Initial commit

.gitignore

+#Eclipse
+.settings
+.project
+.classpath
+
+#Maven
+target
+
+#General
+bak
+

README.md

+# Kata 3: JDBC
+
+En esta Kata utilizaremos JDBC para trabajar con una base de datos, partiendo del siguiente proyecto base: https://sing-group.org/dt/gitlab/dai-2324/kata3-base
+
+Este  proyecto contiene un sistema funcional para la gestión de datos de usuarios. El único problema de este sistema es que el almacenamiento de datos realizado por la clase `EmployeesMapDAO` se realiza en memoria, con lo que el sistema no resulta realmente útil.
+
+El objetivo de esta Kata será sustituir la clase `EmployeesMapDAO` por otra llamada `EmployeesDBDAO` que almacene los datos en una base de datos a través de JDBC.
+
+Aunque al principio del Kata se explicará brevemente la estructura del programa, tan solo será necesario crear y editar la clase `EmployeesDBDAO`. Por lo tanto, no será necesario modificar ninguna otra clase, con la excepción de la clase `Launcher` (ver indicaciones en la misma clase) una vez completada la clase `EmployeesDBDAO`.
+
+## Notas
+
+1. La aplicación se puede ejecutar lanzando la clase `es.uvigo.esei.dai.kata3.Launch` o, simplemente, ejecutando el comando `mvn exec:java` desde la raíz del proyecto.
+
+2. Cuando se haya completado la Kata se probará contra dos bases de datos:
+
+   * **JavaDB** / **Derby**: es un SGBD ligero y embebible, diseñado, principalmente, para pruebas. En el proyecto tendrás una base de datos Derby en el directorio `db` y las consultas de creación de las tablas en `sql/employees.javadb.sql`. En principio, no debería ser necesario que las ejecutes manualmente, puesto que la tabla ya debería estar creada en la base de datos.
+
+   * **MySQL**: en el fichero `sql/employees.mysql.sql` están las consultas necesarias para crear las base de datos. La base de datos se llamará `employees` y debe tener acceso a ella el usuario `kata3` con password `kata3`.
+
+

db/employees/README_DO_NOT_TOUCH_FILES.txt

+
+# *************************************************************************
+# ***              DO NOT TOUCH FILES IN THIS DIRECTORY!                ***
+# *** FILES IN THIS DIRECTORY AND SUBDIRECTORIES CONSTITUTE A DERBY     ***
+# *** DATABASE, WHICH INCLUDES THE DATA (USER AND SYSTEM) AND THE       ***
+# *** FILES NECESSARY FOR DATABASE RECOVERY.                            ***
+# *** EDITING, ADDING, OR DELETING ANY OF THESE FILES MAY CAUSE DATA    ***
+# *** CORRUPTION AND LEAVE THE DATABASE IN A NON-RECOVERABLE STATE.     ***
+# *************************************************************************
\ No newline at end of file

db/employees/log/README_DO_NOT_TOUCH_FILES.txt

+
+# *************************************************************************
+# ***              DO NOT TOUCH FILES IN THIS DIRECTORY!                ***
+# *** FILES IN THIS DIRECTORY ARE USED BY THE DERBY DATABASE RECOVERY   ***
+# *** SYSTEM. EDITING, ADDING, OR DELETING FILES IN THIS DIRECTORY      ***
+# *** WILL CAUSE THE DERBY RECOVERY SYSTEM TO FAIL, LEADING TO          ***
+# *** NON-RECOVERABLE CORRUPT DATABASES.                                ***
+# *************************************************************************
\ No newline at end of file

db/employees/seg0/README_DO_NOT_TOUCH_FILES.txt

+
+# *************************************************************************
+# ***              DO NOT TOUCH FILES IN THIS DIRECTORY!                ***
+# *** FILES IN THIS DIRECTORY ARE USED BY THE DERBY DATABASE TO STORE   *** 
+# *** USER AND SYSTEM DATA. EDITING, ADDING, OR DELETING FILES IN THIS  ***
+# *** DIRECTORY WILL CORRUPT THE ASSOCIATED DERBY DATABASE AND MAKE     ***
+# *** IT NON-RECOVERABLE.                                               ***
+# *************************************************************************
\ No newline at end of file

db/employees/service.properties

+#/home/michi/git/dai-katas/Kata3/db/employees
+# ********************************************************************
+# ***                Please do NOT edit this file.                 ***
+# *** CHANGING THE CONTENT OF THIS FILE MAY CAUSE DATA CORRUPTION. ***
+# ********************************************************************
+#Tue Oct 03 13:15:58 CEST 2023
+SysconglomeratesIdentifier=32
+SyscolumnsIdentifier=144
+derby.serviceLocale=en_US
+SystablesIdentifier=96
+SysconglomeratesIndex3Identifier=81
+derby.storage.propertiesId=16
+derby.serviceProtocol=org.apache.derby.database.Database
+SyscolumnsIndex1Identifier=161
+SysschemasIndex2Identifier=225
+SystablesIndex2Identifier=129
+SyscolumnsIndex2Identifier=177
+SysconglomeratesIndex2Identifier=65
+SysschemasIndex1Identifier=209
+SysschemasIdentifier=192
+SystablesIndex1Identifier=113
+SysconglomeratesIndex1Identifier=49
+#--- last line, don't put anything after this line ---

pom.xml

+<?xml version="1.0" encoding="UTF-8"?>
+
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+
+	<groupId>es.uvigo.esei.dai</groupId>
+	<artifactId>kata3</artifactId>
+	<version>1.0.0-SNAPSHOT</version>
+
+	<name>DAI Dojo - Código base Kata 3</name>
+	<inceptionYear>2014</inceptionYear>
+	<url>https://sing-group.org/dt/gitlab/dai-2324/kata3-base</url>
+
+	<developers>
+		<developer>
+			<name>Miguel Reboiro-Jato</name>
+			<organization>Escola Superior de Enxeñaría Informática -
+				Universidade de Vigo</organization>
+			<organizationUrl>https://esei.uvigo.es/</organizationUrl>
+			<email>mrjato@uvigo.gal</email>
+		</developer>
+	</developers>
+
+	<licenses>
+		<license>
+			<name>GNU GENERAL PUBLIC LICENSE, Version 3</name>
+			<url>http://www.gnu.org/licenses/gpl.html</url>
+			<distribution>repo</distribution>
+		</license>
+	</licenses>
+
+	<properties>
+		<maven.compiler.source>11</maven.compiler.source>
+		<maven.compiler.target>11</maven.compiler.target>
+		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
+
+		<!-- Dependencies versions -->
+		<mysql-connector-j.version>8.1.0</mysql-connector-j.version>
+		<derby.version>10.15.2.0</derby.version>
+
+		<!-- Plugin versions -->
+		<license-maven-plugin.version>2.2.0</license-maven-plugin.version>
+		<maven-compiler-plugin.version>3.11.0</maven-compiler-plugin.version>
+		<exec-maven-plugin.version>3.1.0</exec-maven-plugin.version>
+
+		<!-- license-maven-plugin configuration -->
+		<license.licenseName>gpl_v3</license.licenseName>
+		<license.copyrightOwners>Miguel Reboiro Jato</license.copyrightOwners>
+		<license.organizationName>Universidade de Vigo</license.organizationName>
+		<license.addJavaLicenseAfterPackage>false</license.addJavaLicenseAfterPackage>
+	</properties>
+
+	<contributors>
+		<contributor>
+			<name>Miguel Reboiro Jato</name>
+			<email>mrjato@uvigo.gal</email>
+			<organization>Escola Superior de Enxeñaría Informática -
+				Universidade de Vigo</organization>
+			<organizationUrl>https://esei.uvigo.es/</organizationUrl>
+			<roles>
+				<role>author</role>
+				<role>professor</role>
+			</roles>
+		</contributor>
+	</contributors>
+
+	<dependencies>
+		<dependency>
+			<groupId>com.mysql</groupId>
+			<artifactId>mysql-connector-j</artifactId>
+			<version>${mysql-connector-j.version}</version>
+		</dependency>
+		<dependency>
+			<groupId>org.apache.derby</groupId>
+			<artifactId>derby</artifactId>
+			<version>${derby.version}</version>
+		</dependency>
+	</dependencies>
+
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-compiler-plugin</artifactId>
+				<version>${maven-compiler-plugin.version}</version>
+			</plugin>
+			<plugin>
+				<groupId>org.codehaus.mojo</groupId>
+				<artifactId>license-maven-plugin</artifactId>
+				<version>${license-maven-plugin.version}</version>
+				<executions>
+					<execution>
+						<id>first</id>
+						<goals>
+							<goal>update-file-header</goal>
+						</goals>
+						<phase>process-sources</phase>
+					</execution>
+				</executions>
+			</plugin>
+			<plugin>
+				<groupId>org.codehaus.mojo</groupId>
+				<artifactId>exec-maven-plugin</artifactId>
+				<version>${exec-maven-plugin.version}</version>
+				<configuration>
+					<mainClass>es.uvigo.esei.dai.kata3.Launch</mainClass>
+				</configuration>
+			</plugin>
+		</plugins>
+	</build>
+</project>

sql/employees.javadb.sql

+DROP TABLE Employees;
+
+CREATE TABLE Employees (
+	id INTEGER NOT NULL GENERATED ALWAYS AS IDENTITY (START WITH 1, INCREMENT BY 1),
+	name VARCHAR(100) NOT NULL,
+	surname VARCHAR(100) NOT NULL,
+	birth DATE NOT NULL,
+	salary INTEGER NOT NULL,
+	intern BOOLEAN NOT NULL,
+  PRIMARY KEY (id)
+);

sql/employees.mysql.sql

+CREATE DATABASE IF NOT EXISTS `employees`;
+USE `employees`;
+
+DROP TABLE IF EXISTS Employees;
+
+CREATE TABLE `employees`.`Employees` (
+  `id` INT NOT NULL AUTO_INCREMENT ,
+  `name` VARCHAR(100) NULL ,
+  `surname` VARCHAR(100) NULL ,
+  `birth` DATE NULL ,
+  `salary` INT NULL ,
+  `intern` BIT NULL ,
+  PRIMARY KEY (`id`)
+);

src/main/java/es/uvigo/esei/dai/kata3/EmployeeNotFoundException.java

+/*-
+ * #%L
+ * DAI Dojo - Código base Kata 3
+ * %%
+ * Copyright (C) 2014 - 2023 Miguel Reboiro Jato
+ * %%
+ * This program 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.
+ * 
+ * This program 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 this program.  If not, see
+ * <http://www.gnu.org/licenses/gpl-3.0.html>.
+ * #L%
+ */
+package es.uvigo.esei.dai.kata3;
+
+public class EmployeeNotFoundException extends Exception {
+  private static final long serialVersionUID = 1L;
+  private final int id;
+
+  public EmployeeNotFoundException(int id) {
+    this.id = id;
+  }
+
+  public EmployeeNotFoundException(String message, int id) {
+    super(message);
+    this.id = id;
+  }
+
+  public EmployeeNotFoundException(Throwable cause, int id) {
+    super(cause);
+    this.id = id;
+  }
+
+  public EmployeeNotFoundException(String message, Throwable cause, int id) {
+    super(message, cause);
+    this.id = id;
+  }
+
+  public EmployeeNotFoundException(
+    String message, Throwable cause, boolean enableSuppression, boolean writableStackTrace, int id
+  ) {
+    super(message, cause, enableSuppression, writableStackTrace);
+    this.id = id;
+  }
+
+  public int getId() {
+    return this.id;
+  }
+}

src/main/java/es/uvigo/esei/dai/kata3/Launch.java

+/*-
+ * #%L
+ * DAI Dojo - Código base Kata 3
+ * %%
+ * Copyright (C) 2014 - 2023 Miguel Reboiro Jato
+ * %%
+ * This program 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.
+ * 
+ * This program 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 this program.  If not, see
+ * <http://www.gnu.org/licenses/gpl-3.0.html>.
+ * #L%
+ */
+package es.uvigo.esei.dai.kata3;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+
+import javax.swing.JFrame;
+import javax.swing.SwingUtilities;
+import javax.swing.UIManager;
+import javax.swing.UIManager.LookAndFeelInfo;
+
+import es.uvigo.esei.dai.kata3.controller.DefaultEmployeesController;
+import es.uvigo.esei.dai.kata3.controller.EmployeesController;
+import es.uvigo.esei.dai.kata3.model.dao.EmployeesDAO;
+import es.uvigo.esei.dai.kata3.model.dao.EmployeesMapDAO;
+import es.uvigo.esei.dai.kata3.view.EmployeesPanel;
+
+public class Launch {
+  public static void main(String[] args) throws SQLException {
+    // Una vez completado el ejercicio cambiar el DAO creado
+    final EmployeesDAO dao = new EmployeesMapDAO();
+    // final EmployeesDAO dao = createEmployeesJavaDBDAO(false);
+    // final EmployeesDAO dao = createEmployeesMySQLDBDAO();
+
+    final EmployeesController controller = new DefaultEmployeesController(dao);
+
+    SwingUtilities.invokeLater(() -> {
+      changeLookAndFeelToNimbus();
+
+      final JFrame frame = new JFrame("Employees Manager");
+      frame.setContentPane(new EmployeesPanel(controller));
+
+      frame.setSize(800, 600);
+      frame.setLocationRelativeTo(null);
+      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+      frame.setVisible(true);
+    });
+  }
+
+  /* Una vez completado el ejercicio descomentar este bloque de código.
+  private final static EmployeesDAO createEmployeesJavaDBDAO(boolean createDatabase) throws SQLException {
+    final Connection connection;
+
+    // La base de datos ya debería estar creada
+    if (createDatabase) {
+      connection = DriverManager.getConnection("jdbc:derby:db/employees;create=true", "kata3", "kata3");
+      createJavaDBDatabase(connection);
+    } else {
+      connection = DriverManager.getConnection("jdbc:derby:db/employees", "kata3", "kata3");
+    }
+
+    return new EmployeesDBDAO(connection);
+  }
+
+  private final static void createJavaDBDatabase(Connection connection) throws SQLException {
+    connection.createStatement().execute("CREATE SCHEMA KATA3");
+    connection.createStatement().execute(
+      "CREATE TABLE Employees "
+        + "(id INTEGER NOT NULL GENERATED ALWAYS AS IDENTITY (START WITH 1, INCREMENT BY 1), "
+        + "name VARCHAR(100) NOT NULL, "
+        + "surname VARCHAR(100) NOT NULL, "
+        + "birth DATE NOT NULL, "
+        + "salary INTEGER NOT NULL, "
+        + "intern BOOLEAN NOT NULL,  PRIMARY KEY (id)"
+        + ")"
+    );
+  }
+
+  private final static EmployeesDAO createEmployeesMySQLDBDAO() throws SQLException {
+    final Connection connection = DriverManager
+      .getConnection("jdbc:mysql://localhost:3306/employees", "kata3", "kata3");
+
+    return new EmployeesDBDAO(connection);
+  }*/
+
+  private static void changeLookAndFeelToNimbus() {
+    try {
+      for (LookAndFeelInfo info : UIManager.getInstalledLookAndFeels()) {
+        if ("Nimbus".equals(info.getName())) {
+          UIManager.setLookAndFeel(info.getClassName());
+          break;
+        }
+      }
+    } catch (Exception e) {
+      // If Nimbus is not available, you can set the GUI to another
+      // look and feel.
+    }
+  }
+}

src/main/java/es/uvigo/esei/dai/kata3/SearchType.java

+/*-
+ * #%L
+ * DAI Dojo - Código base Kata 3
+ * %%
+ * Copyright (C) 2014 - 2023 Miguel Reboiro Jato
+ * %%
+ * This program 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.
+ * 
+ * This program 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 this program.  If not, see
+ * <http://www.gnu.org/licenses/gpl-3.0.html>.
+ * #L%
+ */
+package es.uvigo.esei.dai.kata3;
+
+public enum SearchType {
+  NAME("Name"),
+  SURNAME("Surname"),
+  SALARY("Salary");
+
+  private final String label;
+
+  private SearchType(String label) {
+    this.label = label;
+  }
+
+  @Override
+  public String toString() {
+    return this.label;
+  }
+}

src/main/java/es/uvigo/esei/dai/kata3/controller/DefaultEmployeesController.java

+/*-
+ * #%L
+ * DAI Dojo - Código base Kata 3
+ * %%
+ * Copyright (C) 2014 - 2023 Miguel Reboiro Jato
+ * %%
+ * This program 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.
+ * 
+ * This program 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 this program.  If not, see
+ * <http://www.gnu.org/licenses/gpl-3.0.html>.
+ * #L%
+ */
+package es.uvigo.esei.dai.kata3.controller;
+
+import java.util.List;
+
+import es.uvigo.esei.dai.kata3.EmployeeNotFoundException;
+import es.uvigo.esei.dai.kata3.SearchType;
+import es.uvigo.esei.dai.kata3.model.dao.EmployeesDAO;
+import es.uvigo.esei.dai.kata3.model.entity.Employee;
+
+public class DefaultEmployeesController implements EmployeesController {
+  private final EmployeesDAO dao;
+
+  public DefaultEmployeesController(EmployeesDAO dao) {
+    this.dao = dao;
+  }
+
+  @Override
+  public Employee get(int id) throws EmployeeNotFoundException {
+    return this.dao.get(id);
+  }
+
+  @Override
+  public void create(Employee employee) {
+    this.dao.create(employee);
+  }
+
+  @Override
+  public void update(Employee employee) throws EmployeeNotFoundException {
+    this.dao.update(employee);
+  }
+
+  @Override
+  public void delete(int id) throws EmployeeNotFoundException {
+    this.dao.delete(id);
+  }
+
+  @Override
+  public List<Employee> list() {
+    return this.dao.list();
+  }
+
+  @Override
+  public List<Employee> list(SearchType type, String value) throws IllegalArgumentException {
+    switch (type) {
+    case NAME:
+      return this.dao.listByName(value);
+    case SURNAME:
+      return this.dao.listBySurname(value);
+    case SALARY:
+      try {
+        return this.dao.listBySalary(Integer.parseInt(value));
+      } catch (NumberFormatException nfe) {
+        throw new IllegalArgumentException(nfe);
+      }
+    default:
+      throw new IllegalArgumentException("Unknown type: " + type);
+    }
+  }
+}

src/main/java/es/uvigo/esei/dai/kata3/controller/EmployeesController.java

+/*-
+ * #%L
+ * DAI Dojo - Código base Kata 3
+ * %%
+ * Copyright (C) 2014 - 2023 Miguel Reboiro Jato
+ * %%
+ * This program 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.
+ * 
+ * This program 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 this program.  If not, see
+ * <http://www.gnu.org/licenses/gpl-3.0.html>.
+ * #L%
+ */
+package es.uvigo.esei.dai.kata3.controller;
+
+import java.util.List;
+
+import es.uvigo.esei.dai.kata3.EmployeeNotFoundException;
+import es.uvigo.esei.dai.kata3.SearchType;
+import es.uvigo.esei.dai.kata3.model.entity.Employee;
+
+public interface EmployeesController {
+  public void create(Employee employee);
+
+  public void update(Employee employee) throws EmployeeNotFoundException;
+
+  public void delete(int id) throws EmployeeNotFoundException;
+
+  public Employee get(int id) throws EmployeeNotFoundException;
+
+  public List<Employee> list();
+
+  public List<Employee> list(SearchType type, String value) throws IllegalArgumentException;
+}

src/main/java/es/uvigo/esei/dai/kata3/model/dao/EmployeesDAO.java

+/*-
+ * #%L
+ * DAI Dojo - Código base Kata 3
+ * %%
+ * Copyright (C) 2014 - 2023 Miguel Reboiro Jato
+ * %%
+ * This program 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.
+ * 
+ * This program 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 this program.  If not, see
+ * <http://www.gnu.org/licenses/gpl-3.0.html>.
+ * #L%
+ */
+package es.uvigo.esei.dai.kata3.model.dao;
+
+import java.util.List;
+
+import es.uvigo.esei.dai.kata3.EmployeeNotFoundException;
+import es.uvigo.esei.dai.kata3.model.entity.Employee;
+
+public interface EmployeesDAO {
+  public void create(Employee employee); // Debe asignársele a employee el id generado
+
+  public void update(Employee employee) throws EmployeeNotFoundException;
+
+  public void delete(int id) throws EmployeeNotFoundException;
+
+  public Employee get(int id) throws EmployeeNotFoundException;
+
+  public List<Employee> list();
+
+  public List<Employee> listByName(String name);
+
+  public List<Employee> listBySurname(String surname);
+
+  public List<Employee> listBySalary(int minimumSalary);
+}

src/main/java/es/uvigo/esei/dai/kata3/model/dao/EmployeesMapDAO.java

+/*-
+ * #%L
+ * DAI Dojo - Código base Kata 3
+ * %%
+ * Copyright (C) 2014 - 2023 Miguel Reboiro Jato
+ * %%
+ * This program 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.
+ * 
+ * This program 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 this program.  If not, see
+ * <http://www.gnu.org/licenses/gpl-3.0.html>.
+ * #L%
+ */
+package es.uvigo.esei.dai.kata3.model.dao;
+
+import java.util.ArrayList;
+import java.util.Calendar;
+import java.util.GregorianCalendar;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+
+import es.uvigo.esei.dai.kata3.EmployeeNotFoundException;
+import es.uvigo.esei.dai.kata3.model.entity.Employee;
+
+public class EmployeesMapDAO implements EmployeesDAO {
+  private final Map<Integer, Employee> employees;
+
+  private int idGenerator;
+
+  public EmployeesMapDAO() {
+    this.employees = new HashMap<>();
+
+    final Calendar calendar = GregorianCalendar.getInstance();
+
+    this.idGenerator = 1;
+    calendar.set(1980, Calendar.FEBRUARY, 10);
+    this.create(new Employee("Manuel", "Martínez", calendar.getTime(), 10000, false));
+    calendar.set(1975, Calendar.MARCH, 21);
+    this.create(new Employee("María", "Muñíz", calendar.getTime(), 12000, true));
+
+  }
+
+  @Override
+  public Employee get(int id) throws EmployeeNotFoundException {
+    if (this.employees.containsKey(id)) {
+      return this.employees.get(id);
+    } else {
+      throw new EmployeeNotFoundException(id);
+    }
+  }
+
+  @Override
+  public void create(Employee employee) {
+    employee.setId(this.idGenerator++);
+    this.employees.put(employee.getId(), employee);
+  }
+
+  @Override
+  public void update(Employee employee) throws EmployeeNotFoundException {
+    System.out.println(employee);
+    System.out.println(this.employees);
+    if (this.employees.containsKey(employee.getId())) {
+      this.employees.put(employee.getId(), employee);
+      System.out.println(this.employees);
+    } else {
+      throw new EmployeeNotFoundException(employee.getId());
+    }
+  }
+
+  @Override
+  public void delete(int id) throws EmployeeNotFoundException {
+    if (this.employees.remove(id) == null) {
+      throw new EmployeeNotFoundException(id);
+    }
+  }
+
+  @Override
+  public List<Employee> list() {
+    return new ArrayList<>(this.employees.values());
+  }
+
+  @Override
+  public List<Employee> listByName(String name) {
+    final List<Employee> employees = this.list();
+
+    final Iterator<Employee> itEmployees = employees.iterator();
+    while (itEmployees.hasNext()) {
+      if (!itEmployees.next().getName().contains(name)) {
+        itEmployees.remove();
+      }
+    }
+
+    return employees;
+  }
+
+  @Override
+  public List<Employee> listBySurname(String surname) {
+    final List<Employee> employees = this.list();
+
+    final Iterator<Employee> itEmployees = employees.iterator();
+    while (itEmployees.hasNext()) {
+      if (!itEmployees.next().getSurname().contains(surname)) {
+        itEmployees.remove();
+      }
+    }
+
+    return employees;
+  }
+
+  @Override
+  public List<Employee> listBySalary(int minimumSalary) {
+    final List<Employee> employees = this.list();
+
+    final Iterator<Employee> itEmployees = employees.iterator();
+    while (itEmployees.hasNext()) {
+      if (itEmployees.next().getSalary() < minimumSalary) {
+        itEmployees.remove();
+      }
+    }
+
+    return employees;
+  }
+}

src/main/java/es/uvigo/esei/dai/kata3/model/entity/Employee.java

+/*-
+ * #%L
+ * DAI Dojo - Código base Kata 3
+ * %%
+ * Copyright (C) 2014 - 2023 Miguel Reboiro Jato
+ * %%
+ * This program 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.
+ * 
+ * This program 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 this program.  If not, see
+ * <http://www.gnu.org/licenses/gpl-3.0.html>.
+ * #L%
+ */
+package es.uvigo.esei.dai.kata3.model.entity;
+
+import java.io.Serializable;
+import java.util.Date;
+import java.util.Objects;
+
+public class Employee implements Serializable {
+  private static final long serialVersionUID = 1L;
+
+  private Integer id;
+  private String name;
+  private String surname;
+  private int salary;
+  private Date birth;
+  private boolean intern;
+
+  public Employee() {
+  }
+
+  public Employee(String name, String surname, Date birth, int salary, boolean intern) {
+    this.name = name;
+    this.surname = surname;
+    this.salary = salary;
+    this.birth = birth;
+    this.intern = intern;
+  }
+
+  public Employee(Integer id, String name, String surname, Date birth, int salary, boolean intern) {
+    this.id = id;
+    this.name = name;
+    this.surname = surname;
+    this.birth = birth;
+    this.salary = salary;
+    this.intern = intern;
+  }
+
+  public Integer getId() {
+    return id;
+  }
+
+  public void setId(Integer id) {
+    this.id = id;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public void setName(String name) {
+    this.name = name;
+  }
+
+  public String getSurname() {
+    return surname;
+  }
+
+  public void setSurname(String surname) {
+    this.surname = surname;
+  }
+
+  public int getSalary() {
+    return salary;
+  }
+
+  public void setSalary(int salary) {
+    this.salary = salary;
+  }
+
+  public Date getBirth() {
+    return birth;
+  }
+
+  public void setBirth(Date birth) {
+    this.birth = birth;
+  }
+
+  public boolean isIntern() {
+    return intern;
+  }
+
+  public void setIntern(boolean intern) {
+    this.intern = intern;
+  }
+  
+  @Override
+  public int hashCode() {
+    return Objects.hash(birth, id, intern, name, salary, surname);
+  }
+
+  @Override
+  public boolean equals(Object obj) {
+    if (this == obj)
+      return true;
+    if (obj == null)
+      return false;
+    if (getClass() != obj.getClass())
+      return false;
+    Employee other = (Employee) obj;
+    return Objects.equals(birth, other.birth) && Objects.equals(id, other.id) && intern == other.intern
+      && Objects.equals(name, other.name) && salary == other.salary && Objects.equals(surname, other.surname);
+  }
+
+  @Override
+  public String toString() {
+    return "Employee [id=" + id + ", name=" + name + ", surname=" + surname + ", salary=" + salary + ", birth=" + birth
+      + ", intern=" + intern + "]";
+  }
+
+}

src/main/java/es/uvigo/esei/dai/kata3/view/EmployeesDataPanel.java

+/*-
+ * #%L
+ * DAI Dojo - Código base Kata 3
+ * %%
+ * Copyright (C) 2014 - 2023 Miguel Reboiro Jato
+ * %%
+ * This program 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.
+ * 
+ * This program 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 this program.  If not, see
+ * <http://www.gnu.org/licenses/gpl-3.0.html>.
+ * #L%
+ */
+package es.uvigo.esei.dai.kata3.view;
+
+import java.awt.BorderLayout;
+import java.awt.Dimension;
+import java.awt.FlowLayout;
+import java.awt.Font;
+import java.awt.event.ActionEvent;
+import java.awt.event.FocusAdapter;
+import java.awt.event.FocusEvent;
+import java.text.NumberFormat;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+
+import javax.swing.AbstractAction;
+import javax.swing.JButton;
+import javax.swing.JCheckBox;
+import javax.swing.JComponent;
+import javax.swing.JFormattedTextField;
+import javax.swing.JLabel;
+import javax.swing.JOptionPane;
+import javax.swing.JPanel;
+import javax.swing.JTextField;
+import javax.swing.SpringLayout;
+
+import es.uvigo.esei.dai.kata3.EmployeeNotFoundException;
+import es.uvigo.esei.dai.kata3.model.entity.Employee;
+
+public class EmployeesDataPanel extends JPanel {
+  private static final long serialVersionUID = 1L;
+
+  private final EmployeesMediator mediator;
+
+  private final JTextField txtName;
+  private final JTextField txtSurname;
+  private final JFormattedTextField ftxtSalary;
+  private final JFormattedTextField ftxtBirth;
+  private final JCheckBox chkIntern;
+
+  private final JButton btnSaveOrUpdate;
+  private final JButton btnDelete;
+  private final JButton btnReset;
+
+  private Employee employee;
+
+  public EmployeesDataPanel(EmployeesMediator mediator) {
+    super(new FlowLayout(FlowLayout.LEADING));
+
+    this.mediator = mediator;
+
+    // Header
+    final JLabel lblHeader = new JLabel("Employee Data");
+    lblHeader.setFont(lblHeader.getFont().deriveFont(Font.BOLD));
+    lblHeader.setHorizontalTextPosition(JLabel.CENTER);
+    // End Header
+
+    // Form
+    this.txtName = new JTextField();
+    this.txtName.setPreferredSize(new Dimension(200, (int) this.txtName.getPreferredSize().getHeight()));
+    this.txtSurname = new JTextField();
+    this.ftxtSalary = new JFormattedTextField(NumberFormat.getIntegerInstance());
+    this.ftxtBirth = new JFormattedTextField(new SimpleDateFormat("dd/MM/yyyy"));
+    this.chkIntern = new JCheckBox();
+
+    final String[] labels = new String[] { "Name", "Surname", "Salary", "Birth", "Is intern?" };
+    final JComponent[] components = new JComponent[] { this.txtName, this.txtSurname, this.ftxtSalary, this.ftxtBirth,
+      this.chkIntern };
+
+    final JPanel panelData = new JPanel(new SpringLayout());
+    final ValidateFocusAdapter validator = new ValidateFocusAdapter();
+    for (int i = 0; i < labels.length; i++) {
+      final JLabel label = new JLabel(labels[i]);
+      label.setLabelFor(components[i]);
+
+      panelData.add(label);
+      panelData.add(components[i]);
+
+      components[i].addFocusListener(validator);
+    }
+    SpringUtilities.makeCompactGrid(panelData, 5, 2, 6, 6, 6, 6);
+    // End Form
+
+    // Buttons
+    final JPanel panelButtons = new JPanel();
+    this.btnSaveOrUpdate = new JButton(new ActionSaveOrUpdate());
+    this.btnReset = new JButton(new ActionReset());
+    this.btnDelete = new JButton(new ActionDelete());
+
+    panelButtons.add(this.btnSaveOrUpdate);
+    panelButtons.add(this.btnReset);
+    panelButtons.add(this.btnDelete);
+    // End Buttons
+
+    final JPanel containerPanel = new JPanel(new BorderLayout());
+    containerPanel.add(lblHeader, BorderLayout.NORTH);
+    containerPanel.add(panelData, BorderLayout.CENTER);
+    containerPanel.add(panelButtons, BorderLayout.SOUTH);
+
+    this.add(containerPanel);
+
+    this.newEmployee();
+  }
+
+  protected void validateFields() {
+    this.btnSaveOrUpdate.setEnabled(
+      !(this.txtName.getText().trim().isEmpty() || this.txtSurname.getText().trim().isEmpty()
+        || this.ftxtSalary.getText().trim().isEmpty() || this.ftxtBirth.getText().trim().isEmpty())
+    );
+  }
+
+  public Employee getEmployee() {
+    this.employee.setName(this.txtName.getText());
+    this.employee.setSurname(this.txtSurname.getText());
+    this.employee.setSalary(((Number) this.ftxtSalary.getValue()).intValue());
+    this.employee.setBirth((Date) this.ftxtBirth.getValue());
+    this.employee.setIntern(this.chkIntern.isSelected());
+
+    return this.employee;
+  }
+
+  public void setEmployee(Employee employee) {
+    this.employee = employee;
+
+    this.txtName.setText(this.employee.getName());
+    this.txtSurname.setText(this.employee.getSurname());
+    this.ftxtSalary.setValue(this.employee.getSalary());
+    this.ftxtBirth.setValue(this.employee.getBirth());
+    this.chkIntern.setSelected(this.employee.isIntern());
+
+    if (this.isNewEmployee()) {
+      this.btnSaveOrUpdate.setText("Save");
+      this.btnDelete.setEnabled(false);
+    } else {
+      this.btnSaveOrUpdate.setText("Update");
+      this.btnDelete.setEnabled(true);
+    }
+    this.validateFields();
+  }
+
+  public void newEmployee() {
+    this.setEmployee(new Employee());
+  }
+
+  private boolean isNewEmployee() {
+    return this.employee.getId() == null;
+  }
+
+  private final class ValidateFocusAdapter extends FocusAdapter {
+    @Override
+    public void focusLost(FocusEvent e) {
+      EmployeesDataPanel.this.validateFields();
+    }
+  }
+
+  private final class ActionDelete extends AbstractAction {
+    private static final long serialVersionUID = 1L;
+
+    private ActionDelete() {
+      super("Delete");
+    }
+
+    @Override
+    public void actionPerformed(ActionEvent e) {
+      try {
+        EmployeesDataPanel.this.mediator.deleteEmployee(EmployeesDataPanel.this.employee);
+      } catch (EmployeeNotFoundException e1) {
+        JOptionPane.showMessageDialog(
+          EmployeesDataPanel.this, "Error al eliminar el empleado. Identificador desconocido", "Error",
+          JOptionPane.ERROR_MESSAGE
+        );
+      }
+    }
+  }
+
+  private final class ActionReset extends AbstractAction {
+    private static final long serialVersionUID = 1L;
+
+    private ActionReset() {
+      super("Reset");
+    }
+
+    @Override
+    public void actionPerformed(ActionEvent e) {
+      EmployeesDataPanel.this.setEmployee(EmployeesDataPanel.this.employee);
+    }
+  }
+
+  private final class ActionSaveOrUpdate extends AbstractAction {
+    private static final long serialVersionUID = 1L;
+
+    private ActionSaveOrUpdate() {
+      super("Save");
+    }
+
+    @Override
+    public void actionPerformed(ActionEvent e) {
+      if (EmployeesDataPanel.this.isNewEmployee()) {
+        EmployeesDataPanel.this.mediator.createEmployee(EmployeesDataPanel.this.getEmployee());
+      } else {
+        try {
+          EmployeesDataPanel.this.mediator.updateEmployee(EmployeesDataPanel.this.getEmployee());
+        } catch (EmployeeNotFoundException e1) {
+          JOptionPane.showMessageDialog(
+            EmployeesDataPanel.this, "Error al actualizar los datos del empleado. Identificador desconocido", "Error",
+            JOptionPane.ERROR_MESSAGE
+          );
+        }
+      }
+    }
+  }
+}

src/main/java/es/uvigo/esei/dai/kata3/view/EmployeesMediator.java

+/*-
+ * #%L
+ * DAI Dojo - Código base Kata 3
+ * %%
+ * Copyright (C) 2014 - 2023 Miguel Reboiro Jato
+ * %%
+ * This program 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.
+ * 
+ * This program 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 this program.  If not, see
+ * <http://www.gnu.org/licenses/gpl-3.0.html>.
+ * #L%
+ */
+package es.uvigo.esei.dai.kata3.view;
+
+import java.util.List;
+
+import javax.swing.JTable;
+import javax.swing.JTextField;
+
+import es.uvigo.esei.dai.kata3.EmployeeNotFoundException;
+import es.uvigo.esei.dai.kata3.SearchType;
+import es.uvigo.esei.dai.kata3.controller.EmployeesController;
+import es.uvigo.esei.dai.kata3.model.entity.Employee;
+import es.uvigo.esei.dai.kata3.view.EmployeesPanel.EmployeeTableModel;
+
+class EmployeesMediator {
+  private final EmployeesController controller;
+
+  private EmployeesDataPanel dataPanel;
+  private JTable table;
+  private JTextField txtSearch;
+
+  public EmployeesMediator(EmployeesController controller) {
+    this.controller = controller;
+  }
+
+  public void setDataPanel(EmployeesDataPanel dataPanel) {
+    this.dataPanel = dataPanel;
+  }
+
+  public void setTable(JTable table) {
+    this.table = table;
+  }
+
+  public void setTxtSearch(JTextField txtSearch) {
+    this.txtSearch = txtSearch;
+  }
+
+  public void newEmployee() {
+    this.dataPanel.newEmployee();
+    this.table.clearSelection();
+  }
+
+  public void createEmployee(Employee employee) {
+    this.controller.create(employee);
+
+    this.clearSearch();
+    this.dataPanel.setEmployee(employee);
+    this.selectEmployee(employee);
+  }
+
+  public void editEmployee(Employee employee) {
+    this.dataPanel.setEmployee(employee);
+  }
+
+  public void updateEmployee(Employee employee) throws EmployeeNotFoundException {
+    this.controller.update(employee);
+
+    this.clearSearch();
+    this.dataPanel.setEmployee(employee);
+    this.selectEmployee(employee);
+  }
+
+  public void deleteEmployee(Employee employee) throws EmployeeNotFoundException {
+    this.controller.delete(employee.getId());
+
+    this.clearSearch();
+    this.table.clearSelection();
+    this.dataPanel.newEmployee();
+  }
+
+  public void clearSearch() {
+    this.search(null, null);
+    this.txtSearch.setText("");
+  }
+
+  public void search(SearchType type, String value) {
+    final List<Employee> employees;
+
+    if (value == null || value.trim().isEmpty()) {
+      employees = this.controller.list();
+    } else {
+      employees = this.controller.list(type, value.trim());
+    }
+
+    this.updateEmployeeList(employees);
+    this.dataPanel.newEmployee();
+  }
+
+  private void updateEmployeeList(final List<Employee> employees) {
+    ((EmployeeTableModel) this.table.getModel()).setEmployees(employees);
+  }
+
+  private void selectEmployee(final Employee employee) {
+    final EmployeeTableModel model = (EmployeeTableModel) this.table.getModel();
+    final int index = model.indexOf(employee);
+
+    if (index >= 0) {
+      this.table.setRowSelectionInterval(index, index);
+    }
+  }
+}

src/main/java/es/uvigo/esei/dai/kata3/view/EmployeesPanel.java

+/*-
+ * #%L
+ * DAI Dojo - Código base Kata 3
+ * %%
+ * Copyright (C) 2014 - 2023 Miguel Reboiro Jato
+ * %%
+ * This program 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.
+ * 
+ * This program 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 this program.  If not, see
+ * <http://www.gnu.org/licenses/gpl-3.0.html>.
+ * #L%
+ */
+package es.uvigo.esei.dai.kata3.view;
+
+import java.awt.BorderLayout;
+import java.awt.FlowLayout;
+import java.awt.event.ActionEvent;
+import java.util.List;
+
+import javax.swing.AbstractAction;
+import javax.swing.BorderFactory;
+import javax.swing.JButton;
+import javax.swing.JComboBox;
+import javax.swing.JOptionPane;
+import javax.swing.JPanel;
+import javax.swing.JScrollPane;
+import javax.swing.JTable;
+import javax.swing.JTextField;
+import javax.swing.ListSelectionModel;
+import javax.swing.event.ListSelectionEvent;
+import javax.swing.event.ListSelectionListener;
+import javax.swing.table.AbstractTableModel;
+
+import es.uvigo.esei.dai.kata3.SearchType;
+import es.uvigo.esei.dai.kata3.controller.EmployeesController;
+import es.uvigo.esei.dai.kata3.model.entity.Employee;
+
+public class EmployeesPanel extends JPanel {
+  private static final long serialVersionUID = 1L;
+
+  private final JButton btnNewEmployee;
+
+  private final JTextField txtSearch;
+  private final JComboBox<SearchType> cmbSearchType;
+  private final JButton btnSearch;
+  private final JButton btnClear;
+
+  private final JTable tableEmployees;
+
+  private final EmployeesDataPanel dataPanel;
+
+  private final EmployeesMediator mediator;
+
+  public EmployeesPanel(EmployeesController controller) {
+    super(new BorderLayout());
+
+    this.mediator = new EmployeesMediator(controller);
+
+    // TOP Panel
+    this.txtSearch = new JTextField();
+    this.cmbSearchType = new JComboBox<>(SearchType.values());
+    this.cmbSearchType.setSelectedIndex(0);
+    this.btnSearch = new JButton(new ActionSearch());
+    this.btnClear = new JButton(new ActionClear());
+    this.btnNewEmployee = new JButton(new ActionNewEmployee());
+    this.mediator.setTxtSearch(this.txtSearch);
+
+    final JPanel panelTop = new JPanel(new BorderLayout(10, 4));
+
+    final JPanel panelSearchButtons = new JPanel(new FlowLayout(FlowLayout.LEADING, 0, 0));
+    panelSearchButtons.add(this.cmbSearchType);
+    panelSearchButtons.add(this.btnSearch);
+    panelSearchButtons.add(this.btnClear);
+
+    final JPanel panelSearch = new JPanel(new BorderLayout());
+    panelSearch.setBorder(BorderFactory.createEmptyBorder(4, 4, 4, 4));
+    panelSearch.add(this.txtSearch, BorderLayout.CENTER);
+    panelSearch.add(panelSearchButtons, BorderLayout.EAST);
+
+    panelTop.add(this.btnNewEmployee, BorderLayout.EAST);
+    panelTop.add(panelSearch, BorderLayout.CENTER);
+    // End TOP Panel
+
+    // Employees Table
+    final EmployeeTableModel model = new EmployeeTableModel(controller.list());
+    this.tableEmployees = new JTable(model);
+    this.tableEmployees.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
+    this.tableEmployees.setRowSelectionAllowed(true);
+    this.tableEmployees.setColumnSelectionAllowed(false);
+    this.tableEmployees.getSelectionModel().addListSelectionListener(new ListSelectionListener() {
+      @Override
+      public void valueChanged(ListSelectionEvent e) {
+        final int index = EmployeesPanel.this.tableEmployees.getSelectedRow();
+
+        if (index >= 0) {
+          EmployeesPanel.this.mediator.editEmployee(model.getEmployee(index));
+        }
+      }
+    });
+
+    this.mediator.setTable(this.tableEmployees);
+    // End Employees Table
+
+    // Employees Data Panel
+    this.dataPanel = new EmployeesDataPanel(this.mediator);
+    this.mediator.setDataPanel(this.dataPanel);
+    // End Employees Data Panel
+
+    this.add(panelTop, BorderLayout.NORTH);
+    this.add(new JScrollPane(this.tableEmployees), BorderLayout.CENTER);
+    this.add(this.dataPanel, BorderLayout.EAST);
+  }
+
+  final class EmployeeTableModel extends AbstractTableModel {
+    private static final long serialVersionUID = 1L;
+
+    private List<Employee> employees;
+
+    public EmployeeTableModel(List<Employee> employees) {
+      this.employees = employees;
+    }
+
+    public void setEmployees(List<Employee> employees) {
+      this.employees = employees;
+      this.fireTableDataChanged();
+    }
+
+    public Employee getEmployee(int index) {
+      return this.employees.get(index);
+    }
+
+    public int indexOf(Employee employee) {
+      if (employee.getId() != null) {
+        for (int i = 0; i < this.employees.size(); i++) {
+          if (this.employees.get(i).getId().equals(employee.getId()))
+            return i;
+        }
+      }
+
+      return -1;
+    }
+
+    @Override
+    public int getColumnCount() {
+      return 3;
+    }
+
+    @Override
+    public int getRowCount() {
+      return this.employees.size();
+    }
+
+    @Override
+    public String getColumnName(int column) {
+      final String[] columns = new String[] { "Name", "Surname", "Salary" };
+      return columns[column];
+    }
+
+    @Override
+    public Object getValueAt(int rowIndex, int columnIndex) {
+      final Employee employee = this.employees.get(rowIndex);
+      switch (columnIndex) {
+      case 0:
+        return employee.getName();
+      case 1:
+        return employee.getSurname();
+      case 2:
+        return employee.getSalary();
+      default:
+        return null;
+      }
+    }
+  }
+
+  private final class ActionSearch extends AbstractAction {
+    private static final long serialVersionUID = 1L;
+
+    private ActionSearch() {
+      super("Search");
+    }
+
+    @Override
+    public void actionPerformed(ActionEvent e) {
+      try {
+        EmployeesPanel.this.mediator.search(
+          (SearchType) EmployeesPanel.this.cmbSearchType.getSelectedItem(), EmployeesPanel.this.txtSearch.getText()
+        );
+      } catch (IllegalArgumentException iae) {
+        JOptionPane
+          .showMessageDialog(EmployeesPanel.this, "Valor de búsqueda incorrecto", "Error", JOptionPane.ERROR_MESSAGE);
+      }
+    }
+  }
+
+  public class ActionClear extends AbstractAction {
+    private static final long serialVersionUID = 1L;
+
+    public ActionClear() {
+      super("Clear");
+    }
+
+    @Override
+    public void actionPerformed(ActionEvent e) {
+      try {
+        EmployeesPanel.this.mediator.clearSearch();
+      } catch (IllegalArgumentException iae) {
+        JOptionPane
+          .showMessageDialog(EmployeesPanel.this, "Valor de búsqueda incorrecto", "Error", JOptionPane.ERROR_MESSAGE);
+      }
+    }
+  }
+
+  private final class ActionNewEmployee extends AbstractAction {
+    private static final long serialVersionUID = 1L;
+
+    private ActionNewEmployee() {
+      super("New Employee");
+    }
+
+    @Override
+    public void actionPerformed(ActionEvent e) {
+      EmployeesPanel.this.mediator.newEmployee();
+    }
+  }
+}