📄 velocitymenudisplayer.html
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<a name="1" href="#1">1</a> <em class="comment">/*</em>
<a name="2" href="#2">2</a> <em class="comment"> * VelocityMenuDisplayer.java</em>
<a name="3" href="#3">3</a> <em class="comment"> *</em>
<a name="4" href="#4">4</a> <em class="comment"> * Created on December 7, 2002, 12:35 AM</em>
<a name="5" href="#5">5</a> <em class="comment"> */</em>
<a name="6" href="#6">6</a> <strong>package</strong> net.sf.navigator.displayer;
<a name="7" href="#7">7</a>
<a name="8" href="#8">8</a> <strong>import</strong> net.sf.navigator.menu.MenuComponent;
<a name="9" href="#9">9</a> <strong>import</strong> org.apache.commons.lang.StringUtils;
<a name="10" href="#10">10</a> <strong>import</strong> org.apache.commons.logging.Log;
<a name="11" href="#11">11</a> <strong>import</strong> org.apache.commons.logging.LogFactory;
<a name="12" href="#12">12</a> <strong>import</strong> org.apache.velocity.Template;
<a name="13" href="#13">13</a> <strong>import</strong> org.apache.velocity.VelocityContext;
<a name="14" href="#14">14</a> <strong>import</strong> org.apache.velocity.app.VelocityEngine;
<a name="15" href="#15">15</a> <strong>import</strong> org.apache.velocity.app.tools.VelocityFormatter;
<a name="16" href="#16">16</a> <strong>import</strong> org.apache.velocity.runtime.RuntimeConstants;
<a name="17" href="#17">17</a> <strong>import</strong> org.apache.velocity.tools.view.servlet.ServletLogger;
<a name="18" href="#18">18</a> <strong>import</strong> org.apache.velocity.tools.view.servlet.WebappLoader;
<a name="19" href="#19">19</a>
<a name="20" href="#20">20</a> <strong>import</strong> javax.servlet.ServletContext;
<a name="21" href="#21">21</a> <strong>import</strong> javax.servlet.http.HttpServletRequest;
<a name="22" href="#22">22</a> <strong>import</strong> javax.servlet.jsp.JspException;
<a name="23" href="#23">23</a> <strong>import</strong> javax.servlet.jsp.PageContext;
<a name="24" href="#24">24</a> <strong>import</strong> java.io.IOException;
<a name="25" href="#25">25</a> <strong>import</strong> java.io.StringWriter;
<a name="26" href="#26">26</a> <strong>import</strong> java.util.*;
<a name="27" href="#27">27</a>
<a name="28" href="#28">28</a> <em>/**</em>
<a name="29" href="#29">29</a> <em> * @author <a href="<a href="mailto:matt@raibledesigns.com" target="alexandria_uri">mailto:matt@raibledesigns.com</a>">Matt Raible</a></em>
<a name="30" href="#30">30</a> <em> * @version 1.0</em>
<a name="31" href="#31">31</a> <em> */</em>
<a name="32" href="#32">32</a> <strong>public</strong> <strong>class</strong> <a href="../../../../net/sf/navigator/displayer/VelocityMenuDisplayer.html">VelocityMenuDisplayer</a> <strong>extends</strong> <a href="../../../../net/sf/navigator/displayer/MessageResourcesMenuDisplayer.html">MessageResourcesMenuDisplayer</a> {
<a name="33" href="#33">33</a> <strong>protected</strong> <strong>static</strong> <strong>final</strong> Log log = LogFactory.getLog(VelocityMenuDisplayer.<strong>class</strong>);
<a name="34" href="#34">34</a> <strong>private</strong> <strong>static</strong> VelocityEngine velocityEngine = <strong>new</strong> VelocityEngine();
<a name="35" href="#35">35</a> <strong>private</strong> PageContext pageContext = <strong>null</strong>;
<a name="36" href="#36">36</a>
<a name="37" href="#37">37</a> <strong>public</strong> <strong>static</strong> <strong>void</strong> initialize(ServletContext context) {
<a name="38" href="#38">38</a> velocityEngine.setApplicationAttribute(ServletContext.<strong>class</strong>.getName(), context);
<a name="39" href="#39">39</a>
<a name="40" href="#40">40</a> <em class="comment">// default to servletlogger, which logs to the servlet engines log</em>
<a name="41" href="#41">41</a> velocityEngine.setProperty(RuntimeConstants.RUNTIME_LOG_LOGSYSTEM_CLASS,
<a name="42" href="#42">42</a> ServletLogger.<strong>class</strong>.getName());
<a name="43" href="#43">43</a>
<a name="44" href="#44">44</a> <em class="comment">// by default, load resources with webapp resource loader</em>
<a name="45" href="#45">45</a> velocityEngine.setProperty(RuntimeConstants.RESOURCE_LOADER, <span class="string">"webapp"</span>);
<a name="46" href="#46">46</a> velocityEngine.setProperty(<span class="string">"webapp.resource.loader.class"</span>, WebappLoader.<strong>class</strong>.getName());
<a name="47" href="#47">47</a>
<a name="48" href="#48">48</a> <em class="comment">// now all is ready - init Velocity</em>
<a name="49" href="#49">49</a> <strong>try</strong> {
<a name="50" href="#50">50</a> Properties props = <strong>new</strong> Properties();
<a name="51" href="#51">51</a> ResourceBundle defaults = ResourceBundle.getBundle(<span class="string">"net.sf.navigator.displayer.velocity"</span>);
<a name="52" href="#52">52</a> <strong>for</strong> (Enumeration keys = defaults.getKeys(); keys.hasMoreElements();) {
<a name="53" href="#53">53</a> String key = (String) keys.nextElement();
<a name="54" href="#54">54</a> props.put(key, defaults.getString(key));
<a name="55" href="#55">55</a> }
<a name="56" href="#56">56</a>
<a name="57" href="#57">57</a> <em class="comment">// look to see if the user has overridden velocity.properties by</em>
<a name="58" href="#58">58</a> <em class="comment">// placing velocity.properties in WEB-INF/classes</em>
<a name="59" href="#59">59</a> ResourceBundle custom = <strong>null</strong>;
<a name="60" href="#60">60</a>
<a name="61" href="#61">61</a> <strong>try</strong> {
<a name="62" href="#62">62</a> custom = ResourceBundle.getBundle(<span class="string">"velocity"</span>);
<a name="63" href="#63">63</a> <strong>for</strong> (Enumeration keys = custom.getKeys(); keys.hasMoreElements();) {
<a name="64" href="#64">64</a> String key = (String) keys.nextElement();
<a name="65" href="#65">65</a> props.put(key, custom.getString(key));
<a name="66" href="#66">66</a> }
<a name="67" href="#67">67</a> } <strong>catch</strong> (MissingResourceException mre) {
<a name="68" href="#68">68</a> log.debug(<span class="string">"No velocity.properties found in classpath, using default settings"</span>);
<a name="69" href="#69">69</a> }
<a name="70" href="#70">70</a>
<a name="71" href="#71">71</a> velocityEngine.init(props);
<a name="72" href="#72">72</a> } <strong>catch</strong> (Exception e) {
<a name="73" href="#73">73</a> log.error(<span class="string">"Error initializing Velocity: "</span> + e.getMessage());
<a name="74" href="#74">74</a> e.printStackTrace();
<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="comment">//~ Methods ================================================================</em>
<a name="79" href="#79">79</a>
<a name="80" href="#80">80</a> <strong>public</strong> <strong>void</strong> init(PageContext pageContext, <a href="../../../../net/sf/navigator/displayer/MenuDisplayerMapping.html">MenuDisplayerMapping</a> mapping) {
<a name="81" href="#81">81</a> <strong>super</strong>.init(pageContext, mapping);
<a name="82" href="#82">82</a> <strong>this</strong>.pageContext = pageContext;
<a name="83" href="#83">83</a> }
<a name="84" href="#84">84</a>
<a name="85" href="#85">85</a> <strong>public</strong> <strong>void</strong> display(<a href="../../../../net/sf/navigator/menu/MenuComponent.html">MenuComponent</a> menu) throws JspException, IOException {
<a name="86" href="#86">86</a> <strong>if</strong> (isAllowed(menu)) {
<a name="87" href="#87">87</a> displayComponents(menu);
<a name="88" href="#88">88</a> }
<a name="89" href="#89">89</a> }
<a name="90" href="#90">90</a>
<a name="91" href="#91">91</a> <strong>protected</strong> <strong>void</strong> displayComponents(<a href="../../../../net/sf/navigator/menu/MenuComponent.html">MenuComponent</a> menu)
<a name="92" href="#92">92</a> throws JspException, IOException {
<a name="93" href="#93">93</a> HttpServletRequest request = (HttpServletRequest) pageContext.getRequest();
<a name="94" href="#94">94</a> Template t;
<a name="95" href="#95">95</a>
<a name="96" href="#96">96</a> <strong>try</strong> {
<a name="97" href="#97">97</a> String template = getConfig();
<a name="98" href="#98">98</a>
<a name="99" href="#99">99</a> <strong>if</strong> (template == <strong>null</strong>) {
<a name="100" href="#100">100</a> <strong>throw</strong> <strong>new</strong> JspException(<span class="string">"You must specify a template using the 'config' attribute."</span>);
<a name="101" href="#101">101</a> } <strong>else</strong> {
<a name="102" href="#102">102</a> log.debug(<span class="string">"using template: "</span> + template);
<a name="103" href="#103">103</a> }
<a name="104" href="#104">104</a>
<a name="105" href="#105">105</a> t = velocityEngine.getTemplate(template);
<a name="106" href="#106">106</a> } <strong>catch</strong> (Exception e) {
<a name="107" href="#107">107</a> String msg = <span class="string">"Error initializing Velocity: "</span> + e.toString();
<a name="108" href="#108">108</a> log.error(msg, e);
<a name="109" href="#109">109</a> <strong>throw</strong> <strong>new</strong> JspException(msg, e);
<a name="110" href="#110">110</a> }
<a name="111" href="#111">111</a>
<a name="112" href="#112">112</a> StringWriter sw = <strong>new</strong> StringWriter();
<a name="113" href="#113">113</a> VelocityContext context = <strong>new</strong> VelocityContext();
<a name="114" href="#114">114</a>
<a name="115" href="#115">115</a> context.put(<span class="string">"formatter"</span>, <strong>new</strong> VelocityFormatter(context));
<a name="116" href="#116">116</a> context.put(<span class="string">"now"</span>, Calendar.getInstance().getTime());
<a name="117" href="#117">117</a> context.put(<span class="string">"ctxPath"</span>, request.getContextPath());
<a name="118" href="#118">118</a> <em class="comment">// add a helper class for string manipulation</em>
<a name="119" href="#119">119</a> context.put(<span class="string">"stringUtils"</span>, <strong>new</strong> StringUtils());
<a name="120" href="#120">120</a>
<a name="121" href="#121">121</a> <em class="comment">// add a Map for use by the Expandable List Menu</em>
<a name="122" href="#122">122</a> context.put(<span class="string">"map"</span>, <strong>new</strong> HashMap());
<a name="123" href="#123">123</a>
<a name="124" href="#124">124</a> <em class="comment">// see if a name and property were passed in</em>
<a name="125" href="#125">125</a> <strong>if</strong> (!StringUtils.isEmpty(name)) {
<a name="126" href="#126">126</a> Object val1 = pageContext.findAttribute(name);
<a name="127" href="#127">127</a>
<a name="128" href="#128">128</a> <strong>if</strong> (val1 != <strong>null</strong>) {
<a name="129" href="#129">129</a> context.put(name, val1);
<a name="130" href="#130">130</a> }
<a name="131" href="#131">131</a> }
<a name="132" href="#132">132</a>
<a name="133" href="#133">133</a> <em class="comment">// request-scope attributes</em>
<a name="134" href="#134">134</a> Enumeration e = request.getAttributeNames();
<a name="135" href="#135">135</a>
<a name="136" href="#136">136</a> <strong>while</strong> (e.hasMoreElements()) {
<a name="137" href="#137">137</a> String name = (String) e.nextElement();
<a name="138" href="#138">138</a> Object value = request.getAttribute(name);
<a name="139" href="#139">139</a> context.put(name, value);
<a name="140" href="#140">140</a> }
<a name="141" href="#141">141</a>
<a name="142" href="#142">142</a> context.put(<span class="string">"request"</span>, request);
<a name="143" href="#143">143</a> context.put(<span class="string">"session"</span>, request.getSession(false));
<a name="144" href="#144">144</a>
<a name="145" href="#145">145</a> <strong>if</strong> (pageContext.getAttribute(<span class="string">"menuId"</span>) != <strong>null</strong>) {
<a name="146" href="#146">146</a> context.put(<span class="string">"menuId"</span>, pageContext.getAttribute(<span class="string">"menuId"</span>));
<a name="147" href="#147">147</a> }
<a name="148" href="#148">148</a> context.put(<span class="string">"menu"</span>, menu);
<a name="149" href="#149">149</a> context.put(<span class="string">"displayer"</span>, <strong>this</strong>);
<a name="150" href="#150">150</a>
<a name="151" href="#151">151</a> <strong>try</strong> {
<a name="152" href="#152">152</a> t.merge(context, sw);
<a name="153" href="#153">153</a> } <strong>catch</strong> (Exception ex) {
<a name="154" href="#154">154</a> ex.printStackTrace();
<a name="155" href="#155">155</a> <strong>throw</strong> <strong>new</strong> JspException(ex);
<a name="156" href="#156">156</a> }
<a name="157" href="#157">157</a>
<a name="158" href="#158">158</a> String result = sw.getBuffer().toString();
<a name="159" href="#159">159</a>
<a name="160" href="#160">160</a> <em class="comment">// Print this element to our output writer</em>
<a name="161" href="#161">161</a> pageContext.getOut().print(result);
<a name="162" href="#162">162</a> }
<a name="163" href="#163">163</a>
<a name="164" href="#164">164</a> <strong>public</strong> <strong>void</strong> end(PageContext context) {
<a name="165" href="#165">165</a> <strong>this</strong>.pageContext = <strong>null</strong>;
<a name="166" href="#166">166</a> }
<a name="167" href="#167">167</a> }
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