Struct toad_jni::java::Nullable

pub struct Nullable<T>(_, _);

Helper type that wraps a type T without invoking java::Object::upcast on it, preventing potential NullPointerExceptions.

Implementations

impl<T> Nullable<T>where T: Class,

pub fn into_option(self, e: &mut Env<'_>) -> Option<T>

Convert this to Option<T>, invoking java::Object::upcast only if the object reference is non-null.

Trait Implementations

impl<T> Class for Nullable<T>where T: Class,

const PATH: &'static str = T::PATH

The fully qualified java class path (slash-separated)

impl<T> Object for Nullable<T>where T: Class,

fn upcast(_: &mut Env<'_>, jobj: Object) -> Self

Try to interpret an object as Self

fn downcast(self, _: &mut Env<'_>) -> Object

Create an object reference from self

fn downcast_ref(&self, e: &mut Env<'_>) -> Object

Create an object reference from &self

fn upcast_value_ref<'e>(e: &mut Env<'e>, jv: JValue<'e, '_>) -> Selfwhere Self: Sized,

Try to interpret a JValue as Self

fn upcast_value<'e>(e: &mut Env<'e>, jv: JValueOwned<'e>) -> Selfwhere Self: Sized,

Try to interpret a JValueOwned as Self

fn downcast_value<'e>(self, e: &mut Env<'e>) -> JValueOwned<'e>where Self: Sized,

Create a JValueOwned from self

fn yield_to_java(&self, e: &mut Env<'_>) -> jobject

Use this to yield ownership of a java::lang::Object to the JVM, for example when returning a jobject from a native function.