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POHow to retrieve invalid references from Velocity Engine?
 

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  1. POHow to retrieve invalid references from Velocity Engine?
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    <p>I am wondering if there is a way to retrieve a list of invalid references in Velocity after calling VelocityEngine.evaluate.</p> <p><a href="https://stackoverflow.com/questions/7649289/velocity-eventhandler">Velocity Eventhandler</a> has some nice information about creating an <strong>AppSpecificInvalidReferenceEventHandler</strong> which I have used in the VelocityEngine as follows.</p> <pre><code>&lt;bean id="templateVelocityEngine" class="org.springframework.ui.velocity.VelocityEngineFactoryBean"&gt; &lt;property name="velocityProperties"&gt; &lt;props&gt; &lt;prop key="resource.loader"&gt;class&lt;/prop&gt; &lt;prop key="class.resource.loader.class"&gt;org.apache.velocity.runtime.resource.loader.ClasspathResourceLoader&lt;/prop&gt; &lt;prop key="class.resource.loader.cache"&gt;true&lt;/prop&gt; &lt;prop key="eventhandler.invalidreferences.class"&gt;xyz.util.AppSpecificInvalidReferenceEventHandler,org.apache.velocity.app.event.implement.ReportInvalidReferences&lt;/prop&gt; &lt;/props&gt; &lt;/property&gt; &lt;/bean&gt; </code></pre> <p>After velocity's evaluate call, I see the log statements showing that AppSpecificInvalidReferenceEventHandler is working, but I can't see how to retrieve that class and it's List of InvalidReferenceInfo if I declare the <em>eventhandler.invalidreferences.class</em> in the Spring context as above.</p> <p>Populating and evaluating the template looks like the following :-</p> <pre><code>VelocityContext context = new VelocityContext(); StringWriter bodyWriter = new StringWriter(); context.put("body", "some body text!"); boolean result = templateVelocityEngine.evaluate(context, bodyWriter, "logTag", "template ${body} text here loaded from a file"); </code></pre> <p>So I would like to do something like the following (except ec.getInvalidReferenceEventHandlers() is null)</p> <pre><code>EventCartridge ec = context.getEventCartridge(); Iterator it = ec.getInvalidReferenceEventHandlers(); while (it.hasNext()) { Object obj = it.next(); if (obj instanceof ReportInvalidReferences) { AppSpecificInvalidReferenceEventHandler handler = (AppSpecificInvalidReferenceEventHandler) obj; List invalidRefs = handler.getInvalidReferences(); if (!invalidRefs.isEmpty()) { // process the list of invalid references here } } } </code></pre> <p>The only way around this I've found so far is to not declare <em>eventhandler.invalidreferences.class</em> in the Spring bean i.e. instead I would do the following</p> <pre><code>ReportInvalidReferences reporter = new AppSpecificInvalidReferenceEventHandler(); EventCartridge ec = new EventCartridge(); ec.addEventHandler(reporter); ec.attachToContext(context); VelocityContext context = new VelocityContext(); StringWriter bodyWriter = new StringWriter(); context.put("body", "some body text!"); boolean result = templateVelocityEngine.evaluate(context, bodyWriter, "logTag", "template ${body} text here loaded from a file"); </code></pre> <p>With the additional pre Velocity evaluate setup code above (and commenting the <em>eventhandler.invalidreferences.class</em> in the Spring bean), I can then call</p> <pre><code>ec.getInvalidReferenceEventHandlers(); </code></pre> <p>And I get back the AppSpecificInvalidReferenceEventHandler in the Iterator returned...</p>
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    1. USWayne Earnshaw
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