public class Input {

    public int x;

    public int y;

    // More stuff

}

​

public class BaseInput {

    public int x;

    public int y;

    public BaseInput(int x, int y) {

        this.x = x;

        this.y = y;

    }

}

​

public abstract class Base {

    protected static BaseInput validateAndGetAttributes(Input input) {

        if (input.x > 1) {

            throw new Exception("Bad"); 

        }

        if (input.y > 1) {

            throw new Exception("Bad"); 

        }

        return new BaseInput(input.x, input.y);

    }

}

​

public class Concrete1: Base {

    public static Concrete1 GetInstance(Input input) {

        BaseInput baseInput = Base.validateAndGetAttributes(input);

        return new Concrete1(baseInput);

    }

    protected Concrete1(BaseInput input) {

    }

}

​

public class Concrete2: Base {

    public static Concrete2 GetInstance(Input input) {

        BaseInput baseInput = Base.validateAndGetAttributes(input);

        return new Concrete2(baseInput);

    }

    protected Concrete2(BaseInput input) {

    }

}

​

public class Concrete3: Base {

    public static Concrete3 GetInstance(Input input) {

        BaseInput baseInput = Base.validateAndGetAttributes(input);

        return new Concrete3(baseInput);

    }

    protected Concrete3(BaseInput input) {

    }

}

​

​