examples/karaf-config-example/karaf-config-example-static/src/main/java/org/apache/karaf/example/config/Activator.java

/*
 *  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.apache.karaf.example.config;

import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceReference;
import org.osgi.service.cm.Configuration;
import org.osgi.service.cm.ConfigurationAdmin;

import java.util.Dictionary;
import java.util.Enumeration;

public class Activator implements BundleActivator {

    @Override
    public void start(BundleContext bundleContext) {
        ServiceReference<ConfigurationAdmin> reference = bundleContext.getServiceReference(ConfigurationAdmin.class);
        if (reference != null) {
            // retrieving the ConfigurationAdmin service
            ConfigurationAdmin configurationAdmin = bundleContext.getService(reference);
            try {
                // retrieving the configuration using the PID
                Configuration configuration = configurationAdmin.getConfiguration("org.apache.karaf.example.config");
                if (configuration != null) {
                    Dictionary<String, Object> properties = configuration.getProperties();
                    Enumeration<String> keys = properties.keys();
                    while (keys.hasMoreElements()) {
                        String key = keys.nextElement();
                        System.out.println(key + " = " + properties.get(key));
                    }
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
            bundleContext.ungetService(reference);
        }
    }

    @Override
    public void stop(BundleContext bundleContext) {
        // nothing to do
    }

}