| /** |
| * 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 com.google.common.base.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.absent(); |
| } |
| } |
| |
| public static Optional<Boolean> getOptionalBooleanArg(CommandLine cmdline, String arg) { |
| if (cmdline.hasOption(arg)) { |
| return Optional.of(true); |
| } else { |
| return Optional.absent(); |
| } |
| } |
| |
| 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.absent(); |
| } |
| } catch (NumberFormatException ex) { |
| throw new IllegalArgumentException(arg + " is not a number"); |
| } |
| } |
| |
| } |