om2 0.1.9

A set of classes generated from the OM2 RDF schema (mainly Unit)
Documentation 
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//! Supportive module containing NumericUnion (used mainly in the om2 structs)

use rust_decimal::Decimal;
use rust_decimal::prelude::*;
#[cfg(feature = "with_serde")]
use serde_derive::{Serialize, Deserialize};
use std::{
    convert::From,
    ops::{Add, Sub}
};

/// A datatype that is the union of numeric xsd data types. "numericUnion" is equivalent to the xsd specification that uses an xsd:union of memberTypes="xsd:decimal xsd:double xsd:float xsd:integer".
///
/// ID: http://www.linkedmodel.org/schema/dtype#numericUnion
#[derive(Debug, PartialEq, Clone)]
#[cfg_attr(feature = "with_serde", derive(Serialize, Deserialize))]
pub enum NumericUnion {
    /// decimal represents a subset of the real numbers, which can be represented by decimal numerals.
    #[cfg_attr(feature = "with_serde", serde(rename = "decimal"))]
    Decimal(Decimal),
    /// The double datatype is patterned after the IEEE double-precision 64-bit floating point type [IEEE 754-1985].
    #[cfg_attr(feature = "with_serde", serde(rename = "double"))]
    Double(f64),
    /// float is patterned after the IEEE single-precision 32-bit floating point type [IEEE 754-1985].
    #[cfg_attr(feature = "with_serde", serde(rename = "float"))]
    Float(f32),
    /// integer is ·derived· from decimal by fixing the value of ·fractionDigits· to be 0and disallowing the trailing decimal point.
    #[cfg_attr(feature = "with_serde", serde(rename = "integer"))]
    Integer(i64),
}

macro_rules! math_op {
    ($op:ident, $val1:ident, $val2:ident) => {
        Ok(match $val1 {
            NumericUnion::Decimal(val1) => {
                match $val2 {
                    NumericUnion::Decimal(val2) => {
                        NumericUnion::Decimal(val1.$op(val2))
                    }
                    NumericUnion::Double(val2) => {
                        NumericUnion::Decimal(val1.$op(Decimal::from_f64(val2).ok_or(format!("error converting f64 to Decimal: {}", val2))?))
                    }
                    NumericUnion::Float(val2) => {
                        NumericUnion::Decimal(val1.$op(Decimal::from_f32(val2).ok_or(format!("error converting f32 to Decimal: {}", val2))?))
                    }
                    NumericUnion::Integer(val2) => {
                        NumericUnion::Decimal(val1.$op(Decimal::from_i64(val2).ok_or(format!("error converting i64 to Decimal: {}", val2))?))
                    }
                }
            }
            NumericUnion::Double(val1) => {
                match $val2 {
                    NumericUnion::Decimal(val2) => {
                        NumericUnion::Double(val1.$op(val2.to_f64().ok_or(format!("error converting Decimal to f64"))?))
                    }
                    NumericUnion::Double(val2) => {
                        NumericUnion::Double(val1.$op(val2))
                    }
                    NumericUnion::Float(val2) => {
                        NumericUnion::Double(val1.$op((val2 as f64)))
                    }
                    NumericUnion::Integer(val2) => {
                        NumericUnion::Double(val1.$op((val2 as f64)))
                    }
                }
            }
            NumericUnion::Float(val1) => {
                match $val2 {
                    NumericUnion::Decimal(val2) => {
                        NumericUnion::Float(val1.$op(val2.to_f32().ok_or(format!("error converting Decimal to f32"))?))
                    }
                    NumericUnion::Double(val2) => {
                        NumericUnion::Float(val1.$op((val2 as f32)))
                    }
                    NumericUnion::Float(val2) => {
                        NumericUnion::Float(val1.$op(val2))
                    }
                    NumericUnion::Integer(val2) => {
                        NumericUnion::Float(val1.$op((val2 as f32)))
                    }
                }
            }
            NumericUnion::Integer(val1) => {
                match $val2 {
                    NumericUnion::Decimal(val2) => {
                        NumericUnion::Integer(val1.$op(val2.to_i64().ok_or(format!("error converting Decimal to i64"))?))
                    }
                    NumericUnion::Double(val2) => {
                        NumericUnion::Integer(val1.$op((val2 as i64)))
                    }
                    NumericUnion::Float(val2) => {
                        NumericUnion::Integer(val1.$op((val2 as i64)))
                    }
                    NumericUnion::Integer(val2) => {
                        NumericUnion::Integer(val1.$op(val2))
                    }
                }
            }
        })
    }
}

impl NumericUnion {
    /// Allows adding two NumericUnions
    pub fn add(self, val2: Self) -> Result<Self, String> {
        math_op!{ add, self, val2 }
    }

    /// Allows subtracting two NumericUnions
    pub fn sub(self, val2: Self) -> Result<Self, String> {
        math_op!{ sub, self, val2 }
    }

    /// Determine if this value is zero
    pub fn is_zero(&self) -> bool {
        match self {
            NumericUnion::Decimal(x) => x == &Decimal::zero(),
            NumericUnion::Double(x) => x == &f64::zero(),
            NumericUnion::Float(x) => x == &f32::zero(),
            NumericUnion::Integer(x) => x == &i64::zero(),
        }
    }

    /// Determine if this value is negative
    pub fn is_negative(&self) -> bool {
        match self {
            NumericUnion::Decimal(x) => x < &Decimal::zero(),
            NumericUnion::Double(x) => x < &f64::zero(),
            NumericUnion::Float(x) => x < &f32::zero(),
            NumericUnion::Integer(x) => x < &i64::zero(),
        }
    }
}

impl From<Decimal> for NumericUnion {
    fn from(val: Decimal) -> Self {
        NumericUnion::Decimal(val)
    }
}

impl From<f64> for NumericUnion {
    fn from(val: f64) -> Self {
        NumericUnion::Double(val)
    }
}

impl From<f32> for NumericUnion {
    fn from(val: f32) -> Self {
        NumericUnion::Float(val)
    }
}

impl From<i64> for NumericUnion {
    fn from(val: i64) -> Self {
        NumericUnion::Integer(val)
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn numeric_union_add() {
        let num1 = NumericUnion::Integer(4);
        let num2 = NumericUnion::Decimal(Decimal::new(32, 0));
        assert_eq!(num1.clone().add(num2.clone()).unwrap(), NumericUnion::Integer(36));
        assert_eq!(num2.clone().add(num1.clone()).unwrap(), NumericUnion::Decimal(Decimal::new(360, 1)));

        let num1 = NumericUnion::Double(56.2213);
        let num2 = NumericUnion::Integer(42);
        assert_eq!(num1.clone().add(num2.clone()).unwrap(), NumericUnion::Double(98.2213));
        assert_eq!(num2.clone().add(num1.clone()).unwrap(), NumericUnion::Integer(98));

        let num1 = NumericUnion::Double(56.2213);
        let num2 = NumericUnion::Decimal(Decimal::new(1245, 2));
        assert_eq!(num1.clone().add(num2.clone()).unwrap(), NumericUnion::Double(68.6713));
        assert_eq!(num2.clone().add(num1.clone()).unwrap(), NumericUnion::Decimal(Decimal::new(686713, 4)));
    }

    #[test]
    fn numeric_union_sub() {
        let num1 = NumericUnion::Integer(4);
        let num2 = NumericUnion::Decimal(Decimal::new(32, 0));
        assert_eq!(num1.clone().sub(num2.clone()).unwrap(), NumericUnion::Integer(-28));
        assert_eq!(num2.clone().sub(num1.clone()).unwrap(), NumericUnion::Decimal(Decimal::new(280, 1)));

        let num1 = NumericUnion::Double(56.2213);
        let num2 = NumericUnion::Integer(42);
        assert_eq!(num1.clone().sub(num2.clone()).unwrap(), NumericUnion::Double(14.2213));
        assert_eq!(num2.clone().sub(num1.clone()).unwrap(), NumericUnion::Integer(-14));

        let num1 = NumericUnion::Double(56.2213);
        let num2 = NumericUnion::Decimal(Decimal::new(1245, 2));
        assert_eq!(num1.clone().sub(num2.clone()).unwrap(), NumericUnion::Double(43.7713));
        assert_eq!(num2.clone().sub(num1.clone()).unwrap(), NumericUnion::Decimal(Decimal::new(-437713, 4)));
    }

    #[test]
    fn numeric_union_is_zero() {
        let num1 = NumericUnion::Integer(4);
        let num2 = NumericUnion::Decimal(Decimal::new(32, 0));
        let num3 = NumericUnion::Float(0.0);
        let num4 = NumericUnion::Integer(0);
        let num5 = NumericUnion::Decimal(Decimal::new(555, 0)).sub(NumericUnion::Integer(555)).unwrap();
        assert!(!num1.is_zero());
        assert!(!num2.is_zero());
        assert!(num3.is_zero());
        assert!(num4.is_zero());
        assert!(num5.is_zero());
    }

    #[test]
    fn numeric_union_is_negative() {
        let num1 = NumericUnion::Integer(4);
        let num2 = NumericUnion::Decimal(Decimal::new(32, 0));
        let num3 = num1.clone().sub(num2.clone()).unwrap();
        let num4 = num2.sub(num1).unwrap();
        assert!(num3.is_negative());
        assert!(!num4.is_negative());
    }
}