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| <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.net.URL; |
| <a name="25" href="#25">25</a> <strong class="jxr_keyword">import</strong> java.net.URLConnection; |
| <a name="26" href="#26">26</a> <strong class="jxr_keyword">import</strong> java.util.HashMap; |
| <a name="27" href="#27">27</a> <strong class="jxr_keyword">import</strong> org.apache.commons.collections.ExtendedProperties; |
| <a name="28" href="#28">28</a> <strong class="jxr_keyword">import</strong> org.apache.commons.lang.StringUtils; |
| <a name="29" href="#29">29</a> <strong class="jxr_keyword">import</strong> org.apache.velocity.exception.ResourceNotFoundException; |
| <a name="30" href="#30">30</a> <strong class="jxr_keyword">import</strong> org.apache.velocity.runtime.resource.Resource; |
| <a name="31" href="#31">31</a> |
| <a name="32" href="#32">32</a> <em class="jxr_javadoccomment">/**</em> |
| <a name="33" href="#33">33</a> <em class="jxr_javadoccomment"> * This is a simple URL-based loader.</em> |
| <a name="34" href="#34">34</a> <em class="jxr_javadoccomment"> *</em> |
| <a name="35" href="#35">35</a> <em class="jxr_javadoccomment"> * @author <a href="<a href="mailto:geirm@apache.org" target="alexandria_uri">mailto:geirm@apache.org</a>">Geir Magnusson Jr.</a></em> |
| <a name="36" href="#36">36</a> <em class="jxr_javadoccomment"> * @author <a href="<a href="mailto:nbubna@apache.org" target="alexandria_uri">mailto:nbubna@apache.org</a>">Nathan Bubna</a></em> |
| <a name="37" href="#37">37</a> <em class="jxr_javadoccomment"> * @version $Id: URLResourceLoader.java 191743 2005-06-21 23:22:20Z dlr $</em> |
| <a name="38" href="#38">38</a> <em class="jxr_javadoccomment"> */</em> |
| <a name="39" href="#39">39</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="40" href="#40">40</a> { |
| <a name="41" href="#41">41</a> <strong class="jxr_keyword">private</strong> String[] roots = <strong class="jxr_keyword">null</strong>; |
| <a name="42" href="#42">42</a> <strong class="jxr_keyword">protected</strong> HashMap templateRoots = <strong class="jxr_keyword">null</strong>; |
| <a name="43" href="#43">43</a> |
| <a name="44" href="#44">44</a> <em class="jxr_javadoccomment">/**</em> |
| <a name="45" href="#45">45</a> <em class="jxr_javadoccomment"> * @see org.apache.velocity.runtime.resource.loader.ResourceLoader#init(org.apache.commons.collections.ExtendedProperties)</em> |
| <a name="46" href="#46">46</a> <em class="jxr_javadoccomment"> */</em> |
| <a name="47" href="#47">47</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> init(ExtendedProperties configuration) |
| <a name="48" href="#48">48</a> { |
| <a name="49" href="#49">49</a> log.trace(<span class="jxr_string">"URLResourceLoader : initialization starting."</span>); |
| <a name="50" href="#50">50</a> |
| <a name="51" href="#51">51</a> roots = configuration.getStringArray(<span class="jxr_string">"root"</span>); |
| <a name="52" href="#52">52</a> |
| <a name="53" href="#53">53</a> <strong class="jxr_keyword">if</strong> (log.isInfoEnabled()) |
| <a name="54" href="#54">54</a> { |
| <a name="55" href="#55">55</a> <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i=0; i < roots.length; i++) |
| <a name="56" href="#56">56</a> { |
| <a name="57" href="#57">57</a> log.info(<span class="jxr_string">"URLResourceLoader : adding root '"</span> + roots[i] + <span class="jxr_string">"'"</span>); |
| <a name="58" href="#58">58</a> } |
| <a name="59" href="#59">59</a> } |
| <a name="60" href="#60">60</a> |
| <a name="61" href="#61">61</a> <em class="jxr_comment">// init the template paths map</em> |
| <a name="62" href="#62">62</a> templateRoots = <strong class="jxr_keyword">new</strong> HashMap(); |
| <a name="63" href="#63">63</a> |
| <a name="64" href="#64">64</a> log.trace(<span class="jxr_string">"URLResourceLoader : initialization complete."</span>); |
| <a name="65" href="#65">65</a> } |
| <a name="66" href="#66">66</a> |
| <a name="67" href="#67">67</a> <em class="jxr_javadoccomment">/**</em> |
| <a name="68" href="#68">68</a> <em class="jxr_javadoccomment"> * Get an InputStream so that the Runtime can build a</em> |
| <a name="69" href="#69">69</a> <em class="jxr_javadoccomment"> * template with it.</em> |
| <a name="70" href="#70">70</a> <em class="jxr_javadoccomment"> *</em> |
| <a name="71" href="#71">71</a> <em class="jxr_javadoccomment"> * @param name name of template to fetch bytestream of</em> |
| <a name="72" href="#72">72</a> <em class="jxr_javadoccomment"> * @return InputStream containing the template</em> |
| <a name="73" href="#73">73</a> <em class="jxr_javadoccomment"> * @throws ResourceNotFoundException if template not found</em> |
| <a name="74" href="#74">74</a> <em class="jxr_javadoccomment"> * in the file template path.</em> |
| <a name="75" href="#75">75</a> <em class="jxr_javadoccomment"> */</em> |
| <a name="76" href="#76">76</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">synchronized</strong> InputStream getResourceStream(String name) |
| <a name="77" href="#77">77</a> <strong class="jxr_keyword">throws</strong> <a href="../../../../../../org/apache/velocity/exception/ResourceNotFoundException.html">ResourceNotFoundException</a> |
| <a name="78" href="#78">78</a> { |
| <a name="79" href="#79">79</a> <strong class="jxr_keyword">if</strong> (StringUtils.isEmpty(name)) |
| <a name="80" href="#80">80</a> { |
| <a name="81" href="#81">81</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="82" href="#82">82</a> } |
| <a name="83" href="#83">83</a> |
| <a name="84" href="#84">84</a> InputStream inputStream = <strong class="jxr_keyword">null</strong>; |
| <a name="85" href="#85">85</a> Exception exception = <strong class="jxr_keyword">null</strong>; |
| <a name="86" href="#86">86</a> <strong class="jxr_keyword">for</strong>(<strong class="jxr_keyword">int</strong> i=0; i < roots.length; i++) |
| <a name="87" href="#87">87</a> { |
| <a name="88" href="#88">88</a> <strong class="jxr_keyword">try</strong> |
| <a name="89" href="#89">89</a> { |
| <a name="90" href="#90">90</a> URL u = <strong class="jxr_keyword">new</strong> URL(roots[i] + name); |
| <a name="91" href="#91">91</a> inputStream = u.openStream(); |
| <a name="92" href="#92">92</a> |
| <a name="93" href="#93">93</a> <strong class="jxr_keyword">if</strong> (inputStream != <strong class="jxr_keyword">null</strong>) |
| <a name="94" href="#94">94</a> { |
| <a name="95" href="#95">95</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="96" href="#96">96</a> |
| <a name="97" href="#97">97</a> <em class="jxr_comment">// save this root for later re-use</em> |
| <a name="98" href="#98">98</a> templateRoots.put(name, roots[i]); |
| <a name="99" href="#99">99</a> <strong class="jxr_keyword">break</strong>; |
| <a name="100" href="#100">100</a> } |
| <a name="101" href="#101">101</a> } |
| <a name="102" href="#102">102</a> <strong class="jxr_keyword">catch</strong>(IOException ioe) |
| <a name="103" href="#103">103</a> { |
| <a name="104" href="#104">104</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="105" href="#105">105</a> |
| <a name="106" href="#106">106</a> <em class="jxr_comment">// only save the first one for later throwing</em> |
| <a name="107" href="#107">107</a> <strong class="jxr_keyword">if</strong> (exception == <strong class="jxr_keyword">null</strong>) |
| <a name="108" href="#108">108</a> { |
| <a name="109" href="#109">109</a> exception = ioe; |
| <a name="110" href="#110">110</a> } |
| <a name="111" href="#111">111</a> } |
| <a name="112" href="#112">112</a> } |
| <a name="113" href="#113">113</a> |
| <a name="114" href="#114">114</a> <em class="jxr_comment">// if we never found the template</em> |
| <a name="115" href="#115">115</a> <strong class="jxr_keyword">if</strong> (inputStream == <strong class="jxr_keyword">null</strong>) |
| <a name="116" href="#116">116</a> { |
| <a name="117" href="#117">117</a> String msg; |
| <a name="118" href="#118">118</a> <strong class="jxr_keyword">if</strong> (exception == <strong class="jxr_keyword">null</strong>) |
| <a name="119" href="#119">119</a> { |
| <a name="120" href="#120">120</a> msg = <span class="jxr_string">"URLResourceLoader : Resource '"</span> + name + <span class="jxr_string">"' not found."</span>; |
| <a name="121" href="#121">121</a> } |
| <a name="122" href="#122">122</a> <strong class="jxr_keyword">else</strong> |
| <a name="123" href="#123">123</a> { |
| <a name="124" href="#124">124</a> msg = exception.getMessage(); |
| <a name="125" href="#125">125</a> } |
| <a name="126" href="#126">126</a> <em class="jxr_comment">// convert to a general Velocity ResourceNotFoundException</em> |
| <a name="127" href="#127">127</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="128" href="#128">128</a> } |
| <a name="129" href="#129">129</a> |
| <a name="130" href="#130">130</a> <strong class="jxr_keyword">return</strong> inputStream; |
| <a name="131" href="#131">131</a> } |
| <a name="132" href="#132">132</a> |
| <a name="133" href="#133">133</a> <em class="jxr_javadoccomment">/**</em> |
| <a name="134" href="#134">134</a> <em class="jxr_javadoccomment"> * Checks to see if a resource has been deleted, moved or modified.</em> |
| <a name="135" href="#135">135</a> <em class="jxr_javadoccomment"> *</em> |
| <a name="136" href="#136">136</a> <em class="jxr_javadoccomment"> * @param resource Resource The resource to check for modification</em> |
| <a name="137" href="#137">137</a> <em class="jxr_javadoccomment"> * @return boolean True if the resource has been modified, moved, or unreachable</em> |
| <a name="138" href="#138">138</a> <em class="jxr_javadoccomment"> */</em> |
| <a name="139" href="#139">139</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="140" href="#140">140</a> { |
| <a name="141" href="#141">141</a> <strong class="jxr_keyword">long</strong> fileLastModified = getLastModified(resource); |
| <a name="142" href="#142">142</a> <em class="jxr_comment">// if the file is unreachable or otherwise changed</em> |
| <a name="143" href="#143">143</a> <strong class="jxr_keyword">if</strong> (fileLastModified == 0 || |
| <a name="144" href="#144">144</a> fileLastModified != resource.getLastModified()) |
| <a name="145" href="#145">145</a> { |
| <a name="146" href="#146">146</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">true</strong>; |
| <a name="147" href="#147">147</a> } |
| <a name="148" href="#148">148</a> <strong class="jxr_keyword">return</strong> false; |
| <a name="149" href="#149">149</a> } |
| <a name="150" href="#150">150</a> |
| <a name="151" href="#151">151</a> <em class="jxr_javadoccomment">/**</em> |
| <a name="152" href="#152">152</a> <em class="jxr_javadoccomment"> * Checks to see when a resource was last modified</em> |
| <a name="153" href="#153">153</a> <em class="jxr_javadoccomment"> *</em> |
| <a name="154" href="#154">154</a> <em class="jxr_javadoccomment"> * @param resource Resource the resource to check</em> |
| <a name="155" href="#155">155</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="156" href="#156">156</a> <em class="jxr_javadoccomment"> */</em> |
| <a name="157" href="#157">157</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="158" href="#158">158</a> { |
| <a name="159" href="#159">159</a> <em class="jxr_comment">// get the previously used root</em> |
| <a name="160" href="#160">160</a> String name = resource.getName(); |
| <a name="161" href="#161">161</a> String root = (String)templateRoots.get(name); |
| <a name="162" href="#162">162</a> |
| <a name="163" href="#163">163</a> <strong class="jxr_keyword">try</strong> |
| <a name="164" href="#164">164</a> { |
| <a name="165" href="#165">165</a> <em class="jxr_comment">// get a connection to the URL</em> |
| <a name="166" href="#166">166</a> URL u = <strong class="jxr_keyword">new</strong> URL(root + name); |
| <a name="167" href="#167">167</a> URLConnection conn = u.openConnection(); |
| <a name="168" href="#168">168</a> <strong class="jxr_keyword">return</strong> conn.getLastModified(); |
| <a name="169" href="#169">169</a> } |
| <a name="170" href="#170">170</a> <strong class="jxr_keyword">catch</strong> (IOException ioe) |
| <a name="171" href="#171">171</a> { |
| <a name="172" href="#172">172</a> <em class="jxr_comment">// the file is not reachable at its previous address</em> |
| <a name="173" href="#173">173</a> log.warn(<span class="jxr_string">"URLResourceLoader: '"</span> + name + |
| <a name="174" href="#174">174</a> <span class="jxr_string">"' is no longer reachable at '"</span> + root + <span class="jxr_string">"'"</span>, ioe); |
| <a name="175" href="#175">175</a> <strong class="jxr_keyword">return</strong> 0; |
| <a name="176" href="#176">176</a> } |
| <a name="177" href="#177">177</a> } |
| <a name="178" href="#178">178</a> |
| <a name="179" href="#179">179</a> } |
| </pre> |
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