sdk/sources/android-25/com/android/commands/svc/Svc.java

   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
  17 package com.android.commands.svc;
  18
  19 public 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             new UsbCommand(),
  99             new NfcCommand(),
 100     };
 101 }