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 $

        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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            if (targetFile == null) {
                throw new RuntimeException("No target plan supplied");
            }


            File sourceD = new File(sourceDir);
            VelocityEngine velocity = new VelocityEngine();
            velocity.setProperty(VelocityEngine.FILE_RESOURCE_LOADER_PATH, sourceD.getAbsolutePath());
            velocity.init();
            Template template = velocity.getTemplate(planFile);
            StringWriter writer = new StringWriter();
            template.merge(context, writer);


            String plan = writer.toString();

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        //        Might be better of just hand rolling something...
        //


        VelocityContext context = createContext();


        VelocityEngine velocity = new VelocityEngine();
        velocity.setProperty(Velocity.FILE_RESOURCE_LOADER_PATH, sourceDir.getAbsolutePath());


        // Don't spit out any logs
        velocity.setProperty(Velocity.RUNTIME_LOG_LOGSYSTEM_CLASS, "org.apache.velocity.runtime.log.NullLogSystem");
        velocity.init();


        Template template = velocity.getTemplate(planFileName);
        StringWriter writer = new StringWriter();
        template.merge(context, writer);


        String plan = writer.toString();

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      }
    } catch (Exception e) {
      throw new BuildException(e);
    }
    
    VelocityEngine ve = new VelocityEngine();


    try {
      ve.setProperty(RuntimeConstants.FILE_RESOURCE_LOADER_PATH, getTemplatePath());
      if (logFile != null) {
        File lf = new File(logFile);
        if (lf.exists()) {
          if (!lf.delete()) {
            throw new Exception("Could not delete log file " + lf.getCanonicalPath());
          }
        }


        ve.setProperty(RuntimeConstants.RUNTIME_LOG, logFile);
      }


      ve.init();
      Template t = ve.getTemplate(template);


      if (clusterMode == null) {
        clusterMode = new String("");
      }
      if (hadoopVersion == null) {

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                "org.apache.velocity.runtime.resource.loader.FileResourceLoader");
        
        try
        {            
            _properties.setProperty(VELOCITY_FILE_RESOURCE_LOADER_PATH, dir.getCanonicalPath());            
            _engine = new VelocityEngine(_properties);            
        }
        catch(Exception e)
        {
            throw new RuntimeException(e);
        }

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  public synchronized final static TemplateManager getInstance(ServletContext servletContext) {
    return new TemplateManager(servletContext);
  }


  private TemplateManager(ServletContext servletContext) {
    engine = new VelocityEngine();
    engine.setProperty("resource.loader", "webapp");
    engine.setProperty("webapp.resource.loader.class", "org.apache.velocity.tools.view.WebappResourceLoader");
    engine.setProperty("webapp.resource.loader.path", "/WEB-INF/templates/");
    engine.setApplicationAttribute("javax.servlet.ServletContext", servletContext);
  }

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        super(name);
    }


    public void setUp() throws Exception
    {
        engine = new VelocityEngine();


        //by default, make the engine's log output go to the test-report
        log = new TestLogChute(false, false);
        log.setEnabledLevel(TestLogChute.INFO_ID);
        log.setSystemErrLevel(TestLogChute.WARN_ID);

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    }
    catch (Exception e) {
      throw new BuildException(e);
    }
    
    VelocityEngine ve = new VelocityEngine();


    try {
      ve.setProperty(RuntimeConstants.FILE_RESOURCE_LOADER_PATH, templatePath);
      if (logFile != null) {
        File lf = new File(logFile);
        if (lf.exists()) {
          if (!lf.delete()) {
            throw new Exception("Could not delete log file " + lf.getCanonicalPath());
          }
        }


        ve.setProperty(RuntimeConstants.RUNTIME_LOG, logFile);
      }


      ve.init();
      Template t = ve.getTemplate(template);


      // For each of the qFiles generate the test
      VelocityContext ctx = new VelocityContext();
      ctx.put("className", className);
      ctx.put("qfiles", qFiles);

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        initializeClassTemplate(template);
    }


    private void initializeClassTemplate(String template) throws Exception {
        VelocityEngine velocityEngine = new VelocityEngine();
        try {


            // use ClasspathResourceLoader for velocity templates lookup
            // if Cayenne URL is not null, load resource from this URL
            Properties props = new Properties();


            // null logger that will prevent velocity.log from being generated
            props.put(RuntimeConstants.RUNTIME_LOG_LOGSYSTEM_CLASS, NullLogSystem.class
                    .getName());


            props.put("resource.loader", "cayenne");


            props.put(
                    "cayenne.resource.loader.class",
                    "org.apache.velocity.runtime.resource.loader.ClasspathResourceLoader");


            velocityEngine.init(props);
        }
        catch (Exception ex) {
            throw new RuntimeException("Can't initialize Velocity", ex);
        }


        pageTemplate = velocityEngine.getTemplate(template);
    }

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        String logTag = getClass().getName();
        Map variableMap = ExchangeHelper.createVariableMap(exchange);
        Context velocityContext = new VelocityContext(variableMap);


        // let velocity parse and generate the result in buffer
        VelocityEngine engine = getVelocityEngine();
        if (log.isDebugEnabled()) {
            log.debug("Velocity is evaluating using velocity context: " + variableMap);
        }
        engine.evaluate(velocityContext, buffer, logTag, reader);


        // now lets output the results to the exchange
        Message out = exchange.getOut(true);
        out.setBody(buffer.toString());
        out.setHeader("org.apache.camel.velocity.resource", resource);

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