/*
 * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
 * (the "License"). You may not use this work except in compliance with the License, which is
 * available at www.apache.org/licenses/LICENSE-2.0
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied, as more fully set forth in the License.
 *
 * See the NOTICE file distributed with this work for information regarding copyright ownership.
 */

package alluxio.cli;

import alluxio.Configuration;
import alluxio.PropertyKey;

import java.util.Map.Entry;

/**
 * Utility for printing Alluxio configuration.
 */
public final class GetConf {
  private final static String USAGE = "USAGE: GetConf [KEY]\n\n"
      + "GetConf [KEY] prints the configured value for the given key. If the key is invalid, the "
      + "exit code will be nonzero. If the key is valid but isn't set, an empty string is printed. "
      + "If no key is specified, all configuration is printed.";

  /**
   * @param args should be size 0 or 1; if size 1, the specified configuration value is printed,
   *        otherwise all configuration is printed
   */
  public static void main(String[] args) {
    switch (args.length) {
      case 0:
        for (Entry<String, String> entry : Configuration.toMap().entrySet()) {
          String key = entry.getKey();
          String value = entry.getValue();
          System.out.println(String.format("%s=%s", key, value));
        }
        break;
      case 1:
        if (!PropertyKey.isValid(args[0])) {
          System.out.println(String.format("%s is not a valid configuration key", args[0]));
          System.out.println(USAGE);
          System.exit(1);
        }
        PropertyKey key = PropertyKey.fromString(args[0]);
        if (!Configuration.containsKey(key)) {
          System.out.println("");
        } else {
          System.out.println(Configuration.get(key));
        }
        break;
      default:
        System.out.println(USAGE);
        System.exit(1);
    }
  }
}

@@ -715,20 +715,20 @@
 ate 
-final 
 static
+ final
  Str
@@ -2072,11 +2072,83 @@
    %7D%0A  %7D
+%0A%0A  private GetConf() %7B%7D // this class is not intended for instantiation
 %0A%7D%0A

Fix checkstyle