rs4j 0.10.2

A small, automatic, efficient, and easy-to-use Rust to Java bridge.
Documentation 
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//! Type conversions to Java

/// A trait for things that can be converted into Java types.
pub trait IntoJavaType {
    /// Convert this into a [`String`] (java type)
    fn into_java_type(&self) -> String;
}

macro_rules! from_type {
    ($ty: ident, $name: ident) => {
        impl From<$ty> for RustTypes {
            fn from(val: $ty) -> RustTypes {
                RustTypes::$name(val)
            }
        }

        impl Into<$ty> for RustTypes {
            fn into(self) -> $ty {
                if let Self::$name(val) = self {
                    val
                } else {
                    panic!("Expected RustTypes::{}, got {:?}", stringify!($name), self)
                }
            }
        }
    };
}

/// An enum for Rust types.
#[derive(Debug, Clone, PartialEq, PartialOrd, Default)]
pub enum RustTypes {
    /// A [`String`].
    String(String),

    /// A [`bool`].
    Bool(bool),

    /// A [`u8`].
    Uint8(u8),

    /// A [`u16`].
    Uint16(u16),

    /// A [`u32`].
    Uint32(u32),

    /// A [`u64`].
    Uint64(u64),

    /// A [`u128`].
    Uint128(u128),

    /// An [`i8`].
    Int8(i8),

    /// An [`i16`].
    Int16(i16),

    /// An [`i32`].
    Int32(i32),

    /// An [`i64`].
    Int64(i64),

    /// An [`i128`].
    Int128(i128),

    /// A [`f32`].
    Float32(f32),

    /// A [`f64`].
    Float64(f64),

    /// A catch-all, with the type name as a [`String`].
    Other(String),

    /// A void type ([`unit`](https://doc.rust-lang.org/std/primitive.unit.html)).
    #[default]
    Void,
}

from_type!(String, String);
from_type!(bool, Bool);
from_type!(u8, Uint8);
from_type!(u16, Uint16);
from_type!(u32, Uint32);
from_type!(u64, Uint64);
from_type!(u128, Uint128);
from_type!(i8, Int8);
from_type!(i16, Int16);
from_type!(i32, Int32);
from_type!(i64, Int64);
from_type!(i128, Int128);
from_type!(f32, Float32);
from_type!(f64, Float64);

impl From<&str> for RustTypes {
    fn from(val: &str) -> Self {
        match val {
            "String" | "str" => Self::String(String::new()),
            "bool" => Self::Bool(false),
            "i8" => Self::Int8(0),
            "i16" => Self::Int16(0),
            "i32" => Self::Int32(0),
            "i64" => Self::Int64(0),
            "i128" => Self::Int128(0),
            "u8" => Self::Uint8(0),
            "u16" => Self::Uint16(0),
            "u32" => Self::Uint32(0),
            "u64" => Self::Uint64(0),
            "u128" => Self::Uint128(0),
            "f32" => Self::Float32(0.0),
            "f64" => Self::Float64(0.0),
            v => Self::Other(v.to_string()),
        }
    }
}

impl From<()> for RustTypes {
    fn from(_: ()) -> Self {
        Self::Void
    }
}

impl Into<()> for RustTypes {
    fn into(self) -> () {
        if let Self::Void = self {
            ()
        } else {
            panic!("Expected RustTypes::Void, got {:?}", self)
        }
    }
}

impl IntoJavaType for RustTypes {
    fn into_java_type(&self) -> String {
        match self.clone() {
            Self::String(_) => "String".to_string(),
            Self::Bool(_) => "Boolean".to_string(),
            Self::Uint8(_) | Self::Int8(_) => "Byte".to_string(),
            Self::Uint16(_) | Self::Int16(_) => "Short".to_string(),
            Self::Uint32(_) | Self::Int32(_) => "Integer".to_string(),
            Self::Uint64(_) | Self::Int64(_) => "Long".to_string(),
            Self::Uint128(_) | Self::Int128(_) => "java.math.BigInteger".to_string(),
            Self::Float32(_) => "Float".to_string(),
            Self::Float64(_) => "Double".to_string(),
            Self::Other(val) => val,
            Self::Void => "Void".to_string(),
        }
    }
}