content: /*
   * 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.distributedlog.util;
  
  import java.util.Iterator;
  import org.apache.commons.configuration2.Configuration;
  import org.apache.distributedlog.DistributedLogConfiguration;
  import org.apache.distributedlog.common.config.ConcurrentConstConfiguration;
  import org.apache.distributedlog.config.DynamicDistributedLogConfiguration;
  
  
  /**
   * Utils to conf.
   */
  public class ConfUtils {
  
      /**
       * Load configurations with prefixed <i>section</i> from source configuration <i>srcConf</i> into
       * target configuration <i>targetConf</i>.
       *
       * @param targetConf
       *          Target Configuration
       * @param srcConf
       *          Source Configuration
       * @param section
       *          Section Key
       */
      public static void loadConfiguration(Configuration targetConf, Configuration srcConf, String section) {
          Iterator confKeys = srcConf.getKeys();
          while (confKeys.hasNext()) {
              Object keyObject = confKeys.next();
              if (!(keyObject instanceof String)) {
                  continue;
              }
              String key = (String) keyObject;
              if (key.startsWith(section)) {
                  targetConf.setProperty(key.substring(section.length()), srcConf.getProperty(key));
              }
          }
      }
  
      /**
       * Create const dynamic configuration based on distributedlog configuration.
       *
       * @param conf
       *          static distributedlog configuration.
       * @return dynamic configuration
       */
      public static DynamicDistributedLogConfiguration getConstDynConf(DistributedLogConfiguration conf) {
          ConcurrentConstConfiguration constConf = new ConcurrentConstConfiguration(conf);
          return new DynamicDistributedLogConfiguration(constConf);
      }
  }
  