/**
* Unset a field referenced by a fpath if it exists, otherwise ignore.
*
* @param fpath dot-separated field path (i.e. 63.2)
* @throws ISOException
*/
public void unset(String fpath) throws ISOException {
StringTokenizer st = new StringTokenizer(fpath, ".");
ISOMsg m = this;
ISOMsg lastm = m;
int fldno = -1;
int lastfldno;
for (; ; ) {
lastfldno = fldno;
fldno = Integer.parseInt(st.nextToken());
if (st.hasMoreTokens()) {
Object obj = m.getValue(fldno);
if (obj instanceof ISOMsg) {
lastm = m;
m = (ISOMsg) obj;
} else {
// No real way of unset further subfield, exit. Perhaps should be ISOException?
break;
}
} else {
m.unset(fldno);
if (m.hasFields() == false && (lastfldno != -1)) {
lastm.unset(lastfldno);
}
break;
}
}
}
