67 lines
2.0 KiB
Java
67 lines
2.0 KiB
Java
/*
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* Copyright (C) 2019 The Dagger Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package dagger.example.atm;
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import dagger.example.atm.Command.Result;
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import dagger.example.atm.Command.Status;
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import java.util.Arrays;
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import java.util.List;
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import java.util.Map;
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import javax.inject.Inject;
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/** Routes individual text commands to the appropriate {@link Command}(s). */
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final class CommandRouter {
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private final Map<String, Command> commands;
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private final Outputter outputter;
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@Inject
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CommandRouter(Map<String, Command> commands, Outputter outputter) {
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this.commands = commands;
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this.outputter = outputter;
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}
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/**
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* Calls {@link Command#handleInput(String) command.handleInput(input)} on this router's
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* {@linkplain #commands commands}.
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*/
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Result route(String input) {
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List<String> splitInput = split(input);
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if (splitInput.isEmpty()) {
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return invalidCommand(input);
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}
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String commandKey = splitInput.get(0);
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Command command = commands.get(commandKey);
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if (command == null) {
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return invalidCommand(input);
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}
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List<String> args = splitInput.subList(1, splitInput.size());
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Result result = command.handleInput(args);
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return result.status().equals(Status.INVALID) ? invalidCommand(input) : result;
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}
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private Result invalidCommand(String input) {
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outputter.output(String.format("couldn't understand \"%s\". please try again.", input));
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return Result.invalid();
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}
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private static List<String> split(String input) {
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return Arrays.asList(input.trim().split("\\s+"));
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}
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}
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