/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you 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 org.wso2.carbon.ui.util;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.osgi.framework.BundleContext;
import org.osgi.util.tracker.ServiceTracker;
import org.wso2.carbon.ui.CarbonUIUtil;
import org.wso2.carbon.ui.UIAnnouncement;

import javax.servlet.ServletConfig;
import javax.servlet.http.HttpSession;

public class UIAnnouncementDeployer {

    private static Log log = LogFactory.getLog(UIAnnouncementDeployer.class);
    private static ServiceTracker uiAnnouncementTracker = null;

    public static String getAnnouncementHtml(HttpSession session, ServletConfig config) {
        UIAnnouncement uiAnnouncement = (UIAnnouncement) uiAnnouncementTracker.getService();
        if (uiAnnouncement == null) {
            return ""; // empty htmls
        }
        return uiAnnouncement.getAnnouncementHtml(session, config);
    }

    public static void deployNotificationSources() {
        BundleContext bundleContext = CarbonUIUtil.getBundleContext();
        uiAnnouncementTracker = new ServiceTracker(bundleContext,
                UIAnnouncement.class.getName(), null);
        uiAnnouncementTracker.open();
    }

    public static void undeployNotificationSources() {
        uiAnnouncementTracker.close();
    }
}
