Examples of org.apache.velocity.app.event.EventCartridge

org.apache.velocity.app.event.EventCartridge
Stores the event handlers. Event handlers can be assigned on a per VelocityEngine instance basis by specifying the class names in the velocity.properties file. Event handlers may also be assigned on a per-page basis by creating a new instance of EventCartridge, adding the event handlers, and then calling attachToContext. For clarity, it's recommended that one approach or the other be followed, as the second method is primarily presented for backwards compatibility.
Note that Event Handlers follow a filter pattern, with multiple event handlers allowed for each event. When the appropriate event occurs, all the appropriate event handlers are called in the sequence they were added to the Event Cartridge. See the javadocs of the specific event handler interfaces for more details. @author Will Glass-Husain @author Geir Magnusson Jr. @author Jose Alberto Fernandez @version $Id: EventCartridge.java 292972 2005-10-01 12:36:19Z henning $

        {
            return vg.invoke(o);
        }
        catch(InvocationTargetException ite)
        {
            EventCartridge ec = context.getEventCartridge();


            /*
             *  if we have an event cartridge, see if it wants to veto
             *  also, let non-Exception Throwables go...
             */


            if (ec != null
                    && ite.getTargetException() instanceof java.lang.Exception)
            {
                try
                {
                    return ec.methodException(o.getClass(), vg.getMethodName(),
                            (Exception)ite.getTargetException());
                }
                catch(Exception e)
                {
                    throw new MethodInvocationException(

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        MyFastLocalHandler localHandler2 = new MyFastLocalHandler();
        eventCartridge.addEventHandler(localHandler);
        eventCartridge.addEventHandler(localHandler2);


        // cloned instance
        EventCartridge ecruntime = eventCartridge.getRuntimeInstance();
        assertNotSame(eventCartridge, ecruntime);


        Iterator<?> i = ecruntime.getReferenceInsertionEventHandlers();


        // 1. same as handler
        assertSame(handler, i.next());


        // 2. cloned localHandler
        MyLocalHandler newLocalHandler = (MyLocalHandler) i.next();
        assertNotNull(newLocalHandler);
        assertNotSame(localHandler, newLocalHandler);


        // 3. fast cloned localHandler
        MyFastLocalHandler newLocalHandler2 = (MyFastLocalHandler) i.next();
        assertNotNull(newLocalHandler2);
        assertNotSame(localHandler2, newLocalHandler2);


        assertFalse(i.hasNext());


        // other handlers
        i = ecruntime.getMethodExceptionEventHandlers();


        // same as newLocalHandler
        assertSame(newLocalHandler, i.next());


        // same as newLocalHandler

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      util = new Util();
    }


    if (util instanceof EventHandler)
    {
      EventCartridge ec = new EventCartridge();
      ec.addEventHandler(util);
      ec.attachToContext(cx);
    }
    cx.put(UTIL_KEY, util);
    return cx;
  }

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        {
            return vg.invoke(o);
        }
        catch(InvocationTargetException ite)
        {
            EventCartridge ec = context.getEventCartridge();


            /*
             *  if we have an event cartridge, see if it wants to veto
             *  also, let non-Exception Throwables go...
             */


            if (ec != null
                    && ite.getTargetException() instanceof java.lang.Exception)
            {
                try
                {
                    return ec.methodException(o.getClass(), vg.getMethodName(),
                            (Exception)ite.getTargetException());
                }
                catch(Exception e)
                {
                    throw new MethodInvocationException(

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            /*
             *  first, are we supposed to say anything anyway?
             */
            if(blather)
            {
                EventCartridge ec = context.getEventCartridge();


                boolean doit = true;
               
                /*
                 *  if we have an EventCartridge...
                 */
                if (ec != null)
                {
                    doit = ec.shouldLogOnNullSet( left.literal(), right.literal() );
                }


                if (doit)
                {
                    rsvc.error("RHS of #set statement is null. Context will not be modified. "

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             *  wrap it, and throw.  We don't log here as we want to figure
             *  out which reference threw the exception, so do that 
             *  above
             */


            EventCartridge ec = context.getEventCartridge();


            /*
             *  if we have an event cartridge, see if it wants to veto
             *  also, let non-Exception Throwables go...
             */


            if ( ec != null && ite.getTargetException() instanceof java.lang.Exception)
            {
                try
                {
                    return ec.methodException( o.getClass(), methodName, (Exception)ite.getTargetException() );
                }
                catch( Exception e )
                {
                    throw new MethodInvocationException( 
                        "Invocation of method '"

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         *  the normal processing
         *
         *  if we have an event cartridge, get a new value object
         */


        EventCartridge ec = context.getEventCartridge();


        if (ec != null)
        {
            value =  ec.referenceInsert(literal, value);
        }


        /*
         *  if value is null...
         */

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    private void initializeEventHandlers()
        throws Exception
    {


        eventCartridge = new EventCartridge();


        /**
         * For each type of event handler, get the class name, instantiate it, and store it.
         */

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        return supported;
    }


    public EventCartridge getRuntimeInstance() {
        EventCartridge runtimeInstance = this;


        if (needsClone) {
            runtimeInstance = new EventCartridge();


            for (EventHandler ev : allHandlers) {
                if (ev instanceof ContextAware) {
                    if (ev instanceof FastCloneable) {
                        ev = (EventHandler) ((FastCloneable) ev).createCopy();
                    } else {
                        try {
                            ev = (EventHandler) cloneMethod.invoke(ev);
                        } catch (Exception e) {
                            throw new TemplateException("Could not clone a ContextAware event handler: "
                                                        + ev.getClass().getName(), e);
                        }
                    }
                }


                runtimeInstance.addEventHandler(ev);
            }
        }


        return runtimeInstance;
    }

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            // 模板中的修改将保留在context中。
            eventContext = new EventContext(context);
        }


        // 将event cartridge复制以后（如有必要）附到context中。
        EventCartridge ec = configuration.getEventCartridge().getRuntimeInstance();


        if (ec != null) {
            assertTrue(ec.attachToContext(eventContext), "Could not attach EventCartridge to velocity context");
        }


        return eventContext;
    }

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