prebindgen_jni_runtime/
string_helpers.rs

1//! JNI String conversion helpers for use in type converters and runtime code.
2
3use jni::{
4    objects::{JObject, JString},
5    JNIEnv,
6};
7
8/// Converts a JString into a Rust String.
9///
10/// Used by the String <-> JString converter in primitive_builtins and at runtime.
11pub fn decode_string(env: &mut JNIEnv, string: &JString) -> Result<String, String> {
12    let binding = env
13        .get_string(string)
14        .map_err(|err| format!("Error while retrieving JString: {}", err))?;
15    let value = binding
16        .to_str()
17        .map_err(|err| format!("Error decoding JString: {}", err))?;
18    Ok(value.to_string())
19}
20
21/// Converts a Rust string-like value into a JNI `JString`.
22pub fn encode_string<'local, S: AsRef<str>>(
23    env: &mut JNIEnv<'local>,
24    string: S,
25) -> Result<JString<'local>, String> {
26    env.new_string(string.as_ref())
27        .map_err(|err| format!("Error while encoding JString: {}", err))
28}
29
30/// Returns a null JNI string handle.
31pub fn null_string() -> JString<'static> {
32    JString::from(JObject::null())
33}

prebindgen_jni_runtime/string_helpers.rs

prebindgen_jni_runtime/
string_helpers.rs