java-oxide 0.1.0

Glue code to accompany `java-oxide-gen` for binding to JVM APIs from Rust
Documentation 
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use crate::{Global, Local, Null, Ref, ReferenceType};
use jni_sys::*;
use std::ptr::null_mut;

#[doc(hidden)]
// You should generally not be interacting with this type directly, but it must be public for codegen.
/// By implementing this you assert that you're constructing a valid jvalue for the given argument type (e.g. valid
/// jobject pointer if the function is supposed to take a jobject)
pub unsafe trait AsJValue {
    fn as_jvalue(&self) -> jvalue;
}

unsafe impl AsJValue for bool {
    fn as_jvalue(&self) -> jvalue {
        jvalue {
            z: if *self { JNI_TRUE } else { JNI_FALSE },
        }
    }
}
unsafe impl AsJValue for jbyte {
    fn as_jvalue(&self) -> jvalue {
        jvalue { b: *self }
    }
}
unsafe impl AsJValue for jchar {
    fn as_jvalue(&self) -> jvalue {
        jvalue { c: *self }
    }
}
unsafe impl AsJValue for jshort {
    fn as_jvalue(&self) -> jvalue {
        jvalue { s: *self }
    }
}
unsafe impl AsJValue for jint {
    fn as_jvalue(&self) -> jvalue {
        jvalue { i: *self }
    }
}
unsafe impl AsJValue for jlong {
    fn as_jvalue(&self) -> jvalue {
        jvalue { j: *self }
    }
}
unsafe impl AsJValue for jfloat {
    fn as_jvalue(&self) -> jvalue {
        jvalue { f: *self }
    }
}
unsafe impl AsJValue for jdouble {
    fn as_jvalue(&self) -> jvalue {
        jvalue { d: *self }
    }
}

// do NOT implement, no guarantee any given jobject is actually safe!
// unsafe impl AsJValue for jobject  { fn as_jvalue(&self) -> jvalue { jvalue { l: *self } } }

unsafe impl<T: AsJValue> AsJValue for &T {
    fn as_jvalue(&self) -> jvalue {
        T::as_jvalue(self)
    }
}

unsafe impl<T: AsJValue> AsJValue for &mut T {
    fn as_jvalue(&self) -> jvalue {
        T::as_jvalue(self)
    }
}

unsafe impl AsJValue for Null {
    fn as_jvalue(&self) -> jvalue {
        jvalue { l: null_mut() }
    }
}

unsafe impl<T: ReferenceType> AsJValue for Ref<'_, T> {
    fn as_jvalue(&self) -> jvalue {
        jvalue { l: self.as_raw() }
    }
}

unsafe impl<T: ReferenceType> AsJValue for Option<Ref<'_, T>> {
    fn as_jvalue(&self) -> jvalue {
        match self {
            None => jvalue { l: null_mut() },
            Some(inner) => inner.as_jvalue(),
        }
    }
}

unsafe impl<T: ReferenceType> AsJValue for Option<&Ref<'_, T>> {
    fn as_jvalue(&self) -> jvalue {
        match self {
            None => jvalue { l: null_mut() },
            Some(inner) => inner.as_jvalue(),
        }
    }
}

unsafe impl<T: ReferenceType> AsJValue for Local<'_, T> {
    fn as_jvalue(&self) -> jvalue {
        jvalue { l: self.as_raw() }
    }
}

unsafe impl<T: ReferenceType> AsJValue for Option<Local<'_, T>> {
    fn as_jvalue(&self) -> jvalue {
        match self {
            None => jvalue { l: null_mut() },
            Some(inner) => inner.as_jvalue(),
        }
    }
}

unsafe impl<T: ReferenceType> AsJValue for Option<&Local<'_, T>> {
    fn as_jvalue(&self) -> jvalue {
        match self {
            None => jvalue { l: null_mut() },
            Some(inner) => inner.as_jvalue(),
        }
    }
}

unsafe impl<T: ReferenceType> AsJValue for Global<T> {
    fn as_jvalue(&self) -> jvalue {
        jvalue { l: self.as_raw() }
    }
}

unsafe impl<T: ReferenceType> AsJValue for Option<Global<T>> {
    fn as_jvalue(&self) -> jvalue {
        match self {
            None => jvalue { l: null_mut() },
            Some(inner) => inner.as_jvalue(),
        }
    }
}

unsafe impl<T: ReferenceType> AsJValue for Option<&Global<T>> {
    fn as_jvalue(&self) -> jvalue {
        match self {
            None => jvalue { l: null_mut() },
            Some(inner) => inner.as_jvalue(),
        }
    }
}