/*
* Copyright (c) 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.db;
import org.eurekastreams.server.persistence.mappers.BaseArgDomainMapper;
import org.eurekastreams.server.persistence.mappers.requests.GetRelatedEntityCountRequest;
/**
* Return count of related entities.
*/
public class GetRelatedEntityCount extends BaseArgDomainMapper<GetRelatedEntityCountRequest, Long>
{
/**
* Return count of related entities for given entity.
*
* @param inRequest
* {@link GetRelatedEntityCountRequest}.
* @return Count of related entities.
*/
@Override
public Long execute(final GetRelatedEntityCountRequest inRequest)
{
String whereClause = (inRequest.getWhereClauseAddition() == null) ? "" : inRequest.getWhereClauseAddition();
return (Long) getEntityManager().createQuery(
"SELECT Count(id) FROM " + inRequest.getRelatedEntityName() + " WHERE "
+ inRequest.getTargetEntityFieldName() + ".id = :id " + whereClause).setParameter("id",
inRequest.getTargetEntityId()).getSingleResult();
}
}