EventProxyTransformer.java
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/*
* This file is part of LiteLoader.
* Copyright (C) 2012-16 Adam Mummery-Smith
* All Rights Reserved.
*/
package com.mumfrey.liteloader.transformers.event;
import org.spongepowered.asm.lib.Opcodes;
import org.spongepowered.asm.lib.tree.ClassNode;
import org.spongepowered.asm.lib.tree.InsnNode;
import org.spongepowered.asm.lib.tree.MethodNode;
import com.mumfrey.liteloader.core.runtime.Obf;
import com.mumfrey.liteloader.transformers.ClassTransformer;
/**
* Transformer responsible for transforming/generating the EventProxy inner
* classes, separated from the Event Transformer itself so that we can place it
* higher up the tranformer chain to avoid broken mod transformers screwing
* things up.
*
* @author Adam Mummery-Smith
*/
public class EventProxyTransformer extends ClassTransformer
{
public EventProxyTransformer()
{
}
@Override
public byte[] transform(String name, String transformedName, byte[] basicClass)
{
if (transformedName != null && transformedName.startsWith(Obf.EventProxy.name))
{
int dollarPos = transformedName.indexOf('$');
int proxyIndex = (dollarPos > -1) ? Integer.parseInt(transformedName.substring(dollarPos + 1)) : 0;
if (proxyIndex != 1)
{
try
{
return this.transformEventProxy(transformedName, basicClass, proxyIndex);
}
catch (Throwable th)
{
th.printStackTrace();
}
}
}
return basicClass;
}
private byte[] transformEventProxy(String transformedName, byte[] basicClass, int proxyIndex)
{
ClassNode classNode = this.getProxyByteCode(transformedName, basicClass, proxyIndex);
return this.writeClass(Event.populateProxy(classNode, proxyIndex == 0 ? 1 : proxyIndex));
}
private ClassNode getProxyByteCode(String transformedName, byte[] basicClass, int proxyIndex)
{
if (proxyIndex == 0 || basicClass != null)
{
ClassNode classNode = this.readClass(basicClass, true);
for (MethodNode method : classNode.methods)
{
// Strip the sanity code out of the EventProxy class initialiser
if ("<clinit>".equals(method.name))
{
method.instructions.clear();
method.instructions.add(new InsnNode(Opcodes.RETURN));
}
}
return classNode;
}
ClassNode classNode = new ClassNode();
classNode.visit(50, Opcodes.ACC_PUBLIC | Opcodes.ACC_STATIC, transformedName.replace('.', '/'), null, "java/lang/Object", null);
return classNode;
}
}