/*
    * Copyright 2014 James Pether Sörling
    *
    * 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());
  		}
  	}
  
  }