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package org.jetbrains.dokka
import java.lang.reflect.InvocationHandler
import java.lang.reflect.InvocationTargetException
import java.lang.reflect.Method
import java.lang.reflect.Proxy
/**
* Warning! Hard reflection magic used here.
*
* Creates [java.lang.reflect.Proxy] with pass through invocation algorithm,
* to create access proxy for [delegate] into [targetClassLoader].
*/
@Suppress("UNCHECKED_CAST")
inline fun <reified T : Any> automagicTypedProxy(targetClassLoader: ClassLoader, delegate: Any): T =
automagicProxy(targetClassLoader, T::class.java, delegate) as T
/**
* Warning! Hard reflection magic used here.
*
* Creates [java.lang.reflect.Proxy] with pass through invocation algorithm,
* to create access proxy for [delegate] into [targetClassLoader].
*
*/
fun automagicProxy(targetClassLoader: ClassLoader, targetType: Class<*>, delegate: Any): Any =
Proxy.newProxyInstance(
targetClassLoader,
arrayOf(targetType),
DelegatedInvocationHandler(delegate)
)
class DelegatedInvocationHandler(private val delegate: Any) : InvocationHandler {
@Throws(Throwable::class)
override fun invoke(proxy: Any, method: Method, args: Array<Any?>?): Any? {
val delegateMethod = delegate.javaClass.getMethod(method.name, *method.parameterTypes)
try {
delegateMethod.isAccessible = true
return delegateMethod.invoke(delegate, *(args ?: emptyArray()))
} catch (ex: InvocationTargetException) {
throw ex.targetException
}
}
}
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