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 $

    {
        Context ctx = new VelocityContext();


        // Attach an Event Cartridge to it, so we get exceptions
        // while invoking methods from the Velocity Screens
        EventCartridge ec = new EventCartridge();
        ec.addEventHandler(this);
        ec.attachToContext(ctx);
        return ctx;
    }

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         *  Now make an event cartridge, register the
         *  input event handler and attach it to the
         *  Context
         */


        EventCartridge ec = new EventCartridge();
        ec.addEventHandler(this);
        ec.attachToContext( context );




        // BEHAVIOR A: pass through #input and #parse with no change
        EventHandlerBehavior = PASS_THROUGH;

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         *  Now make an event cartridge, register all the
         *  event handlers (at once) and attach it to the
         *  Context
         */


        EventCartridge ec = new EventCartridge();
        ec.addEventHandler(this);
        ec.attachToContext( context );


        try
        {
            /*
             *  lets test each type of event handler individually

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        VelocityEngine ve = new VelocityEngine();
        ReportInvalidReferences reporter = new ReportInvalidReferences();
        ve.init();


        VelocityContext context = new VelocityContext();
        EventCartridge ec = new EventCartridge();
        ec.addEventHandler(reporter);
        ec.attachToContext(context);


        context.put("a1","test");
        context.put("b1","test");
        Writer writer = new StringWriter();

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        ve.setProperty("eventhandler.invalidreference.exception","true");
        ReportInvalidReferences reporter = new ReportInvalidReferences();
        ve.init();


        VelocityContext context = new VelocityContext();
        EventCartridge ec = new EventCartridge();
        ec.addEventHandler(reporter);
        ec.attachToContext(context);


        context.put("a1","test");
        context.put("b1","test");
        Writer writer = new StringWriter();

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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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            /*
             *  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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        {
            return method.invoke(o, null);  
        }
        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(), methodUsed, (Exception)ite.getTargetException() );
                }
                catch( Exception e )
                {
                    throw new MethodInvocationException( 
                      "Invocation of method '" + methodUsed + "'"

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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( nullString, value );
        }


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

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