Consider the following abstract class :
public abstract class BuildingBase
{
public abstract BuildingType Type { get; }
}
this class is inherited by two classes :
public class Appartment : BuildingBase
{
public override BuildingType Type => BuildingType.Appartment;
}
public class House: BuildingBase
{
public override BuildingType Type => BuildingType.House;
}
I have a factory that should 'build' based on the type passed :
public class Builder {
public BuildingBase Build(BuildingType type) {
// how to get this implemented without if / else .. case when ... etc
}
}
I'd use generics in this case, like this:
public class Builder
{
public TBuildingBase Build<TBuildingType>()
where TBuildingBase : BuildingBase, new()
{
var result = new TBuildingBase();
...
}
}
But I'm not sure if you require the Enum
as an input. I'm afraid that if you do want to stick with it, your choices are either an if-else construct, a constructor map like @Selvin mentioned, or using reflection (ugh).
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