Updated database implementation

*Added a contact abstract class that serves as a superclass for user and
group
* Added a group class
* Updated persistenceManager to fit the new contact system.
* Updated all classes that used methods, that were updated.

src/main/java/envoy/server/data/Contact.java

@@ -0,0 +1,62 @@
+package envoy.server.data;
+
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+import javax.persistence.MappedSuperclass;
+
+/**
+ * This class acts as a superclass for all contacts, being {@link User}s and
+ * {@link Group}s. <br>
+ * <br>
+ * Project: <strong>envoy-server-standalone</strong><br>
+ * File: <strong>Contact.java</strong><br>
+ * Created: <strong>24.03.2020</strong><br>
+ * 
+ * @author Maximilian K&auml;fer
+ * @since Envoy Server Standalone v0.1-alpha
+ */
+
+@MappedSuperclass
+// TODO add queries
+public abstract class Contact {
+
+	@Id
+	@GeneratedValue(strategy = GenerationType.IDENTITY)
+	protected long		id;
+	protected String	name;
+
+	/**
+	 * @return a envoy.data.Contact object of this envoy.server.data.Contact object.
+	 * @since Envoy Server Standalone v0.1-beta
+	 */
+	public abstract envoy.data.Contact toCommon();
+
+	/**
+	 * @return the ID of this contact.
+	 * @since Envoy Server Standalone v0.1-beta
+	 */
+	public long getID() { return id; }
+
+	/**
+	 * Sets the ID of this contact.
+	 * 
+	 * @param id to set for this contact
+	 * @since Envoy Server Standalone v0.1-beta
+	 */
+	public void setID(long id) { this.id = id; }
+
+	/**
+	 * @return the name of this contact.
+	 * @since Envoy Server Standalone v0.1-beta
+	 */
+	public String getName() { return name; }
+
+	/**
+	 * Sets the name of this contact.
+	 * 
+	 * @param name to set for this contact
+	 * @since Envoy Server Standalone v0.1-beta
+	 */
+	public void setName(String name) { this.name = name; }
+}

src/main/java/envoy/server/data/Group.java

@@ -0,0 +1,54 @@
+package envoy.server.data;
+
+import java.util.List;
+import java.util.stream.Collectors;
+
+import javax.persistence.CascadeType;
+import javax.persistence.Entity;
+import javax.persistence.ManyToMany;
+import javax.persistence.NamedQueries;
+import javax.persistence.NamedQuery;
+import javax.persistence.Table;
+
+/**
+ * This class serves as a way to let Hibernate communicate with the server
+ * without bringing the dependency of JPA/Hibernate into the client.<br>
+ * It will be referenced as "database group" to clarify between the different
+ * group objects.<br>
+ * <br>
+ * Project: <strong>envoy-server-standalone</strong><br>
+ * File: <strong>Group.java</strong><br>
+ * Created: <strong>24.03.2020</strong><br>
+ * 
+ * @author Maximilian K&auml;fer
+ * @since Envoy Server Standalone v0.1-alpha
+ */
+@Entity
+@Table(name = "groups")
+@NamedQueries({ @NamedQuery(query = "SELECT g FROM Group g WHERE g.name = :name", name = "getGroupByName") })
+public class Group extends Contact {
+
+	@ManyToMany(targetEntity = Group.class, cascade = CascadeType.ALL)
+	private List<User> members;
+
+	/**
+	 * {@inheritDoc}
+	 */
+	@Override
+	public envoy.data.Group toCommon() { return new envoy.data.Group(id, name, members.stream().map(User::getID).collect(Collectors.toList())); }
+
+	/**
+	 * @return a list of all users that are a member of this group.
+	 * @since Envoy Server Standalone v0.1-beta
+	 */
+	public List<User> getMembers() { return members; }
+
+	/**
+	 * Sets the members of this group.
+	 * 
+	 * @param Members a list of all users, that should be assigned to this group.
+	 * @since Envoy Server Standalone v0.1-beta
+	 */
+	public void setMembers(List<User> members) { this.members = members; }
+
+}

src/main/java/envoy/server/data/Message.java

@@ -2,7 +2,15 @@ package envoy.server.data;
 
 import java.util.Date;
 
-import javax.persistence.*;
+import javax.persistence.CascadeType;
+import javax.persistence.Entity;
+import javax.persistence.Id;
+import javax.persistence.ManyToOne;
+import javax.persistence.NamedQueries;
+import javax.persistence.NamedQuery;
+import javax.persistence.Table;
+import javax.persistence.Temporal;
+import javax.persistence.TemporalType;
 
 import envoy.data.MessageBuilder;
 
@@ -89,7 +97,7 @@ public class Message {
 	 */
 	public envoy.data.Message toCommonMessage() {
 		// TODO: Attachment
-		envoy.data.Message message = new MessageBuilder(sender.getId(), recipient.getId(), id).setText(text)
+		envoy.data.Message message = new MessageBuilder(sender.getID(), recipient.getID(), id).setText(text)
 			.setDate(creationDate)
 			.setStatus(status)
 			.setForwarded(forwarded)
@@ -103,12 +111,12 @@ public class Message {
 	 * @return the id of a {link envoy.data.Message}
 	 * @since Envoy Server Standalone v0.1-alpha
 	 */
-	public long getId() { return id; }
+	public long getID() { return id; }
 
 	/**
 	 * @param id the id to set
 	 * @since Envoy Server Standalone v0.1-alpha
-	 * @see Message#getId()
+	 * @see Message#getID()
 	 */
 	public void setId(long id) { this.id = id; }
 

src/main/java/envoy/server/data/PersistenceManager.java

@@ -16,6 +16,7 @@ import envoy.server.net.ConnectionManager;
  * Created: <strong>1 Jan 2020</strong><br>
  *
  * @author Leon Hofmeister
+ * @author Maximilian K&auml;fer
  * @since Envoy Server Standalone v0.1-alpha
  */
 public class PersistenceManager {
@@ -49,12 +50,12 @@ public class PersistenceManager {
 	public static PersistenceManager getInstance() { return persistenceManager; }
 
 	/**
-	 * Adds a {@link User} to the database.
+	 * Adds a {@link Contact} to the database.
 	 *
-	 * @param user the {@link User} to add to the database
+	 * @param user the {@link Contact} to add to the database
 	 * @since Envoy Server Standalone v0.1-alpha
 	 */
-	public void addUser(User user) { persist(user); }
+	public void addContact(Contact contact) { persist(contact); }
 
 	/**
 	 * Adds a {@link Message} to the database.
@@ -73,12 +74,12 @@ public class PersistenceManager {
 	public void addConfigItem(ConfigItem configItem) { persist(configItem); }
 
 	/**
-	 * Updates a {@link User} in the database
+	 * Updates a {@link Contact} in the database
 	 *
-	 * @param user the {@link User} to add to the database
+	 * @param user the {@link Contact} to add to the database
 	 * @since Envoy Server Standalone v0.1-alpha
 	 */
-	public void updateUser(User user) { merge(user); }
+	public void updateContact(Contact contact) { merge(contact); }
 
 	/**
 	 * Updates a {@link Message} in the database.
@@ -97,12 +98,12 @@ public class PersistenceManager {
 	public void updateConfigItem(ConfigItem configItem) { merge(configItem); }
 
 	/**
-	 * Deletes a {@link User} in the database.
+	 * Deletes a {@link Contact} in the database.
 	 *
-	 * @param user the {@link User} to delete
+	 * @param user the {@link Contact} to delete
 	 * @since Envoy Server Standalone v0.1-alpha
 	 */
-	public void deleteUser(User user) { remove(user); }
+	public void deleteContact(Contact contact) { remove(contact); }
 
 	/**
 	 * Deletes a {@link Message} in the database.
@@ -113,7 +114,7 @@ public class PersistenceManager {
 	public void deleteMessage(Message message) { remove(message); }
 
 	/**
-	 * Searches for a {@link User} with a specific id.
+	 * Searches for a {@link User} with a specific ID.
 	 *
 	 * @param id the id to search for
 	 * @return the user with the specified id
@@ -121,6 +122,24 @@ public class PersistenceManager {
 	 */
 	public User getUserById(long id) { return entityManager.find(User.class, id); }
 
+	/**
+	 * Searches for a {@link Group} with a specific ID.
+	 * 
+	 * @param id the id to search for
+	 * @return the group with the specific id
+	 * @since Envoy Server Standalone v0.1-beta
+	 */
+	public Group getGroupById(long id) { return entityManager.find(Group.class, id); }
+
+	/**
+	 * Searches for a {@link Contact} with a specific ID.
+	 * 
+	 * @param id the id to search for
+	 * @return the contact with the specific id
+	 * @since Envoy Server Standalone v0.1-beta
+	 */
+	public Contact getContactById(long id) { return entityManager.find(Contact.class, id); }
+
 	/**
 	 * Searched for a {@link User} with a specific name.
 	 *
@@ -132,6 +151,28 @@ public class PersistenceManager {
 		return (User) entityManager.createNamedQuery("getUserByName").setParameter("name", name).getSingleResult();
 	}
 
+	/**
+	 * Searched for a {@link Group} with a specific name.
+	 *
+	 * @param name the name of the group
+	 * @return the group with the specified name
+	 * @since Envoy Server Standalone v0.1-alpha
+	 */
+	public Group getGroupByName(String name) {
+		return (Group) entityManager.createNamedQuery("getGroupByName").setParameter("name", name).getSingleResult();
+	}
+
+	/**
+	 * Searched for a {@link Contact} with a specific name.
+	 *
+	 * @param name the name of the contact
+	 * @return the contact with the specified name
+	 * @since Envoy Server Standalone v0.1-alpha
+	 */
+	public Contact getContactByName(String name) {
+		return (Contact) entityManager.createNamedQuery("getContactByName").setParameter("name", name).getSingleResult();
+	}
+
 	/**
 	 * Searches for a {@link Message} with a specific id.
 	 *
@@ -183,7 +224,7 @@ public class PersistenceManager {
 	 * @param userId2 the ID of the second user
 	 * @since Envoy Server Standalone v0.1-alpha
 	 */
-	public void addContact(long userId1, long userId2) {
+	public void addUserContact(long userId1, long userId2) {
 
 		// Get users by ID
 		User	u1	= getUserById(userId1);

src/main/java/envoy/server/data/User.java

@@ -31,12 +31,8 @@ import javax.persistence.*;
 		name = "searchUsers"
 	) }
 )
-public class User {
+public class User extends Contact {
 
-	@Id
-	@GeneratedValue(strategy = GenerationType.IDENTITY)
-	private long	id;
-	private String	name;
 	private byte[]	passwordHash;
 
 	@Temporal(TemporalType.TIMESTAMP)
@@ -47,55 +43,10 @@ public class User {
 	private List<User> contacts;
 
 	/**
-	 * Creates an instance of {@link User}.
-	 *
-	 * @since Envoy Server Standalone v0.1-alpha
+	 * {@inheritDoc}
 	 */
-	public User() {}
-
-	/**
-	 * Creates an instance of {@link User}.
-	 *
-	 * @param user the {@link envoy.data.User} to convert
-	 * @since Envoy Server Standalone v0.1-alpha
-	 */
-	public User(envoy.data.User user) {
-		id		= user.getId();
-		name	= user.getName();
-		status	= user.getStatus();
-	}
-
-	/**
-	 * @return a database {@link User} converted into an {@link envoy.data.User}
-	 * @since Envoy Server Standalone v0.1-alpha
-	 */
-	public envoy.data.User toCommonUser() { return new envoy.data.User(id, name, status); }
-
-	/**
-	 * @return the id of a {link envoy.data.User}
-	 * @since Envoy Server Standalone v0.1-alpha
-	 */
-	public long getId() { return id; }
-
-	/**
-	 * @param id the id to set
-	 * @since Envoy Server Standalone v0.1-alpha
-	 * @see User#getId
-	 */
-	public void setId(long id) { this.id = id; }
-
-	/**
-	 * @return the name of a {link envoy.data.User}
-	 * @since Envoy Server Standalone v0.1-alpha
-	 */
-	public String getName() { return name; }
-
-	/**
-	 * @param name the username to set
-	 * @since Envoy Server Standalone v0.1-alpha
-	 * @see User#getName()
-	 */
-	public void setName(String name) { this.name = name; }
+	@Override
+	public envoy.data.User toCommon() { return new envoy.data.User(id, name, status); }
 
 	/**
 	 * @return the passwordHash of a {link envoy.data.User}
@@ -148,4 +99,5 @@ public class User {
 	 * @see User#getContacts()
 	 */
 	public void setContacts(List<User> contacts) { this.contacts = contacts; }
+
 }

src/main/java/envoy/server/net/ConnectionManager.java

@@ -1,6 +1,10 @@
 package envoy.server.net;
 
-import java.util.*;
+import java.util.Date;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
 
 import com.jenkov.nioserver.ISocketIdListener;
 

src/main/java/envoy/server/processors/ContactOperationProcessor.java

@@ -29,11 +29,11 @@ public class ContactOperationProcessor implements ObjectProcessor<ContactOperati
 				final long contactId = evt.get().getId();
 
 				System.out.printf("Adding user %s to the contact list of user %d.%n", evt.get(), userId);
-				PersistenceManager.getInstance().addContact(userId, contactId);
+				PersistenceManager.getInstance().addUserContact(userId, contactId);
 
 				// Notify the contact if online
 				if (ConnectionManager.getInstance().isOnline(contactId)) writeProxy.write(connectionManager.getSocketId(contactId),
-						new Contacts(Arrays.asList(PersistenceManager.getInstance().getUserById(userId).toCommonUser())));
+						new Contacts(Arrays.asList(PersistenceManager.getInstance().getUserById(userId).toCommon())));
 				break;
 			default:
 				System.err.printf("Received %s with an unsupported operation.%n", evt);

src/main/java/envoy/server/processors/ContactsRequestEventProcessor.java

@@ -35,7 +35,7 @@ public class ContactsRequestEventProcessor implements ObjectProcessor<ContactSea
 				new ContactSearchResult(PersistenceManager.getInstance()
 					.searchUsers(request.get(), ConnectionManager.getInstance().getUserIdBySocketId(socketId))
 					.stream()
-					.map(User::toCommonUser)
+					.map(User::toCommon)
 					.collect(Collectors.toList())));
 	}
 

src/main/java/envoy/server/processors/IDGeneratorRequestProcessor.java

@@ -2,8 +2,8 @@ package envoy.server.processors;
 
 import java.io.IOException;
 
-import envoy.data.IdGenerator;
-import envoy.event.IdGeneratorRequest;
+import envoy.data.IDGenerator;
+import envoy.event.IDGeneratorRequest;
 import envoy.server.data.ConfigItem;
 import envoy.server.data.PersistenceManager;
 import envoy.server.net.ObjectWriteProxy;
@@ -16,19 +16,19 @@ import envoy.server.net.ObjectWriteProxy;
  * @author Kai S. K. Engelbart
  * @since Envoy Server Standalone v0.1-alpha
  */
-public class IDGeneratorRequestProcessor implements ObjectProcessor<IdGeneratorRequest> {
+public class IDGeneratorRequestProcessor implements ObjectProcessor<IDGeneratorRequest> {
 
 	private static final long ID_RANGE = 200;
 
 	@Override
-	public Class<IdGeneratorRequest> getInputClass() { return IdGeneratorRequest.class; }
+	public Class<IDGeneratorRequest> getInputClass() { return IDGeneratorRequest.class; }
 
 	@Override
-	public void process(IdGeneratorRequest input, long socketId, ObjectWriteProxy writeProxy) throws IOException {
+	public void process(IDGeneratorRequest input, long socketId, ObjectWriteProxy writeProxy) throws IOException {
 		System.out.println("Received id generation request.");
 
 		ConfigItem	currentId	= PersistenceManager.getInstance().getConfigItemById("currentMessageId");
-		IdGenerator	generator	= new IdGenerator(Integer.parseInt(currentId.getValue()), ID_RANGE);
+		IDGenerator	generator	= new IDGenerator(Integer.parseInt(currentId.getValue()), ID_RANGE);
 		currentId.setValue(String.valueOf(Integer.parseInt(currentId.getValue()) + ID_RANGE));
 		PersistenceManager.getInstance().updateConfigItem(currentId);
 

src/main/java/envoy/server/processors/LoginCredentialProcessor.java

@@ -1,7 +1,11 @@
 package envoy.server.processors;
 
 import java.io.IOException;
-import java.util.*;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Date;
+import java.util.InputMismatchException;
+import java.util.List;
 import java.util.stream.Collectors;
 
 import javax.persistence.NoResultException;
@@ -45,7 +49,7 @@ public class LoginCredentialProcessor implements ObjectProcessor<LoginCredential
 			System.out.println("Rejecting handshake on socket " + socketId);
 			return;
 		}
-		connectionManager.registerUser(user.getId(), socketId);
+		connectionManager.registerUser(user.getID(), socketId);
 
 		// Notifies contacts of this users online-going and updates his status in the
 		// database
@@ -53,12 +57,12 @@ public class LoginCredentialProcessor implements ObjectProcessor<LoginCredential
 		UserStatusChangeProcessor.updateUserStatus(user);
 
 		// Create contacts
-		Contacts contacts = new Contacts(user.getContacts().stream().map(envoy.server.data.User::toCommonUser).collect(Collectors.toList()));
-		contacts.getContacts().add(user.toCommonUser());
+		Contacts contacts = new Contacts(user.getContacts().stream().map(envoy.server.data.User::toCommon).collect(Collectors.toList()));
+		contacts.getContacts().add(user.toCommon());
 
 		// Complete handshake
 		System.out.println("Sending user...");
-		writeProxy.write(socketId, user.toCommonUser());
+		writeProxy.write(socketId, user.toCommon());
 		System.out.println("Sending contacts...");
 		writeProxy.write(socketId, contacts);
 		System.out.println("Acquiring pending messages for the client...");
@@ -94,7 +98,7 @@ public class LoginCredentialProcessor implements ObjectProcessor<LoginCredential
 			envoy.server.data.User user = persistenceManager.getUserByName(credentials.getIdentifier());
 
 			// Checking if user is already online
-			if (connectionManager.isOnline(user.getId())) {
+			if (connectionManager.isOnline(user.getID())) {
 				writeProxy.write(socketId, new HandshakeRejectionEvent(HandshakeRejectionEvent.ALREADY_ONLINE));
 				return null;
 			}
@@ -140,7 +144,7 @@ public class LoginCredentialProcessor implements ObjectProcessor<LoginCredential
 			user.setStatus(User.UserStatus.ONLINE);
 			user.setPasswordHash(credentials.getPasswordHash());
 			user.setContacts(new ArrayList<>());
-			persistenceManager.addUser(user);
+			persistenceManager.addContact(user);
 			return user;
 		}
 	}

src/main/java/envoy/server/processors/MessageStatusChangeProcessor.java

@@ -33,7 +33,7 @@ public class MessageStatusChangeProcessor implements ObjectProcessor<MessageStat
 		persistenceManager.updateMessage(msg);
 
 		// Notifies the sender of the message about the status-update to READ
-		final long senderId = msg.getSender().getId();
+		final long senderId = msg.getSender().getID();
 		if (connectionManager.isOnline(senderId)) writeProxy.write(connectionManager.getSocketId(senderId), input);
 	}
 

src/main/java/envoy/server/processors/UserStatusChangeProcessor.java

@@ -48,7 +48,7 @@ public class UserStatusChangeProcessor implements ObjectProcessor<UserStatusChan
 
 	public static void updateUserStatus(User user) {
 		// handling for newly logged in clients
-		persistenceManager.updateUser(user);
+		persistenceManager.updateContact(user);
 
 		// handling for contacts that are already online
 		notifyContacts(user);
@@ -68,11 +68,11 @@ public class UserStatusChangeProcessor implements ObjectProcessor<UserStatusChan
 	 * @since Envoy Server Standalone v0.1-alpha
 	 */
 	private static void notifyContacts(User user) {
-		UserStatusChangeEvent	evt					= new UserStatusChangeEvent(user.getId(), user.getStatus());
+		UserStatusChangeEvent	evt					= new UserStatusChangeEvent(user.getID(), user.getStatus());
 		ConnectionManager		connectionManager	= ConnectionManager.getInstance();
 		try {
 			for (User contact : user.getContacts())
-				if (connectionManager.isOnline(contact.getId())) writeProxy.write(connectionManager.getSocketId(contact.getId()), evt);
+				if (connectionManager.isOnline(contact.getID())) writeProxy.write(connectionManager.getSocketId(contact.getID()), evt);
 		} catch (IOException e) {
 			e.printStackTrace();
 			System.err.println("Could not notify online contacts of user " + evt.getId() + " that his status has been changed");