tests/jmap.rs

#![cfg(feature = "invocation")]

use jni::objects::{JMap, JObject, JString};

mod util;
use util::{attach_current_thread, unwrap};

#[test]
pub fn jmap_push_and_iterate() {
    let mut env = attach_current_thread();
    let data = &["hello", "world", "from", "test"];

    // Create a new map. Use LinkedHashMap to have predictable iteration order
    let map_object = unwrap(env.new_object("java/util/LinkedHashMap", "()V", &[]), &env);
    let map = unwrap(JMap::from_env(&mut env, &map_object), &env);

    // Push all strings
    unwrap(
        data.iter().try_for_each(|s| {
            env.new_string(s)
                .map(JObject::from)
                .and_then(|s| map.put(&mut env, &s, &s).map(|_| ()))
        }),
        &env,
    );

    // Collect the keys using the JMap iterator
    let mut collected = Vec::new();
    unwrap(
        map.iter(&mut env).and_then(|mut iter| {
            while let Some(e) = iter.next(&mut env)? {
                let s = JString::from(e.0);
                let s = env.get_string(&s)?;
                collected.push(String::from(s));
            }
            Ok(())
        }),
        &env,
    );

    let orig = data.to_vec();
    assert_eq!(orig, collected);
}