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Swift Under File System implementation

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/*
 * Licensed to the University of California, Berkeley 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 tachyon.underfs.swift;

import org.apache.hadoop.conf.Configuration;

import tachyon.conf.TachyonConf;

public class SwiftUnderFileSystemUtils {

  /**
   * Replaces default key with user provided key.
   *
   * @param conf the Hadoop configuration
   * @param tachyonConf the Tachyon configuration
   * @param key the key to add
   */
  public static void addKey(Configuration conf, TachyonConf tachyonConf, String key) {
    if (System.getProperty(key) != null && conf.get(key) == null) {
      conf.set(key, System.getProperty(key));
    } else if (tachyonConf.containsKey(key)) {
      conf.set(key, tachyonConf.get(key));
    }
  }
}