Re: [Tm4j-developers] Merge utility now uses TopicMapProvider; possible URI resolution issue in TopicMapProviderBase

[Florian G. H. <fg...@bk...>]

Hello,

On Friday 07 June 2002 16:40, Kal Ahmed wrote:
| This lack of source URL is a big hole in the InputStream interface IMHO=
=2E
| But given that we can't change that (unless anyone knows a developer in=
 the
| Java team ;-), then I think that there needs to be some default rules f=
or
| assigning a URL to the stream. I propose that :
|
| 1) each file can be assigned a base url with a parameter following the =
file
| name:
| org.tm4j.topicmap.cmd.Merge -o output.xtm foo.xtm -baseurl
| http://www.mysite.com/tms/foo.xtm bar.xtm -baseurl
| http://www.mysite.com/tms/bar.xtm
| This has the advantage that I can use local copies of the files for the
| merge process yet still have them treated as if they originated from th=
e
| online sources.

Good idea, but it can't be done using JArgs (as far as I know). So we wou=
ld=20
throw out much of the flexibility we've gained using JArgs by having to w=
rite=20
our own parsing routine again. Or is there an alternative to JArgs which =
does=20
support the structure you propose?=20

| 2) if no base url is specified and the input source is specified on the
| command line generate the URL from the input file name, so "foo.xtm" wo=
uld
| be resolved as a File then you can use File.toURL() to get a locator fo=
r
| the input source. "http://someurl.com/foo.xtm" would fail to resolve as=
 a
| file, so you could convert that to a URL, get the URLConnection for the
| source and use the URL itself as the base url
|
| 3) if no base url is specified and the input source comes from a pipe, =
then
| use some default URL  (could it be based on the current working directo=
ry
| ?)

OK, but TopicMapProviderBase doesn't support any of that yet. It needs an=
=20
overloaded readTopicMap() method which accepts and InputStream and a Stri=
ng=20
representing a system ID.

Still, even if it's useless, I suggest that we at least drop Sun a note t=
hat=20
something like a URLConnectionInputStream is more than needed. We're prob=
ably=20
just a few out of thousands, but at least it's worth telling them.

Later,
-- Florian

--=20
Florian G. Haas <fg...@bk...>

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