/*
* 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 java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import org.apache.commons.logging.Log;
import org.eurekastreams.commons.logging.LogFactory;
import org.eurekastreams.server.domain.stream.HashTag;
import org.eurekastreams.server.persistence.mappers.BaseDomainMapper;
import org.eurekastreams.server.persistence.mappers.chained.RefreshStrategy;
/**
* Refresh strategy to insert HashTags in the database, lowercasing and making sure they start with octothorpe.
*/
public class HashTagDbRefreshStrategy extends BaseDomainMapper implements RefreshStrategy<List<String>, List<HashTag>>
{
/**
* Logger.
*/
private final Log log = LogFactory.make();
/**
* Refresh the cache with the input content and hash tag.
*
* @param inContents
* the contents of the hashtags
* @param inHashTags
* HashTags retrieved from another data source
*/
@Override
public void refresh(final List<String> inContents, final List<HashTag> inHashTags)
{
// scrub the inputs
List<String> contents = new ArrayList<String>();
for (String content : inContents)
{
if (!content.startsWith("#"))
{
content = "#" + content.toLowerCase();
}
else
{
content = content.toLowerCase();
}
contents.add(content);
}
// get all of the existing hashtag contents
List<HashTag> foundHashTags = getEntityManager().createQuery("FROM HashTag WHERE content IN (:contents)")
.setParameter("contents", contents).getResultList();
inHashTags.clear();
inHashTags.addAll(foundHashTags);
for (String content : inContents)
{
if (isHashTagInCollection(content, foundHashTags))
{
if (log.isTraceEnabled())
{
log.trace("HashTag " + content + " already exists - skipping.");
}
continue;
}
if (log.isTraceEnabled())
{
log.trace("Inserting hashtag " + content + " in the database.");
}
// INSERT the hastag
HashTag ht = new HashTag(content);
getEntityManager().persist(ht);
inHashTags.add(ht);
}
}
/**
* Check whether the hashtag content is in the list of hash tags.
*
* @param inContent
* the content to search for
* @param hashTags
* the hashtags to search
* @return whether the content was found in the list of hashtags
*/
private boolean isHashTagInCollection(final String inContent, final Collection<HashTag> hashTags)
{
for (HashTag hashTag : hashTags)
{
if (hashTag.getContent().equals(inContent))
{
return true;
}
}
return false;
}
}