jni-toolbox/src/lib.rs

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2024-09-22 00:09:46 +02:00
use jni::objects::JString;
pub use jni_toolbox_macro::jni;
pub trait JniToolboxError: std::error::Error {
fn jclass(&self) -> String;
}
impl JniToolboxError for jni::errors::Error {
fn jclass(&self) -> String {
"java/lang/RuntimeException".to_string()
}
}
impl JniToolboxError for jni::errors::JniError {
fn jclass(&self) -> String {
"java/lang/RuntimeException".to_string()
}
}
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pub fn from_java_static<'j, T: FromJava<'j>>(env: &mut jni::JNIEnv<'j>, val: T::T) -> Result<T, jni::errors::Error> {
T::from_java(env, val)
}
pub trait FromJava<'j> : Sized {
type T : Sized;
fn from_java(env: &mut jni::JNIEnv<'j>, value: Self::T) -> Result<Self, jni::errors::Error>;
}
impl<'j> FromJava<'j> for bool {
type T = jni::sys::jboolean;
#[inline]
fn from_java(_: &mut jni::JNIEnv, value: Self::T) -> Result<Self, jni::errors::Error> {
Ok(value == 1)
}
}
impl<'j> FromJava<'j> for i64 {
type T = jni::sys::jlong;
#[inline]
fn from_java(_: &mut jni::JNIEnv, value: Self::T) -> Result<Self, jni::errors::Error> {
Ok(value)
}
}
impl<'j> FromJava<'j> for i32 {
type T = jni::sys::jint;
#[inline]
fn from_java(_: &mut jni::JNIEnv, value: Self::T) -> Result<Self, jni::errors::Error> {
Ok(value)
}
}
impl<'j> FromJava<'j> for i16 {
type T = jni::sys::jshort;
#[inline]
fn from_java(_: &mut jni::JNIEnv, value: Self::T) -> Result<Self, jni::errors::Error> {
Ok(value)
}
}
impl<'j> FromJava<'j> for f32 {
type T = jni::sys::jfloat;
#[inline]
fn from_java(_: &mut jni::JNIEnv, value: Self::T) -> Result<Self, jni::errors::Error> {
Ok(value)
}
}
impl<'j> FromJava<'j> for f64 {
type T = jni::sys::jdouble;
#[inline]
fn from_java(_: &mut jni::JNIEnv, value: Self::T) -> Result<Self, jni::errors::Error> {
Ok(value)
}
}
impl<'j> FromJava<'j> for String {
type T = jni::objects::JString<'j>;
fn from_java(env: &mut jni::JNIEnv<'j>, value: Self::T) -> Result<Self, jni::errors::Error> {
if value.is_null() { return Err(jni::errors::Error::NullPtr("string can't be null")) };
Ok(env.get_string(&value)?.into())
}
}
impl<'j> FromJava<'j> for Option<String> {
type T = jni::objects::JString<'j>;
fn from_java(env: &mut jni::JNIEnv<'j>, value: Self::T) -> Result<Self, jni::errors::Error> {
if value.is_null() { return Ok(None) };
Ok(Some(String::from_java(env, value)?))
}
}
pub trait IntoJava<'j> {
type T;
fn into_java(self, env: &mut jni::JNIEnv<'j>) -> Result<Self::T, jni::errors::Error>;
}
impl<'j> IntoJava<'j> for String {
type T = JString<'j>;
fn into_java(self, env: &mut jni::JNIEnv<'j>) -> Result<Self::T, jni::errors::Error> {
env.new_string(self)
}
}