/*
* Copyright (c) 2009, 2010, 2011, 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.repository.impl;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.b3log.solo.model.Article;
import org.b3log.solo.model.Comment;
import org.b3log.solo.repository.ArticleCommentRepository;
import org.b3log.latke.Keys;
import org.b3log.latke.repository.FilterOperator;
import org.b3log.latke.repository.Query;
import org.b3log.latke.repository.RepositoryException;
import org.b3log.latke.repository.SortDirection;
import org.b3log.latke.repository.gae.AbstractGAERepository;
import org.b3log.latke.util.CollectionUtils;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
/**
* Article-Comment relation Google App Engine repository.
*
* @author <a href="mailto:DL88250@gmail.com">Liang Ding</a>
* @version 1.0.0.5, Jan 12, 2011
*/
public final class ArticleCommentGAERepository extends AbstractGAERepository
implements ArticleCommentRepository {
/**
* Logger.
*/
private static final Logger LOGGER =
Logger.getLogger(ArticleCommentGAERepository.class.getName());
@Override
public String getName() {
return Article.ARTICLE + "_" + Comment.COMMENT;
}
@Override
public List<JSONObject> getByArticleId(final String articleId)
throws RepositoryException {
final Query query = new Query();
query.addFilter(Article.ARTICLE + "_" + Keys.OBJECT_ID,
FilterOperator.EQUAL, articleId);
query.addSort(Keys.OBJECT_ID, SortDirection.DESCENDING);
final JSONObject result = get(query);
try {
final JSONArray articleComments = result.getJSONArray(Keys.RESULTS);
return CollectionUtils.jsonArrayToList(articleComments);
} catch (final JSONException e) {
LOGGER.log(Level.SEVERE, e.getMessage(), e);
throw new RepositoryException(e);
}
}
@Override
public JSONObject getByCommentId(final String commentId)
throws RepositoryException {
final Query query = new Query();
query.addFilter(Comment.COMMENT + "_" + Keys.OBJECT_ID,
FilterOperator.EQUAL, commentId);
final JSONObject result = get(query);
final JSONArray array = result.optJSONArray(Keys.RESULTS);
if (0 == array.length()) {
return null;
}
return array.optJSONObject(0);
}
/**
* Gets the {@link ArticleCommentGAERepository} singleton.
*
* @return the singleton
*/
public static ArticleCommentGAERepository getInstance() {
return SingletonHolder.SINGLETON;
}
/**
* Private default constructor.
*/
private ArticleCommentGAERepository() {
}
/**
* Singleton holder.
*
* @author <a href="mailto:DL88250@gmail.com">Liang Ding</a>
* @version 1.0.0.0, Jan 12, 2011
*/
private static final class SingletonHolder {
/**
* Singleton.
*/
private static final ArticleCommentGAERepository SINGLETON =
new ArticleCommentGAERepository();
/**
* Private default constructor.
*/
private SingletonHolder() {
}
}
}