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feat: auto from/into impls, blanket Option<> impl

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This commit is contained in:
əlemi 2024-09-22 01:37:03 +02:00
parent 95eb528549
commit 3a09386878
Signed by: alemi
GPG key ID: A4895B84D311642C
1 changed files with 77 additions and 62 deletions
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139
src/lib.rs
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@ -1,4 +1,4 @@
use jni::objects::JString;
use jni::objects::JObject;
pub use jni_toolbox_macro::jni;
pub trait JniToolboxError: std::error::Error {
@ -27,8 +27,24 @@ pub trait FromJava<'j> : Sized {
fn from_java(env: &mut jni::JNIEnv<'j>, value: Self::T) -> Result<Self, jni::errors::Error>;
}
macro_rules! auto_from_java {
($t:ty, $j:ty) => {
impl<'j> FromJava<'j> for $t {
type T = $j;
#[inline]
fn from_java(_: &mut jni::JNIEnv, value: Self::T) -> Result<Self, jni::errors::Error> {
Ok(value)
}
}
};
}
auto_from_java!(i64, jni::sys::jlong);
auto_from_java!(i32, jni::sys::jint);
auto_from_java!(i16, jni::sys::jshort);
auto_from_java!(f32, jni::sys::jfloat);
auto_from_java!(f64, jni::sys::jdouble);
impl<'j> FromJava<'j> for bool {
type T = jni::sys::jboolean;
@ -39,51 +55,6 @@ impl<'j> FromJava<'j> for bool {
}
}
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>;
@ -93,36 +64,80 @@ impl<'j> FromJava<'j> for String {
}
}
impl<'j> FromJava<'j> for Option<String> {
type T = jni::objects::JString<'j>;
impl<'j, T: FromJava<'j, T = jni::objects::JObject<'j>>> FromJava<'j> for Option<T> {
type T = jni::objects::JObject<'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)?))
Ok(Some(T::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>;
macro_rules! auto_into_java {
($t:ty, $j:ty) => {
impl<'j> IntoJava<'j> for $t {
type T = $j;
fn into_java(self, _: &mut jni::JNIEnv<'j>) -> Result<Self::T, jni::errors::Error> {
Ok(self)
}
}
};
}
fn into_java(self, env: &mut jni::JNIEnv<'j>) -> Result<Self::T, jni::errors::Error> {
env.new_string(self)
auto_into_java!(i64, jni::sys::jlong);
auto_into_java!(i32, jni::sys::jint);
auto_into_java!(i16, jni::sys::jshort);
auto_into_java!(f32, jni::sys::jfloat);
auto_into_java!(f64, jni::sys::jdouble);
auto_into_java!((), ());
impl<'j> IntoJava<'j> for bool {
type T = jni::sys::jboolean;
#[inline]
fn into_java(self, _: &mut jni::JNIEnv) -> Result<Self::T, jni::errors::Error> {
Ok(if self { 1 } else { 0 })
}
}
impl<'j> IntoJava<'j> for String {
type T = jni::sys::jstring;
fn into_java(self, env: &mut jni::JNIEnv<'j>) -> Result<Self::T, jni::errors::Error> {
Ok(env.new_string(self)?.as_raw())
}
}
impl<'j> IntoJava<'j> for Vec<String> {
type T = jni::sys::jobjectArray;
fn into_java(self, env: &mut jni::JNIEnv<'j>) -> Result<Self::T, jni::errors::Error> {
let mut array = env.new_object_array(self.len() as i32, "java/lang/String", JObject::null())?;
for (n, el) in self.into_iter().enumerate() {
let string = env.new_string(el)?;
env.set_object_array_element(&mut array, n as i32, string)?;
}
Ok(array.into_raw())
}
}
impl<'j, T: IntoJava<'j, T = jni::sys::jobject>> IntoJava<'j> for Option<T> {
type T = T::T;
fn into_java(self, env: &mut jni::JNIEnv<'j>) -> Result<Self::T, jni::errors::Error> {
match self {
Some(x) => x.into_java(env),
None => Ok(std::ptr::null_mut()),
}
}
}