driver-legacy/src/main/com/mongodb/QueryBuilder.java
@SuppressWarnings("unchecked")
    public QueryBuilder or(final DBObject... ors) {
        List l = (List) _query.get(QueryOperators.OR);
        if (l == null) {
            l = new ArrayList();
            _query.put(QueryOperators.OR, l);
        }
        Collections.addAll(l, ors);
        return this;
    }
@SuppressWarnings("unchecked")
    public QueryBuilder or(final DBObject... ors) {
        List l = (List) _query.get(QueryOperators.OR);
        if (l == null) {
            l = new ArrayList();
            _query.put(QueryOperators.OR, l);
        }
        Collections.addAll(l, ors);
        return this;
    }
Equivalent to an $or operand

@param ors the list of conditions to or together
@return {@code this}