UnitizedDoubleParser.java

package org.andork.unit;

import java.text.CharacterIterator;
import java.util.function.Function;
import java.util.function.Supplier;
import java.util.function.ToDoubleFunction;

public class UnitizedDoubleParser<T extends UnitType<T>> implements Function<CharacterIterator, UnitizedDouble<T>> {
	ToDoubleFunction<CharacterIterator> doubleParser;
	Function<CharacterIterator, Unit<T>> unitParser;
	Supplier<Unit<T>> defaultUnit;

	public UnitizedDoubleParser(ToDoubleFunction<CharacterIterator> doubleParser,
			Function<CharacterIterator, Unit<T>> unitParser, Supplier<Unit<T>> defaultUnit) {
		super();
		this.doubleParser = doubleParser;
		this.unitParser = unitParser;
		this.defaultUnit = defaultUnit;
	}

	@Override
	public UnitizedDouble<T> apply(CharacterIterator t) {
		double value = doubleParser.applyAsDouble(t);
		if (Double.isNaN(value)) {
			return null;
		}

		Unit<T> unit = unitParser.apply(t);
		if (unit == null) {
			unit = defaultUnit.get();
		}

		return new UnitizedDouble<>(value, unit);
	}
}