/**
    * Copyright 2005-2012 The Kuali Foundation
    *
    * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php
    *
   * 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 org.kuali.rice.krad.service;
  
  import org.kuali.rice.krad.bo.BusinessObject;
  import org.kuali.rice.krad.bo.PersistableBusinessObject;
  
  import java.util.Collection;
  import java.util.List;
  import java.util.Map;
  
  /**
   * This interface defines methods that a BusinessObjectService must provide.
   * 
   * 
   */
  public interface BusinessObjectService {
  
      /**
       * Saves the passed in object via the persistence layer.
       * 
       * This will throw an IllegalArgumentException (runtime exception) if the object passed in is not a descendent of
       * BusinessObject.
       * 
       * @param bo A BusinessObject instance or descendent that you wish to be stored.
       * 
       */
      public <T extends PersistableBusinessObject> T save(T bo);
  
      /**
       * Saves the businessObjects on the list via the persistence layer.
       * 
       * This will throw an IllegalArgumentException (runtime exception) if any of the objects passed in is not a descendent of
       * BusinessObject.
       * 
       * @param businessObjects A List<PersistableBusinessObject> of objects to persist.
       * 
       */
      public List<? extends PersistableBusinessObject> save(List<? extends PersistableBusinessObject> businessObjects);
  
      /**
       * Links up any contained objects, and then Saves the passed in object via the persistence layer.
       * 
       * This will throw an IllegalArgumentException (runtime exception) if the object passed in is not a descendent of
       * BusinessObject.
       * 
       * @param bo A BusinessObject instance or descendent that you wish to be stored.
       * 
       */
      public PersistableBusinessObject linkAndSave(PersistableBusinessObject bo);
  
      /**
       * Links up any contained objects, and Saves the businessObjects on the list via the persistence layer.
       * 
       * This will throw an IllegalArgumentException (runtime exception) if any of the objects passed in is not a descendent of
       * BusinessObject.
       * 
       * @param businessObjects A List<BusinessObject> of objects to persist.
       * 
       */
      public List<? extends PersistableBusinessObject> linkAndSave(List<? extends PersistableBusinessObject> businessObjects);
  
      /**
       * Retrieves an object instance identified by its primary key. For composite keys, use {@link #findByPrimaryKey(Class, Map)}
       * 
       * @param clazz
       * @param primaryKey
       * @return
       */
      public <T extends BusinessObject> T findBySinglePrimaryKey(Class<T> clazz, Object primaryKey);
      
      /**
       * Retrieves an object instance identified by its primary keys and values. This can be done by constructing a map where the key
       * to the map entry is the primary key attribute and the value of the entry being the primary key value. For composite keys,
       * pass in each primaryKey attribute and its value as a map entry.
       * 
       * @param clazz
       * @param primaryKeys
       * @return
       */
      public <T extends BusinessObject> T findByPrimaryKey(Class<T> clazz, Map<String, ?> primaryKeys);
  
      /**
       * Retrieves an object instance identified by the class of the given object and the object's primary key values.
       * 
       * @param object
      * @return
      */
     public PersistableBusinessObject retrieve(PersistableBusinessObject object);
 
     /**
      * Retrieves a collection of business objects populated with data, such that each record in the database populates a new object
      * instance. This will only retrieve business objects by class type.
      * 
      * @param clazz
      * @return
      */
     public <T extends BusinessObject> Collection<T> findAll(Class<T> clazz);
 
     /**
      * Retrieves a collection of business objects populated with data, such that each record in the database populates a new object
      * instance. This will only retrieve business objects by class type.
      * 
      * @param clazz
      * @return
      */
     public <T extends BusinessObject> Collection<T> findAllOrderBy( Class<T> clazz, String sortField, boolean sortAscending );
     
     /**
      * This method retrieves a collection of business objects populated with data, such that each record in the database populates a
      * new object instance. This will retrieve business objects by class type and also by criteria passed in as key-value pairs,
      * specifically attribute name and its expected value.
      * 
      * @param clazz
      * @param fieldValues
      * @return
      */
     public <T extends BusinessObject> Collection<T> findMatching(Class<T> clazz, Map<String, ?> fieldValues);
     
     /**
      * Finds all entities matching the passed in Rice JPA criteria
      * 
      * @param <T> the type of the entity that will be returned
      * @param criteria the criteria to form the query with
      * @return a Collection (most likely a List) of all matching entities 
      */
     //public abstract <T extends BusinessObject> Collection<T> findMatching(Criteria criteria);
 
     /**
      * This method retrieves a count of the business objects populated with data which match the criteria in the given Map.
      * 
      * @param clazz
      * @param fieldValues
      * @return number of businessObjects of the given class whose fields match the values in the given expected-value Map
      */
     public int countMatching(Class clazz, Map<String, ?> fieldValues);
 
     /**
      * This method retrieves a count of the business objects populated with data which match both the positive criteria 
      * and the negative criteria in the given Map.
      * 
      * @param clazz
      * @param positiveFieldValues
      * @param negativeFieldValues
      * @return number of businessObjects of the given class whose fields match the values in the given expected-value Maps
      */
     public int countMatching(Class clazz, Map<String, ?> positiveFieldValues, Map<String, ?> negativeFieldValues);
     
     /**
      * This method retrieves a collection of business objects populated with data, such that each record in the database populates a
      * new object instance. This will retrieve business objects by class type and also by criteria passed in as key-value pairs,
      * specifically attribute name and its expected value. Performs an order by on sort field.
      * 
      * @param clazz
      * @param fieldValues
      * @return
      */
     public <T extends BusinessObject> Collection<T> findMatchingOrderBy(Class<T> clazz, Map<String, ?> fieldValues, String sortField, boolean sortAscending);
 
     /**
      * Deletes a business object from the database.
      * 
      * @param bo
      */
     public void delete(PersistableBusinessObject bo);
 
     /**
      * Deletes each business object in the given List.
      * 
      * @param boList
      */
     public void delete(List<? extends PersistableBusinessObject> boList);
 
     /**
      * Deletes the object(s) matching the given field values
      * 
      * @param clazz
      * @param fieldValues
      */
     public void deleteMatching(Class clazz, Map<String, ?> fieldValues);
 
     /**
      * 
      * This method attempts to retrieve the reference from a BO if it exists.
      * 
      * @param bo - populated BusinessObject instance that includes the referenceName property
      * @param referenceName - name of the member/property to load
      * @return A populated object from the DB, if it exists
      * 
      */
     public BusinessObject getReferenceIfExists(BusinessObject bo, String referenceName);
 
     /**
      * 
      * Updates all KualiUser or Person objects contained within this BO, based on the UserID as the authoritative key. The
      * appropriate foreign-key field in the BO itself is also updated.
      * 
      * This allows UserIDs to be entered on forms, and the back-end will link up correctly based on this non-key field.
      * 
      * @param bo The populated BO (or descendent) instance to be linked & updated
      * 
      */
     public void linkUserFields(PersistableBusinessObject bo);
 
     /**
      * 
      * Updates all KualiUser or Person objects contained within this BO, based on the UserID as the authoritative key. The
      * appropriate foreign-key field in the BO itself is also updated.
      * 
      * This allows UserIDs to be entered on forms, and the back-end will link up correctly based on this non-key field.
      * 
      * @param bos A List of populated BusinessObject (or descendent) instances to be linked & updated.
      */
     public void linkUserFields(List<PersistableBusinessObject> bos);
     
     /**
      * Merges the given business object, but tells the ORM that the object is to be treated as Read Only,
      * and even if it has changes, it will not be persisted to the database 
      * 
      * @param bo the business object to managed
      * @return the managed copied of the business object
      */
     public PersistableBusinessObject manageReadOnly(PersistableBusinessObject bo);
 
 }