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 $


    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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         *  Now make an event cartridge, register all the
         *  event handlers (at once) and attach it to the
         *  Context
         */
        
        EventCartridge ec = new EventCartridge();
        ec.addEventHandler(te);
        ec.attachToContext( inner );
        
        doTestInvalidReferenceEventHandler1(ve, inner);
        doTestInvalidReferenceEventHandler2(ve, inner);
        doTestInvalidReferenceEventHandler3(ve, inner);
        doTestInvalidReferenceEventHandler4(ve, inner);

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    /**
     * @see org.apache.velocity.context.InternalEventContext#attachEventCartridge(org.apache.velocity.app.event.EventCartridge)
     */
    public EventCartridge attachEventCartridge( EventCartridge ec )
    {
        EventCartridge temp = eventCartridge;


        eventCartridge = ec;


        return temp;
    }

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            /*
             *  event cartridge stuff
             */


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


            /*
             *  make a writer, and merge the template 'against' the context
             */

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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( inner );
  
        /*
         *  now wrap the event cartridge - we want to make sure that
         *  we can do this w/o harm
         */

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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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            /*
             *  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)
                {
                    Runtime.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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