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package com.example.spring.security.entity;
import java.util.Collection;
import java.util.Date;
import java.util.HashSet;
import java.util.Set;
import java.util.stream.Collectors;
import org.hibernate.annotations.CreationTimestamp;
import org.hibernate.annotations.UpdateTimestamp;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.security.core.userdetails.UserDetails;
import jakarta.persistence.CollectionTable;
import jakarta.persistence.Column;
import jakarta.persistence.ElementCollection;
import jakarta.persistence.Entity;
import jakarta.persistence.FetchType;
import jakarta.persistence.GeneratedValue;
import jakarta.persistence.GenerationType;
import jakarta.persistence.Id;
import jakarta.persistence.JoinColumn;
import jakarta.persistence.Table;
/*
@Table - Used to set the database table name explicitely.
*/
@Entity
@Table(name = "user_account")
public class User implements UserDetails {
/*
* GenerationType.IDENTITY - Auto generate value based on database's native auto
* increment feature
*/
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
@Column(unique = true)
private String username;
private String password;
@Column(nullable = false)
private String description;
@CreationTimestamp
@Column(updatable = false, name = "created_at")
private Date createdAt;
@UpdateTimestamp
@Column(name = "updated_at")
private Date updatedAt;
/*
* @ElementCollection: Marks the field as a collection of basic types (Strings,
* Integers, etc.) or embeddable objects.
*
* @CollectionTable: Customizes the junction table details. If omitted, JPA
* generates a default table name combining the entity name and the field name
* (e.g., User_roles).
*
* @Column: Defines the column name for the String values inside the collection
* table.
*
* Fetch Type: By default, element collections use FetchType.LAZY. If you access
* the set outside of an active transaction or Hibernate session, it throws a
* LazyInitializationException. You can switch it to fetch = FetchType.EAGER to
* load the strings immediately alongside the main entity.
*
*/
@ElementCollection(fetch = FetchType.EAGER)
@CollectionTable(name = "user_roles", // Name of the separate collection table
joinColumns = @JoinColumn(name = "user_id") // Foreign key linking back to this entity
)
@Column(name = "role_name") // Name of the column storing the actual String values
private Set<String> roles = new HashSet<>(); // e.g., ["ADMIN", "USER"]
@Override
public Collection<? extends GrantedAuthority> getAuthorities() {
return roles.stream()
.map(role -> new SimpleGrantedAuthority("ROLE_" + role))
.collect(Collectors.toList());
}
@Override
public String getPassword() {
return password;
}
@Override
public String getUsername() {
return username;
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public void setUsername(String username) {
this.username = username;
}
public void setPassword(String password) {
this.password = password;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public Date getCreatedAt() {
return createdAt;
}
public void setCreatedAt(Date createdAt) {
this.createdAt = createdAt;
}
public Date getUpdatedAt() {
return updatedAt;
}
public void setUpdatedAt(Date updatedAt) {
this.updatedAt = updatedAt;
}
public Set<String> getRoles() {
return roles;
}
public void setRoles(Set<String> roles) {
this.roles = roles;
}
}
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