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 $

    /**
     * @see org.apache.velocity.context.InternalEventContext#attachEventCartridge(org.apache.velocity.app.event.EventCartridge)
     */
    public EventCartridge attachEventCartridge( EventCartridge ec )
    {
        EventCartridge cartridge = innerContext.attachEventCartridge( ec );
        return cartridge;
    }

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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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    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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        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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    /**
     * @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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    }


    private void initializeEventHandlers()
    {


        eventCartridge = new EventCartridge();


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

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    {
        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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        // initialize thread safe velocity engine cache
        int cacheSize = (int) getLongInitParameter(config, CACHE_SIZE_PARAMETER, DEFAULT_CACHE_SIZE);
        velocityEngineConfigCache = new LRUMap(cacheSize);
        velocityEngineCache = new LRUMap(cacheSize/2);
        
        eventCartridge = new EventCartridge();
        // setup NullSetEventHandler to ignore those pesky "ERROR velocity - RHS of #set statement is null. Context will not be modified."
        eventCartridge.addEventHandler(new NullSetEventHandler()
        {
            public boolean shouldLogOnNullSet(String lhs, String rhs) { return false; }
        });

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        // initialize thread safe velocity engine cache
        int cacheSize = (int) getLongInitParameter(config, CACHE_SIZE_PARAMETER, DEFAULT_CACHE_SIZE);
        velocityEngineConfigCache = new LRUMap(cacheSize);
        velocityEngineCache = new LRUMap(cacheSize/2);
        
        eventCartridge = new EventCartridge();
        // setup NullSetEventHandler to ignore those pesky "ERROR velocity - RHS of #set statement is null. Context will not be modified."
        eventCartridge.addEventHandler(new NullSetEventHandler()
        {
            public boolean shouldLogOnNullSet(String lhs, String rhs) { return false; }
        });

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