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Vaadin Portlet
There is a newer version: 8.27.5
/*
 * Copyright 2000-2022 Vaadin Ltd.
 *
 * Licensed under the Commercial Vaadin Developer License version 4.0 (CVDLv4);
 * you may not use this file except in compliance with the License. You may obtain
 * a copy of the License at
 *
 * https://vaadin.com/license/cvdl-4.0
 *
 * 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.server;

import javax.portlet.PortletConfig;
import javax.portlet.PortletException;
import javax.portlet.PortletRequest;

import com.vaadin.util.ReflectTools;

public class LegacyVaadinPortlet extends VaadinPortlet {

    private static final LegacyApplicationUIProvider PROVIDER = new LegacyApplicationUIProvider() {
        @Override
        protected LegacyApplication createApplication() {
            VaadinPortlet portlet = VaadinPortlet.getCurrent();
            if (portlet instanceof LegacyVaadinPortlet) {
                LegacyVaadinPortlet legacyPortlet = (LegacyVaadinPortlet) portlet;
                PortletRequest request = VaadinPortletService
                        .getCurrentPortletRequest();
                if (legacyPortlet.shouldCreateApplication(request)) {
                    try {
                        return legacyPortlet.getNewApplication(request);
                    } catch (PortletException e) {
                        throw new RuntimeException(e);
                    }
                }
            }
            return null;
        }
    };

    @Override
    public void init(PortletConfig portletConfig) throws PortletException {
        super.init(portletConfig);

        getService().addSessionInitListener((SessionInitEvent event) -> {
            try {
                onVaadinSessionStarted(
                        (VaadinPortletRequest) event.getRequest(),
                        (VaadinPortletSession) event.getSession());
            } catch (PortletException e) {
                throw new ServiceException(e);
            }
        });
    }

    protected Class getApplicationClass()
            throws ClassNotFoundException {
        try {
            return ServletPortletHelper.getLegacyApplicationClass(getService());
        } catch (ServiceException e) {
            throw new RuntimeException(e);
        }
    }

    protected LegacyApplication getNewApplication(PortletRequest request)
            throws PortletException {
        try {
            Class applicationClass = getApplicationClass();
            return ReflectTools.createInstance(applicationClass);
        } catch (Exception e) {
            throw new PortletException(e);
        }
    }

    private void onVaadinSessionStarted(VaadinPortletRequest request,
            VaadinPortletSession session) throws PortletException {
        session.addUIProvider(PROVIDER);
    }

    protected boolean shouldCreateApplication(PortletRequest request) {
        return true;
    }
}