IdEntity.java

package org.tests.sp.model;

import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.MappedSuperclass;
import javax.persistence.Version;

@MappedSuperclass
public abstract class IdEntity {

  @Id
  @GeneratedValue(strategy = GenerationType.SEQUENCE)
  protected Long id;

  @Version
  private int version;

  public int getVersion() {
    return version;
  }

  public void setVersion(int version) {
    this.version = version;
  }

  public Long getId() {
    return id;
  }

  public void setId(Long id) {
    this.id = id;
  }

  @Override
  public int hashCode() {
    return id == null ? 31 : 31 + 31 * id.hashCode();
  }

  @Override
  public boolean equals(Object obj) {

    if (this == obj)
      return true;

    if (obj == null || !this.getClass().isInstance(obj))
      return false;

    IdEntity o = (IdEntity) obj;

    return id != null && o.id != null && id.equals(o.id);
  }

  @Override
  public String toString() {
    return this.getClass().getSimpleName() + "[" + id + "]";
  }
}