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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=ISO-8859-1" /><title>LogFactory xref</title>
+<link type="text/css" rel="stylesheet" href="../../../../stylesheet.css" />
+</head>
+<body>
+<div id="overview"><a href="../../../../../apidocs/org/apache/commons/logging/LogFactory.html">View Javadoc</a></div><pre>
+
+<a name="1" href="#1">1</a> <em class="comment">/*</em>
+<a name="2" href="#2">2</a> <em class="comment"> * Copyright 2001-2004 The Apache Software Foundation.</em>
+<a name="3" href="#3">3</a> <em class="comment"> * </em>
+<a name="4" href="#4">4</a> <em class="comment"> * Licensed under the Apache License, Version 2.0 (the "License");</em>
+<a name="5" href="#5">5</a> <em class="comment"> * you may not use this file except in compliance with the License.</em>
+<a name="6" href="#6">6</a> <em class="comment"> * You may obtain a copy of the License at</em>
+<a name="7" href="#7">7</a> <em class="comment"> * </em>
+<a name="8" href="#8">8</a> <em class="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="9" href="#9">9</a> <em class="comment"> * </em>
+<a name="10" href="#10">10</a> <em class="comment"> * Unless required by applicable law or agreed to in writing, software</em>
+<a name="11" href="#11">11</a> <em class="comment"> * distributed under the License is distributed on an "AS IS" BASIS,</em>
+<a name="12" href="#12">12</a> <em class="comment"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</em>
+<a name="13" href="#13">13</a> <em class="comment"> * See the License for the specific language governing permissions and</em>
+<a name="14" href="#14">14</a> <em class="comment"> * limitations under the License.</em>
+<a name="15" href="#15">15</a> <em class="comment"> */</em>
+<a name="16" href="#16">16</a>
+<a name="17" href="#17">17</a> <strong>package</strong> <a href="../../../../org/apache/commons/logging/package-summary.html">org.apache.commons.logging</a>;
+<a name="18" href="#18">18</a>
+<a name="19" href="#19">19</a>
+<a name="20" href="#20">20</a> <strong>import</strong> java.io.BufferedReader;
+<a name="21" href="#21">21</a> <strong>import</strong> java.io.IOException;
+<a name="22" href="#22">22</a> <strong>import</strong> java.io.InputStream;
+<a name="23" href="#23">23</a> <strong>import</strong> java.io.InputStreamReader;
+<a name="24" href="#24">24</a> <strong>import</strong> java.lang.reflect.InvocationTargetException;
+<a name="25" href="#25">25</a> <strong>import</strong> java.lang.reflect.Method;
+<a name="26" href="#26">26</a> <strong>import</strong> java.security.AccessController;
+<a name="27" href="#27">27</a> <strong>import</strong> java.security.PrivilegedAction;
+<a name="28" href="#28">28</a> <strong>import</strong> java.util.Enumeration;
+<a name="29" href="#29">29</a> <strong>import</strong> java.util.Hashtable;
+<a name="30" href="#30">30</a> <strong>import</strong> java.util.Properties;
+<a name="31" href="#31">31</a>
+<a name="32" href="#32">32</a>
+<a name="33" href="#33">33</a> <em>/**<em>*</em></em>
+<a name="34" href="#34">34</a> <em> * <p>Factory for creating {@link Log} instances, with discovery and</em>
+<a name="35" href="#35">35</a> <em> * configuration features similar to that employed by standard Java APIs</em>
+<a name="36" href="#36">36</a> <em> * such as JAXP.</p></em>
+<a name="37" href="#37">37</a> <em> *</em>
+<a name="38" href="#38">38</a> <em> * <p><strong>IMPLEMENTATION NOTE</strong> - This implementation is heavily</em>
+<a name="39" href="#39">39</a> <em> * based on the SAXParserFactory and DocumentBuilderFactory implementations</em>
+<a name="40" href="#40">40</a> <em> * (corresponding to the JAXP pluggability APIs) found in Apache Xerces.</p></em>
+<a name="41" href="#41">41</a> <em> *</em>
+<a name="42" href="#42">42</a> <em> * @author Craig R. McClanahan</em>
+<a name="43" href="#43">43</a> <em> * @author Costin Manolache</em>
+<a name="44" href="#44">44</a> <em> * @author Richard A. Sitze</em>
+<a name="45" href="#45">45</a> <em> * @version $Revision$ $Date: 2004/06/06 21:15:12 $</em>
+<a name="46" href="#46">46</a> <em> */</em>
+<a name="47" href="#47">47</a>
+<a name="48" href="#48">48</a> <strong>public</strong> <strong>abstract</strong> <strong>class</strong> <a href="../../../../org/apache/commons/logging/LogFactory.html">LogFactory</a> {
+<a name="49" href="#49">49</a>
+<a name="50" href="#50">50</a>
+<a name="51" href="#51">51</a> <em class="comment">// ----------------------------------------------------- Manifest Constants</em>
+<a name="52" href="#52">52</a>
+<a name="53" href="#53">53</a>
+<a name="54" href="#54">54</a> <em>/**<em>*</em></em>
+<a name="55" href="#55">55</a> <em> * The name of the property used to identify the LogFactory implementation</em>
+<a name="56" href="#56">56</a> <em> * class name.</em>
+<a name="57" href="#57">57</a> <em> */</em>
+<a name="58" href="#58">58</a> <strong>public</strong> <strong>static</strong> <strong>final</strong> String FACTORY_PROPERTY =
+<a name="59" href="#59">59</a> <span class="string">"org.apache.commons.logging.LogFactory"</span>;
+<a name="60" href="#60">60</a>
+<a name="61" href="#61">61</a> <em>/**<em>*</em></em>
+<a name="62" href="#62">62</a> <em> * The fully qualified class name of the fallback <code>LogFactory</code></em>
+<a name="63" href="#63">63</a> <em> * implementation class to use, if no other can be found.</em>
+<a name="64" href="#64">64</a> <em> */</em>
+<a name="65" href="#65">65</a> <strong>public</strong> <strong>static</strong> <strong>final</strong> String FACTORY_DEFAULT =
+<a name="66" href="#66">66</a> <span class="string">"org.apache.commons.logging.impl.LogFactoryImpl"</span>;
+<a name="67" href="#67">67</a>
+<a name="68" href="#68">68</a> <em>/**<em>*</em></em>
+<a name="69" href="#69">69</a> <em> * The name of the properties file to search for.</em>
+<a name="70" href="#70">70</a> <em> */</em>
+<a name="71" href="#71">71</a> <strong>public</strong> <strong>static</strong> <strong>final</strong> String FACTORY_PROPERTIES =
+<a name="72" href="#72">72</a> <span class="string">"commons-logging.properties"</span>;
+<a name="73" href="#73">73</a>
+<a name="74" href="#74">74</a> <em>/**<em>*</em></em>
+<a name="75" href="#75">75</a> <em> * JDK1.3+ <a href="<a href="http://java.sun.com/j2se/1.3/docs/guide/jar/jar.html" target="alexandria_uri">http://java.sun.com/j2se/1.3/docs/guide/jar/jar.html</a>#Service%20Provider"></em>
+<a name="76" href="#76">76</a> <em> * 'Service Provider' specification</a>.</em>
+<a name="77" href="#77">77</a> <em> * </em>
+<a name="78" href="#78">78</a> <em> */</em>
+<a name="79" href="#79">79</a> <strong>protected</strong> <strong>static</strong> <strong>final</strong> String SERVICE_ID =
+<a name="80" href="#80">80</a> <span class="string">"META-INF/services/org.apache.commons.logging.LogFactory"</span>;
+<a name="81" href="#81">81</a>
+<a name="82" href="#82">82</a>
+<a name="83" href="#83">83</a> <em class="comment">// ----------------------------------------------------------- Constructors</em>
+<a name="84" href="#84">84</a>
+<a name="85" href="#85">85</a>
+<a name="86" href="#86">86</a> <em>/**<em>*</em></em>
+<a name="87" href="#87">87</a> <em> * Protected constructor that is not available for public use.</em>
+<a name="88" href="#88">88</a> <em> */</em>
+<a name="89" href="#89">89</a> <strong>protected</strong> <a href="../../../../org/apache/commons/logging/LogFactory.html">LogFactory</a>() { }
+<a name="90" href="#90">90</a>
+<a name="91" href="#91">91</a>
+<a name="92" href="#92">92</a> <em class="comment">// --------------------------------------------------------- Public Methods</em>
+<a name="93" href="#93">93</a>
+<a name="94" href="#94">94</a>
+<a name="95" href="#95">95</a> <em>/**<em>*</em></em>
+<a name="96" href="#96">96</a> <em> * Return the configuration attribute with the specified name (if any),</em>
+<a name="97" href="#97">97</a> <em> * or <code>null</code> if there is no such attribute.</em>
+<a name="98" href="#98">98</a> <em> *</em>
+<a name="99" href="#99">99</a> <em> * @param name Name of the attribute to return</em>
+<a name="100" href="#100">100</a> <em> */</em>
+<a name="101" href="#101">101</a> <strong>public</strong> <strong>abstract</strong> Object getAttribute(String name);
+<a name="102" href="#102">102</a>
+<a name="103" href="#103">103</a>
+<a name="104" href="#104">104</a> <em>/**<em>*</em></em>
+<a name="105" href="#105">105</a> <em> * Return an array containing the names of all currently defined</em>
+<a name="106" href="#106">106</a> <em> * configuration attributes. If there are no such attributes, a zero</em>
+<a name="107" href="#107">107</a> <em> * length array is returned.</em>
+<a name="108" href="#108">108</a> <em> */</em>
+<a name="109" href="#109">109</a> <strong>public</strong> <strong>abstract</strong> String[] getAttributeNames();
+<a name="110" href="#110">110</a>
+<a name="111" href="#111">111</a>
+<a name="112" href="#112">112</a> <em>/**<em>*</em></em>
+<a name="113" href="#113">113</a> <em> * Convenience method to derive a name from the specified class and</em>
+<a name="114" href="#114">114</a> <em> * call <code>getInstance(String)</code> with it.</em>
+<a name="115" href="#115">115</a> <em> *</em>
+<a name="116" href="#116">116</a> <em> * @param clazz Class for which a suitable Log name will be derived</em>
+<a name="117" href="#117">117</a> <em> *</em>
+<a name="118" href="#118">118</a> <em> * @exception LogConfigurationException if a suitable <code>Log</code></em>
+<a name="119" href="#119">119</a> <em> * instance cannot be returned</em>
+<a name="120" href="#120">120</a> <em> */</em>
+<a name="121" href="#121">121</a> <strong>public</strong> <strong>abstract</strong> <a href="../../../../org/apache/commons/logging/Log.html">Log</a> getInstance(Class clazz)
+<a name="122" href="#122">122</a> throws LogConfigurationException;
+<a name="123" href="#123">123</a>
+<a name="124" href="#124">124</a>
+<a name="125" href="#125">125</a> <em>/**<em>*</em></em>
+<a name="126" href="#126">126</a> <em> * <p>Construct (if necessary) and return a <code>Log</code> instance,</em>
+<a name="127" href="#127">127</a> <em> * using the factory's current set of configuration attributes.</p></em>
+<a name="128" href="#128">128</a> <em> *</em>
+<a name="129" href="#129">129</a> <em> * <p><strong>NOTE</strong> - Depending upon the implementation of</em>
+<a name="130" href="#130">130</a> <em> * the <code>LogFactory</code> you are using, the <code>Log</code></em>
+<a name="131" href="#131">131</a> <em> * instance you are returned may or may not be local to the current</em>
+<a name="132" href="#132">132</a> <em> * application, and may or may not be returned again on a subsequent</em>
+<a name="133" href="#133">133</a> <em> * call with the same name argument.</p></em>
+<a name="134" href="#134">134</a> <em> *</em>
+<a name="135" href="#135">135</a> <em> * @param name Logical name of the <code>Log</code> instance to be</em>
+<a name="136" href="#136">136</a> <em> * returned (the meaning of this name is only known to the underlying</em>
+<a name="137" href="#137">137</a> <em> * logging implementation that is being wrapped)</em>
+<a name="138" href="#138">138</a> <em> *</em>
+<a name="139" href="#139">139</a> <em> * @exception LogConfigurationException if a suitable <code>Log</code></em>
+<a name="140" href="#140">140</a> <em> * instance cannot be returned</em>
+<a name="141" href="#141">141</a> <em> */</em>
+<a name="142" href="#142">142</a> <strong>public</strong> <strong>abstract</strong> <a href="../../../../org/apache/commons/logging/Log.html">Log</a> getInstance(String name)
+<a name="143" href="#143">143</a> throws LogConfigurationException;
+<a name="144" href="#144">144</a>
+<a name="145" href="#145">145</a>
+<a name="146" href="#146">146</a> <em>/**<em>*</em></em>
+<a name="147" href="#147">147</a> <em> * Release any internal references to previously created {@link Log}</em>
+<a name="148" href="#148">148</a> <em> * instances returned by this factory. This is useful in environments</em>
+<a name="149" href="#149">149</a> <em> * like servlet containers, which implement application reloading by</em>
+<a name="150" href="#150">150</a> <em> * throwing away a ClassLoader. Dangling references to objects in that</em>
+<a name="151" href="#151">151</a> <em> * class loader would prevent garbage collection.</em>
+<a name="152" href="#152">152</a> <em> */</em>
+<a name="153" href="#153">153</a> <strong>public</strong> <strong>abstract</strong> <strong>void</strong> release();
+<a name="154" href="#154">154</a>
+<a name="155" href="#155">155</a>
+<a name="156" href="#156">156</a> <em>/**<em>*</em></em>
+<a name="157" href="#157">157</a> <em> * Remove any configuration attribute associated with the specified name.</em>
+<a name="158" href="#158">158</a> <em> * If there is no such attribute, no action is taken.</em>
+<a name="159" href="#159">159</a> <em> *</em>
+<a name="160" href="#160">160</a> <em> * @param name Name of the attribute to remove</em>
+<a name="161" href="#161">161</a> <em> */</em>
+<a name="162" href="#162">162</a> <strong>public</strong> <strong>abstract</strong> <strong>void</strong> removeAttribute(String name);
+<a name="163" href="#163">163</a>
+<a name="164" href="#164">164</a>
+<a name="165" href="#165">165</a> <em>/**<em>*</em></em>
+<a name="166" href="#166">166</a> <em> * Set the configuration attribute with the specified name. Calling</em>
+<a name="167" href="#167">167</a> <em> * this with a <code>null</code> value is equivalent to calling</em>
+<a name="168" href="#168">168</a> <em> * <code>removeAttribute(name)</code>.</em>
+<a name="169" href="#169">169</a> <em> *</em>
+<a name="170" href="#170">170</a> <em> * @param name Name of the attribute to set</em>
+<a name="171" href="#171">171</a> <em> * @param value Value of the attribute to set, or <code>null</code></em>
+<a name="172" href="#172">172</a> <em> * to remove any setting for this attribute</em>
+<a name="173" href="#173">173</a> <em> */</em>
+<a name="174" href="#174">174</a> <strong>public</strong> <strong>abstract</strong> <strong>void</strong> setAttribute(String name, Object value);
+<a name="175" href="#175">175</a>
+<a name="176" href="#176">176</a>
+<a name="177" href="#177">177</a> <em class="comment">// ------------------------------------------------------- Static Variables</em>
+<a name="178" href="#178">178</a>
+<a name="179" href="#179">179</a>
+<a name="180" href="#180">180</a> <em>/**<em>*</em></em>
+<a name="181" href="#181">181</a> <em> * The previously constructed <code>LogFactory</code> instances, keyed by</em>
+<a name="182" href="#182">182</a> <em> * the <code>ClassLoader</code> with which it was created.</em>
+<a name="183" href="#183">183</a> <em> */</em>
+<a name="184" href="#184">184</a> <strong>protected</strong> <strong>static</strong> Hashtable factories = <strong>new</strong> Hashtable();
+<a name="185" href="#185">185</a>
+<a name="186" href="#186">186</a>
+<a name="187" href="#187">187</a> <em class="comment">// --------------------------------------------------------- Static Methods</em>
+<a name="188" href="#188">188</a>
+<a name="189" href="#189">189</a>
+<a name="190" href="#190">190</a> <em>/**<em>*</em></em>
+<a name="191" href="#191">191</a> <em> * <p>Construct (if necessary) and return a <code>LogFactory</code></em>
+<a name="192" href="#192">192</a> <em> * instance, using the following ordered lookup procedure to determine</em>
+<a name="193" href="#193">193</a> <em> * the name of the implementation class to be loaded.</p></em>
+<a name="194" href="#194">194</a> <em> * <ul></em>
+<a name="195" href="#195">195</a> <em> * <li>The <code>org.apache.commons.logging.LogFactory</code> system</em>
+<a name="196" href="#196">196</a> <em> * property.</li></em>
+<a name="197" href="#197">197</a> <em> * <li>The JDK 1.3 Service Discovery mechanism</li></em>
+<a name="198" href="#198">198</a> <em> * <li>Use the properties file <code>commons-logging.properties</code></em>
+<a name="199" href="#199">199</a> <em> * file, if found in the class path of this class. The configuration</em>
+<a name="200" href="#200">200</a> <em> * file is in standard <code>java.util.Properties</code> format and</em>
+<a name="201" href="#201">201</a> <em> * contains the fully qualified name of the implementation class</em>
+<a name="202" href="#202">202</a> <em> * with the key being the system property defined above.</li></em>
+<a name="203" href="#203">203</a> <em> * <li>Fall back to a default implementation class</em>
+<a name="204" href="#204">204</a> <em> * (<code>org.apache.commons.logging.impl.LogFactoryImpl</code>).</li></em>
+<a name="205" href="#205">205</a> <em> * </ul></em>
+<a name="206" href="#206">206</a> <em> *</em>
+<a name="207" href="#207">207</a> <em> * <p><em>NOTE</em> - If the properties file method of identifying the</em>
+<a name="208" href="#208">208</a> <em> * <code>LogFactory</code> implementation class is utilized, all of the</em>
+<a name="209" href="#209">209</a> <em> * properties defined in this file will be set as configuration attributes</em>
+<a name="210" href="#210">210</a> <em> * on the corresponding <code>LogFactory</code> instance.</p></em>
+<a name="211" href="#211">211</a> <em> *</em>
+<a name="212" href="#212">212</a> <em> * @exception LogConfigurationException if the implementation class is not</em>
+<a name="213" href="#213">213</a> <em> * available or cannot be instantiated.</em>
+<a name="214" href="#214">214</a> <em> */</em>
+<a name="215" href="#215">215</a> <strong>public</strong> <strong>static</strong> <a href="../../../../org/apache/commons/logging/LogFactory.html">LogFactory</a> getFactory() throws LogConfigurationException {
+<a name="216" href="#216">216</a>
+<a name="217" href="#217">217</a> <em class="comment">// Identify the class loader we will be using</em>
+<a name="218" href="#218">218</a> ClassLoader contextClassLoader =
+<a name="219" href="#219">219</a> (ClassLoader)AccessController.doPrivileged(
+<a name="220" href="#220">220</a> <strong>new</strong> PrivilegedAction() {
+<a name="221" href="#221">221</a> <strong>public</strong> Object run() {
+<a name="222" href="#222">222</a> <strong>return</strong> getContextClassLoader();
+<a name="223" href="#223">223</a> }
+<a name="224" href="#224">224</a> });
+<a name="225" href="#225">225</a>
+<a name="226" href="#226">226</a> <em class="comment">// Return any previously registered factory for this class loader</em>
+<a name="227" href="#227">227</a> <a href="../../../../org/apache/commons/logging/LogFactory.html">LogFactory</a> factory = getCachedFactory(contextClassLoader);
+<a name="228" href="#228">228</a> <strong>if</strong> (factory != <strong>null</strong>)
+<a name="229" href="#229">229</a> <strong>return</strong> factory;
+<a name="230" href="#230">230</a>
+<a name="231" href="#231">231</a>
+<a name="232" href="#232">232</a> <em class="comment">// Load properties file.</em>
+<a name="233" href="#233">233</a> <em class="comment">// Will be used one way or another in the end.</em>
+<a name="234" href="#234">234</a>
+<a name="235" href="#235">235</a> Properties props=<strong>null</strong>;
+<a name="236" href="#236">236</a> <strong>try</strong> {
+<a name="237" href="#237">237</a> InputStream stream = getResourceAsStream(contextClassLoader,
+<a name="238" href="#238">238</a> FACTORY_PROPERTIES);
+<a name="239" href="#239">239</a>
+<a name="240" href="#240">240</a> <strong>if</strong> (stream != <strong>null</strong>) {
+<a name="241" href="#241">241</a> props = <strong>new</strong> Properties();
+<a name="242" href="#242">242</a> props.load(stream);
+<a name="243" href="#243">243</a> stream.close();
+<a name="244" href="#244">244</a> }
+<a name="245" href="#245">245</a> } <strong>catch</strong> (IOException e) {
+<a name="246" href="#246">246</a> } <strong>catch</strong> (SecurityException e) {
+<a name="247" href="#247">247</a> }
+<a name="248" href="#248">248</a>
+<a name="249" href="#249">249</a>
+<a name="250" href="#250">250</a> <em class="comment">// First, try the system property</em>
+<a name="251" href="#251">251</a> <strong>try</strong> {
+<a name="252" href="#252">252</a> String factoryClass = System.getProperty(FACTORY_PROPERTY);
+<a name="253" href="#253">253</a> <strong>if</strong> (factoryClass != <strong>null</strong>) {
+<a name="254" href="#254">254</a> factory = newFactory(factoryClass, contextClassLoader);
+<a name="255" href="#255">255</a> }
+<a name="256" href="#256">256</a> } <strong>catch</strong> (SecurityException e) {
+<a name="257" href="#257">257</a> ; <em class="comment">// ignore</em>
+<a name="258" href="#258">258</a> }
+<a name="259" href="#259">259</a>
+<a name="260" href="#260">260</a>
+<a name="261" href="#261">261</a> <em class="comment">// Second, try to find a service by using the JDK1.3 jar</em>
+<a name="262" href="#262">262</a> <em class="comment">// discovery mechanism. This will allow users to plug a logger</em>
+<a name="263" href="#263">263</a> <em class="comment">// by just placing it in the lib/ directory of the webapp ( or in</em>
+<a name="264" href="#264">264</a> <em class="comment">// CLASSPATH or equivalent ). This is similar to the second</em>
+<a name="265" href="#265">265</a> <em class="comment">// step, except that it uses the (standard?) jdk1.3 location in the jar.</em>
+<a name="266" href="#266">266</a>
+<a name="267" href="#267">267</a> <strong>if</strong> (factory == <strong>null</strong>) {
+<a name="268" href="#268">268</a> <strong>try</strong> {
+<a name="269" href="#269">269</a> InputStream is = getResourceAsStream(contextClassLoader,
+<a name="270" href="#270">270</a> SERVICE_ID);
+<a name="271" href="#271">271</a>
+<a name="272" href="#272">272</a> <strong>if</strong>( is != <strong>null</strong> ) {
+<a name="273" href="#273">273</a> <em class="comment">// This code is needed by EBCDIC and other strange systems.</em>
+<a name="274" href="#274">274</a> <em class="comment">// It's a fix for bugs reported in xerces</em>
+<a name="275" href="#275">275</a> BufferedReader rd;
+<a name="276" href="#276">276</a> <strong>try</strong> {
+<a name="277" href="#277">277</a> rd = <strong>new</strong> BufferedReader(<strong>new</strong> InputStreamReader(is, <span class="string">"UTF-8"</span>));
+<a name="278" href="#278">278</a> } <strong>catch</strong> (java.io.UnsupportedEncodingException e) {
+<a name="279" href="#279">279</a> rd = <strong>new</strong> BufferedReader(<strong>new</strong> InputStreamReader(is));
+<a name="280" href="#280">280</a> }
+<a name="281" href="#281">281</a>
+<a name="282" href="#282">282</a> String factoryClassName = rd.readLine();
+<a name="283" href="#283">283</a> rd.close();
+<a name="284" href="#284">284</a>
+<a name="285" href="#285">285</a> <strong>if</strong> (factoryClassName != <strong>null</strong> &&
+<a name="286" href="#286">286</a> ! <span class="string">""</span>.equals(factoryClassName)) {
+<a name="287" href="#287">287</a>
+<a name="288" href="#288">288</a> factory= newFactory( factoryClassName, contextClassLoader );
+<a name="289" href="#289">289</a> }
+<a name="290" href="#290">290</a> }
+<a name="291" href="#291">291</a> } <strong>catch</strong>( Exception ex ) {
+<a name="292" href="#292">292</a> ;
+<a name="293" href="#293">293</a> }
+<a name="294" href="#294">294</a> }
+<a name="295" href="#295">295</a>
+<a name="296" href="#296">296</a>
+<a name="297" href="#297">297</a> <em class="comment">// Third try a properties file.</em>
+<a name="298" href="#298">298</a> <em class="comment">// If the properties file exists, it'll be read and the properties</em>
+<a name="299" href="#299">299</a> <em class="comment">// used. IMHO ( costin ) System property and JDK1.3 jar service</em>
+<a name="300" href="#300">300</a> <em class="comment">// should be enough for detecting the class name. The properties</em>
+<a name="301" href="#301">301</a> <em class="comment">// should be used to set the attributes ( which may be specific to</em>
+<a name="302" href="#302">302</a> <em class="comment">// the webapp, even if a default logger is set at JVM level by a</em>
+<a name="303" href="#303">303</a> <em class="comment">// system property )</em>
+<a name="304" href="#304">304</a>
+<a name="305" href="#305">305</a> <strong>if</strong> (factory == <strong>null</strong> && props != <strong>null</strong>) {
+<a name="306" href="#306">306</a> String factoryClass = props.getProperty(FACTORY_PROPERTY);
+<a name="307" href="#307">307</a> <strong>if</strong> (factoryClass != <strong>null</strong>) {
+<a name="308" href="#308">308</a> factory = newFactory(factoryClass, contextClassLoader);
+<a name="309" href="#309">309</a> }
+<a name="310" href="#310">310</a> }
+<a name="311" href="#311">311</a>
+<a name="312" href="#312">312</a>
+<a name="313" href="#313">313</a> <em class="comment">// Fourth, try the fallback implementation class</em>
+<a name="314" href="#314">314</a>
+<a name="315" href="#315">315</a> <strong>if</strong> (factory == <strong>null</strong>) {
+<a name="316" href="#316">316</a> factory = newFactory(FACTORY_DEFAULT, LogFactory.<strong>class</strong>.getClassLoader());
+<a name="317" href="#317">317</a> }
+<a name="318" href="#318">318</a>
+<a name="319" href="#319">319</a> <strong>if</strong> (factory != <strong>null</strong>) {
+<a name="320" href="#320">320</a> <em>/**<em>*</em></em>
+<a name="321" href="#321">321</a> <em> * Always cache using context class loader.</em>
+<a name="322" href="#322">322</a> <em> */</em>
+<a name="323" href="#323">323</a> cacheFactory(contextClassLoader, factory);
+<a name="324" href="#324">324</a>
+<a name="325" href="#325">325</a> <strong>if</strong>( props!=<strong>null</strong> ) {
+<a name="326" href="#326">326</a> Enumeration names = props.propertyNames();
+<a name="327" href="#327">327</a> <strong>while</strong> (names.hasMoreElements()) {
+<a name="328" href="#328">328</a> String name = (String) names.nextElement();
+<a name="329" href="#329">329</a> String value = props.getProperty(name);
+<a name="330" href="#330">330</a> factory.setAttribute(name, value);
+<a name="331" href="#331">331</a> }
+<a name="332" href="#332">332</a> }
+<a name="333" href="#333">333</a> }
+<a name="334" href="#334">334</a>
+<a name="335" href="#335">335</a> <strong>return</strong> factory;
+<a name="336" href="#336">336</a> }
+<a name="337" href="#337">337</a>
+<a name="338" href="#338">338</a>
+<a name="339" href="#339">339</a> <em>/**<em>*</em></em>
+<a name="340" href="#340">340</a> <em> * Convenience method to return a named logger, without the application</em>
+<a name="341" href="#341">341</a> <em> * having to care about factories.</em>
+<a name="342" href="#342">342</a> <em> *</em>
+<a name="343" href="#343">343</a> <em> * @param clazz Class from which a log name will be derived</em>
+<a name="344" href="#344">344</a> <em> *</em>
+<a name="345" href="#345">345</a> <em> * @exception LogConfigurationException if a suitable <code>Log</code></em>
+<a name="346" href="#346">346</a> <em> * instance cannot be returned</em>
+<a name="347" href="#347">347</a> <em> */</em>
+<a name="348" href="#348">348</a> <strong>public</strong> <strong>static</strong> <a href="../../../../org/apache/commons/logging/Log.html">Log</a> getLog(Class clazz)
+<a name="349" href="#349">349</a> throws <a href="../../../../org/apache/commons/logging/LogConfigurationException.html">LogConfigurationException</a> {
+<a name="350" href="#350">350</a>
+<a name="351" href="#351">351</a> <strong>return</strong> (getFactory().getInstance(clazz));
+<a name="352" href="#352">352</a>
+<a name="353" href="#353">353</a> }
+<a name="354" href="#354">354</a>
+<a name="355" href="#355">355</a>
+<a name="356" href="#356">356</a> <em>/**<em>*</em></em>
+<a name="357" href="#357">357</a> <em> * Convenience method to return a named logger, without the application</em>
+<a name="358" href="#358">358</a> <em> * having to care about factories.</em>
+<a name="359" href="#359">359</a> <em> *</em>
+<a name="360" href="#360">360</a> <em> * @param name Logical name of the <code>Log</code> instance to be</em>
+<a name="361" href="#361">361</a> <em> * returned (the meaning of this name is only known to the underlying</em>
+<a name="362" href="#362">362</a> <em> * logging implementation that is being wrapped)</em>
+<a name="363" href="#363">363</a> <em> *</em>
+<a name="364" href="#364">364</a> <em> * @exception LogConfigurationException if a suitable <code>Log</code></em>
+<a name="365" href="#365">365</a> <em> * instance cannot be returned</em>
+<a name="366" href="#366">366</a> <em> */</em>
+<a name="367" href="#367">367</a> <strong>public</strong> <strong>static</strong> <a href="../../../../org/apache/commons/logging/Log.html">Log</a> getLog(String name)
+<a name="368" href="#368">368</a> throws <a href="../../../../org/apache/commons/logging/LogConfigurationException.html">LogConfigurationException</a> {
+<a name="369" href="#369">369</a>
+<a name="370" href="#370">370</a> <strong>return</strong> (getFactory().getInstance(name));
+<a name="371" href="#371">371</a>
+<a name="372" href="#372">372</a> }
+<a name="373" href="#373">373</a>
+<a name="374" href="#374">374</a>
+<a name="375" href="#375">375</a> <em>/**<em>*</em></em>
+<a name="376" href="#376">376</a> <em> * Release any internal references to previously created {@link LogFactory}</em>
+<a name="377" href="#377">377</a> <em> * instances that have been associated with the specified class loader</em>
+<a name="378" href="#378">378</a> <em> * (if any), after calling the instance method <code>release()</code> on</em>
+<a name="379" href="#379">379</a> <em> * each of them.</em>
+<a name="380" href="#380">380</a> <em> *</em>
+<a name="381" href="#381">381</a> <em> * @param classLoader ClassLoader for which to release the LogFactory</em>
+<a name="382" href="#382">382</a> <em> */</em>
+<a name="383" href="#383">383</a> <strong>public</strong> <strong>static</strong> <strong>void</strong> release(ClassLoader classLoader) {
+<a name="384" href="#384">384</a>
+<a name="385" href="#385">385</a> <strong>synchronized</strong> (factories) {
+<a name="386" href="#386">386</a> <a href="../../../../org/apache/commons/logging/LogFactory.html">LogFactory</a> factory = (LogFactory) factories.get(classLoader);
+<a name="387" href="#387">387</a> <strong>if</strong> (factory != <strong>null</strong>) {
+<a name="388" href="#388">388</a> factory.release();
+<a name="389" href="#389">389</a> factories.remove(classLoader);
+<a name="390" href="#390">390</a> }
+<a name="391" href="#391">391</a> }
+<a name="392" href="#392">392</a>
+<a name="393" href="#393">393</a> }
+<a name="394" href="#394">394</a>
+<a name="395" href="#395">395</a>
+<a name="396" href="#396">396</a> <em>/**<em>*</em></em>
+<a name="397" href="#397">397</a> <em> * Release any internal references to previously created {@link LogFactory}</em>
+<a name="398" href="#398">398</a> <em> * instances, after calling the instance method <code>release()</code> on</em>
+<a name="399" href="#399">399</a> <em> * each of them. This is useful in environments like servlet containers,</em>
+<a name="400" href="#400">400</a> <em> * which implement application reloading by throwing away a ClassLoader.</em>
+<a name="401" href="#401">401</a> <em> * Dangling references to objects in that class loader would prevent</em>
+<a name="402" href="#402">402</a> <em> * garbage collection.</em>
+<a name="403" href="#403">403</a> <em> */</em>
+<a name="404" href="#404">404</a> <strong>public</strong> <strong>static</strong> <strong>void</strong> releaseAll() {
+<a name="405" href="#405">405</a>
+<a name="406" href="#406">406</a> <strong>synchronized</strong> (factories) {
+<a name="407" href="#407">407</a> Enumeration elements = factories.elements();
+<a name="408" href="#408">408</a> <strong>while</strong> (elements.hasMoreElements()) {
+<a name="409" href="#409">409</a> <a href="../../../../org/apache/commons/logging/LogFactory.html">LogFactory</a> element = (LogFactory) elements.nextElement();
+<a name="410" href="#410">410</a> element.release();
+<a name="411" href="#411">411</a> }
+<a name="412" href="#412">412</a> factories.clear();
+<a name="413" href="#413">413</a> }
+<a name="414" href="#414">414</a>
+<a name="415" href="#415">415</a> }
+<a name="416" href="#416">416</a>
+<a name="417" href="#417">417</a>
+<a name="418" href="#418">418</a> <em class="comment">// ------------------------------------------------------ Protected Methods</em>
+<a name="419" href="#419">419</a>
+<a name="420" href="#420">420</a>
+<a name="421" href="#421">421</a> <em>/**<em>*</em></em>
+<a name="422" href="#422">422</a> <em> * Return the thread context class loader if available.</em>
+<a name="423" href="#423">423</a> <em> * Otherwise return null.</em>
+<a name="424" href="#424">424</a> <em> *</em>
+<a name="425" href="#425">425</a> <em> * The thread context class loader is available for JDK 1.2</em>
+<a name="426" href="#426">426</a> <em> * or later, if certain security conditions are met.</em>
+<a name="427" href="#427">427</a> <em> *</em>
+<a name="428" href="#428">428</a> <em> * @exception LogConfigurationException if a suitable class loader</em>
+<a name="429" href="#429">429</a> <em> * cannot be identified.</em>
+<a name="430" href="#430">430</a> <em> */</em>
+<a name="431" href="#431">431</a> <strong>protected</strong> <strong>static</strong> ClassLoader getContextClassLoader()
+<a name="432" href="#432">432</a> throws <a href="../../../../org/apache/commons/logging/LogConfigurationException.html">LogConfigurationException</a>
+<a name="433" href="#433">433</a> {
+<a name="434" href="#434">434</a> ClassLoader classLoader = <strong>null</strong>;
+<a name="435" href="#435">435</a>
+<a name="436" href="#436">436</a> <strong>try</strong> {
+<a name="437" href="#437">437</a> <em class="comment">// Are we running on a JDK 1.2 or later system?</em>
+<a name="438" href="#438">438</a> Method method = Thread.<strong>class</strong>.getMethod(<span class="string">"getContextClassLoader"</span>, <strong>null</strong>);
+<a name="439" href="#439">439</a>
+<a name="440" href="#440">440</a> <em class="comment">// Get the thread context class loader (if there is one)</em>
+<a name="441" href="#441">441</a> <strong>try</strong> {
+<a name="442" href="#442">442</a> classLoader = (ClassLoader)method.invoke(Thread.currentThread(), <strong>null</strong>);
+<a name="443" href="#443">443</a> } <strong>catch</strong> (IllegalAccessException e) {
+<a name="444" href="#444">444</a> <strong>throw</strong> <strong>new</strong> <a href="../../../../org/apache/commons/logging/LogConfigurationException.html">LogConfigurationException</a>
+<a name="445" href="#445">445</a> (<span class="string">"Unexpected IllegalAccessException"</span>, e);
+<a name="446" href="#446">446</a> } <strong>catch</strong> (InvocationTargetException e) {
+<a name="447" href="#447">447</a> <em>/**<em>*</em></em>
+<a name="448" href="#448">448</a> <em> * InvocationTargetException is thrown by 'invoke' when</em>
+<a name="449" href="#449">449</a> <em> * the method being invoked (getContextClassLoader) throws</em>
+<a name="450" href="#450">450</a> <em> * an exception.</em>
+<a name="451" href="#451">451</a> <em> *</em>
+<a name="452" href="#452">452</a> <em> * getContextClassLoader() throws SecurityException when</em>
+<a name="453" href="#453">453</a> <em> * the context class loader isn't an ancestor of the</em>
+<a name="454" href="#454">454</a> <em> * calling class's class loader, or if security</em>
+<a name="455" href="#455">455</a> <em> * permissions are restricted.</em>
+<a name="456" href="#456">456</a> <em> *</em>
+<a name="457" href="#457">457</a> <em> * In the first case (not related), we want to ignore and</em>
+<a name="458" href="#458">458</a> <em> * keep going. We cannot help but also ignore the second</em>
+<a name="459" href="#459">459</a> <em> * with the logic below, but other calls elsewhere (to</em>
+<a name="460" href="#460">460</a> <em> * obtain a class loader) will trigger this exception where</em>
+<a name="461" href="#461">461</a> <em> * we can make a distinction.</em>
+<a name="462" href="#462">462</a> <em> */</em>
+<a name="463" href="#463">463</a> <strong>if</strong> (e.getTargetException() instanceof SecurityException) {
+<a name="464" href="#464">464</a> ; <em class="comment">// ignore</em>
+<a name="465" href="#465">465</a> } <strong>else</strong> {
+<a name="466" href="#466">466</a> <em class="comment">// Capture 'e.getTargetException()' exception for details</em>
+<a name="467" href="#467">467</a> <em class="comment">// alternate: log 'e.getTargetException()', and pass back 'e'.</em>
+<a name="468" href="#468">468</a> <strong>throw</strong> <strong>new</strong> <a href="../../../../org/apache/commons/logging/LogConfigurationException.html">LogConfigurationException</a>
+<a name="469" href="#469">469</a> (<span class="string">"Unexpected InvocationTargetException"</span>, e.getTargetException());
+<a name="470" href="#470">470</a> }
+<a name="471" href="#471">471</a> }
+<a name="472" href="#472">472</a> } <strong>catch</strong> (NoSuchMethodException e) {
+<a name="473" href="#473">473</a> <em class="comment">// Assume we are running on JDK 1.1</em>
+<a name="474" href="#474">474</a> <strong>class</strong>Loader = LogFactory.<strong>class</strong>.getClassLoader();
+<a name="475" href="#475">475</a> }
+<a name="476" href="#476">476</a>
+<a name="477" href="#477">477</a> <em class="comment">// Return the selected class loader</em>
+<a name="478" href="#478">478</a> <strong>return</strong> classLoader;
+<a name="479" href="#479">479</a> }
+<a name="480" href="#480">480</a>
+<a name="481" href="#481">481</a> <em>/**<em>*</em></em>
+<a name="482" href="#482">482</a> <em> * Check cached factories (keyed by contextClassLoader)</em>
+<a name="483" href="#483">483</a> <em> */</em>
+<a name="484" href="#484">484</a> <strong>private</strong> <strong>static</strong> <a href="../../../../org/apache/commons/logging/LogFactory.html">LogFactory</a> getCachedFactory(ClassLoader contextClassLoader)
+<a name="485" href="#485">485</a> {
+<a name="486" href="#486">486</a> <a href="../../../../org/apache/commons/logging/LogFactory.html">LogFactory</a> factory = <strong>null</strong>;
+<a name="487" href="#487">487</a>
+<a name="488" href="#488">488</a> <strong>if</strong> (contextClassLoader != <strong>null</strong>)
+<a name="489" href="#489">489</a> factory = (LogFactory) factories.get(contextClassLoader);
+<a name="490" href="#490">490</a>
+<a name="491" href="#491">491</a> <strong>return</strong> factory;
+<a name="492" href="#492">492</a> }
+<a name="493" href="#493">493</a>
+<a name="494" href="#494">494</a> <strong>private</strong> <strong>static</strong> <strong>void</strong> cacheFactory(ClassLoader classLoader, <a href="../../../../org/apache/commons/logging/LogFactory.html">LogFactory</a> factory)
+<a name="495" href="#495">495</a> {
+<a name="496" href="#496">496</a> <strong>if</strong> (classLoader != <strong>null</strong> && factory != <strong>null</strong>)
+<a name="497" href="#497">497</a> factories.put(classLoader, factory);
+<a name="498" href="#498">498</a> }
+<a name="499" href="#499">499</a>
+<a name="500" href="#500">500</a> <em>/**<em>*</em></em>
+<a name="501" href="#501">501</a> <em> * Return a new instance of the specified <code>LogFactory</code></em>
+<a name="502" href="#502">502</a> <em> * implementation class, loaded by the specified class loader.</em>
+<a name="503" href="#503">503</a> <em> * If that fails, try the class loader used to load this</em>
+<a name="504" href="#504">504</a> <em> * (abstract) LogFactory.</em>
+<a name="505" href="#505">505</a> <em> *</em>
+<a name="506" href="#506">506</a> <em> * @param factoryClass Fully qualified name of the <code>LogFactory</code></em>
+<a name="507" href="#507">507</a> <em> * implementation class</em>
+<a name="508" href="#508">508</a> <em> * @param classLoader ClassLoader from which to load this class</em>
+<a name="509" href="#509">509</a> <em> *</em>
+<a name="510" href="#510">510</a> <em> * @exception LogConfigurationException if a suitable instance</em>
+<a name="511" href="#511">511</a> <em> * cannot be created</em>
+<a name="512" href="#512">512</a> <em> */</em>
+<a name="513" href="#513">513</a> <strong>protected</strong> <strong>static</strong> <a href="../../../../org/apache/commons/logging/LogFactory.html">LogFactory</a> newFactory(<strong>final</strong> String factoryClass,
+<a name="514" href="#514">514</a> <strong>final</strong> ClassLoader classLoader)
+<a name="515" href="#515">515</a> throws <a href="../../../../org/apache/commons/logging/LogConfigurationException.html">LogConfigurationException</a>
+<a name="516" href="#516">516</a> {
+<a name="517" href="#517">517</a> Object result = AccessController.doPrivileged(
+<a name="518" href="#518">518</a> <strong>new</strong> PrivilegedAction() {
+<a name="519" href="#519">519</a> <strong>public</strong> Object run() {
+<a name="520" href="#520">520</a> <em class="comment">// This will be used to diagnose bad configurations</em>
+<a name="521" href="#521">521</a> <em class="comment">// and allow a useful message to be sent to the user</em>
+<a name="522" href="#522">522</a> Class logFactoryClass = <strong>null</strong>;
+<a name="523" href="#523">523</a> <strong>try</strong> {
+<a name="524" href="#524">524</a> <strong>if</strong> (classLoader != <strong>null</strong>) {
+<a name="525" href="#525">525</a> <strong>try</strong> {
+<a name="526" href="#526">526</a> <em class="comment">// First the given class loader param (thread class loader)</em>
+<a name="527" href="#527">527</a>
+<a name="528" href="#528">528</a> <em class="comment">// Warning: must typecast here & allow exception</em>
+<a name="529" href="#529">529</a> <em class="comment">// to be generated/caught & recast properly.</em>
+<a name="530" href="#530">530</a> logFactoryClass = classLoader.loadClass(factoryClass);
+<a name="531" href="#531">531</a> <strong>return</strong> (LogFactory) logFactoryClass.newInstance();
+<a name="532" href="#532">532</a>
+<a name="533" href="#533">533</a> } <strong>catch</strong> (ClassNotFoundException ex) {
+<a name="534" href="#534">534</a> <strong>if</strong> (<strong>class</strong>Loader == LogFactory.<strong>class</strong>.getClassLoader()) {
+<a name="535" href="#535">535</a> <em class="comment">// Nothing more to try, onwards.</em>
+<a name="536" href="#536">536</a> <strong>throw</strong> ex;
+<a name="537" href="#537">537</a> }
+<a name="538" href="#538">538</a> <em class="comment">// ignore exception, continue</em>
+<a name="539" href="#539">539</a> } <strong>catch</strong> (NoClassDefFoundError e) {
+<a name="540" href="#540">540</a> <strong>if</strong> (<strong>class</strong>Loader == LogFactory.<strong>class</strong>.getClassLoader()) {
+<a name="541" href="#541">541</a> <em class="comment">// Nothing more to try, onwards.</em>
+<a name="542" href="#542">542</a> <strong>throw</strong> e;
+<a name="543" href="#543">543</a> }
+<a name="544" href="#544">544</a>
+<a name="545" href="#545">545</a> } <strong>catch</strong>(ClassCastException e){
+<a name="546" href="#546">546</a>
+<a name="547" href="#547">547</a> <strong>if</strong> (<strong>class</strong>Loader == LogFactory.<strong>class</strong>.getClassLoader()) {
+<a name="548" href="#548">548</a> <em class="comment">// Nothing more to try, onwards (bug in loader implementation).</em>
+<a name="549" href="#549">549</a> <strong>throw</strong> e;
+<a name="550" href="#550">550</a> }
+<a name="551" href="#551">551</a> }
+<a name="552" href="#552">552</a> <em class="comment">// Ignore exception, continue</em>
+<a name="553" href="#553">553</a> }
+<a name="554" href="#554">554</a>
+<a name="555" href="#555">555</a> <em class="comment">/*<em class="comment"> At this point, either classLoader == null, OR</em></em>
+<a name="556" href="#556">556</a> <em class="comment"> * classLoader was unable to load factoryClass.</em>
+<a name="557" href="#557">557</a> <em class="comment"> * Try the class loader that loaded this class:</em>
+<a name="558" href="#558">558</a> <em class="comment"> * LogFactory.getClassLoader().</em>
+<a name="559" href="#559">559</a> <em class="comment"> *</em>
+<a name="560" href="#560">560</a> <em class="comment"> * Notes:</em>
+<a name="561" href="#561">561</a> <em class="comment"> * a) LogFactory.class.getClassLoader() may return 'null'</em>
+<a name="562" href="#562">562</a> <em class="comment"> * if LogFactory is loaded by the bootstrap classloader.</em>
+<a name="563" href="#563">563</a> <em class="comment"> * b) The Java endorsed library mechanism is instead</em>
+<a name="564" href="#564">564</a> <em class="comment"> * Class.forName(factoryClass);</em>
+<a name="565" href="#565">565</a> <em class="comment"> */</em>
+<a name="566" href="#566">566</a> <em class="comment">// Warning: must typecast here & allow exception</em>
+<a name="567" href="#567">567</a> <em class="comment">// to be generated/caught & recast properly.</em>
+<a name="568" href="#568">568</a> logFactoryClass = Class.forName(factoryClass);
+<a name="569" href="#569">569</a> <strong>return</strong> (LogFactory) logFactoryClass.newInstance();
+<a name="570" href="#570">570</a> } <strong>catch</strong> (Exception e) {
+<a name="571" href="#571">571</a> <em class="comment">// Check to see if we've got a bad configuration</em>
+<a name="572" href="#572">572</a> <strong>if</strong> (logFactoryClass != <strong>null</strong>
+<a name="573" href="#573">573</a> && !LogFactory.<strong>class</strong>.isAssignableFrom(logFactoryClass)) {
+<a name="574" href="#574">574</a> <strong>return</strong> <strong>new</strong> <a href="../../../../org/apache/commons/logging/LogConfigurationException.html">LogConfigurationException</a>(
+<a name="575" href="#575">575</a> <span class="string">"The chosen LogFactory implementation does not extend LogFactory."</span>
+<a name="576" href="#576">576</a> + <span class="string">" Please check your configuration."</span>,
+<a name="577" href="#577">577</a> e);
+<a name="578" href="#578">578</a> }
+<a name="579" href="#579">579</a> <strong>return</strong> <strong>new</strong> <a href="../../../../org/apache/commons/logging/LogConfigurationException.html">LogConfigurationException</a>(e);
+<a name="580" href="#580">580</a> }
+<a name="581" href="#581">581</a> }
+<a name="582" href="#582">582</a> });
+<a name="583" href="#583">583</a>
+<a name="584" href="#584">584</a> <strong>if</strong> (result instanceof LogConfigurationException)
+<a name="585" href="#585">585</a> <strong>throw</strong> (LogConfigurationException)result;
+<a name="586" href="#586">586</a>
+<a name="587" href="#587">587</a> <strong>return</strong> (LogFactory)result;
+<a name="588" href="#588">588</a> }
+<a name="589" href="#589">589</a>
+<a name="590" href="#590">590</a> <strong>private</strong> <strong>static</strong> InputStream getResourceAsStream(<strong>final</strong> ClassLoader loader,
+<a name="591" href="#591">591</a> <strong>final</strong> String name)
+<a name="592" href="#592">592</a> {
+<a name="593" href="#593">593</a> <strong>return</strong> (InputStream)AccessController.doPrivileged(
+<a name="594" href="#594">594</a> <strong>new</strong> PrivilegedAction() {
+<a name="595" href="#595">595</a> <strong>public</strong> Object run() {
+<a name="596" href="#596">596</a> <strong>if</strong> (loader != <strong>null</strong>) {
+<a name="597" href="#597">597</a> <strong>return</strong> loader.getResourceAsStream(name);
+<a name="598" href="#598">598</a> } <strong>else</strong> {
+<a name="599" href="#599">599</a> <strong>return</strong> ClassLoader.getSystemResourceAsStream(name);
+<a name="600" href="#600">600</a> }
+<a name="601" href="#601">601</a> }
+<a name="602" href="#602">602</a> });
+<a name="603" href="#603">603</a> }
+<a name="604" href="#604">604</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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+++ websites/production/commons/content/proper/commons-logging/javadocs/api-1.0.4/xref/org/apache/commons/logging/LogSource.html Tue Mar 5 18:53:06 2013
@@ -0,0 +1,274 @@
+<!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=ISO-8859-1" /><title>LogSource xref</title>
+<link type="text/css" rel="stylesheet" href="../../../../stylesheet.css" />
+</head>
+<body>
+<div id="overview"><a href="../../../../../apidocs/org/apache/commons/logging/LogSource.html">View Javadoc</a></div><pre>
+
+<a name="1" href="#1">1</a> <em class="comment">/*</em>
+<a name="2" href="#2">2</a> <em class="comment"> * Copyright 2001-2004 The Apache Software Foundation.</em>
+<a name="3" href="#3">3</a> <em class="comment"> * </em>
+<a name="4" href="#4">4</a> <em class="comment"> * Licensed under the Apache License, Version 2.0 (the "License");</em>
+<a name="5" href="#5">5</a> <em class="comment"> * you may not use this file except in compliance with the License.</em>
+<a name="6" href="#6">6</a> <em class="comment"> * You may obtain a copy of the License at</em>
+<a name="7" href="#7">7</a> <em class="comment"> * </em>
+<a name="8" href="#8">8</a> <em class="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="9" href="#9">9</a> <em class="comment"> * </em>
+<a name="10" href="#10">10</a> <em class="comment"> * Unless required by applicable law or agreed to in writing, software</em>
+<a name="11" href="#11">11</a> <em class="comment"> * distributed under the License is distributed on an "AS IS" BASIS,</em>
+<a name="12" href="#12">12</a> <em class="comment"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</em>
+<a name="13" href="#13">13</a> <em class="comment"> * See the License for the specific language governing permissions and</em>
+<a name="14" href="#14">14</a> <em class="comment"> * limitations under the License.</em>
+<a name="15" href="#15">15</a> <em class="comment"> */</em>
+<a name="16" href="#16">16</a>
+<a name="17" href="#17">17</a> <strong>package</strong> <a href="../../../../org/apache/commons/logging/package-summary.html">org.apache.commons.logging</a>;
+<a name="18" href="#18">18</a>
+<a name="19" href="#19">19</a>
+<a name="20" href="#20">20</a> <strong>import</strong> java.lang.reflect.Constructor;
+<a name="21" href="#21">21</a> <strong>import</strong> java.util.Hashtable;
+<a name="22" href="#22">22</a>
+<a name="23" href="#23">23</a> <strong>import</strong> org.apache.commons.logging.impl.NoOpLog;
+<a name="24" href="#24">24</a>
+<a name="25" href="#25">25</a>
+<a name="26" href="#26">26</a> <em>/**<em>*</em></em>
+<a name="27" href="#27">27</a> <em> * <p>Factory for creating {@link Log} instances. Applications should call</em>
+<a name="28" href="#28">28</a> <em> * the <code>makeNewLogInstance()</code> method to instantiate new instances</em>
+<a name="29" href="#29">29</a> <em> * of the configured {@link Log} implementation class.</p></em>
+<a name="30" href="#30">30</a> <em> *</em>
+<a name="31" href="#31">31</a> <em> * <p>By default, calling <code>getInstance()</code> will use the following</em>
+<a name="32" href="#32">32</a> <em> * algorithm:</p></em>
+<a name="33" href="#33">33</a> <em> * <ul></em>
+<a name="34" href="#34">34</a> <em> * <li>If Log4J is available, return an instance of</em>
+<a name="35" href="#35">35</a> <em> * <code>org.apache.commons.logging.impl.Log4JLogger</code>.</li></em>
+<a name="36" href="#36">36</a> <em> * <li>If JDK 1.4 or later is available, return an instance of</em>
+<a name="37" href="#37">37</a> <em> * <code>org.apache.commons.logging.impl.Jdk14Logger</code>.</li></em>
+<a name="38" href="#38">38</a> <em> * <li>Otherwise, return an instance of</em>
+<a name="39" href="#39">39</a> <em> * <code>org.apache.commons.logging.impl.NoOpLog</code>.</li></em>
+<a name="40" href="#40">40</a> <em> * </ul></em>
+<a name="41" href="#41">41</a> <em> *</em>
+<a name="42" href="#42">42</a> <em> * <p>You can change the default behavior in one of two ways:</p></em>
+<a name="43" href="#43">43</a> <em> * <ul></em>
+<a name="44" href="#44">44</a> <em> * <li>On the startup command line, set the system property</em>
+<a name="45" href="#45">45</a> <em> * <code>org.apache.commons.logging.log</code> to the name of the</em>
+<a name="46" href="#46">46</a> <em> * <code>org.apache.commons.logging.Log</code> implementation class</em>
+<a name="47" href="#47">47</a> <em> * you want to use.</li></em>
+<a name="48" href="#48">48</a> <em> * <li>At runtime, call <code>LogSource.setLogImplementation()</code>.</li></em>
+<a name="49" href="#49">49</a> <em> * </ul></em>
+<a name="50" href="#50">50</a> <em> *</em>
+<a name="51" href="#51">51</a> <em> * @deprecated Use {@link LogFactory} instead - The default factory</em>
+<a name="52" href="#52">52</a> <em> * implementation performs exactly the same algorithm as this class did</em>
+<a name="53" href="#53">53</a> <em> *</em>
+<a name="54" href="#54">54</a> <em> * @author Rod Waldhoff</em>
+<a name="55" href="#55">55</a> <em> * @version $Id$</em>
+<a name="56" href="#56">56</a> <em> */</em>
+<a name="57" href="#57">57</a> <strong>public</strong> <strong>class</strong> <a href="../../../../org/apache/commons/logging/LogSource.html">LogSource</a> {
+<a name="58" href="#58">58</a>
+<a name="59" href="#59">59</a> <em class="comment">// ------------------------------------------------------- Class Attributes</em>
+<a name="60" href="#60">60</a>
+<a name="61" href="#61">61</a> <strong>static</strong> <strong>protected</strong> Hashtable logs = <strong>new</strong> Hashtable();
+<a name="62" href="#62">62</a>
+<a name="63" href="#63">63</a> <em>/**<em>* Is log4j available (in the current classpath) */</em></em>
+<a name="64" href="#64">64</a> <strong>static</strong> <strong>protected</strong> <strong>boolean</strong> log4jIsAvailable = false;
+<a name="65" href="#65">65</a>
+<a name="66" href="#66">66</a> <em>/**<em>* Is JDK 1.4 logging available */</em></em>
+<a name="67" href="#67">67</a> <strong>static</strong> <strong>protected</strong> <strong>boolean</strong> jdk14IsAvailable = false;
+<a name="68" href="#68">68</a>
+<a name="69" href="#69">69</a> <em>/**<em>* Constructor for current log class */</em></em>
+<a name="70" href="#70">70</a> <strong>static</strong> <strong>protected</strong> Constructor logImplctor = <strong>null</strong>;
+<a name="71" href="#71">71</a>
+<a name="72" href="#72">72</a>
+<a name="73" href="#73">73</a> <em class="comment">// ----------------------------------------------------- Class Initializers</em>
+<a name="74" href="#74">74</a>
+<a name="75" href="#75">75</a> <strong>static</strong> {
+<a name="76" href="#76">76</a>
+<a name="77" href="#77">77</a> <em class="comment">// Is Log4J Available?</em>
+<a name="78" href="#78">78</a> <strong>try</strong> {
+<a name="79" href="#79">79</a> <strong>if</strong> (<strong>null</strong> != Class.forName(<span class="string">"org.apache.log4j.Logger"</span>)) {
+<a name="80" href="#80">80</a> log4jIsAvailable = <strong>true</strong>;
+<a name="81" href="#81">81</a> } <strong>else</strong> {
+<a name="82" href="#82">82</a> log4jIsAvailable = false;
+<a name="83" href="#83">83</a> }
+<a name="84" href="#84">84</a> } <strong>catch</strong> (Throwable t) {
+<a name="85" href="#85">85</a> log4jIsAvailable = false;
+<a name="86" href="#86">86</a> }
+<a name="87" href="#87">87</a>
+<a name="88" href="#88">88</a> <em class="comment">// Is JDK 1.4 Logging Available?</em>
+<a name="89" href="#89">89</a> <strong>try</strong> {
+<a name="90" href="#90">90</a> <strong>if</strong> ((<strong>null</strong> != Class.forName(<span class="string">"java.util.logging.Logger"</span>)) &&
+<a name="91" href="#91">91</a> (<strong>null</strong> != Class.forName(<span class="string">"org.apache.commons.logging.impl.Jdk14Logger"</span>))) {
+<a name="92" href="#92">92</a> jdk14IsAvailable = <strong>true</strong>;
+<a name="93" href="#93">93</a> } <strong>else</strong> {
+<a name="94" href="#94">94</a> jdk14IsAvailable = false;
+<a name="95" href="#95">95</a> }
+<a name="96" href="#96">96</a> } <strong>catch</strong> (Throwable t) {
+<a name="97" href="#97">97</a> jdk14IsAvailable = false;
+<a name="98" href="#98">98</a> }
+<a name="99" href="#99">99</a>
+<a name="100" href="#100">100</a> <em class="comment">// Set the default Log implementation</em>
+<a name="101" href="#101">101</a> String name = <strong>null</strong>;
+<a name="102" href="#102">102</a> <strong>try</strong> {
+<a name="103" href="#103">103</a> name = System.getProperty(<span class="string">"org.apache.commons.logging.log"</span>);
+<a name="104" href="#104">104</a> <strong>if</strong> (name == <strong>null</strong>) {
+<a name="105" href="#105">105</a> name = System.getProperty(<span class="string">"org.apache.commons.logging.Log"</span>);
+<a name="106" href="#106">106</a> }
+<a name="107" href="#107">107</a> } <strong>catch</strong> (Throwable t) {
+<a name="108" href="#108">108</a> }
+<a name="109" href="#109">109</a> <strong>if</strong> (name != <strong>null</strong>) {
+<a name="110" href="#110">110</a> <strong>try</strong> {
+<a name="111" href="#111">111</a> setLogImplementation(name);
+<a name="112" href="#112">112</a> } <strong>catch</strong> (Throwable t) {
+<a name="113" href="#113">113</a> <strong>try</strong> {
+<a name="114" href="#114">114</a> setLogImplementation
+<a name="115" href="#115">115</a> (<span class="string">"org.apache.commons.logging.impl.NoOpLog"</span>);
+<a name="116" href="#116">116</a> } <strong>catch</strong> (Throwable u) {
+<a name="117" href="#117">117</a> ;
+<a name="118" href="#118">118</a> }
+<a name="119" href="#119">119</a> }
+<a name="120" href="#120">120</a> } <strong>else</strong> {
+<a name="121" href="#121">121</a> <strong>try</strong> {
+<a name="122" href="#122">122</a> <strong>if</strong> (log4jIsAvailable) {
+<a name="123" href="#123">123</a> setLogImplementation
+<a name="124" href="#124">124</a> (<span class="string">"org.apache.commons.logging.impl.Log4JLogger"</span>);
+<a name="125" href="#125">125</a> } <strong>else</strong> <strong>if</strong> (jdk14IsAvailable) {
+<a name="126" href="#126">126</a> setLogImplementation
+<a name="127" href="#127">127</a> (<span class="string">"org.apache.commons.logging.impl.Jdk14Logger"</span>);
+<a name="128" href="#128">128</a> } <strong>else</strong> {
+<a name="129" href="#129">129</a> setLogImplementation
+<a name="130" href="#130">130</a> (<span class="string">"org.apache.commons.logging.impl.NoOpLog"</span>);
+<a name="131" href="#131">131</a> }
+<a name="132" href="#132">132</a> } <strong>catch</strong> (Throwable t) {
+<a name="133" href="#133">133</a> <strong>try</strong> {
+<a name="134" href="#134">134</a> setLogImplementation
+<a name="135" href="#135">135</a> (<span class="string">"org.apache.commons.logging.impl.NoOpLog"</span>);
+<a name="136" href="#136">136</a> } <strong>catch</strong> (Throwable u) {
+<a name="137" href="#137">137</a> ;
+<a name="138" href="#138">138</a> }
+<a name="139" href="#139">139</a> }
+<a name="140" href="#140">140</a> }
+<a name="141" href="#141">141</a>
+<a name="142" href="#142">142</a> }
+<a name="143" href="#143">143</a>
+<a name="144" href="#144">144</a>
+<a name="145" href="#145">145</a> <em class="comment">// ------------------------------------------------------------ Constructor</em>
+<a name="146" href="#146">146</a>
+<a name="147" href="#147">147</a>
+<a name="148" href="#148">148</a> <em>/**<em>* Don't allow others to create instances */</em></em>
+<a name="149" href="#149">149</a> <strong>private</strong> <a href="../../../../org/apache/commons/logging/LogSource.html">LogSource</a>() {
+<a name="150" href="#150">150</a> }
+<a name="151" href="#151">151</a>
+<a name="152" href="#152">152</a>
+<a name="153" href="#153">153</a> <em class="comment">// ---------------------------------------------------------- Class Methods</em>
+<a name="154" href="#154">154</a>
+<a name="155" href="#155">155</a>
+<a name="156" href="#156">156</a> <em>/**<em>*</em></em>
+<a name="157" href="#157">157</a> <em> * Set the log implementation/log implementation factory</em>
+<a name="158" href="#158">158</a> <em> * by the name of the class. The given class</em>
+<a name="159" href="#159">159</a> <em> * must implement {@link Log}, and provide a constructor that</em>
+<a name="160" href="#160">160</a> <em> * takes a single {@link String} argument (containing the name</em>
+<a name="161" href="#161">161</a> <em> * of the log).</em>
+<a name="162" href="#162">162</a> <em> */</em>
+<a name="163" href="#163">163</a> <strong>static</strong> <strong>public</strong> <strong>void</strong> setLogImplementation(String classname) throws
+<a name="164" href="#164">164</a> LinkageError, ExceptionInInitializerError,
+<a name="165" href="#165">165</a> NoSuchMethodException, SecurityException,
+<a name="166" href="#166">166</a> ClassNotFoundException {
+<a name="167" href="#167">167</a> <strong>try</strong> {
+<a name="168" href="#168">168</a> Class logclass = Class.forName(classname);
+<a name="169" href="#169">169</a> Class[] argtypes = <strong>new</strong> Class[1];
+<a name="170" href="#170">170</a> argtypes[0] = <span class="string">""</span>.getClass();
+<a name="171" href="#171">171</a> logImplctor = logclass.getConstructor(argtypes);
+<a name="172" href="#172">172</a> } <strong>catch</strong> (Throwable t) {
+<a name="173" href="#173">173</a> logImplctor = <strong>null</strong>;
+<a name="174" href="#174">174</a> }
+<a name="175" href="#175">175</a> }
+<a name="176" href="#176">176</a>
+<a name="177" href="#177">177</a>
+<a name="178" href="#178">178</a> <em>/**<em>*</em></em>
+<a name="179" href="#179">179</a> <em> * Set the log implementation/log implementation factory</em>
+<a name="180" href="#180">180</a> <em> * by class. The given class must implement {@link Log},</em>
+<a name="181" href="#181">181</a> <em> * and provide a constructor that takes a single {@link String}</em>
+<a name="182" href="#182">182</a> <em> * argument (containing the name of the log).</em>
+<a name="183" href="#183">183</a> <em> */</em>
+<a name="184" href="#184">184</a> <strong>static</strong> <strong>public</strong> <strong>void</strong> setLogImplementation(Class logclass) throws
+<a name="185" href="#185">185</a> LinkageError, ExceptionInInitializerError,
+<a name="186" href="#186">186</a> NoSuchMethodException, SecurityException {
+<a name="187" href="#187">187</a> Class[] argtypes = <strong>new</strong> Class[1];
+<a name="188" href="#188">188</a> argtypes[0] = <span class="string">""</span>.getClass();
+<a name="189" href="#189">189</a> logImplctor = logclass.getConstructor(argtypes);
+<a name="190" href="#190">190</a> }
+<a name="191" href="#191">191</a>
+<a name="192" href="#192">192</a>
+<a name="193" href="#193">193</a> <em>/**<em>* Get a <code>Log</code> instance by class name */</em></em>
+<a name="194" href="#194">194</a> <strong>static</strong> <strong>public</strong> <a href="../../../../org/apache/commons/logging/Log.html">Log</a> getInstance(String name) {
+<a name="195" href="#195">195</a> <a href="../../../../org/apache/commons/logging/Log.html">Log</a> log = (Log) (logs.get(name));
+<a name="196" href="#196">196</a> <strong>if</strong> (<strong>null</strong> == log) {
+<a name="197" href="#197">197</a> log = makeNewLogInstance(name);
+<a name="198" href="#198">198</a> logs.put(name, log);
+<a name="199" href="#199">199</a> }
+<a name="200" href="#200">200</a> <strong>return</strong> log;
+<a name="201" href="#201">201</a> }
+<a name="202" href="#202">202</a>
+<a name="203" href="#203">203</a>
+<a name="204" href="#204">204</a> <em>/**<em>* Get a <code>Log</code> instance by class */</em></em>
+<a name="205" href="#205">205</a> <strong>static</strong> <strong>public</strong> <a href="../../../../org/apache/commons/logging/Log.html">Log</a> getInstance(Class clazz) {
+<a name="206" href="#206">206</a> <strong>return</strong> getInstance(clazz.getName());
+<a name="207" href="#207">207</a> }
+<a name="208" href="#208">208</a>
+<a name="209" href="#209">209</a>
+<a name="210" href="#210">210</a> <em>/**<em>*</em></em>
+<a name="211" href="#211">211</a> <em> * Create a new {@link Log} implementation, based</em>
+<a name="212" href="#212">212</a> <em> * on the given <i>name</i>.</em>
+<a name="213" href="#213">213</a> <em> * <p></em>
+<a name="214" href="#214">214</a> <em> * The specific {@link Log} implementation returned</em>
+<a name="215" href="#215">215</a> <em> * is determined by the value of the</em>
+<a name="216" href="#216">216</a> <em> * <tt>org.apache.commons.logging.log</tt> property.</em>
+<a name="217" href="#217">217</a> <em> * The value of <tt>org.apache.commons.logging.log</tt> may be set to</em>
+<a name="218" href="#218">218</a> <em> * the fully specified name of a class that implements</em>
+<a name="219" href="#219">219</a> <em> * the {@link Log} interface. This class must also</em>
+<a name="220" href="#220">220</a> <em> * have a public constructor that takes a single</em>
+<a name="221" href="#221">221</a> <em> * {@link String} argument (containing the <i>name</i></em>
+<a name="222" href="#222">222</a> <em> * of the {@link Log} to be constructed.</em>
+<a name="223" href="#223">223</a> <em> * <p></em>
+<a name="224" href="#224">224</a> <em> * When <tt>org.apache.commons.logging.log</tt> is not set,</em>
+<a name="225" href="#225">225</a> <em> * or when no corresponding class can be found,</em>
+<a name="226" href="#226">226</a> <em> * this method will return a Log4JLogger</em>
+<a name="227" href="#227">227</a> <em> * if the log4j Logger class is</em>
+<a name="228" href="#228">228</a> <em> * available in the {@link LogSource}'s classpath, or a</em>
+<a name="229" href="#229">229</a> <em> * Jdk14Logger if we are on a JDK 1.4 or later system, or</em>
+<a name="230" href="#230">230</a> <em> * NoOpLog if neither of the above conditions is true.</em>
+<a name="231" href="#231">231</a> <em> *</em>
+<a name="232" href="#232">232</a> <em> * @param name the log name (or category)</em>
+<a name="233" href="#233">233</a> <em> */</em>
+<a name="234" href="#234">234</a> <strong>static</strong> <strong>public</strong> <a href="../../../../org/apache/commons/logging/Log.html">Log</a> makeNewLogInstance(String name) {
+<a name="235" href="#235">235</a>
+<a name="236" href="#236">236</a> <a href="../../../../org/apache/commons/logging/Log.html">Log</a> log = <strong>null</strong>;
+<a name="237" href="#237">237</a> <strong>try</strong> {
+<a name="238" href="#238">238</a> Object[] args = <strong>new</strong> Object[1];
+<a name="239" href="#239">239</a> args[0] = name;
+<a name="240" href="#240">240</a> log = (Log) (logImplctor.newInstance(args));
+<a name="241" href="#241">241</a> } <strong>catch</strong> (Throwable t) {
+<a name="242" href="#242">242</a> log = <strong>null</strong>;
+<a name="243" href="#243">243</a> }
+<a name="244" href="#244">244</a> <strong>if</strong> (<strong>null</strong> == log) {
+<a name="245" href="#245">245</a> log = <strong>new</strong> <a href="../../../../org/apache/commons/logging/impl/NoOpLog.html">NoOpLog</a>(name);
+<a name="246" href="#246">246</a> }
+<a name="247" href="#247">247</a> <strong>return</strong> log;
+<a name="248" href="#248">248</a>
+<a name="249" href="#249">249</a> }
+<a name="250" href="#250">250</a>
+<a name="251" href="#251">251</a>
+<a name="252" href="#252">252</a> <em>/**<em>*</em></em>
+<a name="253" href="#253">253</a> <em> * Returns a {@link String} array containing the names of</em>
+<a name="254" href="#254">254</a> <em> * all logs known to me.</em>
+<a name="255" href="#255">255</a> <em> */</em>
+<a name="256" href="#256">256</a> <strong>static</strong> <strong>public</strong> String[] getLogNames() {
+<a name="257" href="#257">257</a> <strong>return</strong> (String[]) (logs.keySet().toArray(<strong>new</strong> String[logs.size()]));
+<a name="258" href="#258">258</a> }
+<a name="259" href="#259">259</a>
+<a name="260" href="#260">260</a>
+<a name="261" href="#261">261</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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