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package org.hibernate.examples.model;

import org.hibernate.examples.utils.HashTool;
import org.hibernate.examples.utils.ToStringHelper;

import javax.persistence.MappedSuperclass;
import javax.persistence.PostLoad;
import javax.persistence.PostPersist;
import java.io.Serializable;

/**
 * Hibernate Entity의 최상위 추상화 클래스입니다.
 *
 * @author 배성혁 [email protected]
 * @since 2013. 11. 27. 오후 2:36
 */
@MappedSuperclass
public abstract class AbstractHibernateEntity
        extends AbstractPersistentObject implements HibernateEntity {

    abstract public TId getId();

    // NOTE: JPA 에서는 #onSave(), #onLoad() 를 @MappedSuperclass 나 @Entity 에 재정의해야한다.
    // NOTE: Hibernate 에서는 Interceptor에서 관리하므로, {@link AbstractPersistentObject}에만 정의해도 된다.

    @Override
    @PostPersist
    public final void onSave() {
        setPersisted(true);
    }

    @Override
    @PostLoad
    public final void onLoad() {
        setPersisted(true);
    }


    @Override
    @SuppressWarnings("unchecked")
    public boolean equals(Object obj) {
        boolean isSampeType = (obj != null) && getClass().equals(obj.getClass());

        if (isSampeType) {
            HibernateEntity entity = (HibernateEntity) obj;
            return hasSameNonDefaultIdAs(entity) ||
                   ((!isPersisted() || !entity.isPersisted()) && hasSameBusinessSignature(entity));
        }
        return false;
    }

    @Override
    public int hashCode() {
        return (getId() == null) ? System.identityHashCode(this)
                                 : HashTool.compute(getId());
    }

    private boolean hasSameNonDefaultIdAs(HibernateEntity entity) {
        if (entity == null) return false;

        TId id = getId();
        TId entityId = entity.getId();
        return (id != null) && (entityId != null) && (id.equals(entityId));
    }

    private boolean hasSameBusinessSignature(HibernateEntity other) {
        boolean notNull = (other != null);
        int hash = (getId() != null) ? HashTool.compute(getId()) : hashCode();
        if (notNull) {
            int otherHash = (other.getId() != null) ? HashTool.compute(other.getId()) : other.hashCode();
            return hash == otherHash;
        }
        return false;
    }

    @Override
    public ToStringHelper buildStringHelper() {
        return super.buildStringHelper()
                    .add("id", getId());
    }

    private static final long serialVersionUID = 6661386933952675946L;
}