EDIT

// $Id$

/**

* Copyright (C) 2018 EDIT

* European Distributed Institute of Taxonomy

* http://www.e-taxonomy.eu

*

* The contents of this file are subject to the Mozilla Public License Version 1.1

* See LICENSE.TXT at the top of this package for the full license terms.

*/

package eu.etaxonomy.cdm.vaadin.event.error;

import java.util.HashMap;

import java.util.Map;

import org.apache.log4j.Logger;

import com.vaadin.server.ErrorEvent;

import com.vaadin.server.ErrorHandler;

import com.vaadin.ui.Notification;

/**

 * Vaadin allows setting an com.vaadin.server.ErrorHandler for UIs and components.

 * The caveat with this built in approach is that there is only one {@link com.vaadin.server.ErrorHandler}

 * for any type of errors. This <code>DelegatingErrorHandler</code> allows registering handlers for specific types of errors.

 *

 * see https://dev.e-taxonomy.eu/redmine/issues/7241

 *

 * @author freimeier

 * @date 26.02.2018

 *

 */

public class DelegatingErrorHandler implements ErrorHandler{

    private static final long serialVersionUID = 3378605204517477112L;

    Map<Class<? extends Exception>, ErrorTypeHandler<? extends Exception>> handlerMap = new HashMap<>();

    public <E extends Exception> void  registerHandler(Class<E> type, ErrorTypeHandler<E> handler) {

        handlerMap.put(type, handler);

    }

    /* (non-Javadoc)

     * @see com.vaadin.server.ErrorHandler#error(com.vaadin.server.ErrorEvent)

     */

    @Override

    public void error(ErrorEvent event) {

        Class<? extends Throwable> errorClass = event.getThrowable().getCause().getClass();

        Logger.getLogger(this.getClass()).debug(errorClass);

        if(handlerMap.get(errorClass) != null){

            handlerMap.get(errorClass).error(event);

          } else {

            Notification.show(event.getThrowable().getMessage());

          }

    }

}