1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.apache.commons.statistics.examples.distribution;
18
19 import java.util.concurrent.Callable;
20 import picocli.CommandLine.Mixin;
21 import picocli.CommandLine.Model.CommandSpec;
22 import picocli.CommandLine.Spec;
23
24 /**
25 * Base command that output the help message.
26 * This is used for commands that have sub-commands.
27 */
28 abstract class AbstractDistributionCommand implements Callable<Void> {
29 /** The command specification. Used to print the usage built by Picocli. */
30 @Spec
31 private CommandSpec spec;
32
33 /** The standard options. */
34 @Mixin
35 private StandardOptions standardOptions;
36
37 @Override
38 public Void call() {
39 // All work is done in sub-commands so just print the usage
40 spec.commandLine().usage(System.out);
41 return null;
42 }
43 }