Trait robusta_jni::convert::safe::TryFromJavaValue

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>;
}

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
}

Associated Types

type Source: JavaValue<'env>

Conversion source type.

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Associated Constants

const SIG_TYPE: &'static str

Signature of the target type. By default, use the one defined on the Signature trait for the implementing type.

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Required methods

fn try_from(s: Self::Source, env: &'borrow JNIEnv<'env>) -> Result<Self>

Perform the conversion.

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Implementations on Foreign Types

impl<'env: 'borrow, 'borrow> TryFromJavaValue<'env, 'borrow> for String

type Source = JString<'env>

fn try_from(s: Self::Source, env: &'borrow JNIEnv<'env>) -> Result<Self>

impl<'env: 'borrow, 'borrow> TryFromJavaValue<'env, 'borrow> for bool

type Source = jboolean

fn try_from(s: Self::Source, _env: &JNIEnv<'env>) -> Result<Self>

impl<'env: 'borrow, 'borrow> TryFromJavaValue<'env, 'borrow> for char

type Source = jchar

fn try_from(s: Self::Source, _env: &JNIEnv<'env>) -> Result<Self>

impl<'env: 'borrow, 'borrow> TryFromJavaValue<'env, 'borrow> for Box<[bool]>

type Source = jbooleanArray

fn try_from(s: Self::Source, env: &'borrow JNIEnv<'env>) -> Result<Self>

impl<'env: 'borrow, 'borrow, T, U> TryFromJavaValue<'env, 'borrow> for Vec<T> where
    T: TryFromJavaValue<'env, 'borrow, Source = U>,
    U: JavaValue<'env>, 

type Source = JObject<'env>

fn try_from(s: Self::Source, env: &'borrow JNIEnv<'env>) -> Result<Self>

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Implementors

impl<'env: 'borrow, 'borrow, T> TryFromJavaValue<'env, 'borrow> for T where
    T: JavaValue<'env> + Signature, 

type Source = T

fn try_from(s: Self::Source, env: &'borrow JNIEnv<'env>) -> Result<Self>

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