BaseEntity.java

package org.brixcms.plugin.usermgmt;

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

import org.brixcms.plugin.jpa.Persistable;

/**
 * @author dan.simko@gmail.com
 */
@MappedSuperclass
@SuppressWarnings("serial")
public abstract class BaseEntity implements Persistable<Long> {

    private Long id;
    private int version;

    @Id
    @Override
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    public Long getId() {
        return id;
    }

    @Override
    @Transient
    public boolean isNew() {
        return getId() == null;
    }

    @Version
    protected int getVersion() {
        return version;
    }

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

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

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((id == null) ? 0 : id.hashCode());
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        BaseEntity other = (BaseEntity) obj;
        if (id == null) {
            if (other.id != null)
                return false;
        } else if (!id.equals(other.id))
            return false;
        return true;
    }

}