/*
* 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;
import java.util.ArrayList;
import java.util.List;
import org.eurekastreams.server.domain.EntityType;
import org.eurekastreams.server.domain.stream.ActivityDTO;
import org.eurekastreams.server.domain.stream.StreamEntityDTO;
/**
* Mapper to get a list of person ids for people following the destination stream of an activity.
*/
public class GetPersonIdsFollowingActivityDestinationStreamMapper implements DomainMapper<ActivityDTO, List<Long>>
{
/**
* Mapper to get followers of a person.
*/
private DomainMapper<Long, List<Long>> personFollowersMapper;
/**
* Mapper to get person id from accountid.
*/
private DomainMapper<String, Long> getPersonIdFromAccountIdMapper;
/**
* Default constructor.
*
* @param inPersonFollowersMapper
* the person follower mapper.
* @param inGetPersonIdFromAccountIdMapper
* mapper to get person id frmo account id
*/
public GetPersonIdsFollowingActivityDestinationStreamMapper(
final DomainMapper<Long, List<Long>> inPersonFollowersMapper,
final DomainMapper<String, Long> inGetPersonIdFromAccountIdMapper)
{
personFollowersMapper = inPersonFollowersMapper;
getPersonIdFromAccountIdMapper = inGetPersonIdFromAccountIdMapper;
}
/**
* Returns a list of followers that get this activity. Separate from the composite streams Because its stored in
* cache differently.
*
* @param activity
* the activity.
* @return A list of IDs of following composite streams.
*/
public List<Long> execute(final ActivityDTO activity)
{
// Gets the followers and add to their followed stream
StreamEntityDTO destinationStream = activity.getDestinationStream();
List<Long> followers = null;
if (destinationStream.getType() == EntityType.PERSON)
{
long personId = getPersonIdFromAccountIdMapper.execute(destinationStream.getUniqueIdentifier());
followers = personFollowersMapper.execute(personId);
}
else if (destinationStream.getType() == EntityType.GROUP)
{
// Empty for groups, group activity doesn't show up in following streams.
followers = new ArrayList<Long>();
}
else
{
throw new IllegalArgumentException("This mapper does not support the destination stream type supplied.");
}
return followers;
}
}