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| <a name="1" href="#1">1</a> <strong class="jxr_keyword">package</strong> org.apache.velocity.app; |
| <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.lang.reflect.Field; |
| <a name="23" href="#23">23</a> <strong class="jxr_keyword">import</strong> java.lang.reflect.Modifier; |
| <a name="24" href="#24">24</a> <strong class="jxr_keyword">import</strong> java.util.HashMap; |
| <a name="25" href="#25">25</a> <strong class="jxr_keyword">import</strong> org.apache.velocity.util.ClassUtils; |
| <a name="26" href="#26">26</a> |
| <a name="27" href="#27">27</a> <em class="jxr_javadoccomment">/**</em> |
| <a name="28" href="#28">28</a> <em class="jxr_javadoccomment"> * <p></em> |
| <a name="29" href="#29">29</a> <em class="jxr_javadoccomment"> * This is a small utility class allow easy access to static fields in a class,</em> |
| <a name="30" href="#30">30</a> <em class="jxr_javadoccomment"> * such as string constants. Velocity will not introspect for class</em> |
| <a name="31" href="#31">31</a> <em class="jxr_javadoccomment"> * fields (and won't in the future :), but writing setter/getter methods to do</em> |
| <a name="32" href="#32">32</a> <em class="jxr_javadoccomment"> * this really is a pain, so use this if you really have</em> |
| <a name="33" href="#33">33</a> <em class="jxr_javadoccomment"> * to access fields.</em> |
| <a name="34" href="#34">34</a> <em class="jxr_javadoccomment"> *</em> |
| <a name="35" href="#35">35</a> <em class="jxr_javadoccomment"> * <p></em> |
| <a name="36" href="#36">36</a> <em class="jxr_javadoccomment"> * The idea it so enable access to the fields just like you would in Java.</em> |
| <a name="37" href="#37">37</a> <em class="jxr_javadoccomment"> * For example, in Java, you would access a static field like</em> |
| <a name="38" href="#38">38</a> <em class="jxr_javadoccomment"> * <blockquote><pre></em> |
| <a name="39" href="#39">39</a> <em class="jxr_javadoccomment"> * MyClass.STRING_CONSTANT</em> |
| <a name="40" href="#40">40</a> <em class="jxr_javadoccomment"> * </pre></blockquote></em> |
| <a name="41" href="#41">41</a> <em class="jxr_javadoccomment"> * and that is the same thing we are trying to allow here.</em> |
| <a name="42" href="#42">42</a> <em class="jxr_javadoccomment"> *</em> |
| <a name="43" href="#43">43</a> <em class="jxr_javadoccomment"> * <p></em> |
| <a name="44" href="#44">44</a> <em class="jxr_javadoccomment"> * So to use in your Java code, do something like this :</em> |
| <a name="45" href="#45">45</a> <em class="jxr_javadoccomment"> * <blockquote><pre></em> |
| <a name="46" href="#46">46</a> <em class="jxr_javadoccomment"> * context.put("runtime", new FieldMethodizer( "org.apache.velocity.runtime.Runtime" ));</em> |
| <a name="47" href="#47">47</a> <em class="jxr_javadoccomment"> * </pre></blockquote></em> |
| <a name="48" href="#48">48</a> <em class="jxr_javadoccomment"> * and then in your template, you can access any of your static fields in this way :</em> |
| <a name="49" href="#49">49</a> <em class="jxr_javadoccomment"> * <blockquote><pre></em> |
| <a name="50" href="#50">50</a> <em class="jxr_javadoccomment"> * $runtime.COUNTER_NAME</em> |
| <a name="51" href="#51">51</a> <em class="jxr_javadoccomment"> * </pre></blockquote></em> |
| <a name="52" href="#52">52</a> <em class="jxr_javadoccomment"> *</em> |
| <a name="53" href="#53">53</a> <em class="jxr_javadoccomment"> * <p></em> |
| <a name="54" href="#54">54</a> <em class="jxr_javadoccomment"> * Right now, this class only methodizes <code>public static</code> fields. It seems</em> |
| <a name="55" href="#55">55</a> <em class="jxr_javadoccomment"> * that anything else is too dangerous. This class is for convenience accessing</em> |
| <a name="56" href="#56">56</a> <em class="jxr_javadoccomment"> * 'constants'. If you have fields that aren't <code>static</code> it may be better</em> |
| <a name="57" href="#57">57</a> <em class="jxr_javadoccomment"> * to handle them by explicitly placing them into the context.</em> |
| <a name="58" href="#58">58</a> <em class="jxr_javadoccomment"> *</em> |
| <a name="59" href="#59">59</a> <em class="jxr_javadoccomment"> * @author <a href="<a href="mailto:geirm@optonline.net" target="alexandria_uri">mailto:geirm@optonline.net</a>">Geir Magnusson Jr.</a></em> |
| <a name="60" href="#60">60</a> <em class="jxr_javadoccomment"> * @version $Id: FieldMethodizer.java 463298 2006-10-12 16:10:32Z henning $</em> |
| <a name="61" href="#61">61</a> <em class="jxr_javadoccomment"> */</em> |
| <a name="62" href="#62">62</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../org/apache/velocity/app/FieldMethodizer.html">FieldMethodizer</a> |
| <a name="63" href="#63">63</a> { |
| <a name="64" href="#64">64</a> <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Hold the field objects by field name */</em> |
| <a name="65" href="#65">65</a> <strong class="jxr_keyword">private</strong> HashMap fieldHash = <strong class="jxr_keyword">new</strong> HashMap(); |
| <a name="66" href="#66">66</a> |
| <a name="67" href="#67">67</a> <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Hold the class objects by field name */</em> |
| <a name="68" href="#68">68</a> <strong class="jxr_keyword">private</strong> HashMap classHash = <strong class="jxr_keyword">new</strong> HashMap(); |
| <a name="69" href="#69">69</a> |
| <a name="70" href="#70">70</a> <em class="jxr_javadoccomment">/**</em> |
| <a name="71" href="#71">71</a> <em class="jxr_javadoccomment"> * Allow object to be initialized without any data. You would use</em> |
| <a name="72" href="#72">72</a> <em class="jxr_javadoccomment"> * addObject() to add data later.</em> |
| <a name="73" href="#73">73</a> <em class="jxr_javadoccomment"> */</em> |
| <a name="74" href="#74">74</a> <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/velocity/app/FieldMethodizer.html">FieldMethodizer</a>() |
| <a name="75" href="#75">75</a> { |
| <a name="76" href="#76">76</a> } |
| <a name="77" href="#77">77</a> |
| <a name="78" href="#78">78</a> <em class="jxr_javadoccomment">/**</em> |
| <a name="79" href="#79">79</a> <em class="jxr_javadoccomment"> * Constructor that takes as it's arg the name of the class</em> |
| <a name="80" href="#80">80</a> <em class="jxr_javadoccomment"> * to methodize.</em> |
| <a name="81" href="#81">81</a> <em class="jxr_javadoccomment"> *</em> |
| <a name="82" href="#82">82</a> <em class="jxr_javadoccomment"> * @param s Name of class to methodize.</em> |
| <a name="83" href="#83">83</a> <em class="jxr_javadoccomment"> */</em> |
| <a name="84" href="#84">84</a> <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/velocity/app/FieldMethodizer.html">FieldMethodizer</a>( String s ) |
| <a name="85" href="#85">85</a> { |
| <a name="86" href="#86">86</a> <strong class="jxr_keyword">try</strong> |
| <a name="87" href="#87">87</a> { |
| <a name="88" href="#88">88</a> addObject(s); |
| <a name="89" href="#89">89</a> } |
| <a name="90" href="#90">90</a> <strong class="jxr_keyword">catch</strong>( Exception e ) |
| <a name="91" href="#91">91</a> { |
| <a name="92" href="#92">92</a> System.err.println(<span class="jxr_string">"Could not add "</span> + s |
| <a name="93" href="#93">93</a> + <span class="jxr_string">" for field methodizing: "</span> |
| <a name="94" href="#94">94</a> + e.getMessage()); |
| <a name="95" href="#95">95</a> } |
| <a name="96" href="#96">96</a> } |
| <a name="97" href="#97">97</a> |
| <a name="98" href="#98">98</a> <em class="jxr_javadoccomment">/**</em> |
| <a name="99" href="#99">99</a> <em class="jxr_javadoccomment"> * Constructor that takes as it's arg a living</em> |
| <a name="100" href="#100">100</a> <em class="jxr_javadoccomment"> * object to methodize. Note that it will still</em> |
| <a name="101" href="#101">101</a> <em class="jxr_javadoccomment"> * only methodized the public static fields of</em> |
| <a name="102" href="#102">102</a> <em class="jxr_javadoccomment"> * the class.</em> |
| <a name="103" href="#103">103</a> <em class="jxr_javadoccomment"> *</em> |
| <a name="104" href="#104">104</a> <em class="jxr_javadoccomment"> * @param o Name of class to methodize.</em> |
| <a name="105" href="#105">105</a> <em class="jxr_javadoccomment"> */</em> |
| <a name="106" href="#106">106</a> <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/velocity/app/FieldMethodizer.html">FieldMethodizer</a>( Object o ) |
| <a name="107" href="#107">107</a> { |
| <a name="108" href="#108">108</a> <strong class="jxr_keyword">try</strong> |
| <a name="109" href="#109">109</a> { |
| <a name="110" href="#110">110</a> addObject(o); |
| <a name="111" href="#111">111</a> } |
| <a name="112" href="#112">112</a> <strong class="jxr_keyword">catch</strong>( Exception e ) |
| <a name="113" href="#113">113</a> { |
| <a name="114" href="#114">114</a> System.err.println(<span class="jxr_string">"Could not add "</span> + o |
| <a name="115" href="#115">115</a> + <span class="jxr_string">" for field methodizing: "</span> |
| <a name="116" href="#116">116</a> + e.getMessage()); |
| <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> <em class="jxr_javadoccomment">/**</em> |
| <a name="121" href="#121">121</a> <em class="jxr_javadoccomment"> * Add the Name of the class to methodize</em> |
| <a name="122" href="#122">122</a> <em class="jxr_javadoccomment"> * @param s</em> |
| <a name="123" href="#123">123</a> <em class="jxr_javadoccomment"> * @throws Exception</em> |
| <a name="124" href="#124">124</a> <em class="jxr_javadoccomment"> */</em> |
| <a name="125" href="#125">125</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> addObject ( String s ) |
| <a name="126" href="#126">126</a> <strong class="jxr_keyword">throws</strong> Exception |
| <a name="127" href="#127">127</a> { |
| <a name="128" href="#128">128</a> inspect(ClassUtils.getClass(s)); |
| <a name="129" href="#129">129</a> } |
| <a name="130" href="#130">130</a> |
| <a name="131" href="#131">131</a> <em class="jxr_javadoccomment">/**</em> |
| <a name="132" href="#132">132</a> <em class="jxr_javadoccomment"> * Add an Object to methodize</em> |
| <a name="133" href="#133">133</a> <em class="jxr_javadoccomment"> * @param o</em> |
| <a name="134" href="#134">134</a> <em class="jxr_javadoccomment"> * @throws Exception</em> |
| <a name="135" href="#135">135</a> <em class="jxr_javadoccomment"> */</em> |
| <a name="136" href="#136">136</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> addObject ( Object o ) |
| <a name="137" href="#137">137</a> <strong class="jxr_keyword">throws</strong> Exception |
| <a name="138" href="#138">138</a> { |
| <a name="139" href="#139">139</a> inspect(o.getClass()); |
| <a name="140" href="#140">140</a> } |
| <a name="141" href="#141">141</a> |
| <a name="142" href="#142">142</a> <em class="jxr_javadoccomment">/**</em> |
| <a name="143" href="#143">143</a> <em class="jxr_javadoccomment"> * Accessor method to get the fields by name.</em> |
| <a name="144" href="#144">144</a> <em class="jxr_javadoccomment"> *</em> |
| <a name="145" href="#145">145</a> <em class="jxr_javadoccomment"> * @param fieldName Name of static field to retrieve</em> |
| <a name="146" href="#146">146</a> <em class="jxr_javadoccomment"> *</em> |
| <a name="147" href="#147">147</a> <em class="jxr_javadoccomment"> * @return The value of the given field.</em> |
| <a name="148" href="#148">148</a> <em class="jxr_javadoccomment"> */</em> |
| <a name="149" href="#149">149</a> <strong class="jxr_keyword">public</strong> Object get( String fieldName ) |
| <a name="150" href="#150">150</a> { |
| <a name="151" href="#151">151</a> Object value = <strong class="jxr_keyword">null</strong>; |
| <a name="152" href="#152">152</a> <strong class="jxr_keyword">try</strong> |
| <a name="153" href="#153">153</a> { |
| <a name="154" href="#154">154</a> Field f = (Field) fieldHash.get( fieldName ); |
| <a name="155" href="#155">155</a> <strong class="jxr_keyword">if</strong> (f != <strong class="jxr_keyword">null</strong>) |
| <a name="156" href="#156">156</a> { |
| <a name="157" href="#157">157</a> value = f.get(classHash.get(fieldName) ); |
| <a name="158" href="#158">158</a> } |
| <a name="159" href="#159">159</a> } |
| <a name="160" href="#160">160</a> <strong class="jxr_keyword">catch</strong>( IllegalAccessException e ) |
| <a name="161" href="#161">161</a> { |
| <a name="162" href="#162">162</a> System.err.println(<span class="jxr_string">"IllegalAccessException while trying to access "</span> + fieldName |
| <a name="163" href="#163">163</a> + <span class="jxr_string">": "</span> + e.getMessage()); |
| <a name="164" href="#164">164</a> } |
| <a name="165" href="#165">165</a> <strong class="jxr_keyword">return</strong> value; |
| <a name="166" href="#166">166</a> } |
| <a name="167" href="#167">167</a> |
| <a name="168" href="#168">168</a> <em class="jxr_javadoccomment">/**</em> |
| <a name="169" href="#169">169</a> <em class="jxr_javadoccomment"> * Method that retrieves all public static fields</em> |
| <a name="170" href="#170">170</a> <em class="jxr_javadoccomment"> * in the class we are methodizing.</em> |
| <a name="171" href="#171">171</a> <em class="jxr_javadoccomment"> */</em> |
| <a name="172" href="#172">172</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">void</strong> inspect(Class clas) |
| <a name="173" href="#173">173</a> { |
| <a name="174" href="#174">174</a> Field[] fields = clas.getFields(); |
| <a name="175" href="#175">175</a> <strong class="jxr_keyword">for</strong>( <strong class="jxr_keyword">int</strong> i = 0; i < fields.length; i++) |
| <a name="176" href="#176">176</a> { |
| <a name="177" href="#177">177</a> <em class="jxr_comment">/*</em> |
| <a name="178" href="#178">178</a> <em class="jxr_comment"> * only if public and static</em> |
| <a name="179" href="#179">179</a> <em class="jxr_comment"> */</em> |
| <a name="180" href="#180">180</a> <strong class="jxr_keyword">int</strong> mod = fields[i].getModifiers(); |
| <a name="181" href="#181">181</a> <strong class="jxr_keyword">if</strong> ( Modifier.isStatic(mod) && Modifier.isPublic(mod) ) |
| <a name="182" href="#182">182</a> { |
| <a name="183" href="#183">183</a> fieldHash.put(fields[i].getName(), fields[i]); |
| <a name="184" href="#184">184</a> classHash.put(fields[i].getName(), clas); |
| <a name="185" href="#185">185</a> } |
| <a name="186" href="#186">186</a> } |
| <a name="187" href="#187">187</a> } |
| <a name="188" href="#188">188</a> } |
| </pre> |
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