com.hack23.cia.web.impl.ui.application.UiInstanceErrorHandler.java Source code

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Here is the source code for com.hack23.cia.web.impl.ui.application.UiInstanceErrorHandler.java

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/*
 * Copyright 2014 James Pether Srling
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 *   $Id$
 *  $HeadURL$
*/
package com.hack23.cia.web.impl.ui.application;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.security.access.AccessDeniedException;

import com.hack23.cia.web.impl.ui.application.views.common.viewnames.CommonsViews;
import com.vaadin.server.ErrorEvent;
import com.vaadin.server.ErrorHandler;
import com.vaadin.ui.Notification;
import com.vaadin.ui.UI;

/**
 * The Class UiInstanceErrorHandler.
 */
public final class UiInstanceErrorHandler implements ErrorHandler {

    /** The Constant serialVersionUID. */
    private static final long serialVersionUID = 1L;

    /** The Constant LOG_WARN_VAADIN_ERROR. */
    private static final String LOG_WARN_VAADIN_ERROR = "Vaadin error";

    /** The Constant LOGGER. */
    private static final Logger LOGGER = LoggerFactory.getLogger(UiInstanceErrorHandler.class);

    /** The ui. */
    private final UI ui;

    /**
     * Instantiates a new ui instance error handler.
     *
     * @param ui
     *            the ui
     */
    public UiInstanceErrorHandler(final UI ui) {
        super();
        this.ui = ui;
    }

    @Override
    public void error(final ErrorEvent event) {
        if (event.getThrowable() instanceof AccessDeniedException) {
            final AccessDeniedException accessDeniedException = (AccessDeniedException) event.getThrowable();
            Notification.show(accessDeniedException.getMessage(), Notification.Type.ERROR_MESSAGE);
            ui.getNavigator().navigateTo(CommonsViews.MAIN_VIEW_NAME);
            return;
        } else if (event.getThrowable().getCause() != null && event.getThrowable().getCause().getCause() != null
                && event.getThrowable().getCause().getCause().getCause() instanceof AccessDeniedException) {
            final AccessDeniedException accessDeniedException = (AccessDeniedException) event.getThrowable()
                    .getCause().getCause().getCause();
            Notification.show(accessDeniedException.getMessage(), Notification.Type.ERROR_MESSAGE);
            ui.getNavigator().navigateTo(CommonsViews.MAIN_VIEW_NAME);
            return;
        } else {
            LOGGER.warn(LOG_WARN_VAADIN_ERROR, event.getThrowable());
        }
    }

}