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/*
 * Copyright (c) 2011-2017 Jeppetto and Jonathan Thompson
 *
 * Licensed 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 org.iternine.jeppetto.dao;


/**
 * A GenericDAO is the root interface for DAOs that fit within the Jeppetto framework.  This
 * defines base functionality such as finding a specific entity by its identifier and saving an
 * entity to the underlying data store.
 *
 * @param  Type of entity
 * @param  ID type for the entity.
 */
public interface GenericDAO {

    /**
     * Find an object T with the specified id.
     *
     * @param id of the desired object.
     *
     * @return Object with the specified id
     *
     * @throws NoSuchItemException if the object identified by the id is not found
     * @throws JeppettoException if any other failure occurs
     */
    T findById(ID id)
            throws NoSuchItemException, JeppettoException;


    /**
     * Find objects of type T with the specified ids.
     *
     * @param ids of the desired object.
     *
     * @return Iterable of T
     *
     * @throws JeppettoException if any other failure occurs
     */
    Iterable findByIds(ID... ids)
            throws JeppettoException;


    /**
     * Find all objects of type T.
     *
     * @return Iterable of T
     *
     * @throws JeppettoException if any underlying failure occurs
     */
    Iterable findAll()
            throws JeppettoException;


    /**
     * Call save to insert a new object into the persistent store or update a preexisting object that has
     * been modified.
     *
     * @param entity to save.
     *
     * @throws OptimisticLockException if optimistic locking is enabled and a save is attempted on an already
     *                                 modified object.
     * @throws JeppettoException if any other failure occurs
     */
    void save(T entity)
            throws OptimisticLockException, JeppettoException;


    /**
     * Delete the specified object from the persistent store.
     *
     * @param entity to delete.
     *
     * @throws JeppettoException if any underlying failure occurs
     */
    void delete(T entity)
            throws JeppettoException;


    /**
     * Delete an object from the persistent store based on the id.
     *
     * @param id of the object to delete.
     *
     * @throws JeppettoException if any underlying failure occurs
     */
    void deleteById(ID id)
            throws JeppettoException;


    /**
     * Delete objects from the persistent store based on the passed in id values.
     *
     * @param ids of the objects to delete.
     *
     * @throws FailedBatchException if some (or all) of the ids were not successfully deleted.  The exception
     *                              contains a list of the ids that failed to delete.
     * @throws JeppettoException if any underlying failure occurs
     */
    void deleteByIds(ID... ids)
            throws FailedBatchException, JeppettoException;


    /**
     * Get an object that can be used to capture a set of changes to be applied to one ore more
     * persisted objects.
     *
     * @return An update object that is either a T or a subclass of T
     *
     * @throws JeppettoException if any underlying failure occurs
     */
     U getUpdateObject();


    /**
     * Apply the set of changes described in the update object to the persisted item with the
     * specified id.
     *
     * @param updateObject that describes the set of changes to be applied.
     * @param id of the object to update.
     *
     * @throws JeppettoException if any underlying failure occurs
     */
     T updateById(U updateObject, ID id)
            throws JeppettoException;


    /**
     * Apply the set of changes described in the update object to persisted items with the
     * specified ids.
     *
     * @param updateObject that describes the set of changes to be applied.
     * @param ids of the objects to update.
     *
     * @throws FailedBatchException if some (or all) of the referenced items were not successfully updated.
     *                              The exception contains a list of the ids that failed to update.
     * @throws JeppettoException if any underlying failure occurs
     */
     Iterable updateByIds(U updateObject, ID... ids)
            throws FailedBatchException, JeppettoException;


    /**
     * If the implementation supports lazy writes, manually flush changes to the external database
     *
     * @throws JeppettoException if any underlying failure occurs
     */
    void flush()
            throws JeppettoException;
}