import org.identityconnectors.framework.common.objects.filter.AndFilter; //导入依赖的package包/类
public ScopedFilter translate(AndFilter icfFilter) {
       if (icfFilter == null) {
           return null;
       }
       
       Collection<Filter> icfSubfilters = icfFilter.getFilters();
       List<ExprNode> subNodes = new ArrayList<ExprNode>(icfSubfilters.size());
       Dn baseDn = null;
       
       for (Filter icfSubFilter: icfSubfilters) {
           ScopedFilter subNode = translate(icfSubFilter);
           
           if (subNode.getBaseDn() != null) {
               if ((baseDn != null) && !baseDn.equals(subNode.getBaseDn())) {
                   throw new InvalidAttributeValueException("Two search clauses for DN in one search filter");
               } else {
                   baseDn = subNode.getBaseDn();
               }
           }
           
           if (subNode.getFilter() != null) {
               subNodes.add(subNode.getFilter());
           }
       }
       
       return new ScopedFilter(new AndNode(subNodes), baseDn);
}