Trait robusta_jni::convert::safe::TryFromJavaValue
source · [−]pub trait TryFromJavaValue<'env: 'borrow, 'borrow> where
Self: Sized + Signature, {
type Source: JavaValue<'env>;
const SIG_TYPE: &'static str;
fn try_from(s: Self::Source, env: &'borrow JNIEnv<'env>) -> Result<Self>;
}Expand description
Conversion trait from Java values to Rust values, analogous to TryFrom. Used when converting types that are input to JNI-available functions.
This is the default trait used when converting values from Java to Rust.
Notes on the derive macro
When using the derive macro, the deriving struct must have a AutoLocal field annotated with both 'env and 'borrow lifetimes and a #[instance] attribute.
This fields keeps a local reference to the underlying Java object.
All other fields are automatically initialized from fields on the Java instance with the same name.
Example:
use robusta_jni::convert::{Signature, TryFromJavaValue};
use robusta_jni::jni::objects::AutoLocal;
#[derive(Signature, TryFromJavaValue)]
#[package()]
struct A<'env: 'borrow, 'borrow> {
#[instance]
raw: AutoLocal<'env, 'borrow>,
foo: i32
}