how to get sub fqn list by specifying the parent fqn?

[sting_hz]

Hi there,

I'm wondering how to get sub fqn list by specifying the parent fqn?

For the following code.

PojoCache cache = BaseCacheManager.getCache();

cache.putObject(new Fqn("a"),null);
cache.putObject(new Fqn("a/b"),null);
cache.putObject(new Fqn("a/c"),null);

Set set1 = cache.getChildrenNames("/");
log.debug("set1:" + set1);
the above debug can print all the three fqn names :
[a, a/b, a/c]

But when I tried to get the sub Fqns under '/a', like this:
Set set2 = cache.getChildrenNames(new Fqn("a"));
log.debug("set2:" + set2);

set2 is only an empty set. only "[]" is printed.

Any one know this issue, please give me a hand, thanks!

Steven Si

[brian.stansberry]

Don't construct an Fqn via the constructor. Do it like this:

cache.putObject(Fqn.fromString("/a"),null);
cache.putObject(Fqn.fromString("/a/b"),null);
cache.putObject(Fqn.fromString("/a/c"),null);

Note the presence of the leading '/'.

The Fqn.fromString() method knows how to parse the string using the '/' separator. The Fqn constructor just assumes whatever object is passed to it is the name.

[sting_hz]

Hi Brian,
Thanks for the quick reply.
Another question is how to get the recursive sub fqn list.

For example, I have
cache.putObject(Fqn.fromString("/a"),null);
cache.putObject(Fqn.fromString("/a/b/c"),null);
cache.putObject(Fqn.fromString("/a/c"),null);

Set set = cache.getChildrenNames(Fqn.fromString("/a"));

Currently the set only contains the direct sub fqn list: [b,c]

How to get the recusive sub fqn list like [b/c, c]


Thanks,

Steven

[brian.stansberry]

There's no simple API to do that; you'd to write a function to walk the tree and call getChildrenNames() at each level.

[sting_hz]

thanks a lot