pollymc/libraries/launcher/org/prismlauncher/EntryPoint.java

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// SPDX-License-Identifier: GPL-3.0-only
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/*
* Prism Launcher - Minecraft Launcher
* Copyright (C) 2022 icelimetea <fr3shtea@outlook.com>
* Copyright (C) 2022 TheKodeToad <TheKodeToad@proton.me>
* Copyright (C) 2022 solonovamax <solonovamax@12oclockpoint.com>
*
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* 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.
*
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* 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.
*
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* 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;
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import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.nio.charset.StandardCharsets;
import org.prismlauncher.exception.ParseException;
import org.prismlauncher.launcher.Launcher;
import org.prismlauncher.launcher.impl.StandardLauncher;
import org.prismlauncher.launcher.impl.legacy.LegacyLauncher;
import org.prismlauncher.utils.Parameters;
import org.prismlauncher.utils.logging.Log;
public final class EntryPoint {
public static void main(String[] args) {
ExitCode code = listen();
if (code != ExitCode.NORMAL) {
Log.fatal("Exiting with " + code);
System.exit(code.numeric);
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}
}
private static ExitCode listen() {
Parameters params = new Parameters();
PreLaunchAction action = PreLaunchAction.PROCEED;
try (BufferedReader reader = new BufferedReader(new InputStreamReader(System.in, StandardCharsets.UTF_8))) {
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String line;
while (action == PreLaunchAction.PROCEED) {
if ((line = reader.readLine()) != null)
action = parseLine(line, params);
else
action = PreLaunchAction.ABORT;
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}
} catch (IllegalArgumentException e) {
Log.fatal("Aborting due to wrong argument", e);
return ExitCode.ILLEGAL_ARGUMENT;
} catch (Throwable e) {
Log.fatal("Aborting due to exception", e);
return ExitCode.ABORT;
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}
if (action == PreLaunchAction.ABORT) {
Log.fatal("Launch aborted by the launcher");
return ExitCode.ABORT;
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}
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try {
Launcher launcher;
String type = params.getString("launcher");
switch (type) {
case "standard":
launcher = new StandardLauncher(params);
break;
case "legacy":
launcher = new LegacyLauncher(params);
break;
default:
throw new IllegalArgumentException("Invalid launcher type: " + type);
}
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launcher.launch();
return ExitCode.NORMAL;
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} catch (IllegalArgumentException e) {
Log.fatal("Illegal argument", e);
return ExitCode.ILLEGAL_ARGUMENT;
} catch (Throwable e) {
Log.fatal("Exception caught from launcher", e);
return ExitCode.ERROR;
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}
}
private static PreLaunchAction parseLine(String input, Parameters params) throws ParseException {
switch (input) {
case "":
break;
case "launch":
return PreLaunchAction.LAUNCH;
case "abort":
return PreLaunchAction.ABORT;
default:
String[] pair = input.split(" ", 2);
if (pair.length != 2)
throw new ParseException(input, "[key] [value]");
params.add(pair[0], pair[1]);
}
return PreLaunchAction.PROCEED;
}
private enum PreLaunchAction {
PROCEED, LAUNCH, ABORT
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}
private enum ExitCode {
NORMAL(0), ABORT(1), ERROR(2), ILLEGAL_ARGUMENT(65);
private final int numeric;
ExitCode(int numeric) {
this.numeric = numeric;
}
}
}