package com.ankurm.hibernatedemo.persistenceannotations;

import jakarta.persistence.Entity;
import jakarta.persistence.GeneratedValue;
import jakarta.persistence.Id;

/**
 * Deliberately relies on the JPA/Hibernate DEFAULT {@code equals()}/{@code hashCode()}
 * (identity-based, inherited from Object) with a surrogate {@code @GeneratedValue} id that is
 * null until the first flush. This is the entity used to reproduce the classic
 * "HashSet.contains() returns false after persist()" symptom.
 *
 * <p>Docs: docs/05-jpa-persistence-annotations.md, Topic 2.
 */
@Entity
public class IdentityHashSetEntity {

    @Id
    @GeneratedValue
    private Long id;

    private String label;

    public IdentityHashSetEntity() {
    }

    public IdentityHashSetEntity(String label) {
        this.label = label;
    }

    public Long getId() {
        return id;
    }

    public String getLabel() {
        return label;
    }

    // Deliberately NOT overriding equals()/hashCode() -- uses Object identity.
    // A second class below overrides them using the surrogate id, to show that trap too.
}