Class LegacyClassLoaderCastTransformer

java.lang.Object

com.hloader.launch.LegacyClassLoaderCastTransformer

All Implemented Interfaces:

ClassFileTransformer

public final class LegacyClassLoaderCastTransformer
extends Object
implements ClassFileTransformer

Rewrites (URLClassLoader) someClass.getClassLoader() into a call to ClasspathUrls.wrap() wherever it appears in any loaded class. See ClasspathUrls for why this is needed: pre-1.6 Minecraft boots through net.minecraft.launchwrapper.Launch, whose constructor does exactly this cast to read the classpath, and it throws on Java 9+ since the real system class loader is no longer a URLClassLoader.

Only the specific two-instruction sequence Class.getClassLoader() immediately followed by checkcast java/net/URLClassLoader is touched, so unrelated casts of an already-held URLClassLoader reference elsewhere are left alone.

Constructor Summary

Constructors

Constructor	Description
LegacyClassLoaderCastTransformer()

Method Summary

Modifier and Type	Method	Description
byte[]	transform(ClassLoader loader, String className, Class<?> classBeingRedefined, ProtectionDomain protectionDomain, byte[] classfileBuffer)

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface ClassFileTransformer

transform

Constructor Details

LegacyClassLoaderCastTransformer

public LegacyClassLoaderCastTransformer()

Method Details

transform

public byte[] transform(ClassLoader loader,
 String className,
 Class<?> classBeingRedefined,
 ProtectionDomain protectionDomain,
 byte[] classfileBuffer)

Specified by:

transform in interface ClassFileTransformer