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 }; 99 } 100
