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

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package org.multimc;/*
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* 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;
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import org.multimc.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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private String launcherType;
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 {
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String[] tokens = inData.split("\\s+", 2);
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if (tokens.length == 0)
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throw new ParseException("Unexpected empty string!");
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switch (tokens[0]) {
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case "launch": {
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return Action.Launch;
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}
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case "abort": {
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return Action.Abort;
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}
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case "launcher": {
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if (tokens.length != 2)
throw new ParseException("Expected 2 tokens, got " + tokens.length);
launcherType = tokens[1];
return Action.Proceed;
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}
default: {
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if (tokens.length != 2)
throw new ParseException("Error while parsing:" + inData);
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params.add(tokens[0], tokens[1]);
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return Action.Proceed;
}
}
}
public int listen() {
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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);
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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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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;
}
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}
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LOGGER.log(Level.SEVERE, "No valid launcher implementation specified.");
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return 1;
}
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private enum Action {
Proceed,
Launch,
Abort
}
}