Send Java Class as function argument

Question

I want to pass a Java class as argument to a Java method. The method is getKeySpec() of class java.security.KeyFactory:

getKeySpec(Key key, Class<T> keySpec)

The NativeScript Typings for this method is

public getKeySpec(param0: java.security.Key, param1: java.lang.Class<any>): java.security.spec.KeySpec;

How do I pass a java.lang.Class<any> to this method? I want to pass java.security.spec.X509EncodedKeySpec.

This is my current TypeScript code, which fails at the getKeySpec() call.

function getPublicKey(keyPair: java.security.KeyPair): string {
    const kf = java.security.KeyFactory.getInstance("RSA");
    let pubKeySpec = kf.getKeySpec(keyPair.getPublic(), java.security.spec.X509EncodedKeySpec);
    return pubKeySpec.getEncoded();
}

"which fails" can you be more specific about that part? you can't send a "class", you can send either an instance of Class, or an instance of a class. Java has methods, not functions. Then again, it seems this is not java code, so why do you tag it as being Java? — Stultuske
– Stultuske, Commented Sep 21, 2018 at 10:56
The typescript compiler complains with the following: [ts] Argument of type 'typeof X509EncodedKeySpec' is not assignable to parameter of type 'Class<any>'. — ulvesked
– ulvesked, Commented Sep 21, 2018 at 10:58
Aha, seems to be valid according to typescript (which does not complain any more). I will test it later today. — ulvesked
– ulvesked, Commented Sep 21, 2018 at 11:00

Onik · Accepted Answer · 2018-09-21 11:02:17Z

2

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let pubKeySpec = kf.getKeySpec(keyPair.getPublic(), X509EncodedKeySpec.class);

answered Sep 21, 2018 at 11:02

Onik

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