After more investigation I found out that the problem is eventually in the
XmlDb API.
Xindice wants to register three databases: "xindice, xindice-embed,
xindice-corba". That's the value the getName method returns. The
DatabaseManager takes this name as a key for the hashtable. Consequently one
database object is registered with one single key.
When I want to gain access to a collection I give "xindice-embed" as part of
the URI. Since the DatabaseManager has not record with this key (only with
"xindice, xindice-embed, xindice-corba") it returns null. :-(
The solution:
- define the format of the getName method in the case of multiple
implementations (e.g. the names must be separated by a ',' or a space)
- when registring a database, split the name according to the separator and
store one instance per separator in the hashtable.
- when deregistring a database, go through all the keys and remove the instance
from the hashtable.
here the code:
public static void registerDatabase (Database database) throws
XMLDBException {
if ((database.getName() == null) || (database.getName().equals(""))) {
throw new XMLDBException(ErrorCodes.INVALID_DATABASE);
}
StringTokenizer st = new StringTokenizer(database.getName(), ",");
while (st.hasMoreTokens()) {
String token = st.nextToken();
databases.put(token.trim(), database);
}
}
public static void deregisterDatabase (Database database)
throws XMLDBException {
StringTokenizer st = new StringTokenizer(database.getName(), ",");
while (st.hasMoreTokens()) {
String token = st.nextToken();
databases.remove(token.trim());
}
}
Of course you can choose another separator than ',' and check is a database is
already registered.
-Vladimir
--
Vladimir Bossicard
www.bossicard.com
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