org.pau.assetmanager.business.ClientsBusiness.java Source code

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Here is the source code for org.pau.assetmanager.business.ClientsBusiness.java

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/**
 * This file is part of Pau's Asset Manager Project.
 *
 * Pau's Asset Manager Project is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Pau's Asset Manager Project is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Pau's Asset Manager Project.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.pau.assetmanager.business;

import java.util.List;

import javax.persistence.EntityManager;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.pau.assetmanager.entities.Book;
import org.pau.assetmanager.entities.Client;
import org.pau.assetmanager.entities.User;
import org.pau.assetmanager.entities.UserClientAssociation;
import org.pau.assetmanager.utils.AssetManagerRuntimeException;
import org.pau.assetmanager.utils.UserUtil;

import com.google.common.base.Optional;

/**
 * 
 * This class contains database methods related to Clients {@link org.pau.assetmanager.entities.Client}
 * 
 * 
 * @author Pau Carr Cardona
 *
 */

public class ClientsBusiness {

    private static Logger logger = LogManager.getLogger(ClientsBusiness.class);

    /**
     * This method removes a client from the database 
     * 
     * @param selectedClient client to remove
     * 
     * @return the client removed
     */
    public static Client removeClient(Client selectedClient) {
        String queryBooks = "select book from Book book where book.client=:client";
        List<Book> books = DaoFunction.<Book>querySimpleListFunction("client", selectedClient).apply(queryBooks);
        for (Book book : books) {
            BooksBusiness.removeBook(book);
        }
        String queryClients = "select client from Client client where client=:client";
        Optional<Client> optionalClient = DaoFunction.<Client>querySimpleUniqueFunction("client", selectedClient)
                .apply(queryClients);
        if (optionalClient.isPresent()) {
            Client client = optionalClient.get();
            DaoFunction.deleteDetachedFunction().apply(client);
            return client;
        } else {
            String message = "Client '" + selectedClient.toString() + "' not found in the database";
            logger.error(message);
            throw new AssetManagerRuntimeException(message);
        }
    }

    /**
     * @return returns all the clients from the current user logged in the database
     */
    public static List<Client> getClients() {
        User user = UserUtil.getExecutionUser();
        return getClientsFromUser(user);
    }

    /**
     * @param user
     * @return returns the list of clients from the user
     */
    public static List<Client> getClientsFromUser(User user) {
        String query = "select userClientAssociation.client from  UserClientAssociation userClientAssociation "
                + "where userClientAssociation.user = :user";
        List<Client> clients = DaoFunction.<Client>querySimpleListFunction("user", user).apply(query);
        return clients;
    }

    /**
     * @param name of the client
     * 
     * @return the client that has the name of the parameter
     */
    public static Optional<Client> getClientByName(String name) {
        String query = "select client from Client client where client.name=:name";
        Optional<Client> optionalClient = DaoFunction.<Client>querySimpleUniqueFunction("name", name).apply(query);
        return optionalClient;
    }

    /**
     * Adds a client into the database given a client name
     * 
     * @param clientName the name of the client to be inserted in the database
     */
    public static Client addClientByClientName(final User user, String clientName) {
        DaoFunction<String, Client> addClientFuncion = new DaoFunction<String, Client>() {
            @Override
            protected Client doInTransaction(EntityManager entityManager, String clientName) {
                Client client = new Client();
                client.setName(clientName);
                entityManager.persist(client);
                UserClientAssociation userClientAssociation = new UserClientAssociation();
                userClientAssociation.setUser(user);
                userClientAssociation.setClient(client);
                entityManager.persist(userClientAssociation);
                return client;
            }
        };
        return addClientFuncion.apply(clientName);
    }

    /**
     * @return the list of all the clients available in the system
     */
    public static List<Client> getAllClients() {
        String query = "select client from Client client";
        List<Client> clients = DaoFunction.<Client>querySimpleListFunction().apply(query);
        return clients;
    }

    /**
     * @param user
     * @return the list of clients not related with the 'user' passed as parameter
     */
    public static List<Client> getClientsNotLinkedWithUser(User user) {
        String query = "select client from Client client "
                + "where client not in ( select userClientAssociation.client from UserClientAssociation userClientAssociation "
                + "where userClientAssociation.user = :user)";
        List<Client> clients = DaoFunction.<Client>querySimpleListFunction("user", user).apply(query);
        return clients;
    }

}