/
ClassLoadingStrategyChooser.java
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/
ClassLoadingStrategyChooser.java
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package io.mockk.proxy.jvm;
import java.lang.invoke.MethodHandles;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import net.bytebuddy.dynamic.loading.ClassInjector;
import net.bytebuddy.dynamic.loading.ClassLoadingStrategy;
public class ClassLoadingStrategyChooser {
private static final Method PRIVATE_LOOKUP_IN;
private static final Object LOOKUP;
static {
Method privateLookupIn;
Object lookup;
try {
Class<?> methodHandles = Class.forName("java.lang.invoke.MethodHandles");
lookup = methodHandles.getMethod("lookup").invoke(null);
privateLookupIn = methodHandles.getMethod(
"privateLookupIn",
Class.class,
Class.forName("java.lang.invoke.MethodHandles$Lookup")
);
} catch (Exception e) {
privateLookupIn = null;
lookup = null;
}
PRIVATE_LOOKUP_IN = privateLookupIn;
LOOKUP = lookup;
}
public static <T> ClassLoadingStrategy<ClassLoader> chooseClassLoadingStrategy(Class<T> type) {
try {
final ClassLoadingStrategy<ClassLoader> strategy;
if (!type.getName().startsWith("java.") &&
!type.getName().startsWith("javax.") &&
ClassInjector.UsingLookup.isAvailable() &&
PRIVATE_LOOKUP_IN != null && LOOKUP != null) {
Object privateLookup = PRIVATE_LOOKUP_IN.invoke(null, type, LOOKUP);
strategy = ClassLoadingStrategy.UsingLookup.of(privateLookup);
} else if (ClassInjector.UsingReflection.isAvailable()) {
strategy = ClassLoadingStrategy.Default.INJECTION.with(type.getProtectionDomain());
} else {
strategy = ClassLoadingStrategy.Default.WRAPPER.with(type.getProtectionDomain());
}
return strategy;
} catch (InvocationTargetException e) {
throw new IllegalStateException(
"Failed to invoke 'privateLookupIn' method from java.lang.invoke.MethodHandles$Lookup.",
e
);
} catch (IllegalAccessException e) {
throw new IllegalStateException(
"Failed to invoke 'privateLookupIn' method from java.lang.invoke.MethodHandles$Lookup.",
e
);
}
}
}