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

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// SPDX-License-Identifier: GPL-3.0-only
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/*
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* PolyMC - Minecraft Launcher
* Copyright (C) 2022 icelimetea, <fr3shtea@outlook.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.utils.Parameters;
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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 {
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private static final Logger LOGGER = Logger.getLogger("EntryPoint");
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private final Parameters params = new Parameters();
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public static void main(String[] args) {
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EntryPoint listener = new EntryPoint();
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int retCode = listener.listen();
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if (retCode != 0) {
LOGGER.info("Exiting with " + retCode);
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System.exit(retCode);
}
}
private Action parseLine(String inData) throws ParseException {
if (inData.length() == 0)
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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 Action.LAUNCH;
case "abort":
return Action.ABORT;
default:
if (second == null || second.isEmpty())
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throw new ParseException("Error while parsing:" + inData);
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params.add(first, second);
return Action.PROCEED;
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}
}
public int listen() {
Action action = Action.PROCEED;
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try (BufferedReader reader = new BufferedReader(new InputStreamReader(
System.in,
StandardCharsets.UTF_8
))) {
String line;
while (action == Action.PROCEED) {
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if ((line = reader.readLine()) != null) {
action = parseLine(line);
} else {
action = Action.ABORT;
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}
}
} catch (IOException | ParseException e) {
LOGGER.log(Level.SEVERE, "Launcher abort due to exception:", e);
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return 1;
}
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// Main loop
if (action == Action.ABORT) {
LOGGER.info("Launch aborted by the launcher.");
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return 1;
}
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try {
Launcher launcher = LauncherFactory.createLauncher(params);
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launcher.launch();
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return 0;
} catch (IllegalArgumentException e) {
LOGGER.log(Level.SEVERE, "Wrong argument.", e);
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return 1;
} catch (Throwable e) {
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LOGGER.log(Level.SEVERE, "Exception caught from launcher.", e);
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return 1;
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}
}
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private enum Action {
PROCEED,
LAUNCH,
ABORT
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}
}