uitest/src/com/vaadin/tests/minitutorials/v7b5/SettingReadingSessionAttributesUI.java


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/*
 * Copyright 2012 Vaadin Ltd.
 * 
 * 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.
 */

package com.vaadin.tests.minitutorials.v7b5;

import com.vaadin.server.VaadinRequest;
import com.vaadin.server.VaadinService;
import com.vaadin.ui.Button;
import com.vaadin.ui.Button.ClickEvent;
import com.vaadin.ui.Label;
import com.vaadin.ui.TextField;
import com.vaadin.ui.UI;
import com.vaadin.ui.VerticalLayout;

//Remove comment to preserve UI value when reloading
//@PreserveOnRefresh
public class SettingReadingSessionAttributesUI extends UI {

    private String value;

    private VerticalLayout statusHolder = new VerticalLayout();
    private TextField textField = new TextField();

    @Override
    protected void init(VaadinRequest request) {
        VerticalLayout layout = new VerticalLayout();
        layout.setMargin(true);
        setContent(layout);

        layout.addComponent(statusHolder);
        layout.addComponent(textField);
        layout.addComponent(new Button("Set new values",
                new Button.ClickListener() {
                    @Override
                    public void buttonClick(ClickEvent event) {
                        String value = textField.getValue();

                        saveValue(SettingReadingSessionAttributesUI.this, value);
                    }
                }));
        layout.addComponent(new Button("Reload page",
                new Button.ClickListener() {
                    @Override
                    public void buttonClick(ClickEvent event) {
                        getPage().setLocation(getPage().getLocation());
                    }
                }));

        showValue(this);
    }

    private static void saveValue(SettingReadingSessionAttributesUI ui,
            String value) {
        // Save to UI instance
        ui.value = value;
        // Save to VaadinServiceSession
        ui.getSession().setAttribute("myValue", value);
        // Save to HttpSession
        VaadinService.getCurrentRequest().getWrappedSession()
                .setAttribute("myValue", value);

        // Show new values
        showValue(ui);
    }

    private static void showValue(SettingReadingSessionAttributesUI ui) {
        ui.statusHolder.removeAllComponents();
        ui.statusHolder.addComponent(new Label("Value in UI: " + ui.value));
        ui.statusHolder.addComponent(new Label(
                "Value in VaadinServiceSession: "
                        + ui.getSession().getAttribute("myValue")));
        ui.statusHolder.addComponent(new Label("Value in HttpSession: "
                + VaadinService.getCurrentRequest().getWrappedSession()
                        .getAttribute("myValue")));
    }

}