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

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// SPDX-License-Identifier: GPL-3.0-only
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/*
* Prism 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 org.prismlauncher.exception.ParseException;
import org.prismlauncher.launcher.Launcher;
import org.prismlauncher.launcher.LauncherFactory;
import org.prismlauncher.utils.Parameters;
import org.prismlauncher.utils.StringUtils;
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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 EntryPoint() {}
public static void main(String[] args)
{
ExitCode exitCode = listen();
if (exitCode != ExitCode.NORMAL) {
LOGGER.warning("Exiting with " + exitCode);
// noinspection CallToSystemExit
System.exit(exitCode.numericalCode);
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}
}
private static PreLaunchAction parseLine(String input, Parameters params) throws ParseException
{
if (input.isEmpty()) // TODO: 2022-11-01 Should we just ignore this?
throw new ParseException("Unexpected empty string! You should not pass empty newlines to stdin.");
if ("launch".equalsIgnoreCase(input))
return PreLaunchAction.LAUNCH;
else if ("abort".equalsIgnoreCase(input))
return PreLaunchAction.ABORT;
else {
String[] pair = StringUtils.splitStringPair(' ', input);
if (pair == null)
throw new ParseException(String.format(
"Could not split input string '%s' by space. All input provided from stdin must be either 'launch', 'abort', or "
+ "in the format '[param name] [param]'.",
input));
params.add(pair[0], pair[1]);
return PreLaunchAction.PROCEED;
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}
}
private static ExitCode listen()
{
Parameters parameters = new Parameters();
PreLaunchAction preLaunchAction = PreLaunchAction.PROCEED;
try (BufferedReader reader = new BufferedReader(new InputStreamReader(System.in, StandardCharsets.UTF_8))) {
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String line;
while (preLaunchAction == PreLaunchAction.PROCEED) {
// noinspection NestedAssignment
if ((line = reader.readLine()) != null)
preLaunchAction = parseLine(line, parameters);
else
preLaunchAction = PreLaunchAction.ABORT;
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}
} catch (IOException | ParseException e) {
LOGGER.log(Level.SEVERE, "Launcher abort due to exception", e);
return ExitCode.ILLEGAL_ARGUMENT;
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}
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// Main loop
if (preLaunchAction == PreLaunchAction.ABORT) {
LOGGER.info("Launch aborted by the launcher.");
return ExitCode.ABORT;
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}
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try {
Launcher launcher = LauncherFactory.createLauncher(parameters);
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launcher.launch();
return ExitCode.NORMAL;
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} catch (IllegalArgumentException e) {
LOGGER.log(Level.SEVERE, "Wrong argument.", e);
return ExitCode.ILLEGAL_ARGUMENT;
} catch (ClassNotFoundException | NoSuchMethodException | IllegalAccessException e) {
LOGGER.log(Level.SEVERE, "Caught reflection exception from launcher", e);
return ExitCode.REFLECTION_EXCEPTION;
} catch (Throwable e) {
LOGGER.log(Level.SEVERE, "Exception caught from launcher", e);
return ExitCode.ERROR;
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}
}
private enum PreLaunchAction {
PROCEED, LAUNCH, ABORT
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}
private enum ExitCode {
NORMAL(0), ABORT(1), ERROR(2), ILLEGAL_ARGUMENT(3), REFLECTION_EXCEPTION(4);
private final int numericalCode;
ExitCode(int numericalCode) { this.numericalCode = numericalCode; }
}
}