Svc.java revision f013e1afd1e68af5e3b868c26a653bbfb39538f8 
1/*
2 * Copyright (C) 2008 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.commands.svc;
18
19public class Svc {
20
21    public static abstract class Command {
22        private String mName;
23
24        public Command(String name) {
25            mName = name;
26        }
27
28        public String name() {
29            return mName;
30        }
31
32        public abstract String shortHelp();         // should fit on one short line
33        public abstract String longHelp();          // take as much space as you need, 75 col max
34        public abstract void run(String[] args);    // run the command
35    }
36
37    public static void main(String[] args) {
38        if (args.length >= 1) {
39            Command c = lookupCommand(args[0]);
40            if (c != null) {
41                c.run(args);
42                return;
43            }
44        }
45        COMMAND_HELP.run(args);
46    }
47
48    private static Command lookupCommand(String name) {
49        final int N = COMMANDS.length;
50        for (int i=0; i<N; i++) {
51            Command c = COMMANDS[i];
52            if (c.name().equals(name)) {
53                return c;
54            }
55        }
56        return null;
57    }
58
59    public static final Command COMMAND_HELP = new Command("help") {
60        public String shortHelp() {
61            return "Show information about the subcommands";
62        }
63        public String longHelp() {
64            return shortHelp();
65        }
66        public void run(String[] args) {
67            if (args.length == 2) {
68                Command c = lookupCommand(args[1]);
69                if (c != null) {
70                    System.err.println(c.longHelp());
71                    return;
72                }
73            }
74
75            System.err.println("Available commands:");
76            final int N = COMMANDS.length;
77            int maxlen = 0;
78            for (int i=0; i<N; i++) {
79                Command c = COMMANDS[i];
80                int len = c.name().length();
81                if (maxlen < len) {
82                    maxlen = len;
83                }
84            }
85            String format = "    %-" + maxlen + "s    %s";
86            for (int i=0; i<N; i++) {
87                Command c = COMMANDS[i];
88                System.err.println(String.format(format, c.name(), c.shortHelp()));
89            }
90        }
91    };
92
93    public static final Command[] COMMANDS = new Command[] {
94            COMMAND_HELP,
95            new PowerCommand(),
96            new DataCommand(),
97            new WifiCommand()
98    };
99}
100