Examples of org.apache.velocity.app.VelocityEngine

org.apache.velocity.app.VelocityEngine

This class provides a separate new-able instance of the Velocity template engine. The alternative model for use is using the Velocity class which employs the singleton model.

Please ensure that you call one of the init() variants. This is critical for proper behavior.

Coming soon : Velocity will call the parameter-less init() at the first use of this class if the init() wasn't explicitly called. While this will ensure that Velocity functions, it almost certainly won't function in the way you intend, so please make sure to call init().
@author Geir Magnusson Jr. @version $Id: VelocityEngine.java,v 1.2.2.1 2001/12/09 19:28:24 geirm Exp $


  @Override
  public VelocityEngine getVelocityEngine() {
    if (velocityEngine == null) {
          try {
              velocityEngine = new VelocityEngine("WEB-INF/velocity.properties");
        velocityEngine.init();
      } catch (Exception e) {
              log.error("Can't init velocity engine. " + e.getMessage());
      }
    }

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      return false;
    }
    try
    {
      File daemonTemplate = new File(_daemonTemplate);
      VelocityEngine ve = new VelocityEngine();
      ve.setProperty(VelocityEngine.RESOURCE_LOADER, "file");
      ve.setProperty("file.resource.loader.path", daemonTemplate.getParent());
      ve.setProperty("runtime.log.logsystem.class", VelocityLog.class.getCanonicalName());
      // TODO find a way to set a non static logger
      VelocityLog.setLogger(_logger);
      ve.init();
      Template t = ve.getTemplate(daemonTemplate.getName());
      VelocityContext context = new VelocityContext();
      context.put("w_name", _name);
      context.put("w_long_name", _displayName);
      context.put("w_start_cmd", toStrCommand(_startCmd));
      context.put("w_stop_cmd", toStrCommand(_stopCmd));

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      return false;
    }
    try
    {
      File daemonTemplate = new File(_plistTemplate);
      VelocityEngine ve = new VelocityEngine();
      ve.setProperty(VelocityEngine.RESOURCE_LOADER, "file");
      ve.setProperty("file.resource.loader.path", daemonTemplate.getParent());
      ve.setProperty("runtime.log.logsystem.class", VelocityLog.class.getCanonicalName());
      ve.init();
      Template t = ve.getTemplate(daemonTemplate.getName());
      VelocityContext context = new VelocityContext();
      context.put("name", _plistName);
      context.put("command", Arrays.asList(_execCmd.split(" ")));
      context.put("autoStart", "AUTOMATIC".equals(_config.getString("wrapper.ntservice.starttype", DEFAULT_SERVICE_START_TYPE)));
      FileWriter writer = new FileWriter(_plistFile);

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      return false;
    }
    try
    {
      File daemonTemplate = new File(_plistTemplate);
      VelocityEngine ve = new VelocityEngine();
      ve.setProperty(VelocityEngine.RESOURCE_LOADER, "file");
      ve.setProperty("file.resource.loader.path", daemonTemplate.getParent());
      ve.setProperty("runtime.log.logsystem.class", VelocityLog.class.getCanonicalName());
      ve.init();
      Template t = ve.getTemplate(daemonTemplate.getName());
      VelocityContext context = new VelocityContext();
      context.put("name", _plistName);
      context.put("command", Arrays.asList(_execCmd.split(" ")));
      context.put("autoStart", "AUTOMATIC".equals(_config.getString("wrapper.ntservice.starttype", DEFAULT_SERVICE_START_TYPE)));
      FileWriter writer = new FileWriter(_plistFile);

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        if (context == null) {
            throw new IllegalStateException("context was not set");
        }


        // setup velocity
        VelocityEngine velocity = new VelocityEngine();
        velocity.setProperty(VelocityEngine.FILE_RESOURCE_LOADER_PATH, sourceDir.getAbsolutePath());
        velocity.init();


        List plans = new LinkedList();
        findPlans(sourceDir, plans);
        for (Iterator iterator = plans.iterator(); iterator.hasNext();) {
            File plan = (File) iterator.next();

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        final ClassLoader oldClassLoader = Thread.currentThread().getContextClassLoader();
        try {
          Thread.currentThread().setContextClassLoader(getClass().getClassLoader());
          
          velocity = new VelocityEngine();
          
          // include the Sling resource loader for Velocity
          Properties props = new Properties();
          props.put("sling.resource.loader.description", "Sling Resource Loader for Velocity");
          props.put("sling.resource.loader.class", "org.apache.sling.scripting.velocity.SlingResourceLoader");

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    }
  }
  
  private VelocityEngine createVelocityEngine() {
    try {
      VelocityEngine result = new VelocityEngine();
      result.setProperty("output.encoding", "utf-8");
      result.setProperty("file.resource.loader.path", 
          servletContext.getRealPath("/") + "/WEB-INF/templates/");
      result.setProperty("velocimacro.context.localscope", true);
      
      // Turn off Velocity logging
      result.setProperty("runtime.log.logsystem.class", 
          "org.apache.velocity.runtime.log.NullLogSystem");
      
      // XML-escape *all* references inserted into templates
      result.setProperty("eventhandler.referenceinsertion.class", EscapeXmlReference.class.getName());
      
      // Enable caching
      result.setProperty("file.resource.loader.cache", true);
      
      result.init();
      return result;
    } catch (Exception ex) {
      throw new RuntimeException(ex);
    }
  }

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    @Override
    public void render(HttpServletRequest request, HttpServletResponse response, 
            AppProperties properties)
            throws ServletException, IOException {


        VelocityEngine engine = (VelocityEngine)properties.getProperty(CONFIG_PROPERTY);
        
        Template template = engine.getTemplate(templateName);
        
        try {
            
            template.merge(new VelocityContext(attributes), response.getWriter());

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    public void initialize(InitParams initParams, AppResources resources, 
            AppPropertyCollector collector) {
        
        //String ftlPath = getVMPath(initParams); //TODO use path
        
        VelocityEngine engine = new VelocityEngine();
        engine.setProperty("resource.loader", "mojave"); 
        //TODO replace with MojaveResourceLoader
        // see org.apache.velocity.tools.view.servlet.WebappLoader
        engine.setProperty("mojave.resource.loader.instance", new FileResourceLoader());
        Vector<String> path = new Vector<String>();
        path.add("src/test/resources/standard/WEB-INF/vm");
        engine.setProperty("mojave.resource.loader.path", path);
        engine.init();
        
        collector.addProperty(VM.CONFIG_PROPERTY, engine);
        
        readVMErrorFile(initParams, collector);
    }

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        while (it.hasNext()) {
            Map.Entry pairs = (Map.Entry) it.next();
            List<Feature> featureList = (List<Feature>) pairs.getValue();


            for (Feature feature : featureList) {
                VelocityEngine ve = new VelocityEngine();
                ve.init(getProperties());
                Template featureResult = ve.getTemplate("templates/featureReport.vm");
                VelocityContextMap contextMap = VelocityContextMap.of(new VelocityContext());
                contextMap.putAll(getGeneralParameters());
                contextMap.put("parallel", ReportBuilder.isParallel());
                contextMap.put("feature", feature);
                contextMap.put("report_status_colour", ri.getReportStatusColour(feature));

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