public SnmpInstId getInstance(SnmpObjId base) {
if (!base.isPrefixOf(this)) return null;
int[] instanceIds = new int[length() - base.length()];
System.arraycopy(m_ids, base.length(), instanceIds, 0, instanceIds.length);
return new SnmpInstId(instanceIds);
}
public boolean isPrefixOf(final SnmpObjId other) {
if (other == null || length() > other.length()) return false;
for (int i = 0; i < m_ids.length; i++) {
if (m_ids[i] != other.m_ids[i]) return false;
}
return true;
}
@Override
public int compareTo(SnmpObjId o) {
if (o == null) throw new NullPointerException("o is null");
SnmpObjId other = (SnmpObjId) o;
// compare each element in order for as much length as they have in common
// which is the entire length of one or both oids
int minLen = Math.min(length(), other.length());
for (int i = 0; i < minLen; i++) {
long diff = toLong(m_ids[i]) - toLong(other.m_ids[i]);
// the first one that is not equal indicates which is bigger
if (diff != 0) {
return diff > 0 ? 1 : -1;
}
}
// if they get to hear then both are identifical for their common length
// so which ever is longer is then greater
return length() - other.length();
}