dev.jorel.commandapi.SafeVarHandle Maven / Gradle / Ivy
package dev.jorel.commandapi;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.VarHandle;
/**
* A wrapper around VarHandle with better type safety using generics and a
* toggleable underlying implementation depending on whether we're using mojang
* mappings or non-mojang mappings
*
* @param
* @param
*/
public class SafeVarHandle {
public static boolean USING_MOJANG_MAPPINGS = false; // This should only be set to true in testing.
private VarHandle handle;
private SafeVarHandle(VarHandle handle) {
this.handle = handle;
}
private static SafeVarHandle of(Class classType, String fieldName, String mojangMappedFieldName, Class fieldType)
throws ReflectiveOperationException {
return new SafeVarHandle<>(
MethodHandles.privateLookupIn(classType, MethodHandles.lookup()).findVarHandle(classType, USING_MOJANG_MAPPINGS ? mojangMappedFieldName : fieldName, fieldType));
}
public static SafeVarHandle ofOrNull(Class classType, String fieldName, String mojangMappedFieldName, Class fieldType) {
try {
return of(classType, fieldName, mojangMappedFieldName, fieldType);
} catch (ReflectiveOperationException e) {
e.printStackTrace();
return null;
}
}
public FieldType get(Type instance) {
return (FieldType) handle.get(instance);
}
public FieldType getStatic() {
return (FieldType) handle.get(null);
}
public void set(Type instance, FieldType param) {
handle.set(instance, param);
}
}