At runtime, I am trying to verify whether a particular KClass<out Any> is an enum type or not.
What is the best way to do so? Can this be done without relying on a particular runtime (e.g., JVM or JS)?
fun isEnum( type: KClass<out Any> ): Boolean
{
... ?
}
I have this class, defined in one of .NET's framework assemblies:
public class ExternalClass
{
internal double DesiredProperty => 1.0;
}
I derive from ExternalClass and would like to either override or somehow intercept calls to that property. I'm aware that this can get very hacky, but it's really only for a proof-of-concept.
I tried the straightforward way with reflection, but haven't had any luck:
private void DoEvilStuff()
{
var prop = typeof(ExternalClass).GetProperty("DesiredProperty", BindingFlags.Instance | BindingFlags.NonPublic);
// Exception: Property has no setter
prop.SetValue(this, 5);
}
From another answer:
private void DoEvilStuff()
{
var prop = typeof(ExternalClass).GetField("<DesiredProperty>k__BackingField", BindingFlags.Instance | BindingFlags.NonPublic);
// fails, prop is null:
prop.SetValue(this, 5);
}
Is there a way to do this with reflection, or any other method with reasonable small effort? I can (properly) work around this for my actual problem, so a "No" is really an acceptable answer, but I'm curious if this would be possible.
We are working with mvc design pattern, where all the data is stored under map.
I want to iterate over all the classes in the system and for each to check what the method is putting on the map and what does the method get from the map.
For example for the next code:
private void myFunc()
{
Object obj = model.get("mykey");
Object obj2 = model.get("mykey2");
.....
model.put("mykey3", "aaa");
}
I want to know that in this function we have 2 gets: mykey and mykey2 and 1 put: mykey3
How can I do it with the code.
Thanks.
I'm seeing how to get custom annnotation class object from AccessibleObject in java like this.
AccessibleObject m = ...
Named n = m.getAnnotation(Named.class);
But, I don't know, given an java.lang.annotation.Annotation annotation how to convert this into custom class object.
Does java provides any similar utility to do casting?
I'm playing with Ruby to deepen my knowledge and have fun while at the same time improving my knowledge of Esperanto with a just starting toy project called Ĝue. Basically, the aim is to use Ruby facilities to implement a DSL that matches Esperanto traits that I think interesting in the context of a programming language.
So a first trait I would like to implement is inflection of verbs, using infinitive in method declaration (ending with -i), and jussive (ending with -u) for call to the method.
A first working basic implementation is like that:
module Ĝue
def method_missing(igo, *args, &block)
case igo
when /u$/
celo = igo.to_s.sub(/u$/, 'i').to_s
send(celo)
else
super
end
end
end
And it works. Now the next step is to make it more resilient, because there is no guaranty that celo will exists when the module try to call it. That is, the module should implement the respond_to? method. Thus the question, how do the module know if the context where module was required include the corresponding infinitive method? Even after adding extend self at the beginning of the module, inside of the module methods.include? :testi still return false when tested with the following code, although the testu call works perfectly:
#!/usr/bin/env ruby
require './teke/ĝue.rb'
include Ĝue
def testi; puts 'testo!' ;end
testu
Note that the test is run directly into the main scope. I don't know if this makes any difference with using a dedicated class scope, I would guess that know, as to the of my knowledge everything is an object in Ruby.
I've got an instance of an object, which I scan for memberProperties that have a proper annotation attached on them. Then, I want to filter based on their return type. For example if declaration is as follows: class AutoValidatedThing : AutoValidatedUserInputComponent {...} and the target instance contains a @ValidComponent val someProperty: AutoValidatedThing = ..., I'd want to get the someProperty as a AutoValidatedUserInputComponent to the end of the following code block:
val invalidOnes = this::class.memberProperties
.filter { it.javaField != null && it.javaField!!.isAnnotationPresent(ValidComponent::class.java) }
.filter { val annotations = it.javaField?.annotations; annotations != null
&& annotations.map { ann -> ann.annotationClass }.contains(ValidComponent::class)
&& it.returnType is AutoValidatedUserInputComponent }
.map { it.getter.call() as AutoValidatedUserInputComponent }
But it.returnType is AutoValidatedUserInputComponent ALWAYS returns false.
AutoValidatedUserInputComponent is a simple interface:
interface AutoValidatedUserInputComponent {
fun blabla() : SomeType
}
I have sources classes:
@Data
@NoArgsConstructor
@AllArgsConstructor
public class User {
private String name;
private int age;
private Test test;
}
@Data
@NoArgsConstructor
@AllArgsConstructor
public class Test {
private String hz1;
private String hz2;
}
And I have dest classes:
@Data
@NoArgsConstructor
@AllArgsConstructor
public class UserDest {
private String name;
private int age;
private List<TestDest> tests;
}
Data
@NoArgsConstructor
@AllArgsConstructor
public class TestDest {
private String hz1;
private String hz2;
}
I create User and try map it to UserDest:
DozerBeanMapper mapper = new DozerBeanMapper();
User user = new User("Bill", 27, new Test("p1", "p2"));
UserDest userDest = mapper.map(user, UserDest.class);
System.out.println(userDest);
Output: UserDest(name=Bill, age=27, tests=null)
I add Mapping:
mapper.addMapping(new BeanMappingBuilder() {
@Override
protected void configure() {
TypeMappingBuilder mapping = mapping(User.class, UserDest.class);
mapping.fields(field("test.hz1"), field("tests[0].hz1"));
mapping.fields(field("test.hz2"), field("tests[0].hz2"));
}
});
And after that output:
UserDest(name=Bill, age=27, tests=[TestDest(hz1=p1, hz2=p2)])
But I need set each field like this
User test.hz1 set to UserDest tests[0].hz1
I want next:
mapping.fields(field("test"), field("tests[0]"));
But this after that I get this output:
UserDest(name=Bill, age=27, tests=[[]])
How can I set one item from sources class to zero item of list in dest class? Maby some converter or somthing else?