3 ObjectModel

We want to write a simple applications where users can store contacts. In this section we create the data model of our application. For this we need two classes annotated with JPA Annotations: User and Contact. In the src/main/java/org/jpasecurity folder we create the subfolders contacts/model. Within the created folder we create two files named User.java and Contact.java:

    
package org.jpasecurity.contacts.model;

import javax.persistence.Basic;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;

@Entity
public class User {

    @Id @GeneratedValue(strategy = GenerationType.AUTO)
    private int id;
    @Basic
    private String name;
    
    public User() {
    }
    
    public User(String name) {
        setName(name);
    }
    
    public int getId() {
        return id;
    }
    
    protected void setId(int id) {
        this.id = id;
    }
    
    public String getName() {
        return name;
    }
    
    public void setName(String name) {
        this.name = name;
    }
    
    public boolean equals(Object object) {
        if (!(object instanceof User)) {
            return false;
        }
        User user = (User)object;
        return getName().equals(user.getName());
    }
    
    public int hashCode() {
        return getName().hashCode();
    }
}

package org.jpasecurity.contacts.model;

import javax.persistence.Basic;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.ManyToOne;

@Entity
public class Contact {

    @Id @GeneratedValue(strategy = GenerationType.AUTO)
    private int id;
    @ManyToOne
    private User owner;
    @Basic
    private String text;
    
    public Contact() {
    }
    
    public Contact(User owner, String text) {
        setOwner(owner);
        setText(text);
    }
    
    public int getId() {
        return id;
    }
    
    protected void setId(int id) {
        this.id = id;
    }
    
    public User getOwner() {
        return owner;
    }
    
    public void setOwner(User owner) {
        this.owner = owner;
    }

    public String getText() {
        return text;
    }
    
    public void setText(String text) {
        this.text = text;
    }
    
    public boolean equals(Object object) {
        if (!(object instanceof Contact)) {
            return false;
        }
        Contact contact = (Contact)object;
        return getOwner().equals(contact.getOwner()) && getText().equals(contact.getText());
    }
    
    public int hashCode() {
        return getOwner().hashCode() ^ getText().hashCode();
    }
}