Re: [Mibble-users] Reverse usage of mibble

[Per Cederberg]

On Fri, 2004-04-02 at 05:52, delphiVcl wrote:
> hi，per
> My email has been changed .
> I have received no email since 2004/03/18.
> on http://mail.gnu.org/archive/html/mibble-users/2004-03/msg00016.html I find 
> your answer to my email .

The last post to the list (before yours that is) was my answer.
I guess that explains why you didn't get any mail from the list.

> For example , I try to translate "1.3.6.1.2.1.1.1.0" to "sysDescr.0".

I think I understand the issue. Thing is, if you haven't defined
a symbol corresponding to sysDescr.0 in the MIB (like 
sysDescrEntry or similar), the method I sent to the list will
return null. It only returns symbols on *exact* matches. It will
NOT return parent (or ancestor) symbols.

In your case, I think you are really looking for this (minus any
compilation errors):

    public MibValueSymbol findSymbolByOid(String oid,
                                          boolean exact) {
        MibValueSymbol  sym;
        int             pos;
        int             value;

        sym = this.getSymbolByValue(oid);
        if (sym == null) {
            pos = oid.lastIndexOf(".");
            if (pos > 0) {
                sym = findSymbolByOid(oid.substring(0, pos), true);
                if (sym != null) {
                    value = Integer.parseInt(oid.substring(pos + 1));
                    sym = findSymbolChild(sym, value, exact);
                } else if (!exact) {
                   sym = findSymbolByOid(oid.substring(0, pos), false);
                }
            }
        }
        return sym;
   }

   public MibValueSymbol findSymbolChild(MibValueSymbol sym,
                                         int value,
                                         boolean exact) {
       ObjectIdentifierValue  oid;

       if (!(sym.getValue() instanceof ObjectIdentifierValue)) {
           return null;
       }
       oid = (ObjectIdentifierValue) sym.getValue();
       for (int i = 0; i < oid.getChildCount(); i++) {
           if (oid.getChild(i).getValue() == value) {
               return oid.getChild(i).getSymbol();
           }
       }
       if (oid.getChildCount() == 1) {
           return oid.getChild(0).getSymbol();
       } else if (!exact) {
           return sym;
       } else {
           return null;
       }
   }

You'd call the above with findSymbolByOid(oid, false), whereas
a lot of other people would probably like exact matches (using
true). If you're using non-exact matches, you will get the last
matching ancestor to the oid, which might be "enterprise" or
something like that if you're unlucky...

Note that I had to change the findSymbolByOid() method in order
to correctly handle cases like "1.2.3.4" only finding a match on
"1.2" and thereafter skipping any further attempts at matching.
The code is not the most efficient and I'll probably improve it
a bit before including it in the next Mibble release.

Hope this version suits you better!

Cheers,

/Per