package org.multimc;/* * Copyright 2012-2021 MultiMC Contributors * * 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. */ import org.multimc.exception.ParseException; import org.multimc.utils.ParamBucket; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.nio.charset.StandardCharsets; import java.util.logging.Level; import java.util.logging.Logger; public final class EntryPoint { private static final Logger LOGGER = Logger.getLogger("EntryPoint"); private final ParamBucket params = new ParamBucket(); private String launcherType; public static void main(String[] args) { EntryPoint listener = new EntryPoint(); int retCode = listener.listen(); if (retCode != 0) { LOGGER.info("Exiting with " + retCode); System.exit(retCode); } } private Action parseLine(String inData) throws ParseException { String[] tokens = inData.split("\\s+", 2); if (tokens.length == 0) throw new ParseException("Unexpected empty string!"); switch (tokens[0]) { case "launch": { return Action.Launch; } case "abort": { return Action.Abort; } case "launcher": { if (tokens.length != 2) throw new ParseException("Expected 2 tokens, got " + tokens.length); launcherType = tokens[1]; return Action.Proceed; } default: { if (tokens.length != 2) throw new ParseException("Error while parsing:" + inData); params.add(tokens[0], tokens[1]); return Action.Proceed; } } } public int listen() { Action action = Action.Proceed; try (BufferedReader reader = new BufferedReader(new InputStreamReader( System.in, StandardCharsets.UTF_8 ))) { String line; while (action == Action.Proceed) { if ((line = reader.readLine()) != null) { action = parseLine(line); } else { action = Action.Abort; } } } catch (IOException | ParseException e) { LOGGER.log(Level.SEVERE, "Launcher ABORT due to exception:", e); return 1; } // Main loop if (action == Action.Abort) { LOGGER.info("Launch aborted by the launcher."); return 1; } if (launcherType != null) { try { Launcher launcher = LauncherFactory .getInstance() .createLauncher(launcherType, params); launcher.launch(); return 0; } catch (IllegalArgumentException e) { LOGGER.log(Level.SEVERE, "Wrong argument.", e); return 1; } catch (Exception e) { LOGGER.log(Level.SEVERE, "Exception caught from launcher.", e); return 1; } } LOGGER.log(Level.SEVERE, "No valid launcher implementation specified."); return 1; } private enum Action { Proceed, Launch, Abort } }