content: /*
   * Copyright (C) 2012 The Android Open Source Project
   *
   * Licensed 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 com.android.commands.uiautomator;
  
  import android.os.Process;
  
  import java.util.Arrays;
  
  /**
   * Entry point into the uiautomator command line
   *
   * This class maintains the list of sub commands, and redirect the control into it based on the
   * command line arguments. It also prints out help arguments for each sub commands.
   *
   * To add a new sub command, implement {@link Command} and add an instance into COMMANDS array
   */
  public class Launcher {
  
      /**
       * A simple abstraction class for supporting generic sub commands
       */
      public static abstract class Command {
          private String mName;
  
          public Command(String name) {
              mName = name;
          }
  
          /**
           * Returns the name of the sub command
           * @return
           */
          public String name() {
              return mName;
          }
  
          /**
           * Returns a one-liner of the function of this command
           * @return
           */
          public abstract String shortHelp();
  
          /**
           * Returns a detailed explanation of the command usage
           *
           * Usage may have multiple lines, indentation of 4 spaces recommended.
           * @return
           */
          public abstract String detailedOptions();
  
          /**
           * Starts the command with the provided arguments
           * @param args
           */
          public abstract void run(String args[]);
      }
  
      public static void main(String[] args) {
          // show a meaningful process name in `ps`
          Process.setArgV0("uiautomator");
          if (args.length >= 1) {
              Command command = findCommand(args[0]);
              if (command != null) {
                  String[] args2 = {};
                  if (args.length > 1) {
                      // consume the first arg
                      args2 = Arrays.copyOfRange(args, 1, args.length);
                  }
                  command.run(args2);
                  return;
              }
          }
          HELP_COMMAND.run(args);
      }
  
      private static Command findCommand(String name) {
          for (Command command : COMMANDS) {
              if (command.name().equals(name)) {
                  return command;
              }
          }
          return null;
      }
  
      private static Command HELP_COMMAND = new Command("help") {
          @Override
          public void run(String[] args) {
              System.err.println("Usage: uiautomator <subcommand> [options]\n");
              System.err.println("Available subcommands:\n");
              for (Command command : COMMANDS) {
                  String shortHelp = command.shortHelp();
                  String detailedOptions = command.detailedOptions();
                  if (shortHelp == null) {
                      shortHelp = "";
                  }
                  if (detailedOptions == null) {
                      detailedOptions = "";
                  }
                  System.err.println(String.format("%s: %s", command.name(), shortHelp));
                  System.err.println(detailedOptions);
              }
          }
  
          @Override
          public String detailedOptions() {
              return null;
          }
  
          @Override
          public String shortHelp() {
              return "displays help message";
          }
      };
  
      private static Command[] COMMANDS = new Command[] {
          HELP_COMMAND,
          new RunTestCommand(),
          new DumpCommand(),
          new EventsCommand(),
      };
  }