This is a part of an online Codename One course published around 2017 see it all for free at https://debugagent.com/series/cn1

1. Creating a WhatsApp Clone - Part XII

2. @Entity
@Indexed
public class ChatGroup {
@Id
private String id;
@Field
private String name;
@Field
private String tagline;
@Temporal(TemporalType.DATE)
private Date creationDate;
@ManyToOne
private Media avatar;
ChatGroup

3. @Entity
@Indexed
public class ChatGroup {
@Id
private String id;
@Field
private String name;
@Field
private String tagline;
@Temporal(TemporalType.DATE)
private Date creationDate;
@ManyToOne
private Media avatar;
ChatGroup

4. @Temporal(TemporalType.DATE)
private Date creationDate;
@ManyToOne
private Media avatar;
@ManyToOne
private User createdBy;
@OneToMany
@OrderBy("name ASC")
private Set<User> admins;
@OneToMany
@OrderBy("name ASC")
private Set<User> members;
public ChatGroup() {
id = UUID.randomUUID().toString();
}
ChatGroup

5. @Temporal(TemporalType.DATE)
private Date creationDate;
@ManyToOne
private Media avatar;
@ManyToOne
private User createdBy;
@OneToMany
@OrderBy("name ASC")
private Set<User> admins;
@OneToMany
@OrderBy("name ASC")
private Set<User> members;
public ChatGroup() {
id = UUID.randomUUID().toString();
}
ChatGroup

6. package com.codename1.whatsapp.server.entities;
import org.springframework.data.repository.CrudRepository;
public interface ChatGroupRepository extends
CrudRepository<ChatGroup, String> {
}
ChatGroupRepository

7. @Entity
@Indexed
public class ChatMessage {
@Id
private String id;
@ManyToOne
private User author;
@ManyToOne
private User sentTo;
@ManyToOne
private ChatGroup sentToGroup;
@Temporal(TemporalType.TIMESTAMP)
private Date messageTime;
private String body;
ChatMessage

8. @Entity
@Indexed
public class ChatMessage {
@Id
private String id;
@ManyToOne
private User author;
@ManyToOne
private User sentTo;
@ManyToOne
private ChatGroup sentToGroup;
@Temporal(TemporalType.TIMESTAMP)
private Date messageTime;
private String body;
ChatMessage

9. @Entity
@Indexed
public class ChatMessage {
@Id
private String id;
@ManyToOne
private User author;
@ManyToOne
private User sentTo;
@ManyToOne
private ChatGroup sentToGroup;
@Temporal(TemporalType.TIMESTAMP)
private Date messageTime;
private String body;
ChatGroupRepository

10. private User author;
@ManyToOne
private User sentTo;
@ManyToOne
private ChatGroup sentToGroup;
@Temporal(TemporalType.TIMESTAMP)
private Date messageTime;
private String body;
private boolean ack;
@OneToMany
@OrderBy("date ASC")
private Set<Media> attachments;
public ChatMessage() {
id = UUID.randomUUID().toString();
}
ChatMessage

11. private User author;
@ManyToOne
private User sentTo;
@ManyToOne
private ChatGroup sentToGroup;
@Temporal(TemporalType.TIMESTAMP)
private Date messageTime;
private String body;
private boolean ack;
@OneToMany
@OrderBy("date ASC")
private Set<Media> attachments;
public ChatMessage() {
id = UUID.randomUUID().toString();
}
ChatMessage

12. private User author;
@ManyToOne
private User sentTo;
@ManyToOne
private ChatGroup sentToGroup;
@Temporal(TemporalType.TIMESTAMP)
private Date messageTime;
private String body;
private boolean ack;
@OneToMany
@OrderBy("date ASC")
private Set<Media> attachments;
public ChatMessage() {
id = UUID.randomUUID().toString();
}
ChatMessage

13. private User author;
@ManyToOne
private User sentTo;
@ManyToOne
private ChatGroup sentToGroup;
@Temporal(TemporalType.TIMESTAMP)
private Date messageTime;
private String body;
private boolean ack;
@OneToMany
@OrderBy("date ASC")
private Set<Media> attachments;
public ChatMessage() {
id = UUID.randomUUID().toString();
}
ChatMessage

14. @OrderBy("date ASC")
private Set<Media> attachments;
public ChatMessage() {
id = UUID.randomUUID().toString();
}
public MessageDAO getDAO() {
String[] a;
if(attachments != null && !attachments.isEmpty()) {
a = new String[attachments.size()];
Iterator<Media> i = attachments.iterator();
for(int iter = 0 ; iter < a.length ; iter++) {
a[iter] = i.next().getId();
}
} else {
a = new String[0];
}
return new MessageDAO(id, author.getId(),
sentTo != null ? sentTo.getId() : sentToGroup.getId(),
messageTime, body, a);
}
ChatMessage

15. package com.codename1.whatsapp.server.entities;
import java.util.List;
import org.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.CrudRepository;
public interface ChatMessageRepository extends
CrudRepository<ChatMessage, String> {
@Query("select n from ChatMessage n where n.ack = false and "
+ "n.sentTo.id = ?1 order by messageTime asc")
public List<ChatMessage> findByUnAcked(String sentTo);
}
ChatMessageRepository

16. import com.fasterxml.jackson.annotation.JsonFormat;
import java.util.Date;
public class MessageDAO {
private String id;
private String authorId;
private String sentTo;
@JsonFormat(pattern="yyyy-MM-dd'T'HH:mm:ss.SSS")
private Date time;
private String body;
private String[] attachments;
public MessageDAO() {
}
public MessageDAO(String id, String authorId, String sentTo,
Date time, String body, String[] attachments) {
this.id = id;
this.authorId = authorId;
this.sentTo = sentTo;
this.time = time;
MessageDAO