pollymc/libraries/launcher/org/prismlauncher/EntryPoint.java
solonovamax 99d9868116 Cleanup EntryPoint code
- Don't return an int from listen(). An enum is preferred.
- Make parseLine() static, and pass Parameters to it.

Signed-off-by: solonovamax <solonovamax@12oclockpoint.com>
2022-11-08 16:25:09 +00:00

179 lines
6.1 KiB
Java

// SPDX-License-Identifier: GPL-3.0-only
/*
* PolyMC - Minecraft Launcher
* Copyright (C) 2022 icelimetea, <fr3shtea@outlook.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, version 3.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* Linking this library statically or dynamically with other modules is
* making a combined work based on this library. Thus, the terms and
* conditions of the GNU General Public License cover the whole
* combination.
*
* As a special exception, the copyright holders of this library give
* you permission to link this library with independent modules to
* produce an executable, regardless of the license terms of these
* independent modules, and to copy and distribute the resulting
* executable under terms of your choice, provided that you also meet,
* for each linked independent module, the terms and conditions of the
* license of that module. An independent module is a module which is
* not derived from or based on this library. If you modify this
* library, you may extend this exception to your version of the
* library, but you are not obliged to do so. If you do not wish to do
* so, delete this exception statement from your version.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
* This file incorporates work covered by the following copyright and
* permission notice:
*
* Copyright 2013-2021 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.
*/
package org.prismlauncher;
import org.prismlauncher.exception.ParseException;
import org.prismlauncher.launcher.Launcher;
import org.prismlauncher.launcher.LauncherFactory;
import org.prismlauncher.utils.Parameters;
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 Parameters params = new Parameters();
public static void main(String[] args) {
EntryPoint listener = new EntryPoint();
ExitCode exitCode = listener.listen();
if (exitCode != ExitCode.NORMAL) {
LOGGER.warning("Exiting with " + exitCode);
System.exit(exitCode.numericalCode);
}
}
private static PreLaunchAction parseLine(String inData, Parameters params) throws ParseException {
if (inData.isEmpty())
throw new ParseException("Unexpected empty string!");
String first = inData;
String second = null;
int splitPoint = inData.indexOf(' ');
if (splitPoint != -1) {
first = first.substring(0, splitPoint);
second = inData.substring(splitPoint + 1);
}
switch (first) {
case "launch":
return PreLaunchAction.LAUNCH;
case "abort":
return PreLaunchAction.ABORT;
default:
if (second == null || second.isEmpty())
throw new ParseException("Error while parsing:" + inData);
params.add(first, second);
return PreLaunchAction.PROCEED;
}
}
public ExitCode listen() {
PreLaunchAction preLaunchAction = PreLaunchAction.PROCEED;
try (BufferedReader reader = new BufferedReader(new InputStreamReader(
System.in,
StandardCharsets.UTF_8
))) {
String line;
while (preLaunchAction == PreLaunchAction.PROCEED) {
if ((line = reader.readLine()) != null) {
preLaunchAction = parseLine(line, this.params);
} else {
preLaunchAction = PreLaunchAction.ABORT;
}
}
} catch (IOException | ParseException e) {
LOGGER.log(Level.SEVERE, "Launcher abort due to exception:", e);
return ExitCode.ERROR;
}
// Main loop
if (preLaunchAction == PreLaunchAction.ABORT) {
LOGGER.info("Launch aborted by the launcher.");
return ExitCode.ERROR;
}
try {
Launcher launcher = LauncherFactory.createLauncher(params);
launcher.launch();
return ExitCode.NORMAL;
} catch (IllegalArgumentException e) {
LOGGER.log(Level.SEVERE, "Wrong argument.", e);
return ExitCode.ERROR;
} catch (Throwable e) {
LOGGER.log(Level.SEVERE, "Exception caught from launcher.", e);
return ExitCode.ERROR;
}
}
private enum PreLaunchAction {
PROCEED,
LAUNCH,
ABORT
}
private enum ExitCode {
NORMAL(0),
ERROR(1);
private final int numericalCode;
ExitCode(int numericalCode) {
this.numericalCode = numericalCode;
}
}
}