CactiChameleon9/PrismLauncher
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A lot more cleanup

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Signed-off-by: TheKodeToad <TheKodeToad@proton.me>
This commit is contained in:
TheKodeToad
2022-11-08 17:51:18 +00:00
parent f2ca9a6b31
commit 32c2ad2bbd
20 changed files with 417 additions and 861 deletions
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103
libraries/launcher/org/prismlauncher/utils/ReflectionUtils.java
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@ -1,7 +1,6 @@
// SPDX-License-Identifier: GPL-3.0-only
/*
* Prism Launcher
*
* Prism Launcher - Minecraft Launcher
* Copyright (C) 2022 icelimetea <fr3shtea@outlook.com>
* Copyright (C) 2022 solonovamax <solonovamax@12oclockpoint.com>
* Copyright (C) 2022 TheKodeToad <TheKodeToad@proton.me>
@ -67,68 +66,57 @@ import org.prismlauncher.utils.logging.Log;
public final class ReflectionUtils {
private ReflectionUtils() {
}
private static final MethodHandles.Lookup LOOKUP = MethodHandles.lookup();
private static final ClassLoader LOADER = ClassLoader.getSystemClassLoader();
/**
* Instantiate an applet class by name
* Construct a Java applet by its class name.
*
* @param appletClassName The name of the applet class to resolve
*
* @return The instantiated applet class
*
* @throws ClassNotFoundException if the provided class name cannot be found
* @throws NoSuchMethodException if the no-args constructor cannot be found
* @throws IllegalAccessException if the constructor cannot be accessed via
* method handles
* @throws Throwable any exceptions from the class's constructor
* @param clazz The class name
* @return The applet instance
* @throws Throwable
*/
public static Applet createAppletClass(String appletClassName) throws Throwable {
Class<?> appletClass = ClassLoader.getSystemClassLoader().loadClass(appletClassName);
public static Applet createAppletClass(String clazz) throws Throwable {
Class<?> appletClass = LOADER.loadClass(clazz);
MethodHandle appletConstructor = MethodHandles.lookup().findConstructor(appletClass,
MethodType.methodType(void.class));
MethodHandle appletConstructor = LOOKUP.findConstructor(appletClass, MethodType.methodType(void.class));
return (Applet) appletConstructor.invoke();
}
/**
* Finds a field that looks like a Minecraft base folder in a supplied class
* Best guess of the game directory field within net.minecraft.client.Minecraft.
* Designed for legacy versions - newer versions do not use a static field.
*
* @param minecraftMainClass the class to scan
*
* @return The found field.
* @param clazz The class
* @return The first field matching criteria
*/
public static Field getMinecraftGameDirField(Class<?> minecraftMainClass) {
public static Field findMinecraftGameDirField(Class<?> clazz) {
Log.debug("Resolving minecraft game directory field");
// Field we're looking for is always
// private static File obfuscatedName = null;
for (Field field : minecraftMainClass.getDeclaredFields()) {
// Has to be File
// search for private static File
for (Field field : clazz.getDeclaredFields()) {
if (field.getType() != File.class) {
continue;
}
int fieldModifiers = field.getModifiers();
// Must be static
if (!Modifier.isStatic(fieldModifiers)) {
Log.debug("Rejecting field " + field.getName() + " because it is not static");
continue;
}
// Must be private
if (!Modifier.isPrivate(fieldModifiers)) {
Log.debug("Rejecting field " + field.getName() + " because it is not private");
continue;
}
// Must not be final
if (Modifier.isFinal(fieldModifiers)) {
Log.debug("Rejecting field " + field.getName() + " because it is final");
continue;
}
Log.debug("Identified field " + field.getName() + " to match conditions for minecraft game directory field");
Log.debug("Identified field " + field.getName() + " to match conditions for game directory field");
return field;
}
@ -137,51 +125,30 @@ public final class ReflectionUtils {
}
/**
* Resolve main entrypoint and returns method handle for it.
* <p>
* Resolves a method that matches the following signature <code>
* public static void main(String[] args) {
* <p>
* }
* </code>
* Gets the main method within a class.
*
* @param entrypointClass The entrypoint class to resolve the method from
*
* @return The method handle for the resolved entrypoint
*
* @throws NoSuchMethodException If no method matching the correct signature
* can be found
* @throws IllegalAccessException If method handles cannot access the entrypoint
* @param clazz The class
* @return A method matching the descriptor of a main method
* @throws ClassNotFoundException
* @throws NoSuchMethodException
* @throws IllegalAccessException
*/
public static MethodHandle findMainEntrypoint(Class<?> entrypointClass)
throws NoSuchMethodException, IllegalAccessException {
return MethodHandles.lookup().findStatic(entrypointClass, "main",
MethodType.methodType(void.class, String[].class));
public static MethodHandle findMainMethod(Class<?> clazz) throws NoSuchMethodException, IllegalAccessException {
return LOOKUP.findStatic(clazz, "main", MethodType.methodType(void.class, String[].class));
}
/**
* Resolve main entrypoint and returns method handle for it.
* <p>
* Resolves a method that matches the following signature <code>
* public static void main(String[] args) {
* <p>
* }
* </code>
* Gets the main method within a class by its name.
*
* @param entrypointClassName The name of the entrypoint class to resolve the
* method from
*
* @return The method handle for the resolved entrypoint
*
* @throws ClassNotFoundException If a class cannot be found with the provided
* name
* @throws NoSuchMethodException If no method matching the correct signature
* can be found
* @throws IllegalAccessException If method handles cannot access the entrypoint
* @param clazz The class name
* @return A method matching the descriptor of a main method
* @throws ClassNotFoundException
* @throws NoSuchMethodException
* @throws IllegalAccessException
*/
public static MethodHandle findMainMethod(String entrypointClassName)
public static MethodHandle findMainMethod(String clazz)
throws ClassNotFoundException, NoSuchMethodException, IllegalAccessException {
return findMainEntrypoint(ClassLoader.getSystemClassLoader().loadClass(entrypointClassName));
return findMainMethod(LOADER.loadClass(clazz));
}
}