenumber" name="460" href="#460">460</a> <strong class="jxr_keyword">if</strong> (ch == ':') {
+<a class="jxr_linenumber" name="461" href="#461">461</a> String tokenString = token.toString() + ':';
+<a class="jxr_linenumber" name="462" href="#462">462</a> <strong class="jxr_keyword">if</strong> (tokenString.equals(<span class="jxr_string">"From:"</span>) || tokenString.equals(<span class="jxr_string">"Return-Path:"</span>) || tokenString.equals(<span class="jxr_string">"Subject:"</span>) || tokenString.equals(<span class="jxr_string">"To:"</span>)) {
+<a class="jxr_linenumber" name="463" href="#463">463</a> <strong class="jxr_keyword">return</strong> tokenString;
+<a class="jxr_linenumber" name="464" href="#464">464</a> }
+<a class="jxr_linenumber" name="465" href="#465">465</a> }
+<a class="jxr_linenumber" name="466" href="#466">466</a>
+<a class="jxr_linenumber" name="467" href="#467">467</a> <strong class="jxr_keyword">if</strong> (Character.isLetter(ch) || ch == '-' || ch == '$' || ch == '\u20AC' <em class="jxr_comment">// the</em>
+<a class="jxr_linenumber" name="468" href="#468">468</a> <em class="jxr_comment">// EURO</em>
+<a class="jxr_linenumber" name="469" href="#469">469</a> <em class="jxr_comment">// symbol</em>
+<a class="jxr_linenumber" name="470" href="#470">470</a> || ch == '!' || ch == '\'') {
+<a class="jxr_linenumber" name="471" href="#471">471</a> tokenCharFound = <strong class="jxr_keyword">true</strong>;
+<a class="jxr_linenumber" name="472" href="#472">472</a> previousWasDigit = false;
+<a class="jxr_linenumber" name="473" href="#473">473</a> token.append(ch);
+<a class="jxr_linenumber" name="474" href="#474">474</a> } <strong class="jxr_keyword">else</strong> <strong class="jxr_keyword">if</strong> (Character.isDigit(ch)) {
+<a class="jxr_linenumber" name="475" href="#475">475</a> tokenCharFound = <strong class="jxr_keyword">true</strong>;
+<a class="jxr_linenumber" name="476" href="#476">476</a> previousWasDigit = <strong class="jxr_keyword">true</strong>;
+<a class="jxr_linenumber" name="477" href="#477">477</a> token.append(ch);
+<a class="jxr_linenumber" name="478" href="#478">478</a> } <strong class="jxr_keyword">else</strong> <strong class="jxr_keyword">if</strong> (previousWasDigit && (ch == '.' || ch == ',')) {
+<a class="jxr_linenumber" name="479" href="#479">479</a> reader.mark(1);
+<a class="jxr_linenumber" name="480" href="#480">480</a> previousWasDigit = false;
+<a class="jxr_linenumber" name="481" href="#481">481</a> i = reader.read();
+<a class="jxr_linenumber" name="482" href="#482">482</a> <strong class="jxr_keyword">if</strong> (i == -1) {
+<a class="jxr_linenumber" name="483" href="#483">483</a> <strong class="jxr_keyword">break</strong>;
+<a class="jxr_linenumber" name="484" href="#484">484</a> }
+<a class="jxr_linenumber" name="485" href="#485">485</a> ch2 = (<strong class="jxr_keyword">char</strong>) i;
+<a class="jxr_linenumber" name="486" href="#486">486</a> <strong class="jxr_keyword">if</strong> (Character.isDigit(ch2)) {
+<a class="jxr_linenumber" name="487" href="#487">487</a> tokenCharFound = <strong class="jxr_keyword">true</strong>;
+<a class="jxr_linenumber" name="488" href="#488">488</a> previousWasDigit = <strong class="jxr_keyword">true</strong>;
+<a class="jxr_linenumber" name="489" href="#489">489</a> token.append(ch);
+<a class="jxr_linenumber" name="490" href="#490">490</a> token.append(ch2);
+<a class="jxr_linenumber" name="491" href="#491">491</a> } <strong class="jxr_keyword">else</strong> {
+<a class="jxr_linenumber" name="492" href="#492">492</a> reader.reset();
+<a class="jxr_linenumber" name="493" href="#493">493</a> <strong class="jxr_keyword">break</strong>;
+<a class="jxr_linenumber" name="494" href="#494">494</a> }
+<a class="jxr_linenumber" name="495" href="#495">495</a> } <strong class="jxr_keyword">else</strong> <strong class="jxr_keyword">if</strong> (ch == '\r') {
+<a class="jxr_linenumber" name="496" href="#496">496</a> <em class="jxr_comment">// cr found, ignore</em>
+<a class="jxr_linenumber" name="497" href="#497">497</a> } <strong class="jxr_keyword">else</strong> <strong class="jxr_keyword">if</strong> (ch == '\n') {
+<a class="jxr_linenumber" name="498" href="#498">498</a> <em class="jxr_comment">// eol found</em>
+<a class="jxr_linenumber" name="499" href="#499">499</a> tokenCharFound = <strong class="jxr_keyword">true</strong>;
+<a class="jxr_linenumber" name="500" href="#500">500</a> previousWasDigit = false;
+<a class="jxr_linenumber" name="501" href="#501">501</a> token.append(ch);
+<a class="jxr_linenumber" name="502" href="#502">502</a> <strong class="jxr_keyword">break</strong>;
+<a class="jxr_linenumber" name="503" href="#503">503</a> } <strong class="jxr_keyword">else</strong> <strong class="jxr_keyword">if</strong> (tokenCharFound) {
+<a class="jxr_linenumber" name="504" href="#504">504</a> <strong class="jxr_keyword">break</strong>;
+<a class="jxr_linenumber" name="505" href="#505">505</a> }
+<a class="jxr_linenumber" name="506" href="#506">506</a> }
+<a class="jxr_linenumber" name="507" href="#507">507</a>
+<a class="jxr_linenumber" name="508" href="#508">508</a> <strong class="jxr_keyword">if</strong> (tokenCharFound) {
+<a class="jxr_linenumber" name="509" href="#509">509</a> <em class="jxr_comment">// System.out.println("Token read: " + token);</em>
+<a class="jxr_linenumber" name="510" href="#510">510</a> <strong class="jxr_keyword">return</strong> token.toString();
+<a class="jxr_linenumber" name="511" href="#511">511</a> } <strong class="jxr_keyword">else</strong> {
+<a class="jxr_linenumber" name="512" href="#512">512</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">null</strong>;
+<a class="jxr_linenumber" name="513" href="#513">513</a> }
+<a class="jxr_linenumber" name="514" href="#514">514</a> }
+<a class="jxr_linenumber" name="515" href="#515">515</a>
+<a class="jxr_linenumber" name="516" href="#516">516</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="517" href="#517">517</a> <em class="jxr_javadoccomment"> * Compute the probability that "token" is SPAM.</em>
+<a class="jxr_linenumber" name="518" href="#518">518</a> <em class="jxr_javadoccomment"> * </em>
+<a class="jxr_linenumber" name="519" href="#519">519</a> <em class="jxr_javadoccomment"> * @param token</em>
+<a class="jxr_linenumber" name="520" href="#520">520</a> <em class="jxr_javadoccomment"> * @return The probability that the token occurs within spam.</em>
+<a class="jxr_linenumber" name="521" href="#521">521</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="522" href="#522">522</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">double</strong> computeProbability(String token) {
+<a class="jxr_linenumber" name="523" href="#523">523</a> <strong class="jxr_keyword">double</strong> hamFactor = 0;
+<a class="jxr_linenumber" name="524" href="#524">524</a> <strong class="jxr_keyword">double</strong> spamFactor = 0;
+<a class="jxr_linenumber" name="525" href="#525">525</a>
+<a class="jxr_linenumber" name="526" href="#526">526</a> <strong class="jxr_keyword">boolean</strong> foundInHam = false;
+<a class="jxr_linenumber" name="527" href="#527">527</a> <strong class="jxr_keyword">boolean</strong> foundInSpam = false;
+<a class="jxr_linenumber" name="528" href="#528">528</a>
+<a class="jxr_linenumber" name="529" href="#529">529</a> <strong class="jxr_keyword">double</strong> minThreshold = 0.01;
+<a class="jxr_linenumber" name="530" href="#530">530</a> <strong class="jxr_keyword">double</strong> maxThreshold = 0.99;
+<a class="jxr_linenumber" name="531" href="#531">531</a>
+<a class="jxr_linenumber" name="532" href="#532">532</a> <strong class="jxr_keyword">if</strong> (hamTokenCounts.containsKey(token)) {
+<a class="jxr_linenumber" name="533" href="#533">533</a> foundInHam = <strong class="jxr_keyword">true</strong>;
+<a class="jxr_linenumber" name="534" href="#534">534</a> }
+<a class="jxr_linenumber" name="535" href="#535">535</a>
+<a class="jxr_linenumber" name="536" href="#536">536</a> <strong class="jxr_keyword">if</strong> (spamTokenCounts.containsKey(token)) {
+<a class="jxr_linenumber" name="537" href="#537">537</a> foundInSpam = <strong class="jxr_keyword">true</strong>;
+<a class="jxr_linenumber" name="538" href="#538">538</a> }
+<a class="jxr_linenumber" name="539" href="#539">539</a>
+<a class="jxr_linenumber" name="540" href="#540">540</a> <strong class="jxr_keyword">if</strong> (foundInHam) {
+<a class="jxr_linenumber" name="541" href="#541">541</a> hamFactor = 2 * ((Integer) hamTokenCounts.get(token)).doubleValue();
+<a class="jxr_linenumber" name="542" href="#542">542</a> <strong class="jxr_keyword">if</strong> (!foundInSpam) {
+<a class="jxr_linenumber" name="543" href="#543">543</a> minThreshold = (hamFactor > 20) ? 0.0001 : 0.0002;
+<a class="jxr_linenumber" name="544" href="#544">544</a> }
+<a class="jxr_linenumber" name="545" href="#545">545</a> }
+<a class="jxr_linenumber" name="546" href="#546">546</a>
+<a class="jxr_linenumber" name="547" href="#547">547</a> <strong class="jxr_keyword">if</strong> (foundInSpam) {
+<a class="jxr_linenumber" name="548" href="#548">548</a> spamFactor = ((Integer) spamTokenCounts.get(token)).doubleValue();
+<a class="jxr_linenumber" name="549" href="#549">549</a> <strong class="jxr_keyword">if</strong> (!foundInHam) {
+<a class="jxr_linenumber" name="550" href="#550">550</a> maxThreshold = (spamFactor > 10) ? 0.9999 : 0.9998;
+<a class="jxr_linenumber" name="551" href="#551">551</a> }
+<a class="jxr_linenumber" name="552" href="#552">552</a> }
+<a class="jxr_linenumber" name="553" href="#553">553</a>
+<a class="jxr_linenumber" name="554" href="#554">554</a> <strong class="jxr_keyword">if</strong> ((hamFactor + spamFactor) < 5) {
+<a class="jxr_linenumber" name="555" href="#555">555</a> <em class="jxr_comment">// This token hasn't been seen enough.</em>
+<a class="jxr_linenumber" name="556" href="#556">556</a> <strong class="jxr_keyword">return</strong> 0.4;
+<a class="jxr_linenumber" name="557" href="#557">557</a> }
+<a class="jxr_linenumber" name="558" href="#558">558</a>
+<a class="jxr_linenumber" name="559" href="#559">559</a> <strong class="jxr_keyword">double</strong> spamFreq = Math.min(1.0, spamFactor / spamMessageCount);
+<a class="jxr_linenumber" name="560" href="#560">560</a> <strong class="jxr_keyword">double</strong> hamFreq = Math.min(1.0, hamFactor / hamMessageCount);
+<a class="jxr_linenumber" name="561" href="#561">561</a>
+<a class="jxr_linenumber" name="562" href="#562">562</a> <strong class="jxr_keyword">return</strong> Math.max(minThreshold, Math.min(maxThreshold, (spamFreq / (hamFreq + spamFreq))));
+<a class="jxr_linenumber" name="563" href="#563">563</a> }
+<a class="jxr_linenumber" name="564" href="#564">564</a>
+<a class="jxr_linenumber" name="565" href="#565">565</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="566" href="#566">566</a> <em class="jxr_javadoccomment"> * Returns a SortedSet of TokenProbabilityStrength built from the Corpus and</em>
+<a class="jxr_linenumber" name="567" href="#567">567</a> <em class="jxr_javadoccomment"> * the tokens passed in the "tokens" Set. The ordering is from the highest</em>
+<a class="jxr_linenumber" name="568" href="#568">568</a> <em class="jxr_javadoccomment"> * strength to the lowest strength.</em>
+<a class="jxr_linenumber" name="569" href="#569">569</a> <em class="jxr_javadoccomment"> * </em>
+<a class="jxr_linenumber" name="570" href="#570">570</a> <em class="jxr_javadoccomment"> * @param tokens</em>
+<a class="jxr_linenumber" name="571" href="#571">571</a> <em class="jxr_javadoccomment"> * @param workCorpus</em>
+<a class="jxr_linenumber" name="572" href="#572">572</a> <em class="jxr_javadoccomment"> * @return SortedSet of TokenProbabilityStrength objects.</em>
+<a class="jxr_linenumber" name="573" href="#573">573</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="574" href="#574">574</a> <strong class="jxr_keyword">private</strong> SortedSet<TokenProbabilityStrength> getTokenProbabilityStrengths(Set<String> tokens, Map<String, Double> workCorpus) {
+<a class="jxr_linenumber" name="575" href="#575">575</a> <em class="jxr_comment">// Convert to a SortedSet of token probability strengths.</em>
+<a class="jxr_linenumber" name="576" href="#576">576</a> SortedSet<TokenProbabilityStrength> tokenProbabilityStrengths = <strong class="jxr_keyword">new</strong> TreeSet<TokenProbabilityStrength>();
+<a class="jxr_linenumber" name="577" href="#577">577</a>
+<a class="jxr_linenumber" name="578" href="#578">578</a> Iterator<String> i = tokens.iterator();
+<a class="jxr_linenumber" name="579" href="#579">579</a> <strong class="jxr_keyword">while</strong> (i.hasNext()) {
+<a class="jxr_linenumber" name="580" href="#580">580</a> <a href="../../../../../org/apache/james/ai/classic/BayesianAnalyzer.html">TokenProbabilityStrength</a> tps = <strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/james/ai/classic/BayesianAnalyzer.html">TokenProbabilityStrength</a>();
+<a class="jxr_linenumber" name="581" href="#581">581</a>
+<a class="jxr_linenumber" name="582" href="#582">582</a> tps.token = (String) i.next();
+<a class="jxr_linenumber" name="583" href="#583">583</a>
+<a class="jxr_linenumber" name="584" href="#584">584</a> <strong class="jxr_keyword">if</strong> (workCorpus.containsKey(tps.token)) {
+<a class="jxr_linenumber" name="585" href="#585">585</a> tps.strength = Math.abs(0.5 - ((Double) workCorpus.get(tps.token)).doubleValue());
+<a class="jxr_linenumber" name="586" href="#586">586</a> } <strong class="jxr_keyword">else</strong> {
+<a class="jxr_linenumber" name="587" href="#587">587</a> <em class="jxr_comment">// This token has never been seen before,</em>
+<a class="jxr_linenumber" name="588" href="#588">588</a> <em class="jxr_comment">// we'll give it initially the default probability.</em>
+<a class="jxr_linenumber" name="589" href="#589">589</a> Double corpusProbability = <strong class="jxr_keyword">new</strong> Double(DEFAULT_TOKEN_PROBABILITY);
+<a class="jxr_linenumber" name="590" href="#590">590</a> tps.strength = Math.abs(0.5 - DEFAULT_TOKEN_PROBABILITY);
+<a class="jxr_linenumber" name="591" href="#591">591</a> <strong class="jxr_keyword">boolean</strong> isTokenDegeneratedFound = false;
+<a class="jxr_linenumber" name="592" href="#592">592</a>
+<a class="jxr_linenumber" name="593" href="#593">593</a> Collection<String> degeneratedTokens = buildDegenerated(tps.token);
+<a class="jxr_linenumber" name="594" href="#594">594</a> Iterator<String> iDegenerated = degeneratedTokens.iterator();
+<a class="jxr_linenumber" name="595" href="#595">595</a> String tokenDegenerated = <strong class="jxr_keyword">null</strong>;
+<a class="jxr_linenumber" name="596" href="#596">596</a> <strong class="jxr_keyword">double</strong> strengthDegenerated;
+<a class="jxr_linenumber" name="597" href="#597">597</a> <strong class="jxr_keyword">while</strong> (iDegenerated.hasNext()) {
+<a class="jxr_linenumber" name="598" href="#598">598</a> tokenDegenerated = (String) iDegenerated.next();
+<a class="jxr_linenumber" name="599" href="#599">599</a> <strong class="jxr_keyword">if</strong> (workCorpus.containsKey(tokenDegenerated)) {
+<a class="jxr_linenumber" name="600" href="#600">600</a> Double probabilityTemp = (Double) workCorpus.get(tokenDegenerated);
+<a class="jxr_linenumber" name="601" href="#601">601</a> strengthDegenerated = Math.abs(0.5 - probabilityTemp.doubleValue());
+<a class="jxr_linenumber" name="602" href="#602">602</a> <strong class="jxr_keyword">if</strong> (strengthDegenerated > tps.strength) {
+<a class="jxr_linenumber" name="603" href="#603">603</a> isTokenDegeneratedFound = <strong class="jxr_keyword">true</strong>;
+<a class="jxr_linenumber" name="604" href="#604">604</a> tps.strength = strengthDegenerated;
+<a class="jxr_linenumber" name="605" href="#605">605</a> corpusProbability = probabilityTemp;
+<a class="jxr_linenumber" name="606" href="#606">606</a> }
+<a class="jxr_linenumber" name="607" href="#607">607</a> }
+<a class="jxr_linenumber" name="608" href="#608">608</a> }
+<a class="jxr_linenumber" name="609" href="#609">609</a> <em class="jxr_comment">// to reduce memory usage, put in the corpus only if the</em>
+<a class="jxr_linenumber" name="610" href="#610">610</a> <em class="jxr_comment">// probability is different from (stronger than) the default</em>
+<a class="jxr_linenumber" name="611" href="#611">611</a> <strong class="jxr_keyword">if</strong> (isTokenDegeneratedFound) {
+<a class="jxr_linenumber" name="612" href="#612">612</a> <strong class="jxr_keyword">synchronized</strong> (workCorpus) {
+<a class="jxr_linenumber" name="613" href="#613">613</a> workCorpus.put(tps.token, corpusProbability);
+<a class="jxr_linenumber" name="614" href="#614">614</a> }
+<a class="jxr_linenumber" name="615" href="#615">615</a> }
+<a class="jxr_linenumber" name="616" href="#616">616</a> }
+<a class="jxr_linenumber" name="617" href="#617">617</a>
+<a class="jxr_linenumber" name="618" href="#618">618</a> tokenProbabilityStrengths.add(tps);
+<a class="jxr_linenumber" name="619" href="#619">619</a> }
+<a class="jxr_linenumber" name="620" href="#620">620</a>
+<a class="jxr_linenumber" name="621" href="#621">621</a> <strong class="jxr_keyword">return</strong> tokenProbabilityStrengths;
+<a class="jxr_linenumber" name="622" href="#622">622</a> }
+<a class="jxr_linenumber" name="623" href="#623">623</a>
+<a class="jxr_linenumber" name="624" href="#624">624</a> <strong class="jxr_keyword">private</strong> Collection<String> buildDegenerated(String fullToken) {
+<a class="jxr_linenumber" name="625" href="#625">625</a> ArrayList<String> tokens = <strong class="jxr_keyword">new</strong> ArrayList<String>();
+<a class="jxr_linenumber" name="626" href="#626">626</a> String header;
+<a class="jxr_linenumber" name="627" href="#627">627</a> String token;
+<a class="jxr_linenumber" name="628" href="#628">628</a> String tokenLower;
+<a class="jxr_linenumber" name="629" href="#629">629</a>
+<a class="jxr_linenumber" name="630" href="#630">630</a> <em class="jxr_comment">// look for a header string termination</em>
+<a class="jxr_linenumber" name="631" href="#631">631</a> <strong class="jxr_keyword">int</strong> headerEnd = fullToken.indexOf(':');
+<a class="jxr_linenumber" name="632" href="#632">632</a> <strong class="jxr_keyword">if</strong> (headerEnd >= 0) {
+<a class="jxr_linenumber" name="633" href="#633">633</a> header = fullToken.substring(0, headerEnd);
+<a class="jxr_linenumber" name="634" href="#634">634</a> token = fullToken.substring(headerEnd);
+<a class="jxr_linenumber" name="635" href="#635">635</a> } <strong class="jxr_keyword">else</strong> {
+<a class="jxr_linenumber" name="636" href="#636">636</a> header = <span class="jxr_string">""</span>;
+<a class="jxr_linenumber" name="637" href="#637">637</a> token = fullToken;
+<a class="jxr_linenumber" name="638" href="#638">638</a> }
+<a class="jxr_linenumber" name="639" href="#639">639</a>
+<a class="jxr_linenumber" name="640" href="#640">640</a> <em class="jxr_comment">// prepare a version of the token containing all lower case (for</em>
+<a class="jxr_linenumber" name="641" href="#641">641</a> <em class="jxr_comment">// performance reasons)</em>
+<a class="jxr_linenumber" name="642" href="#642">642</a> tokenLower = token.toLowerCase();
+<a class="jxr_linenumber" name="643" href="#643">643</a>
+<a class="jxr_linenumber" name="644" href="#644">644</a> <strong class="jxr_keyword">int</strong> end = token.length();
+<a class="jxr_linenumber" name="645" href="#645">645</a> <strong class="jxr_keyword">do</strong> {
+<a class="jxr_linenumber" name="646" href="#646">646</a> <strong class="jxr_keyword">if</strong> (!token.substring(0, end).equals(tokenLower.substring(0, end))) {
+<a class="jxr_linenumber" name="647" href="#647">647</a> tokens.add(header + tokenLower.substring(0, end));
+<a class="jxr_linenumber" name="648" href="#648">648</a> <strong class="jxr_keyword">if</strong> (header.length() > 0) {
+<a class="jxr_linenumber" name="649" href="#649">649</a> tokens.add(tokenLower.substring(0, end));
+<a class="jxr_linenumber" name="650" href="#650">650</a> }
+<a class="jxr_linenumber" name="651" href="#651">651</a> }
+<a class="jxr_linenumber" name="652" href="#652">652</a> <strong class="jxr_keyword">if</strong> (end > 1 && token.charAt(0) >= 'A' && token.charAt(0) <= 'Z') {
+<a class="jxr_linenumber" name="653" href="#653">653</a> tokens.add(header + token.charAt(0) + tokenLower.substring(1, end));
+<a class="jxr_linenumber" name="654" href="#654">654</a> <strong class="jxr_keyword">if</strong> (header.length() > 0) {
+<a class="jxr_linenumber" name="655" href="#655">655</a> tokens.add(token.charAt(0) + tokenLower.substring(1, end));
+<a class="jxr_linenumber" name="656" href="#656">656</a> }
+<a class="jxr_linenumber" name="657" href="#657">657</a> }
+<a class="jxr_linenumber" name="658" href="#658">658</a>
+<a class="jxr_linenumber" name="659" href="#659">659</a> <strong class="jxr_keyword">if</strong> (token.charAt(end - 1) != '!') {
+<a class="jxr_linenumber" name="660" href="#660">660</a> <strong class="jxr_keyword">break</strong>;
+<a class="jxr_linenumber" name="661" href="#661">661</a> }
+<a class="jxr_linenumber" name="662" href="#662">662</a>
+<a class="jxr_linenumber" name="663" href="#663">663</a> end--;
+<a class="jxr_linenumber" name="664" href="#664">664</a>
+<a class="jxr_linenumber" name="665" href="#665">665</a> tokens.add(header + token.substring(0, end));
+<a class="jxr_linenumber" name="666" href="#666">666</a> <strong class="jxr_keyword">if</strong> (header.length() > 0) {
+<a class="jxr_linenumber" name="667" href="#667">667</a> tokens.add(token.substring(0, end));
+<a class="jxr_linenumber" name="668" href="#668">668</a> }
+<a class="jxr_linenumber" name="669" href="#669">669</a> } <strong class="jxr_keyword">while</strong> (end > 0);
+<a class="jxr_linenumber" name="670" href="#670">670</a>
+<a class="jxr_linenumber" name="671" href="#671">671</a> <strong class="jxr_keyword">return</strong> tokens;
+<a class="jxr_linenumber" name="672" href="#672">672</a> }
+<a class="jxr_linenumber" name="673" href="#673">673</a>
+<a class="jxr_linenumber" name="674" href="#674">674</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="675" href="#675">675</a> <em class="jxr_javadoccomment"> * Compute the spamminess probability of the interesting tokens in the</em>
+<a class="jxr_linenumber" name="676" href="#676">676</a> <em class="jxr_javadoccomment"> * tokenProbabilities SortedSet.</em>
+<a class="jxr_linenumber" name="677" href="#677">677</a> <em class="jxr_javadoccomment"> * </em>
+<a class="jxr_linenumber" name="678" href="#678">678</a> <em class="jxr_javadoccomment"> * @param tokenProbabilityStrengths</em>
+<a class="jxr_linenumber" name="679" href="#679">679</a> <em class="jxr_javadoccomment"> * @param workCorpus</em>
+<a class="jxr_linenumber" name="680" href="#680">680</a> <em class="jxr_javadoccomment"> * @return Computed spamminess.</em>
+<a class="jxr_linenumber" name="681" href="#681">681</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="682" href="#682">682</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">double</strong> computeOverallProbability(SortedSet<TokenProbabilityStrength> tokenProbabilityStrengths, Map<String, Double> workCorpus) {
+<a class="jxr_linenumber" name="683" href="#683">683</a> <strong class="jxr_keyword">double</strong> p = 1.0;
+<a class="jxr_linenumber" name="684" href="#684">684</a> <strong class="jxr_keyword">double</strong> np = 1.0;
+<a class="jxr_linenumber" name="685" href="#685">685</a> <strong class="jxr_keyword">double</strong> tempStrength = 0.5;
+<a class="jxr_linenumber" name="686" href="#686">686</a> <strong class="jxr_keyword">int</strong> count = MAX_INTERESTING_TOKENS;
+<a class="jxr_linenumber" name="687" href="#687">687</a> Iterator<TokenProbabilityStrength> iterator = tokenProbabilityStrengths.iterator();
+<a class="jxr_linenumber" name="688" href="#688">688</a> <strong class="jxr_keyword">while</strong> ((iterator.hasNext()) && (count-- > 0 || tempStrength >= INTERESTINGNESS_THRESHOLD)) {
+<a class="jxr_linenumber" name="689" href="#689">689</a> <a href="../../../../../org/apache/james/ai/classic/BayesianAnalyzer.html">TokenProbabilityStrength</a> tps = iterator.next();
+<a class="jxr_linenumber" name="690" href="#690">690</a> tempStrength = tps.strength;
+<a class="jxr_linenumber" name="691" href="#691">691</a>
+<a class="jxr_linenumber" name="692" href="#692">692</a> <em class="jxr_comment">// System.out.println(tps);</em>
+<a class="jxr_linenumber" name="693" href="#693">693</a>
+<a class="jxr_linenumber" name="694" href="#694">694</a> <strong class="jxr_keyword">double</strong> theDoubleValue = DEFAULT_TOKEN_PROBABILITY; <em class="jxr_comment">// initialize it</em>
+<a class="jxr_linenumber" name="695" href="#695">695</a> <em class="jxr_comment">// to the default</em>
+<a class="jxr_linenumber" name="696" href="#696">696</a> Double theDoubleObject = (Double) workCorpus.get(tps.token);
+<a class="jxr_linenumber" name="697" href="#697">697</a> <em class="jxr_comment">// if either the original token or a degeneration was found use the</em>
+<a class="jxr_linenumber" name="698" href="#698">698</a> <em class="jxr_comment">// double value, otherwise use the default</em>
+<a class="jxr_linenumber" name="699" href="#699">699</a> <strong class="jxr_keyword">if</strong> (theDoubleObject != <strong class="jxr_keyword">null</strong>) {
+<a class="jxr_linenumber" name="700" href="#700">700</a> theDoubleValue = theDoubleObject.doubleValue();
+<a class="jxr_linenumber" name="701" href="#701">701</a> }
+<a class="jxr_linenumber" name="702" href="#702">702</a> p *= theDoubleValue;
+<a class="jxr_linenumber" name="703" href="#703">703</a> np *= (1.0 - theDoubleValue);
+<a class="jxr_linenumber" name="704" href="#704">704</a> <em class="jxr_comment">// System.out.println("Token " + tps + ", p=" + theDoubleValue +</em>
+<a class="jxr_linenumber" name="705" href="#705">705</a> <em class="jxr_comment">// ", overall p=" + p / (p + np));</em>
+<a class="jxr_linenumber" name="706" href="#706">706</a> }
+<a class="jxr_linenumber" name="707" href="#707">707</a>
+<a class="jxr_linenumber" name="708" href="#708">708</a> <strong class="jxr_keyword">return</strong> (p / (p + np));
+<a class="jxr_linenumber" name="709" href="#709">709</a> }
+<a class="jxr_linenumber" name="710" href="#710">710</a>
+<a class="jxr_linenumber" name="711" href="#711">711</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">boolean</strong> allDigits(String s) {
+<a class="jxr_linenumber" name="712" href="#712">712</a> <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i = 0; i < s.length(); i++) {
+<a class="jxr_linenumber" name="713" href="#713">713</a> <strong class="jxr_keyword">if</strong> (!Character.isDigit(s.charAt(i))) {
+<a class="jxr_linenumber" name="714" href="#714">714</a> <strong class="jxr_keyword">return</strong> false;
+<a class="jxr_linenumber" name="715" href="#715">715</a> }
+<a class="jxr_linenumber" name="716" href="#716">716</a> }
+<a class="jxr_linenumber" name="717" href="#717">717</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">true</strong>;
+<a class="jxr_linenumber" name="718" href="#718">718</a> }
+<a class="jxr_linenumber" name="719" href="#719">719</a> }
+</pre>
+<hr/><div id="footer">This page was automatically generated by <a href="http://maven.apache.org/">Maven</a></div></body>
+</html>
+
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