| /* |
| * Copyright (C) 2019 The Dagger Authors. |
| * |
| * 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 dagger.example.atm; |
| |
| import dagger.example.atm.Command.Result; |
| import dagger.example.atm.Command.Status; |
| import java.util.Arrays; |
| import java.util.List; |
| import java.util.Map; |
| import javax.inject.Inject; |
| |
| /** Routes individual text commands to the appropriate {@link Command}(s). */ |
| final class CommandRouter { |
| private final Map<String, Command> commands; |
| private final Outputter outputter; |
| |
| @Inject |
| CommandRouter(Map<String, Command> commands, Outputter outputter) { |
| this.commands = commands; |
| this.outputter = outputter; |
| } |
| |
| /** |
| * Calls {@link Command#handleInput(String) command.handleInput(input)} on this router's |
| * {@linkplain #commands commands}. |
| */ |
| Result route(String input) { |
| List<String> splitInput = split(input); |
| if (splitInput.isEmpty()) { |
| return invalidCommand(input); |
| } |
| |
| String commandKey = splitInput.get(0); |
| Command command = commands.get(commandKey); |
| if (command == null) { |
| return invalidCommand(input); |
| } |
| |
| List<String> args = splitInput.subList(1, splitInput.size()); |
| Result result = command.handleInput(args); |
| return result.status().equals(Status.INVALID) ? invalidCommand(input) : result; |
| } |
| |
| private Result invalidCommand(String input) { |
| outputter.output(String.format("couldn't understand \"%s\". please try again.", input)); |
| return Result.invalid(); |
| } |
| |
| private static List<String> split(String input) { |
| return Arrays.asList(input.trim().split("\\s+")); |
| } |
| } |