/*
 * Copyright (c) 2009-2010 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;

import javax.persistence.Query;

import org.eurekastreams.server.domain.stream.LikedActivity;
import org.eurekastreams.server.persistence.mappers.cache.CacheKeys;
import org.eurekastreams.server.persistence.mappers.stream.CachedDomainMapper;

/**
 * Insert entry into LikedActivity table.
 * 
 */
public class InsertLikedActivity extends CachedDomainMapper
{
    /**
     * Inserts entry into LikedActivity table.
     * 
     * @param inLikedActivity
     *            the {@link LikedActivity} to insert.
     * @return True if successful.
     */
    public Boolean execute(final LikedActivity inLikedActivity)
    {
        Query q = getEntityManager().createQuery(
                "FROM LikedActivity where personId=:personId and activityId=:activityId").setParameter("personId",
                inLikedActivity.getPersonId()).setParameter("activityId", inLikedActivity.getActivityId());

        if (q.getResultList().size() > 0)
        {
            // already liked
            return Boolean.TRUE;
        }

        this.getEntityManager().persist(inLikedActivity);

        // delete from cache, this list needs to be regenerated ordered.
        getCache().delete(CacheKeys.LIKED_BY_PERSON_ID + inLikedActivity.getPersonId());

        getCache().addToTopOfList(CacheKeys.LIKERS_BY_ACTIVITY_ID + inLikedActivity.getActivityId(),
                inLikedActivity.getPersonId());

        return Boolean.TRUE;
    }

}