EntityBase.java

package kr.hconnect.data.model;

import com.google.common.base.Objects;
import kr.hconnect.core.tools.HashTool;
import lombok.Getter;
import lombok.Setter;

/**
 * Hibernate, JPA 의 모든 엔티티의 기본 클래스입니다.
 *
 * @author 배성혁 sunghyouk.bae@gmail.com
 * @since 13. 6. 30. 오후 1:03
 */
@Getter
@Setter
abstract public class EntityBase<TId> extends PersistentObjectBase implements Entity<TId> {

    abstract public TId getId();

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

        if (isSampeType) {
            Entity<TId> entity = (Entity<TId>) 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(Entity<TId> entity) {
        if (entity == null) return false;

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

    private boolean hasSameBusinessSignature(Entity<TId> 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 Objects.ToStringHelper buildStringHelper() {
        return super.buildStringHelper()
                    .add("id", getId());
    }

    private static final long serialVersionUID = -4403625911423688674L;

}