propertiesloader.html
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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>PropertiesLoader xref</title><link type="text/css" rel="stylesheet" href="../../../../../stylesheet.css" /></head><body><div id="overview"><a href="../../../../../../apidocs/com/sun/syndication/io/impl/PropertiesLoader.html">View Javadoc</a></div><pre><a name="1" href="#1">1</a> <strong>package</strong> <a href="../../../../../com/sun/syndication/io/impl/package-summary.html">com.sun.syndication.io.impl</a>;<a name="2" href="#2">2</a> <a name="3" href="#3">3</a> <strong>import</strong> java.io.IOException;<a name="4" href="#4">4</a> <strong>import</strong> java.io.InputStream;<a name="5" href="#5">5</a> <strong>import</strong> java.net.URL;<a name="6" href="#6">6</a> <strong>import</strong> java.util.*;<a name="7" href="#7">7</a> <a name="8" href="#8">8</a> <em>/**<em>*</em></em><a name="9" href="#9">9</a> <em> * Properties loader that aggregates a master properties file and several extra properties files,</em><a name="10" href="#10">10</a> <em> * all from the current classpath.</em><a name="11" href="#11">11</a> <em> * <P></em><a name="12" href="#12">12</a> <em> * The master properties file has to be in a distinct location than the extra properties files.</em><a name="13" href="#13">13</a> <em> * First the master properties file is loaded, then all the extra properties files in their order</em><a name="14" href="#14">14</a> <em> * of appearance in the classpath.</em><a name="15" href="#15">15</a> <em> * <P></em><a name="16" href="#16">16</a> <em> * Current use cases (plugin manager for parsers/converters/generators for feeds and modules</em><a name="17" href="#17">17</a> <em> * and date formats) assume properties are list of tokens, that why the only method to get</em><a name="18" href="#18">18</a> <em> * property values is the getTokenizedProperty().</em><a name="19" href="#19">19</a> <em> * <p></em><a name="20" href="#20">20</a> <em> *</em><a name="21" href="#21">21</a> <em> * @author Alejandro Abdelnur</em><a name="22" href="#22">22</a> <em> *</em><a name="23" href="#23">23</a> <em> */</em><a name="24" href="#24">24</a> <strong>public</strong> <strong>class</strong> <a href="../../../../../com/sun/syndication/io/impl/PropertiesLoader.html">PropertiesLoader</a> {<a name="25" href="#25">25</a> <a name="26" href="#26">26</a> <strong>private</strong> <strong>static</strong> <strong>final</strong> String MASTER_PLUGIN_FILE = <span class="string">"com/sun/syndication/rome.properties"</span>;<a name="27" href="#27">27</a> <strong>private</strong> <strong>static</strong> <strong>final</strong> String EXTRA_PLUGIN_FILE = <span class="string">"rome.properties"</span>;<a name="28" href="#28">28</a> <a name="29" href="#29">29</a> <a name="30" href="#30">30</a> <strong>private</strong> <strong>static</strong> Map clMap =<a name="31" href="#31">31</a> <strong>new</strong> WeakHashMap();<a name="32" href="#32">32</a> <a name="33" href="#33">33</a> <a name="34" href="#34">34</a> <em>/**<em>*</em></em><a name="35" href="#35">35</a> <em> * Returns the PropertiesLoader singleton used by ROME to load plugin components.</em><a name="36" href="#36">36</a> <em> *</em><a name="37" href="#37">37</a> <em> * @return PropertiesLoader singleton.</em><a name="38" href="#38">38</a> <em> *</em><a name="39" href="#39">39</a> <em> */</em><a name="40" href="#40">40</a> <strong>public</strong> <strong>static</strong> <a href="../../../../../com/sun/syndication/io/impl/PropertiesLoader.html">PropertiesLoader</a> getPropertiesLoader() {<a name="41" href="#41">41</a> <strong>synchronized</strong>(PropertiesLoader.<strong>class</strong>) {<a name="42" href="#42">42</a> <a href="../../../../../com/sun/syndication/io/impl/PropertiesLoader.html">PropertiesLoader</a> loader = (PropertiesLoader)<a name="43" href="#43">43</a> clMap.get(Thread.currentThread().getContextClassLoader());<a name="44" href="#44">44</a> <strong>if</strong> (loader == <strong>null</strong>) {<a name="45" href="#45">45</a> <strong>try</strong> {<a name="46" href="#46">46</a> loader = <strong>new</strong> <a href="../../../../../com/sun/syndication/io/impl/PropertiesLoader.html">PropertiesLoader</a>(MASTER_PLUGIN_FILE, EXTRA_PLUGIN_FILE);<a name="47" href="#47">47</a> clMap.put(Thread.currentThread().getContextClassLoader(), loader);<a name="48" href="#48">48</a> }<a name="49" href="#49">49</a> <strong>catch</strong> (IOException ex) {<a name="50" href="#50">50</a> <strong>throw</strong> <strong>new</strong> RuntimeException(ex);<a name="51" href="#51">51</a> }<a name="52" href="#52">52</a> }<a name="53" href="#53">53</a> <strong>return</strong> loader;<a name="54" href="#54">54</a> }<a name="55" href="#55">55</a> }<a name="56" href="#56">56</a> <a name="57" href="#57">57</a> <strong>private</strong> Properties[] _properties;<a name="58" href="#58">58</a> <a name="59" href="#59">59</a> <em>/**<em>*</em></em><a name="60" href="#60">60</a> <em> * Creates a PropertiesLoader.</em><a name="61" href="#61">61</a> <em> * <p></em><a name="62" href="#62">62</a> <em> * @param masterFileLocation master file location, there must be only one.</em><a name="63" href="#63">63</a> <em> * @param extraFileLocation extra file location, there may be many.</em><a name="64" href="#64">64</a> <em> * @throws IOException thrown if one of the properties file could not be read.</em><a name="65" href="#65">65</a> <em> *</em><a name="66" href="#66">66</a> <em> */</em><a name="67" href="#67">67</a> <strong>private</strong> <a href="../../../../../com/sun/syndication/io/impl/PropertiesLoader.html">PropertiesLoader</a>(String masterFileLocation,String extraFileLocation) throws IOException {<a name="68" href="#68">68</a> List propertiesList = <strong>new</strong> ArrayList();<a name="69" href="#69">69</a> ClassLoader classLoader = Thread.currentThread().getContextClassLoader();<a name="70" href="#70">70</a> <a name="71" href="#71">71</a> <strong>try</strong> {<a name="72" href="#72">72</a> InputStream is = classLoader.getResourceAsStream(masterFileLocation);<a name="73" href="#73">73</a> Properties p = <strong>new</strong> Properties();<a name="74" href="#74">74</a> p.load(is);<a name="75" href="#75">75</a> is.close();<a name="76" href="#76">76</a> propertiesList.add(p);<a name="77" href="#77">77</a> }<a name="78" href="#78">78</a> <strong>catch</strong> (IOException ioex) {<a name="79" href="#79">79</a> IOException ex = <strong>new</strong> IOException(<span class="string">"could not load ROME master plugins file ["</span>+masterFileLocation+<span class="string">"], "</span>+<a name="80" href="#80">80</a> ioex.getMessage());<a name="81" href="#81">81</a> ex.setStackTrace(ioex.getStackTrace());<a name="82" href="#82">82</a> <strong>throw</strong> ex;<a name="83" href="#83">83</a> }<a name="84" href="#84">84</a> <a name="85" href="#85">85</a> Enumeration urls = classLoader.getResources(extraFileLocation);<a name="86" href="#86">86</a> <strong>while</strong> (urls.hasMoreElements()) {<a name="87" href="#87">87</a> URL url = (URL) urls.nextElement();<a name="88" href="#88">88</a> Properties p = <strong>new</strong> Properties();<a name="89" href="#89">89</a> <strong>try</strong> {<a name="90" href="#90">90</a> InputStream is = url.openStream();<a name="91" href="#91">91</a> p.load(is);<a name="92" href="#92">92</a> is.close();<a name="93" href="#93">93</a> }<a name="94" href="#94">94</a> <strong>catch</strong> (IOException ioex) {<a name="95" href="#95">95</a> IOException ex = <strong>new</strong> IOException(<span class="string">"could not load ROME extensions plugins file ["</span>+url.toString()+<span class="string">"], "</span>+<a name="96" href="#96">96</a> ioex.getMessage());<a name="97" href="#97">97</a> ex.setStackTrace(ioex.getStackTrace());<a name="98" href="#98">98</a> <strong>throw</strong> ex;<a name="99" href="#99">99</a> }<a name="100" href="#100">100</a> propertiesList.add(p);<a name="101" href="#101">101</a> }<a name="102" href="#102">102</a> <a name="103" href="#103">103</a> _properties = <strong>new</strong> Properties[propertiesList.size()];<a name="104" href="#104">104</a> propertiesList.toArray(_properties);<a name="105" href="#105">105</a> }<a name="106" href="#106">106</a> <a name="107" href="#107">107</a> <em>/**<em>*</em></em><a name="108" href="#108">108</a> <em> * Returns an array of tokenized values stored under a property key in all properties files.</em><a name="109" href="#109">109</a> <em> * If the master file has this property its tokens will be the first ones in the array.</em><a name="110" href="#110">110</a> <em> * <p></em><a name="111" href="#111">111</a> <em> * @param key property key to retrieve values</em><a name="112" href="#112">112</a> <em> * @param separator String with all separator characters to tokenize from the values in all</em><a name="113" href="#113">113</a> <em> * properties files.</em><a name="114" href="#114">114</a> <em> * @return all the tokens for the given property key from all the properties files.</em><a name="115" href="#115">115</a> <em> *</em><a name="116" href="#116">116</a> <em> */</em><a name="117" href="#117">117</a> <strong>public</strong> String[] getTokenizedProperty(String key,String separator) {<a name="118" href="#118">118</a> List entriesList = <strong>new</strong> ArrayList();<a name="119" href="#119">119</a> <strong>for</strong> (<strong>int</strong> i=0;i<_properties.length;i++) {<a name="120" href="#120">120</a> String values = _properties[i].getProperty(key);<a name="121" href="#121">121</a> <strong>if</strong> (values!=<strong>null</strong>) {<a name="122" href="#122">122</a> StringTokenizer st = <strong>new</strong> StringTokenizer(values,separator);<a name="123" href="#123">123</a> <strong>while</strong> (st.hasMoreTokens()) {<a name="124" href="#124">124</a> String token = st.nextToken();<a name="125" href="#125">125</a> entriesList.add(token);<a name="126" href="#126">126</a> }<a name="127" href="#127">127</a> }<a name="128" href="#128">128</a> }<a name="129" href="#129">129</a> String[] entries = <strong>new</strong> String[entriesList.size()];<a name="130" href="#130">130</a> entriesList.toArray(entries);<a name="131" href="#131">131</a> <strong>return</strong> entries;<a name="132" href="#132">132</a> }<a name="133" href="#133">133</a> <a name="134" href="#134">134</a> <em>/**<em>*</em></em><a name="135" href="#135">135</a> <em> * Returns an array of values stored under a property key in all properties files.</em><a name="136" href="#136">136</a> <em> * If the master file has this property it will be the first ones in the array.</em><a name="137" href="#137">137</a> <em> * <p></em><a name="138" href="#138">138</a> <em> * @param key property key to retrieve values</em><a name="139" href="#139">139</a> <em> * @return all the values for the given property key from all the properties files.</em><a name="140" href="#140">140</a> <em> *</em><a name="141" href="#141">141</a> <em> */</em><a name="142" href="#142">142</a> <strong>public</strong> String[] getProperty(String key) {<a name="143" href="#143">143</a> List entriesList = <strong>new</strong> ArrayList();<a name="144" href="#144">144</a> <strong>for</strong> (<strong>int</strong> i=0;i<_properties.length;i++) {<a name="145" href="#145">145</a> String values = _properties[i].getProperty(key);<a name="146" href="#146">146</a> <strong>if</strong> (values!=<strong>null</strong>) {<a name="147" href="#147">147</a> entriesList.add(values);<a name="148" href="#148">148</a> }<a name="149" href="#149">149</a> }<a name="150" href="#150">150</a> String[] entries = <strong>new</strong> String[entriesList.size()];<a name="151" href="#151">151</a> entriesList.toArray(entries);<a name="152" href="#152">152</a> <strong>return</strong> entries;<a name="153" href="#153">153</a> }<a name="154" href="#154">154</a> <a name="155" href="#155">155</a> }</pre><hr/><div id="footer">This page was automatically generated by <a href="http://maven.apache.org/">Maven</a></div></body></html>⌨️ 快捷键说明
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