content: //
  // Licensed to the Apache Software Foundation (ASF) under one
  // or more contributor license agreements.  See the NOTICE file
  // distributed with this work for additional information
  // regarding copyright ownership.  The ASF licenses this file
  // to you under the Apache License, Version 2.0 (the
  // "License"); you may not use this file except in compliance
  // with the License.  You may obtain a copy of the License at
  //
  //   http://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing,
  // software distributed under the License is distributed on an
  // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  // KIND, either express or implied.  See the License for the
  // specific language governing permissions and limitations
  // under the License.
  //
  package com.cloud.api.query;
  
  import java.util.ArrayList;
  import java.util.List;
  
  import com.cloud.exception.InvalidParameterValueException;
  import com.cloud.utils.component.ManagerBase;
  import com.cloud.utils.db.SearchCriteria;
  
  public class MutualExclusiveIdsManagerBase extends ManagerBase {
  
      /***
       * Include ids list in query criteria if ids is not null
       * @param sc search criteria, class type SearchCriteria<Z>
       * @param ids ids list, class type List<T>
       */
      protected <Z,T> void setIdsListToSearchCriteria(SearchCriteria<Z> sc, List<T> ids){
          if (ids != null && !ids.isEmpty()) {
              sc.setParameters("idIN", ids.toArray());
          }
      }
  
      /***
       * Mutually exclusive parameters id and ids for API calls.<br/>
       * Retrieve a list of ids or a list containing id depending on which of them is not null, or null if both are null
       * @param id entity id, class type T
       * @param ids entities ids, class type List<T>
       * @return if id is not null return a list containing id else return ids, if both parameters are null -> return null
       * @throws InvalidParameterValueException - if id and ids are both not null
       */
      protected <T> List<T> getIdsListFromCmd(T id, List<T> ids){
          List<T> idsList = null;
          if (id != null) {
              if (ids != null && !ids.isEmpty()) {
                  throw new InvalidParameterValueException("Specify either id or ids but not both parameters");
              }
              idsList = new ArrayList<T>();
              idsList.add(id);
          } else {
              idsList = ids;
          }
          return idsList;
      }
  }
  