public abstract class Factory<T> where T : PoolingObject
{
    public List<T> GetItems(int count)
    {
        List<T> lineItems = new List<T>();
        for (int i = 0; i < count; i++)
        {
            lineItems.Add(CreateItem());
        }

        return lineItems;
    }

    public abstract T CreateItem();

}

public class PlatformsFactory : Factory<LineItem>
{
    private VerticalLine parent;
    private LineItem prefab;

    public PlatformsFactory(VerticalLine parent, LineItem prefab)
    {
        this.parent = parent;
        this.prefab = prefab;
    }

    public override LineItem CreateItem()
    {
        LineItem lineItem = GameObject.Instantiate(prefab, parent.transform);
        lineItem.Initialize(parent, GetRandomParametrs());
        return lineItem;
    }

    public LineItemParametrs GetRandomParametrs()
    {
        float lenght = Random.Range(4F, 8F);
        int colorId = Random.Range(1, 5);
        LineItemParametrs lineItem = new LineItemParametrs(lenght, colorId);

        return lineItem;
    }

}