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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>IoSessionFinder xref</title><link type="text/css" rel="stylesheet" href="../../../../../stylesheet.css" /></head><body><div id="overview"><a href="../../../../../../apidocs/org/apache/mina/integration/ognl/IoSessionFinder.html">View Javadoc</a></div><pre><a name="1" href="#1">1</a> <em class="jxr_comment">/*</em><a name="2" href="#2">2</a> <em class="jxr_comment"> * Licensed to the Apache Software Foundation (ASF) under one or more</em><a name="3" href="#3">3</a> <em class="jxr_comment"> * contributor license agreements. See the NOTICE file distributed with</em><a name="4" href="#4">4</a> <em class="jxr_comment"> * this work for additional information regarding copyright ownership.</em><a name="5" href="#5">5</a> <em class="jxr_comment"> * The ASF licenses this file to You under the Apache License, Version 2.0</em><a name="6" href="#6">6</a> <em class="jxr_comment"> * (the "License"); you may not use this file except in compliance with</em><a name="7" href="#7">7</a> <em class="jxr_comment"> * the License. You may obtain a copy of the License at</em><a name="8" href="#8">8</a> <em class="jxr_comment"> * </em><a name="9" href="#9">9</a> <em class="jxr_comment"> * <a href="http://www.apache.org/licenses/LICENSE-2.0" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0</a></em><a name="10" href="#10">10</a> <em class="jxr_comment"> * </em><a name="11" href="#11">11</a> <em class="jxr_comment"> * Unless required by applicable law or agreed to in writing, software</em><a name="12" href="#12">12</a> <em class="jxr_comment"> * distributed under the License is distributed on an "AS IS" BASIS,</em><a name="13" href="#13">13</a> <em class="jxr_comment"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</em><a name="14" href="#14">14</a> <em class="jxr_comment"> * See the License for the specific language governing permissions and</em><a name="15" href="#15">15</a> <em class="jxr_comment"> * limitations under the License.</em><a name="16" href="#16">16</a> <em class="jxr_comment"> */</em><a name="17" href="#17">17</a> <strong class="jxr_keyword">package</strong> org.apache.mina.integration.ognl;<a name="18" href="#18">18</a> <a name="19" href="#19">19</a> <strong class="jxr_keyword">import</strong> java.util.LinkedHashSet;<a name="20" href="#20">20</a> <strong class="jxr_keyword">import</strong> java.util.Set;<a name="21" href="#21">21</a> <a name="22" href="#22">22</a> <strong class="jxr_keyword">import</strong> ognl.Ognl;<a name="23" href="#23">23</a> <strong class="jxr_keyword">import</strong> ognl.OgnlContext;<a name="24" href="#24">24</a> <strong class="jxr_keyword">import</strong> ognl.OgnlException;<a name="25" href="#25">25</a> <strong class="jxr_keyword">import</strong> ognl.TypeConverter;<a name="26" href="#26">26</a> <a name="27" href="#27">27</a> <strong class="jxr_keyword">import</strong> org.apache.mina.common.IoSession;<a name="28" href="#28">28</a> <a name="29" href="#29">29</a> <em class="jxr_javadoccomment">/**</em><a name="30" href="#30">30</a> <em class="jxr_javadoccomment"> * Finds {@link IoSession}s that match a boolean OGNL expression.</em><a name="31" href="#31">31</a> <em class="jxr_javadoccomment"> * </em><a name="32" href="#32">32</a> <em class="jxr_javadoccomment"> * @author The Apache MINA Project (dev@mina.apache.org)</em><a name="33" href="#33">33</a> <em class="jxr_javadoccomment"> * @version $Rev: 601229 $, $Date: 2007-12-05 00:13:18 -0700 (Wed, 05 Dec 2007) $</em><a name="34" href="#34">34</a> <em class="jxr_javadoccomment"> */</em><a name="35" href="#35">35</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../../org/apache/mina/integration/ognl/IoSessionFinder.html">IoSessionFinder</a> {<a name="36" href="#36">36</a> <a name="37" href="#37">37</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> String query;<a name="38" href="#38">38</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> TypeConverter typeConverter = <strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/mina/integration/ognl/PropertyTypeConverter.html">PropertyTypeConverter</a>();<a name="39" href="#39">39</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> Object expression;<a name="40" href="#40">40</a> <a name="41" href="#41">41</a> <em class="jxr_javadoccomment">/**</em><a name="42" href="#42">42</a> <em class="jxr_javadoccomment"> * Creates a new instance with the specified OGNL expression that returns</em><a name="43" href="#43">43</a> <em class="jxr_javadoccomment"> * a boolean value (e.g. <tt>"id == 0x12345678"</tt>).</em><a name="44" href="#44">44</a> <em class="jxr_javadoccomment"> */</em><a name="45" href="#45">45</a> <strong class="jxr_keyword">public</strong> <a href="../../../../../org/apache/mina/integration/ognl/IoSessionFinder.html">IoSessionFinder</a>(String query) {<a name="46" href="#46">46</a> <strong class="jxr_keyword">if</strong> (query == <strong class="jxr_keyword">null</strong>) {<a name="47" href="#47">47</a> <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> NullPointerException(<span class="jxr_string">"query"</span>);<a name="48" href="#48">48</a> }<a name="49" href="#49">49</a> <a name="50" href="#50">50</a> query = query.trim();<a name="51" href="#51">51</a> <strong class="jxr_keyword">if</strong> (query.length() == 0) {<a name="52" href="#52">52</a> <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalArgumentException(<span class="jxr_string">"query is empty."</span>);<a name="53" href="#53">53</a> }<a name="54" href="#54">54</a> <a name="55" href="#55">55</a> <strong class="jxr_keyword">this</strong>.query = query;<a name="56" href="#56">56</a> <strong class="jxr_keyword">try</strong> {<a name="57" href="#57">57</a> expression = Ognl.parseExpression(query);<a name="58" href="#58">58</a> } <strong class="jxr_keyword">catch</strong> (OgnlException e) {<a name="59" href="#59">59</a> <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalArgumentException(<span class="jxr_string">"query: "</span> + query);<a name="60" href="#60">60</a> }<a name="61" href="#61">61</a> }<a name="62" href="#62">62</a> <a name="63" href="#63">63</a> <em class="jxr_javadoccomment">/**</em><a name="64" href="#64">64</a> <em class="jxr_javadoccomment"> * Finds a {@link Set} of {@link IoSession}s that matches the query</em><a name="65" href="#65">65</a> <em class="jxr_javadoccomment"> * from the specified sessions and returns the matches.</em><a name="66" href="#66">66</a> <em class="jxr_javadoccomment"> * @throws OgnlException if failed to evaluate the OGNL expression</em><a name="67" href="#67">67</a> <em class="jxr_javadoccomment"> */</em><a name="68" href="#68">68</a> <strong class="jxr_keyword">public</strong> Set<IoSession> find(Iterable<IoSession> sessions) <strong class="jxr_keyword">throws</strong> OgnlException {<a name="69" href="#69">69</a> <strong class="jxr_keyword">if</strong> (sessions == <strong class="jxr_keyword">null</strong>) {<a name="70" href="#70">70</a> <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> NullPointerException(<span class="jxr_string">"sessions"</span>);<a name="71" href="#71">71</a> }<a name="72" href="#72">72</a> <a name="73" href="#73">73</a> Set<IoSession> answer = <strong class="jxr_keyword">new</strong> LinkedHashSet<IoSession>();<a name="74" href="#74">74</a> <strong class="jxr_keyword">for</strong> (IoSession s: sessions) {<a name="75" href="#75">75</a> OgnlContext context = (OgnlContext) Ognl.createDefaultContext(s);<a name="76" href="#76">76</a> context.setTypeConverter(typeConverter);<a name="77" href="#77">77</a> context.put(AbstractPropertyAccessor.READ_ONLY_MODE, <strong class="jxr_keyword">true</strong>);<a name="78" href="#78">78</a> context.put(AbstractPropertyAccessor.QUERY, query);<a name="79" href="#79">79</a> Object result = Ognl.getValue(expression, context, s);<a name="80" href="#80">80</a> <strong class="jxr_keyword">if</strong> (result instanceof Boolean) {<a name="81" href="#81">81</a> <strong class="jxr_keyword">if</strong> (((Boolean) result).booleanValue()) {<a name="82" href="#82">82</a> answer.add(s);<a name="83" href="#83">83</a> }<a name="84" href="#84">84</a> } <strong class="jxr_keyword">else</strong> {<a name="85" href="#85">85</a> <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> OgnlException(<a name="86" href="#86">86</a> <span class="jxr_string">"Query didn't return a boolean value: "</span> + query);<a name="87" href="#87">87</a> }<a name="88" href="#88">88</a> }<a name="89" href="#89">89</a> <a name="90" href="#90">90</a> <strong class="jxr_keyword">return</strong> answer;<a name="91" href="#91">91</a> }<a name="92" href="#92">92</a> 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