Examples of org.apache.tapestry5.runtime.Component

org.apache.tapestry5.runtime.Component
Interface that defines the lifecycle of a component, within a page, allowing for callbacks into the component for many different events. This interface is part of the public API for Tapestry, but is not expected to be directly implemented by component classes; it should only be implemented as part of the component class transformation process.
Most of the methods are related to render phases; see the corresponding annotations and component rendering documentation to see how they relate to each other.
Starting in 5.3 this interface no longer implements {@link PageLifecycleListener}. Normally, this would be an incompatible change, but Component is not supposed to be directly implemented by user code.


            logger.debug("Processing actions: {}", clientEncodedActions);


            ObjectInputStream ois = null;


            Component component = null;


            try
            {
                ois = clientDataEncoder.decodeClientData(clientEncodedActions);


                while (!eventCallback.isAborted())
                {
                    String componentId = ois.readUTF();
                    boolean cancelAction = ois.readBoolean();
                    ComponentAction action = (ComponentAction) ois.readObject();


                    // Actions are a mix of ordinary actions and cancel actions.  Filter out one set or the other
                    // based on whether the form was submitted or cancelled.
                    if (forFormCancel != cancelAction)
                    {
                        continue;
                    }


                    component = source.getComponent(componentId);


                    logger.debug("Processing: {} {}", componentId, action);


                    action.execute(component);


                    component = null;
                }
            } catch (EOFException ex)
            {
                // Expected
            } catch (Exception ex)
            {
                Location location = component == null ? null : component.getComponentResources().getLocation();


                throw new TapestryException(ex.getMessage(), location, ex);
            } finally
            {
                InternalUtils.close(ois);

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            // See https://issues.apache.org/jira/browse/TAP5-1632
            javascriptSupport.allocateClientId(name);


        }


        Component activePage = componentSource.getActivePage();


        // This is unlikely but may be possible if people override some of the standard
        // exception reporting logic.


        if (activePage == null)
            return;


        ComponentResources activePageResources = activePage.getComponentResources();


        try
        {


            activePageResources.triggerEvent(EventConstants.PREALLOCATE_FORM_CONTROL_NAMES, new Object[]

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    {
        FileUploadException uploadException = decoder.getUploadException();


        if (uploadException != null)
        {
            Component page = componentSource.getPage(parameters.getActivePageName());


            ComponentResultProcessorWrapper callback = new ComponentResultProcessorWrapper(resultProcessor);


            page.getComponentResources().triggerEvent(UploadEvents.UPLOAD_EXCEPTION, new Object[] { uploadException },
                                                      callback);


            // If an event handler exists and returns a value, then the callback will be aborted and a response
            // (typically a redirect) will already have been sent to the client.

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        notBlank(parameterName, "parameterName");
        notNull(resources, "resources");


        String componentId = resources.getId();


        Component container = resources.getContainer();


        // Only provide a default binding if the container actually contains the property.
        // This sets up an error condition for when the parameter is not bound, and
        // the binding can't be deduced.

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        {
            logger.debug("Processing actions: {}", actionsBase64);


            ObjectInputStream ois = null;


            Component component = null;


            try
            {
                ois = new Base64ObjectInputStream(actionsBase64);


                while (true)
                {
                    String componentId = ois.readUTF();
                    ComponentAction action = (ComponentAction) ois.readObject();


                    component = source.getComponent(componentId);


                    logger.debug("Processing: {} {}", componentId, action);


                    action.execute(component);


                    component = null;
                }
            }
            catch (EOFException ex)
            {
                // Expected
            }
            catch (Exception ex)
            {
                Location location = component == null ? null : component.getComponentResources().getLocation();


                throw new TapestryException(ex.getMessage(), location, ex);
            }
            finally
            {

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    @Test
    public void block_not_found()
    {
        Page page = newPage(PAGE_NAME);
        Component component = mockComponent();
        ComponentModel model = mockComponentModel();
        Logger logger = mockLogger();
        Logger eventLogger = mockLogger();
        PageResources pr = mockPageResources(logger, eventLogger);

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    @Test
    public void block_found()
    {
        Page page = newPage(PAGE_NAME);
        Component component = mockComponent();
        ComponentModel model = mockComponentModel();
        Block block = mockBlock();
        Logger logger = mockLogger();
        Logger eventLogger = mockLogger();
        PageResources pr = mockPageResources(logger, eventLogger);

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    @Test
    public void parameter_is_bound()
    {
        Page page = newPage(PAGE_NAME);
        Component component = mockComponent();
        ComponentModel model = mockComponentModel();
        Binding binding = mockBinding();
        Logger logger = mockLogger();
        Logger eventLogger = mockLogger();
        PageResources pr = mockPageResources(logger, eventLogger);

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    @Test
    public void duplicate_block_id()
    {
        Page page = newPage(PAGE_NAME);
        Component component = mockComponent();
        ComponentModel model = mockComponentModel();
        Block block1 = mockBlock();
        Block block2 = mockBlock();
        Logger logger = mockLogger();
        Logger eventLogger = mockLogger();

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    @Test
    public void verify_required_parameters_all_are_bound()
    {
        Page page = newPage(PAGE_NAME);
        Component component = mockComponent();
        ComponentModel model = mockComponentModel();
        Binding binding = mockBinding();
        ParameterModel pmodel = mockParameterModel();
        Logger logger = mockLogger();
        Logger eventLogger = mockLogger();
        PageResources pr = mockPageResources(logger, eventLogger);


        train_getLogger(model, logger);
        train_isDebugEnabled(eventLogger, false);


        Instantiator ins = mockInstantiator(component, model);


        train_getParameterNames(model, "barney");
        train_getParameterModel(model, "barney", pmodel);


        component.containingPageDidLoad();


        replay();


        ComponentPageElementImpl cpe = new ComponentPageElementImpl(page, ins, pr);

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