private static boolean checkWalkFinished(OID targetOID, PDU pdu, VariableBinding vb) {
    boolean finished = false;
    if (pdu.getErrorStatus() != 0) {
        finished = true;
    } else if (vb.getOid() == null) {
        finished = true;
    } else if (vb.getOid().size() < targetOID.size()) {
        finished = true;
    } else if (targetOID.leftMostCompare(targetOID.size(), vb.getOid()) != 0) {
        finished = true;
    } else if (Null.isExceptionSyntax(vb.getVariable().getSyntax())) {
        finished = true;
    } else if (vb.getOid().compareTo(targetOID) <= 0) {
        finished = true;
    }
    return finished;

}
 

private static boolean checkWalkFinished(OID targetOID, PDU pdu, VariableBinding vb) {
    boolean finished = false;
    if (pdu.getErrorStatus() != 0) {
        finished = true;
    } else if (vb.getOid() == null) {
        finished = true;
    } else if (vb.getOid().size() < targetOID.size()) {
        finished = true;
    } else if (targetOID.leftMostCompare(targetOID.size(), vb.getOid()) != 0) {
        finished = true;
    } else if (Null.isExceptionSyntax(vb.getVariable().getSyntax())) {
        finished = true;
    } else if (vb.getOid().compareTo(targetOID) <= 0) {
        finished = true;
    }
    return finished;

}
 

@Override
public void get(final SubRequest request) {
    final OID oid = request.getVariableBinding().getOid();
    final Variable variable = variableBindings.get(oid);
    if (variable == null) {
        request.getVariableBinding().setVariable(Null.noSuchInstance);
    } else {
        request.getVariableBinding().setVariable((Variable) variable.clone());
    }
    request.completed();
}
 

@Override
public boolean next(final SubRequest request) {
    final MOScope scope = request.getQuery().getScope();
    final SortedMap<OID, Variable> tail = variableBindings.tailMap(scope.getLowerBound());
    OID first = tail.firstKey();
    if (scope.getLowerBound().equals(first) && !scope.isLowerIncluded()) {
        if (tail.size() > 1) {
            final Iterator<OID> it = tail.keySet().iterator();
            it.next();
            first = it.next();
        } else {
            return false;
        }
    }
    if (first != null) {
        final Variable variable = variableBindings.get(first);
        // TODO remove try / catch if no more errors occur
        // TODO add configuration check with types though (e.g. UInt32 == UInt32 Modifier?)
        try {
            if (variable == null) {
                request.getVariableBinding().setVariable(Null.noSuchInstance);
            } else {
                request.getVariableBinding().setVariable((Variable) variable.clone());
            }
            request.getVariableBinding().setOid(first);
        } catch (IllegalArgumentException e) {
            if (variable != null) {
                log.error("error occurred on variable class " + variable.getClass().getName() + " with first OID " + first.toDottedString(), e);
            }
        }
        request.completed();
        return true;
    }
    return false;
}