/*
* Copyright (c) 2009, 2010, 2011, 2012, 2013, 2014, B3log Team
*
* 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.b3log.solo.service;
import java.util.List;
import javax.inject.Inject;
import org.b3log.latke.Keys;
import org.b3log.latke.logging.Level;
import org.b3log.latke.logging.Logger;
import org.b3log.latke.repository.RepositoryException;
import org.b3log.latke.repository.Transaction;
import org.b3log.latke.service.ServiceException;
import org.b3log.latke.service.annotation.Service;
import org.b3log.solo.model.Tag;
import org.b3log.solo.repository.TagRepository;
import org.json.JSONException;
import org.json.JSONObject;
/**
* Tag management service.
*
* @author <a href="http://88250.b3log.org">Liang Ding</a>
* @version 1.0.0.1, Oct 26, 2011
* @since 0.4.0
*/
@Service
public class TagMgmtService {
/**
* Logger.
*/
private static final Logger LOGGER = Logger.getLogger(TagMgmtService.class.getName());
/**
* Tag query service.
*/
@Inject
private TagQueryService tagQueryService;
/**
* Tag repository.
*/
@Inject
private TagRepository tagRepository;
/**
* Decrements reference count of every tag of an published article specified
* by the given article id.
*
* @param articleId the given article id
* @throws JSONException json exception
* @throws RepositoryException repository exception
*/
public void decTagPublishedRefCount(final String articleId) throws JSONException, RepositoryException {
final List<JSONObject> tags = tagRepository.getByArticleId(articleId);
for (final JSONObject tag : tags) {
final String tagId = tag.getString(Keys.OBJECT_ID);
final int refCnt = tag.getInt(Tag.TAG_REFERENCE_COUNT);
tag.put(Tag.TAG_REFERENCE_COUNT, refCnt);
final int publishedRefCnt = tag.getInt(Tag.TAG_PUBLISHED_REFERENCE_COUNT);
tag.put(Tag.TAG_PUBLISHED_REFERENCE_COUNT, publishedRefCnt - 1);
tagRepository.update(tagId, tag);
}
}
/**
* Removes all unused tags.
*
* @throws ServiceException if get tags failed, or remove failed
*/
public void removeUnusedTags() throws ServiceException {
final Transaction transaction = tagRepository.beginTransaction();
try {
final List<JSONObject> tags = tagQueryService.getTags();
for (int i = 0; i < tags.size(); i++) {
final JSONObject tag = tags.get(i);
final int tagRefCnt = tag.getInt(Tag.TAG_REFERENCE_COUNT);
if (0 == tagRefCnt) {
final String tagId = tag.getString(Keys.OBJECT_ID);
tagRepository.remove(tagId);
}
}
transaction.commit();
} catch (final Exception e) {
if (transaction.isActive()) {
transaction.rollback();
}
LOGGER.log(Level.ERROR, "Removes unused tags failed", e);
throw new ServiceException(e);
}
}
/**
* Sets the tag repository with the specified tag repository.
*
* @param tagRepository the specified tag repository
*/
public void setTagRepository(final TagRepository tagRepository) {
this.tagRepository = tagRepository;
}
/**
* Sets the tag query service with the specified tag query service.
*
* @param tagQueryService the specified tag query service
*/
public void setTagQueryService(final TagQueryService tagQueryService) {
this.tagQueryService = tagQueryService;
}
}