/*
 * Copyright (c) 2009 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 java.util.Collection;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

import javax.persistence.Query;

import org.eurekastreams.server.persistence.mappers.ReadMapper;

/**
 * Get a list of all private group ids under a collection of organizations.
 */
public class GetPrivateGroupIdsUnderOrganizations extends
        ReadMapper<Collection<Long>, Set<Long>>
{
    /**
     * Get a set of the ids of private Domain Groups directly under any of the
     * orgs in the input collection of organization ids.
     * 
     * @param inOrgIds
     *            the org ids to look for private groups under
     * @return a set of group ids that directly report under
     */
    @Override
    @SuppressWarnings("unchecked")
    public Set<Long> execute(final Collection<Long> inOrgIds)
    {
        HashSet<Long> groupIds = new HashSet<Long>();

        if (inOrgIds.size() > 0)
        {
            StringBuilder sb = new StringBuilder();
            for (Long orgId : inOrgIds)
            {
                if (sb.length() > 0)
                {
                    sb.append(",");
                }
                sb.append(orgId);
            }

            Query q = getEntityManager().createQuery(
                    "SELECT g.id FROM DomainGroup g, Organization o "
                            + "WHERE o.id IN(" + sb.toString() + ") "
                            + "AND g.parentOrganization = o "
                            + "AND g.publicGroup = false");
            groupIds.addAll((List<Long>) q.getResultList());
        }
        return groupIds;
    }
}