Dynamic search by entites with inheritance

Question

In my service I created abstract class ShapeEntity with two abstract methods.

@Entity
@Inheritance(strategy = TABLE_PER_CLASS)
public abstract class ShapeEntity {
    @Id
    private String id = UUID.randomUUID().toString();

    public abstract double getArea();

    public abstract double getPerimeter();
}

Other entites inherit id and methods, but have own parameters like for example radius or width:

@Entity
@Table(name = "circles")
public class CircleEntity extends ShapeEntity {
    private Double radius;

    @Override
    public double getArea() {
        return Math.PI * Math.pow(2, radius);
    }

    @Override
    public double getPerimeter() {
        return 2 * Math.PI * radius;
    }
}

@Entity
@Table(name = "squares")
public class SquareEntity extends ShapeEntity {
    private double width;

    @Override
    public double getArea() {
        return width * width;
    }

    @Override
    public double getPerimeter() {
        return 4 * width;
    }
}

and now I am working at get all objects with some parameters. I would like to make something like findAll() with parameters for example area, type, and radius, width.

I tried with: tkaczmarzyk / specification-arg-resolver but when I put radius as request parameter I am getting error:

"Unable to locate Attribute  with the the given name [radius] on this ManagedType [com.example.ShapeEntity]; nested exception is java.lang.IllegalArgumentException: Unable to locate Attribute  with the the given name [radius] on this ManagedType [com.example.ShapeEntity]" becouse it can not find field in ShapeEntity (what is obvious).

So is there any other way to make dynamic earch by request parameters? Can I do it by one findAll() method with some parameters?

I can do it with many if / else loops but I think it will not be the best solution. The second problem is what if I add rectangle (RectangleEntity) which has width too.. I would like to inlcude every shape which has given width so searching should be through squares and rectangles.

Dynamic search by entites with inheritance

0 Answers0