java-recipe-manager/src/main/lombok/org/leumasjaffe/recipe/viewmodel/ScaleFactor.java

package org.leumasjaffe.recipe.viewmodel;

import org.leumasjaffe.observer.Observable;
import org.leumasjaffe.recipe.model.RecipeCard;

import lombok.AccessLevel;
import lombok.Getter;
import lombok.Setter;
import lombok.experimental.FieldDefaults;

@FieldDefaults(level=AccessLevel.PRIVATE)
public class ScaleFactor extends Observable.Instance {
	@Setter RecipeCard model = null;
	@Getter @Setter int outputServings;
	
	public double getScale() {
		return (model == null || outputServings == 0) ? 1.0 :
			outputServings / (double) model.getServings();
	}
}