/*
* 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.UI;
import com.vaadin.ui.VerticalLayout;
import com.vaadin.v7.ui.TextField;
//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")));
}
}