org.eclipse.osbp.utils/src/org/eclipse/osbp/utils/session/HttpSessionAttributes.java

/**
 *                                                                            
 * Copyright (c) 2011, 2016 - Loetz GmbH&Co.KG (69115 Heidelberg, Germany)
 *                                                                            
 * All rights reserved. This program and the accompanying materials           
 * are made available under the terms of the Eclipse Public License 2.0        
 * which accompanies this distribution, and is available at                  
 * https://www.eclipse.org/legal/epl-2.0/                                 
 *                                 
 * SPDX-License-Identifier: EPL-2.0                                 
 *                                                                            
 * Contributors:   
 * Christophe Loetz (Loetz GmbH&Co.KG) - initial implementation 
 */
package org.eclipse.osbp.utils.session;

import com.vaadin.server.VaadinService;
import com.vaadin.server.WrappedSession;

/**
 * Attributes saved for the http session = session static
 */
public class HttpSessionAttributes {

	private static WrappedSession session() {
		return VaadinService.getCurrentRequest().getWrappedSession();
	}
	
	/**
	 * remove variable
	 * @param variable
	 */
	public static void remove(String variable) {
		session().removeAttribute(variable);
	}

	/**
	 * set variable
	 * @param variable
	 * @param value
	 */
	public static void set(String variable, Object value) {
		session().setAttribute(variable, value);
	}

	/**
	 * get variable
	 * @param variable
	 */
	public static Object get(String variable) {
	    return session().getAttribute(variable);
	}
	
	/**
	 * remove variable
	 * @param variable
	 */
    public static <T> void remove(Class<T> variable) {
    	session().setAttribute(variable.getCanonicalName(), null);
    }

	/**
	 * set variable
	 * @param variable
	 * @param value
	 */
    public static <T> void set(Class<T> variable, T value) {
    	session().setAttribute(variable.getCanonicalName(), value);
    }
	
	/**
	 * get variable
	 * @param variable
	 */
    public static <T> T get(Class<T> variable) {
    	try {
    		return (T) session().getAttribute(variable.getCanonicalName());
    	}
    	catch (Exception e) {
    		return null;
    	}
    }
}