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.Optional;
  import org.apache.commons.cli.CommandLine;
  
  /**
   * Utils to commandline.
   */
  public class CommandLineUtils {
  
      public static Optional<String> getOptionalStringArg(CommandLine cmdline, String arg) {
          if (cmdline.hasOption(arg)) {
              return Optional.of(cmdline.getOptionValue(arg));
          } else {
              return Optional.empty();
          }
      }
  
      public static Optional<Boolean> getOptionalBooleanArg(CommandLine cmdline, String arg) {
          if (cmdline.hasOption(arg)) {
              return Optional.of(true);
          } else {
              return Optional.empty();
          }
      }
  
      public static Optional<Integer> getOptionalIntegerArg(CommandLine cmdline, String arg)
              throws IllegalArgumentException {
          try {
              if (cmdline.hasOption(arg)) {
                  return Optional.of(Integer.parseInt(cmdline.getOptionValue(arg)));
              } else {
                  return Optional.empty();
              }
          } catch (NumberFormatException ex) {
              throw new IllegalArgumentException(arg + " is not a number");
          }
      }
  
  }
  