src/main/kotlin/de/uapcore/lightpit/dao/AbstractChildEntityDao.kt

/*
 * Copyright 2020 Mike Becker. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

package de.uapcore.lightpit.dao


abstract class AbstractChildEntityDao<T, P> : AbstractDao<T>() {

    /**
     * Lists all entities being a child of the specified parent.
     * @param parent the parent
     * @return the list of child instances
     */
    abstract fun list(parent: P): List<T>

    /**
     * Finds an entity by its integer ID.
     * It is not guaranteed that referenced entities are automatically joined.
     *
     * @param id the id
     * @return the entity or null if there is no such entity
     */
    abstract fun find(id: Int): T?

    /**
     * Inserts an instance into database.
     * It is not guaranteed that generated fields will be updated in the instance.
     *
     * @param instance the instance to insert
     * @param parent a reference to the parent
     */
    abstract fun save(instance: T, parent: P)

    /**
     * Updates an instance in the database.
     *
     * @param instance the instance to update
     * @return true if an instance has been updated, false if the instance is not present in database
     */
    abstract fun update(instance: T): Boolean
}