Re: Generics pains
Hi,
Joshua Cranmer wrote:
I am trying to create an options class that manages options for a
project. In this class, the options are internally stored as Strings that
can be cast to (depending on circumstances) integers, booleans, or even
enums. However, I am having trouble getting the code to compile:
My suggestiuon (although I am not really sure about it ;-) is this:
class Options
{
private Options()
{
}
private static HashMap<String, String> opts = new HashMap<String,
String>();
private static HashMap<String, Class<?>> types = new HashMap<String,
Class<?>>();
public static String getOption(String name)
{
return opts.get(name);
}
public static <T extends Enum<T>> T getAsEnum(String name)
{
Class<?> c = types.get(name);
if (!c.isEnum())
throw new RuntimeException("Option " + name + " is not an enum!");
@SuppressWarnings("unchecked")
Class<T> ec = (Class<T>) c.asSubclass(Enum.class);
return Enum.valueOf(ec, getOption(name));
}
}
Hth,
Ingo
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