MethodHandleUtils.java

package com.rwtema.funkylocomotion.helper;

import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.reflect.Method;
import net.minecraftforge.fml.relauncher.ReflectionHelper.UnableToFindMethodException;

public class MethodHandleUtils
{
	public static class UnableToFindMethodHandleException extends RuntimeException
	{
		private static final long serialVersionUID = 1L;

		public UnableToFindMethodHandleException(String[] methodNames, Exception failed)
		{
			super(failed);
		}
	}

	public static <E> MethodHandle getMethodHandleVirtual(Class<? super E> clazz, String[] methodNames, Class<?>... paramTypes)
	{
		Exception failed = null;

		try
		{
			Method method = reflectMethod(clazz, methodNames, paramTypes);
			MethodHandle handle = MethodHandles.lookup().unreflect(method);
			method.setAccessible(false);
			return handle;
		}
		catch (IllegalAccessException e)
		{
			failed = e;
		}

		throw new UnableToFindMethodHandleException(methodNames, failed);
	}

	public static <E> Method reflectMethod(Class<? super E> clazz, String[] methodNames, Class<?>... methodTypes)
	{
		Exception failed = null;

		for (String methodName : methodNames)
		{
			try
			{
				Method m = clazz.getDeclaredMethod(methodName, methodTypes);
				m.setAccessible(true);
				return m;
			}
			catch (Exception e)
			{
				failed = e;
			}
		}

		throw new UnableToFindMethodException(methodNames, failed);
	}
}