@openhps/core/dist/esm5/utils/unit/DerivedUnit.js

Open Hybrid Positioning System - Core component

import { __decorate } from "tslib";
import { Unit } from './Unit';
import { SerializableObject } from '../../data/decorators';
/**
 * Derived Unit
 * @category Unit
 */
let DerivedUnit = class DerivedUnit extends Unit {
  constructor() {
    super(...arguments);
    this._units = new Map();
    this._unitPower = new Map();
  }
  addUnit(unit, power) {
    if (this._units.has(unit.baseName)) {
      throw new Error(`A unit with base name '${unit.baseName}' already exists for this unit!`);
    }
    this._units.set(unit.baseName, unit);
    this._unitPower.set(unit.baseName, power);
    return this;
  }
  swap(subunits, options) {
    if (Unit.UNITS.has(options.name)) {
      return Unit.UNITS.get(options.name);
    }
    const UnitConstructor = Object.getPrototypeOf(this).constructor;
    const unit = new UnitConstructor();
    unit._name = options.name;
    unit._baseName = this.baseName;
    unit._aliases = options.aliases ? options.aliases : [];
    const definition = {
      unit: this.name,
      toUnit: undefined,
      fromUnit: undefined
    };
    subunits.forEach(subunit => {
      const currentUnit = this._units.get(subunit.baseName);
      const unitPower = this._unitPower.get(subunit.baseName);
      const newDefinition = subunit.createDefinition(currentUnit);
      const newToFn = value => Math.pow(newDefinition.toUnit(value), unitPower);
      const newFromFn = value => Math.pow(newDefinition.fromUnit(value), unitPower);
      const existingToFn = definition.toUnit;
      const existingFromFn = definition.fromUnit;
      if (existingToFn && existingFromFn) {
        definition.toUnit = value => existingToFn(newToFn(value));
        definition.fromUnit = value => existingFromFn(newFromFn(value));
      } else {
        definition.toUnit = newToFn;
        definition.fromUnit = newFromFn;
      }
    });
    unit._definitions.set(this.name, definition);
    return Unit.registerUnit(unit);
  }
};
DerivedUnit = __decorate([SerializableObject()], DerivedUnit);
export { DerivedUnit };