/*
 * Copyright (c) 2011 Lockheed Martin Corporation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.eurekastreams.server.persistence.mappers.db.notification;

import java.util.List;

import javax.persistence.Query;

import org.eurekastreams.server.domain.InAppNotificationEntity;
import org.eurekastreams.server.persistence.mappers.BaseArgDomainMapper;

/**
 * This mapper returns the details of an existing in-app notification for a recipient, notification type, and URL if one
 * exists.
 */
public class GetExistingInAppNotificationForAggregation extends
        BaseArgDomainMapper<InAppNotificationEntity, InAppNotificationEntity>
{

    /**
     * Queries the database for an existing notification for a user and URL.
     * 
     * @param inRequest
     *            Container for search criteria. Callers should populate the recipient, notification type, and url
     *            properties
     * @return An existing unread notification that matches the search criteria.
     */
    @Override
    public InAppNotificationEntity execute(final InAppNotificationEntity inRequest)
    {
        String q = "from InAppNotification where recipient.id = :userId " + "and url = :url and isRead = false "
                + "and notificationType = :notificationType";
        Query query = getEntityManager().createQuery(q).setParameter("userId", inRequest.getRecipient().getId())
                .setParameter("url", inRequest.getUrl())
                .setParameter("notificationType", inRequest.getNotificationType());
        List results = query.getResultList();
        if (results.size() < 1)
        {
            return null;
        }
        return (InAppNotificationEntity) results.get(0);
    }

}