List constructor ?

[dflachbart]

Is there an easy way to create a List (instead of a set) ?

The DataUnion respects the order, but it doesnt seem to allow duplicates, a list = DataUnion(1,2,3,2,1) only results in [1,2,3]

I know that I could use

list = new_java_util_ArrayList()
java_util_List_add(list, "1")
java_util_List_add(list, "2")
java_util_List_add(list, "1")

but I wonder if there is an easier way to initialize a list.
Also, the above java code only works with strings, but not with integer ...

I probably could find something in one of the various imports, but maybe someone can point me to an example more quickly ...

Thanks,
Dirk

[GKusnick]

I don't know of a more concise way to do what you want, short of writing your own constructor function in Java.

That would also solve your string-v.-int problem by letting you declare the argument types explicit as int. (I've noticed that Sage has trouble passing ints where Objects are expected.)

[malore]

Something like this might meet your needs.
list = java_lang_String_split("1,2,3,2,1",",")

[dflachbart]

Originally Posted by malore

Something like this might meet your needs.
list = java_lang_String_split("1,2,3,2,1",",")

Yeah, this seems to be the best way to do it. Would still require some conversion in case I need Integer, but that's probably the best you can do without external java ...


Thanks for all answers,

Dirk

[Opus4]

I won't claim to be a list expert (and once created a DataUnion of a fixed length of numbers 1-10 just to get an array that size, which I could then fill with the real data at set locations), but SageTV will usually automatically convert from one data type to another. If you have "3" as a string, you can multiple it by the number 2 in order to get 6 as a result. In fact, I use this in various places when I need to use a property as a numerical value -- multiply it by 1 to get a number instead of a string.

- Andy

[dflachbart]

Originally Posted by Opus4

I won't claim to be a list expert (and once created a DataUnion of a fixed length of numbers 1-10 just to get an array that size, which I could then fill with the real data at set locations), but SageTV will usually automatically convert from one data type to another. If you have "3" as a string, you can multiple it by the number 2 in order to get 6 as a result. In fact, I use this in various places when I need to use a property as a numerical value -- multiply it by 1 to get a number instead of a string.

- Andy

Yeah true, that's what I meant with 'still requires conversion'. I have seen this technique many times in existing code (first wondered 'what the hell is this supposed to do ...' ) Just wanted to point out that you have to remember to explicitly convert, otherwise GetElement(list, 0) + GetElement(list, 1) will not really add some numbers ...

Dirk