feat: added uuid feature

Cargo.lock

@@ -58,6 +58,7 @@ version = "0.1.3"
 dependencies = [
  "jni",
  "jni-toolbox-macro 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "uuid",
 ]
 
 [[package]]
@@ -156,6 +157,12 @@ version = "1.0.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e91b56cd4cadaeb79bbf1a5645f6b4f8dc5bde8834ad5894a8db35fda9efa1fe"
 
+[[package]]
+name = "uuid"
+version = "1.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "81dfa00651efa65069b0b6b651f4aaa31ba9e3c3ce0137aaad053604ee7e0314"
+
 [[package]]
 name = "walkdir"
 version = "2.5.0"

Cargo.toml

@@ -15,3 +15,4 @@ edition = "2021"
 [dependencies]
 jni-toolbox-macro = "0.1.3"
 jni = "0.21"
+uuid = { version = "1.10", optional = true }

src/lib.rs

@@ -72,6 +72,26 @@ impl<'j, T: FromJava<'j, T = jni::objects::JObject<'j>>> FromJava<'j> for Option
 	}
 }
 
+#[cfg(feature = "uuid")]
+impl<'j> FromJava<'j> for uuid::Uuid {
+	type T = jni::objects::JObject<'j>;
+	fn from_java(env: &mut jni::JNIEnv<'j>, uuid: Self::T) -> Result<Self, jni::errors::Error> {
+		let lsb = u64::from_ne_bytes(
+			env.call_method(&uuid, "getLeastSignificantBits", "()J", &[])?
+				.j()?
+				.to_ne_bytes()
+		);
+
+		let msb = u64::from_ne_bytes(
+			env.call_method(&uuid, "getMostSignificantBits", "()J", &[])?
+				.j()?
+				.to_ne_bytes()
+		);
+		
+		Ok(uuid::Uuid::from_u64_pair(msb, lsb))
+	}
+}
+
 pub trait IntoJava<'j> {
 	type T;
 
@@ -142,3 +162,16 @@ impl<'j, T: IntoJava<'j, T = jni::sys::jobject>> IntoJava<'j> for Option<T> {
 		}
 	}
 }
+
+#[cfg(feature = "uuid")]
+impl<'j> IntoJava<'j> for uuid::Uuid {
+	type T = jni::sys::jobject;
+	fn into_java(self, env: &mut jni::JNIEnv<'j>) -> Result<Self::T, jni::errors::Error> {
+		let class = env.find_class("java/util/UUID")?;
+		let (msb, lsb) = self.as_u64_pair();
+		let msb = i64::from_ne_bytes(msb.to_ne_bytes());
+		let lsb = i64::from_ne_bytes(lsb.to_ne_bytes());
+		env.new_object(&class, "(JJ)V", &[jni::objects::JValueGen::Long(msb), jni::objects::JValueGen::Long(lsb)])
+			.map(|j| j.as_raw())
+	}
+}