/*
* 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.action.execution.stream;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import org.apache.commons.logging.Log;
import org.eurekastreams.commons.actions.ExecutionStrategy;
import org.eurekastreams.commons.actions.context.PrincipalActionContext;
import org.eurekastreams.commons.exceptions.ExecutionException;
import org.eurekastreams.commons.logging.LogFactory;
import org.eurekastreams.server.action.request.stream.StreamPopularHashTagsRequest;
import org.eurekastreams.server.persistence.mappers.DomainMapper;
import org.eurekastreams.server.persistence.mappers.stream.StreamPopularHashTagsReportDTO;
/**
* Execution to get the list of popular HashTags for an activity stream.
*/
public class GetStreamPopularHashTagsExecution implements ExecutionStrategy<PrincipalActionContext>
{
/**
* Mapper to get the popular hashtags for a stream.
*/
private final DomainMapper<StreamPopularHashTagsRequest, StreamPopularHashTagsReportDTO> popularHashTagsMapper;
/**
* Logger.
*/
private Log log = LogFactory.make();
/**
* Constructor.
*
* @param inPopularHashTagsMapper
* the mapper to get the popular hashtags for a stream
*/
public GetStreamPopularHashTagsExecution(
final DomainMapper<StreamPopularHashTagsRequest, StreamPopularHashTagsReportDTO> inPopularHashTagsMapper)
{
popularHashTagsMapper = inPopularHashTagsMapper;
}
/**
* Get the popular hashtags for an activity stream.
*
* @param inActionContext
* the action context
* @return an ArrayList of the popular hashtags
* @throws ExecutionException
* on error
*/
@Override
public Serializable execute(final PrincipalActionContext inActionContext) throws ExecutionException
{
log.debug("Entering");
StreamPopularHashTagsRequest request = (StreamPopularHashTagsRequest) inActionContext.getParams();
StreamPopularHashTagsReportDTO response = popularHashTagsMapper.execute(request);
List<String> hashTags = response.getPopularHashTags();
ArrayList<String> result = new ArrayList<String>();
if (hashTags != null)
{
log.debug("Found " + hashTags.size() + " Popular Hashtags");
result.addAll(hashTags);
}
return result;
}
}