com.mycompany.bookstore.entity.BaseEntity2.java Source code

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Here is the source code for com.mycompany.bookstore.entity.BaseEntity2.java

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package com.mycompany.bookstore.entity;

import java.io.Serializable;

import org.hibernate.proxy.HibernateProxyHelper;

/**
 * Base class for all JPA entities.
 * 
 * @author Rodrigo Ucha (http://rodrigouchoa.wordpress.com)
 *
 */
public abstract class BaseEntity2<T extends Serializable> {

    /**
     * This method should return the primary key.
     * 
     * @return
     */
    public abstract T getId();

    /* As a starting point, we provide a basic mean for entities
     * to test for equality using their "id".
     * 
     * Please note that THIS IS NOT ALWAYS ACCEPTABLE since newly generated
     * ids might break Set/Collection semantics. Please refer to the documentarion
     * before doing something like this.
     * 
     */
    @SuppressWarnings("unchecked")
    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (!(obj instanceof BaseEntity2)) {
            return false;
        }
        if (getId() == null || ((BaseEntity2<?>) obj).getId() == null) {
            return false;
        }
        if (!getId().equals(((BaseEntity2<?>) obj).getId())) {
            return false;
        }
        if (!HibernateProxyHelper.getClassWithoutInitializingProxy(obj).isAssignableFrom(this.getClass())) {
            return false;
        }
        return true;
    }

    @Override
    public int hashCode() {
        return getId() == null ? super.hashCode() : getId().hashCode();
    }

}