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use std::marker::PhantomData;

use sys::jfieldID;

/// Wrapper around `sys::jfieldid` that adds a lifetime. This prevents it from
/// outliving the context in which it was acquired and getting GC'd out from
/// under us. It matches C's representation of the raw pointer, so it can be
/// used in any of the extern function argument positions that would take a
/// `jfieldid`.
#[repr(C)]
#[derive(Copy, Clone)]
pub struct JFieldID<'a> {
    internal: jfieldID,
    lifetime: PhantomData<&'a ()>,
}

impl<'a> From<jfieldID> for JFieldID<'a> {
    fn from(other: jfieldID) -> Self {
        JFieldID {
            internal: other,
            lifetime: PhantomData,
        }
    }
}

impl<'a> JFieldID<'a> {
    /// Unwrap to the internal jni type.
    pub fn into_inner(self) -> jfieldID {
        self.internal
    }
}