BaseEntity.java

package ru.javawebinar.topjava.model;

import ru.javawebinar.topjava.LoggerWrapper;

import javax.persistence.Access;
import javax.persistence.AccessType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.MappedSuperclass;
import javax.persistence.SequenceGenerator;
import java.io.Serializable;

/**
 * User: gkislin
 * Date: 22.08.2014
 */
@MappedSuperclass
@Access(AccessType.FIELD)
//@JsonAutoDetect(fieldVisibility = ANY, getterVisibility = NONE, isGetterVisibility = NONE, setterVisibility = NONE)
public class BaseEntity implements Serializable{
    protected static final LoggerWrapper LOG = LoggerWrapper.get(BaseEntity.class);

    public static final int START_SEQ = 100000;

    @Id
    @SequenceGenerator(name = "global_seq", sequenceName = "global_seq", allocationSize = 1)
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "global_seq")
    protected Integer id;

    public BaseEntity() {
    }

    protected BaseEntity(Integer id) {
        this.id = id;
    }

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

    public Integer getId() {
        return id;
    }

    public boolean isNew() {
        return (this.id == null);
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        BaseEntity that = (BaseEntity) o;
        if (id == null || that.id == null) {
            throw LOG.getIllegalStateException("Equals '" + this + "' and '" + that + "' with null id");
        }
        return id.equals(that.id);
    }

    @Override
    public int hashCode() {
        return (id == null) ? 0 : id;
    }
}