blob: b4ecef5145d47eafa47e3ea74e195baf292f3942 [file] [log] [blame]
<!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>URLResourceLoader xref</title>
<link type="text/css" rel="stylesheet" href="../../../../../../stylesheet.css" />
</head>
<body>
<div id="overview"><a href="../../../../../../../apidocs/org/apache/velocity/runtime/resource/loader/URLResourceLoader.html">View Javadoc</a></div><pre>
<a name="1" href="#1">1</a> <strong class="jxr_keyword">package</strong> org.apache.velocity.runtime.resource.loader;
<a name="2" href="#2">2</a>
<a name="3" href="#3">3</a> <em class="jxr_comment">/*</em>
<a name="4" href="#4">4</a> <em class="jxr_comment"> * Licensed to the Apache Software Foundation (ASF) under one</em>
<a name="5" href="#5">5</a> <em class="jxr_comment"> * or more contributor license agreements. See the NOTICE file</em>
<a name="6" href="#6">6</a> <em class="jxr_comment"> * distributed with this work for additional information</em>
<a name="7" href="#7">7</a> <em class="jxr_comment"> * regarding copyright ownership. The ASF licenses this file</em>
<a name="8" href="#8">8</a> <em class="jxr_comment"> * to you under the Apache License, Version 2.0 (the</em>
<a name="9" href="#9">9</a> <em class="jxr_comment"> * "License"); you may not use this file except in compliance</em>
<a name="10" href="#10">10</a> <em class="jxr_comment"> * with the License. You may obtain a copy of the License at</em>
<a name="11" href="#11">11</a> <em class="jxr_comment"> *</em>
<a name="12" href="#12">12</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="13" href="#13">13</a> <em class="jxr_comment"> *</em>
<a name="14" href="#14">14</a> <em class="jxr_comment"> * Unless required by applicable law or agreed to in writing,</em>
<a name="15" href="#15">15</a> <em class="jxr_comment"> * software distributed under the License is distributed on an</em>
<a name="16" href="#16">16</a> <em class="jxr_comment"> * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY</em>
<a name="17" href="#17">17</a> <em class="jxr_comment"> * KIND, either express or implied. See the License for the</em>
<a name="18" href="#18">18</a> <em class="jxr_comment"> * specific language governing permissions and limitations</em>
<a name="19" href="#19">19</a> <em class="jxr_comment"> * under the License. </em>
<a name="20" href="#20">20</a> <em class="jxr_comment"> */</em>
<a name="21" href="#21">21</a>
<a name="22" href="#22">22</a> <strong class="jxr_keyword">import</strong> java.io.InputStream;
<a name="23" href="#23">23</a> <strong class="jxr_keyword">import</strong> java.io.IOException;
<a name="24" href="#24">24</a> <strong class="jxr_keyword">import</strong> java.lang.reflect.Method;
<a name="25" href="#25">25</a> <strong class="jxr_keyword">import</strong> java.net.URL;
<a name="26" href="#26">26</a> <strong class="jxr_keyword">import</strong> java.net.URLConnection;
<a name="27" href="#27">27</a> <strong class="jxr_keyword">import</strong> java.util.HashMap;
<a name="28" href="#28">28</a> <strong class="jxr_keyword">import</strong> org.apache.commons.collections.ExtendedProperties;
<a name="29" href="#29">29</a> <strong class="jxr_keyword">import</strong> org.apache.commons.lang.StringUtils;
<a name="30" href="#30">30</a> <strong class="jxr_keyword">import</strong> org.apache.velocity.exception.VelocityException;
<a name="31" href="#31">31</a> <strong class="jxr_keyword">import</strong> org.apache.velocity.exception.ResourceNotFoundException;
<a name="32" href="#32">32</a> <strong class="jxr_keyword">import</strong> org.apache.velocity.runtime.resource.Resource;
<a name="33" href="#33">33</a>
<a name="34" href="#34">34</a> <em class="jxr_javadoccomment">/**</em>
<a name="35" href="#35">35</a> <em class="jxr_javadoccomment"> * This is a simple URL-based loader.</em>
<a name="36" href="#36">36</a> <em class="jxr_javadoccomment"> *</em>
<a name="37" href="#37">37</a> <em class="jxr_javadoccomment"> * @author &lt;a href="<a href="mailto:geirm@apache.org" target="alexandria_uri">mailto:geirm@apache.org</a>"&gt;Geir Magnusson Jr.&lt;/a&gt;</em>
<a name="38" href="#38">38</a> <em class="jxr_javadoccomment"> * @author &lt;a href="<a href="mailto:nbubna@apache.org" target="alexandria_uri">mailto:nbubna@apache.org</a>"&gt;Nathan Bubna&lt;/a&gt;</em>
<a name="39" href="#39">39</a> <em class="jxr_javadoccomment"> * @version $Id: URLResourceLoader.java 191743 2005-06-21 23:22:20Z dlr $</em>
<a name="40" href="#40">40</a> <em class="jxr_javadoccomment"> * @since 1.5</em>
<a name="41" href="#41">41</a> <em class="jxr_javadoccomment"> */</em>
<a name="42" href="#42">42</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../../../org/apache/velocity/runtime/resource/loader/URLResourceLoader.html">URLResourceLoader</a> <strong class="jxr_keyword">extends</strong> <a href="../../../../../../org/apache/velocity/runtime/resource/loader/ResourceLoader.html">ResourceLoader</a>
<a name="43" href="#43">43</a> {
<a name="44" href="#44">44</a> <strong class="jxr_keyword">private</strong> String[] roots = <strong class="jxr_keyword">null</strong>;
<a name="45" href="#45">45</a> <strong class="jxr_keyword">protected</strong> HashMap templateRoots = <strong class="jxr_keyword">null</strong>;
<a name="46" href="#46">46</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">int</strong> timeout = -1;
<a name="47" href="#47">47</a> <strong class="jxr_keyword">private</strong> Method[] timeoutMethods;
<a name="48" href="#48">48</a>
<a name="49" href="#49">49</a> <em class="jxr_javadoccomment">/**</em>
<a name="50" href="#50">50</a> <em class="jxr_javadoccomment"> * @see org.apache.velocity.runtime.resource.loader.ResourceLoader#init(org.apache.commons.collections.ExtendedProperties)</em>
<a name="51" href="#51">51</a> <em class="jxr_javadoccomment"> */</em>
<a name="52" href="#52">52</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> init(ExtendedProperties configuration)
<a name="53" href="#53">53</a> {
<a name="54" href="#54">54</a> log.trace(<span class="jxr_string">"URLResourceLoader : initialization starting."</span>);
<a name="55" href="#55">55</a>
<a name="56" href="#56">56</a> roots = configuration.getStringArray(<span class="jxr_string">"root"</span>);
<a name="57" href="#57">57</a> <strong class="jxr_keyword">if</strong> (log.isDebugEnabled())
<a name="58" href="#58">58</a> {
<a name="59" href="#59">59</a> <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i=0; i &lt; roots.length; i++)
<a name="60" href="#60">60</a> {
<a name="61" href="#61">61</a> log.debug(<span class="jxr_string">"URLResourceLoader : adding root '"</span> + roots[i] + <span class="jxr_string">"'"</span>);
<a name="62" href="#62">62</a> }
<a name="63" href="#63">63</a> }
<a name="64" href="#64">64</a>
<a name="65" href="#65">65</a> timeout = configuration.getInt(<span class="jxr_string">"timeout"</span>, -1);
<a name="66" href="#66">66</a> <strong class="jxr_keyword">if</strong> (timeout &gt; 0)
<a name="67" href="#67">67</a> {
<a name="68" href="#68">68</a> <strong class="jxr_keyword">try</strong>
<a name="69" href="#69">69</a> {
<a name="70" href="#70">70</a> Class[] types = <strong class="jxr_keyword">new</strong> Class[] { Integer.TYPE };
<a name="71" href="#71">71</a> Method conn = URLConnection.<strong class="jxr_keyword">class</strong>.getMethod(<span class="jxr_string">"setConnectTimeout"</span>, types);
<a name="72" href="#72">72</a> Method read = URLConnection.<strong class="jxr_keyword">class</strong>.getMethod(<span class="jxr_string">"setReadTimeout"</span>, types);
<a name="73" href="#73">73</a> timeoutMethods = <strong class="jxr_keyword">new</strong> Method[] { conn, read };
<a name="74" href="#74">74</a> log.debug(<span class="jxr_string">"URLResourceLoader : timeout set to "</span>+timeout);
<a name="75" href="#75">75</a> }
<a name="76" href="#76">76</a> <strong class="jxr_keyword">catch</strong> (NoSuchMethodException nsme)
<a name="77" href="#77">77</a> {
<a name="78" href="#78">78</a> log.debug(<span class="jxr_string">"URLResourceLoader : Java 1.5+ is required to customize timeout!"</span>, nsme);
<a name="79" href="#79">79</a> timeout = -1;
<a name="80" href="#80">80</a> }
<a name="81" href="#81">81</a> }
<a name="82" href="#82">82</a>
<a name="83" href="#83">83</a> <em class="jxr_comment">// init the template paths map</em>
<a name="84" href="#84">84</a> templateRoots = <strong class="jxr_keyword">new</strong> HashMap();
<a name="85" href="#85">85</a>
<a name="86" href="#86">86</a> log.trace(<span class="jxr_string">"URLResourceLoader : initialization complete."</span>);
<a name="87" href="#87">87</a> }
<a name="88" href="#88">88</a>
<a name="89" href="#89">89</a> <em class="jxr_javadoccomment">/**</em>
<a name="90" href="#90">90</a> <em class="jxr_javadoccomment"> * Get an InputStream so that the Runtime can build a</em>
<a name="91" href="#91">91</a> <em class="jxr_javadoccomment"> * template with it.</em>
<a name="92" href="#92">92</a> <em class="jxr_javadoccomment"> *</em>
<a name="93" href="#93">93</a> <em class="jxr_javadoccomment"> * @param name name of template to fetch bytestream of</em>
<a name="94" href="#94">94</a> <em class="jxr_javadoccomment"> * @return InputStream containing the template</em>
<a name="95" href="#95">95</a> <em class="jxr_javadoccomment"> * @throws ResourceNotFoundException if template not found</em>
<a name="96" href="#96">96</a> <em class="jxr_javadoccomment"> * in the file template path.</em>
<a name="97" href="#97">97</a> <em class="jxr_javadoccomment"> */</em>
<a name="98" href="#98">98</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">synchronized</strong> InputStream getResourceStream(String name)
<a name="99" href="#99">99</a> <strong class="jxr_keyword">throws</strong> <a href="../../../../../../org/apache/velocity/exception/ResourceNotFoundException.html">ResourceNotFoundException</a>
<a name="100" href="#100">100</a> {
<a name="101" href="#101">101</a> <strong class="jxr_keyword">if</strong> (StringUtils.isEmpty(name))
<a name="102" href="#102">102</a> {
<a name="103" href="#103">103</a> <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> <a href="../../../../../../org/apache/velocity/exception/ResourceNotFoundException.html">ResourceNotFoundException</a>(<span class="jxr_string">"URLResourceLoader : No template name provided"</span>);
<a name="104" href="#104">104</a> }
<a name="105" href="#105">105</a>
<a name="106" href="#106">106</a> InputStream inputStream = <strong class="jxr_keyword">null</strong>;
<a name="107" href="#107">107</a> Exception exception = <strong class="jxr_keyword">null</strong>;
<a name="108" href="#108">108</a> <strong class="jxr_keyword">for</strong>(<strong class="jxr_keyword">int</strong> i=0; i &lt; roots.length; i++)
<a name="109" href="#109">109</a> {
<a name="110" href="#110">110</a> <strong class="jxr_keyword">try</strong>
<a name="111" href="#111">111</a> {
<a name="112" href="#112">112</a> URL u = <strong class="jxr_keyword">new</strong> URL(roots[i] + name);
<a name="113" href="#113">113</a> URLConnection conn = u.openConnection();
<a name="114" href="#114">114</a> tryToSetTimeout(conn);
<a name="115" href="#115">115</a> inputStream = conn.getInputStream();
<a name="116" href="#116">116</a>
<a name="117" href="#117">117</a> <strong class="jxr_keyword">if</strong> (inputStream != <strong class="jxr_keyword">null</strong>)
<a name="118" href="#118">118</a> {
<a name="119" href="#119">119</a> <strong class="jxr_keyword">if</strong> (log.isDebugEnabled()) log.debug(<span class="jxr_string">"URLResourceLoader: Found '"</span>+name+<span class="jxr_string">"' at '"</span>+roots[i]+<span class="jxr_string">"'"</span>);
<a name="120" href="#120">120</a>
<a name="121" href="#121">121</a> <em class="jxr_comment">// save this root for later re-use</em>
<a name="122" href="#122">122</a> templateRoots.put(name, roots[i]);
<a name="123" href="#123">123</a> <strong class="jxr_keyword">break</strong>;
<a name="124" href="#124">124</a> }
<a name="125" href="#125">125</a> }
<a name="126" href="#126">126</a> <strong class="jxr_keyword">catch</strong>(IOException ioe)
<a name="127" href="#127">127</a> {
<a name="128" href="#128">128</a> <strong class="jxr_keyword">if</strong> (log.isDebugEnabled()) log.debug(<span class="jxr_string">"URLResourceLoader: Exception when looking for '"</span>+name+<span class="jxr_string">"' at '"</span>+roots[i]+<span class="jxr_string">"'"</span>, ioe);
<a name="129" href="#129">129</a>
<a name="130" href="#130">130</a> <em class="jxr_comment">// only save the first one for later throwing</em>
<a name="131" href="#131">131</a> <strong class="jxr_keyword">if</strong> (exception == <strong class="jxr_keyword">null</strong>)
<a name="132" href="#132">132</a> {
<a name="133" href="#133">133</a> exception = ioe;
<a name="134" href="#134">134</a> }
<a name="135" href="#135">135</a> }
<a name="136" href="#136">136</a> }
<a name="137" href="#137">137</a>
<a name="138" href="#138">138</a> <em class="jxr_comment">// if we never found the template</em>
<a name="139" href="#139">139</a> <strong class="jxr_keyword">if</strong> (inputStream == <strong class="jxr_keyword">null</strong>)
<a name="140" href="#140">140</a> {
<a name="141" href="#141">141</a> String msg;
<a name="142" href="#142">142</a> <strong class="jxr_keyword">if</strong> (exception == <strong class="jxr_keyword">null</strong>)
<a name="143" href="#143">143</a> {
<a name="144" href="#144">144</a> msg = <span class="jxr_string">"URLResourceLoader : Resource '"</span> + name + <span class="jxr_string">"' not found."</span>;
<a name="145" href="#145">145</a> }
<a name="146" href="#146">146</a> <strong class="jxr_keyword">else</strong>
<a name="147" href="#147">147</a> {
<a name="148" href="#148">148</a> msg = exception.getMessage();
<a name="149" href="#149">149</a> }
<a name="150" href="#150">150</a> <em class="jxr_comment">// convert to a general Velocity ResourceNotFoundException</em>
<a name="151" href="#151">151</a> <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> <a href="../../../../../../org/apache/velocity/exception/ResourceNotFoundException.html">ResourceNotFoundException</a>(msg);
<a name="152" href="#152">152</a> }
<a name="153" href="#153">153</a>
<a name="154" href="#154">154</a> <strong class="jxr_keyword">return</strong> inputStream;
<a name="155" href="#155">155</a> }
<a name="156" href="#156">156</a>
<a name="157" href="#157">157</a> <em class="jxr_javadoccomment">/**</em>
<a name="158" href="#158">158</a> <em class="jxr_javadoccomment"> * Checks to see if a resource has been deleted, moved or modified.</em>
<a name="159" href="#159">159</a> <em class="jxr_javadoccomment"> *</em>
<a name="160" href="#160">160</a> <em class="jxr_javadoccomment"> * @param resource Resource The resource to check for modification</em>
<a name="161" href="#161">161</a> <em class="jxr_javadoccomment"> * @return boolean True if the resource has been modified, moved, or unreachable</em>
<a name="162" href="#162">162</a> <em class="jxr_javadoccomment"> */</em>
<a name="163" href="#163">163</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> isSourceModified(<a href="../../../../../../org/apache/velocity/runtime/resource/Resource.html">Resource</a> resource)
<a name="164" href="#164">164</a> {
<a name="165" href="#165">165</a> <strong class="jxr_keyword">long</strong> fileLastModified = getLastModified(resource);
<a name="166" href="#166">166</a> <em class="jxr_comment">// if the file is unreachable or otherwise changed</em>
<a name="167" href="#167">167</a> <strong class="jxr_keyword">if</strong> (fileLastModified == 0 ||
<a name="168" href="#168">168</a> fileLastModified != resource.getLastModified())
<a name="169" href="#169">169</a> {
<a name="170" href="#170">170</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">true</strong>;
<a name="171" href="#171">171</a> }
<a name="172" href="#172">172</a> <strong class="jxr_keyword">return</strong> false;
<a name="173" href="#173">173</a> }
<a name="174" href="#174">174</a>
<a name="175" href="#175">175</a> <em class="jxr_javadoccomment">/**</em>
<a name="176" href="#176">176</a> <em class="jxr_javadoccomment"> * Checks to see when a resource was last modified</em>
<a name="177" href="#177">177</a> <em class="jxr_javadoccomment"> *</em>
<a name="178" href="#178">178</a> <em class="jxr_javadoccomment"> * @param resource Resource the resource to check</em>
<a name="179" href="#179">179</a> <em class="jxr_javadoccomment"> * @return long The time when the resource was last modified or 0 if the file can't be reached</em>
<a name="180" href="#180">180</a> <em class="jxr_javadoccomment"> */</em>
<a name="181" href="#181">181</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">long</strong> getLastModified(<a href="../../../../../../org/apache/velocity/runtime/resource/Resource.html">Resource</a> resource)
<a name="182" href="#182">182</a> {
<a name="183" href="#183">183</a> <em class="jxr_comment">// get the previously used root</em>
<a name="184" href="#184">184</a> String name = resource.getName();
<a name="185" href="#185">185</a> String root = (String)templateRoots.get(name);
<a name="186" href="#186">186</a>
<a name="187" href="#187">187</a> <strong class="jxr_keyword">try</strong>
<a name="188" href="#188">188</a> {
<a name="189" href="#189">189</a> <em class="jxr_comment">// get a connection to the URL</em>
<a name="190" href="#190">190</a> URL u = <strong class="jxr_keyword">new</strong> URL(root + name);
<a name="191" href="#191">191</a> URLConnection conn = u.openConnection();
<a name="192" href="#192">192</a> tryToSetTimeout(conn);
<a name="193" href="#193">193</a> <strong class="jxr_keyword">return</strong> conn.getLastModified();
<a name="194" href="#194">194</a> }
<a name="195" href="#195">195</a> <strong class="jxr_keyword">catch</strong> (IOException ioe)
<a name="196" href="#196">196</a> {
<a name="197" href="#197">197</a> <em class="jxr_comment">// the file is not reachable at its previous address</em>
<a name="198" href="#198">198</a> String msg = <span class="jxr_string">"URLResourceLoader: '"</span>+name+<span class="jxr_string">"' is no longer reachable at '"</span>+root+<span class="jxr_string">"'"</span>;
<a name="199" href="#199">199</a> log.error(msg, ioe);
<a name="200" href="#200">200</a> <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> <a href="../../../../../../org/apache/velocity/exception/ResourceNotFoundException.html">ResourceNotFoundException</a>(msg, ioe);
<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 class="jxr_javadoccomment">/**</em>
<a name="205" href="#205">205</a> <em class="jxr_javadoccomment"> * Returns the current, custom timeout setting. If negative, there is no custom timeout.</em>
<a name="206" href="#206">206</a> <em class="jxr_javadoccomment"> * @since 1.6</em>
<a name="207" href="#207">207</a> <em class="jxr_javadoccomment"> */</em>
<a name="208" href="#208">208</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">int</strong> getTimeout()
<a name="209" href="#209">209</a> {
<a name="210" href="#210">210</a> <strong class="jxr_keyword">return</strong> timeout;
<a name="211" href="#211">211</a> }
<a name="212" href="#212">212</a>
<a name="213" href="#213">213</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">void</strong> tryToSetTimeout(URLConnection conn)
<a name="214" href="#214">214</a> {
<a name="215" href="#215">215</a> <strong class="jxr_keyword">if</strong> (timeout &gt; 0)
<a name="216" href="#216">216</a> {
<a name="217" href="#217">217</a> Object[] arg = <strong class="jxr_keyword">new</strong> Object[] { <strong class="jxr_keyword">new</strong> Integer(timeout) };
<a name="218" href="#218">218</a> <strong class="jxr_keyword">try</strong>
<a name="219" href="#219">219</a> {
<a name="220" href="#220">220</a> timeoutMethods[0].invoke(conn, arg);
<a name="221" href="#221">221</a> timeoutMethods[1].invoke(conn, arg);
<a name="222" href="#222">222</a> }
<a name="223" href="#223">223</a> <strong class="jxr_keyword">catch</strong> (Exception e)
<a name="224" href="#224">224</a> {
<a name="225" href="#225">225</a> String msg = <span class="jxr_string">"Unexpected exception while setting connection timeout for "</span>+conn;
<a name="226" href="#226">226</a> log.error(msg, e);
<a name="227" href="#227">227</a> <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> <a href="../../../../../../org/apache/velocity/exception/VelocityException.html">VelocityException</a>(msg, e);
<a name="228" href="#228">228</a> }
<a name="229" href="#229">229</a> }
<a name="230" href="#230">230</a> }
<a name="231" href="#231">231</a>
<a name="232" href="#232">232</a> }
</pre>
<hr/><div id="footer">This page was automatically generated by <a href="http://maven.apache.org/">Maven</a></div></body>
</html>