/*
* Copyright (c) 2009, 2010, 2011, 2012, 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.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.b3log.solo.model.Article;
import org.b3log.solo.repository.ArticleRepository;
import org.b3log.latke.Keys;
import org.b3log.latke.repository.*;
import org.b3log.latke.util.CollectionUtils;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
/**
* Article repository.
*
* @author <a href="mailto:DL88250@gmail.com">Liang Ding</a>
* @version 1.0.3.9, May 8, 2012
* @since 0.3.1
*/
public final class ArticleRepositoryImpl extends AbstractRepository implements ArticleRepository {
/**
* Logger.
*/
private static final Logger LOGGER = Logger.getLogger(ArticleRepositoryImpl.class.getName());
/**
* Singleton.
*/
private static final ArticleRepositoryImpl SINGLETON = new ArticleRepositoryImpl(Article.ARTICLE);
/**
* Random range.
*/
private static final double RANDOM_RANGE = 0.1D;
@Override
public JSONObject getByAuthorEmail(final String authorEmail, final int currentPageNum, final int pageSize)
throws RepositoryException {
final Query query = new Query().addFilter(Article.ARTICLE_AUTHOR_EMAIL, FilterOperator.EQUAL, authorEmail).
addFilter(Article.ARTICLE_IS_PUBLISHED, FilterOperator.EQUAL, true).
addSort(Article.ARTICLE_UPDATE_DATE, SortDirection.DESCENDING).
setCurrentPageNum(currentPageNum).setPageSize(pageSize).setPageCount(1);
return get(query);
}
@Override
public JSONObject getByPermalink(final String permalink) throws RepositoryException {
final Query query = new Query().addFilter(Article.ARTICLE_PERMALINK, FilterOperator.EQUAL, permalink).
setPageCount(1);
final JSONObject result = get(query);
final JSONArray array = result.optJSONArray(Keys.RESULTS);
if (0 == array.length()) {
return null;
}
return array.optJSONObject(0);
}
@Override
public List<JSONObject> getRecentArticles(final int fetchSize) throws RepositoryException {
final Query query = new Query();
query.addFilter(Article.ARTICLE_IS_PUBLISHED, FilterOperator.EQUAL, true);
query.addSort(Article.ARTICLE_UPDATE_DATE, SortDirection.DESCENDING);
query.setCurrentPageNum(1);
query.setPageSize(fetchSize);
query.setPageCount(1);
final JSONObject result = get(query);
final JSONArray array = result.optJSONArray(Keys.RESULTS);
return CollectionUtils.jsonArrayToList(array);
}
@Override
public List<JSONObject> getMostCommentArticles(final int num) throws RepositoryException {
final Query query = new Query().addSort(Article.ARTICLE_COMMENT_COUNT, SortDirection.DESCENDING).
addSort(Article.ARTICLE_UPDATE_DATE, SortDirection.DESCENDING).
addFilter(Article.ARTICLE_IS_PUBLISHED, FilterOperator.EQUAL, true).
setCurrentPageNum(1).setPageSize(num).setPageCount(1);
final JSONObject result = get(query);
final JSONArray array = result.optJSONArray(Keys.RESULTS);
return CollectionUtils.jsonArrayToList(array);
}
@Override
public List<JSONObject> getMostViewCountArticles(final int num) throws RepositoryException {
final Query query = new Query();
query.addSort(Article.ARTICLE_VIEW_COUNT, SortDirection.DESCENDING).
addSort(Article.ARTICLE_UPDATE_DATE, SortDirection.DESCENDING);
query.addFilter(Article.ARTICLE_IS_PUBLISHED, FilterOperator.EQUAL, true);
query.setCurrentPageNum(1);
query.setPageSize(num);
query.setPageCount(1);
final JSONObject result = get(query);
final JSONArray array = result.optJSONArray(Keys.RESULTS);
return CollectionUtils.jsonArrayToList(array);
}
@Override
public JSONObject getPreviousArticle(final String articleId) throws RepositoryException {
final JSONObject currentArticle = get(articleId);
final Date currentArticleCreateDate = (Date) currentArticle.opt(Article.ARTICLE_CREATE_DATE);
final Query query = new Query().addFilter(Article.ARTICLE_CREATE_DATE, FilterOperator.LESS_THAN, currentArticleCreateDate).
addFilter(Article.ARTICLE_IS_PUBLISHED, FilterOperator.EQUAL, true).
addSort(Article.ARTICLE_CREATE_DATE, SortDirection.DESCENDING).setCurrentPageNum(1).
setPageSize(1).setPageCount(1).
addProjection(Article.ARTICLE_TITLE, String.class).
addProjection(Article.ARTICLE_PERMALINK, String.class);
final JSONObject result = get(query);
final JSONArray array = result.optJSONArray(Keys.RESULTS);
if (1 != array.length()) {
return null;
}
final JSONObject ret = new JSONObject();
final JSONObject article = array.optJSONObject(0);
try {
ret.put(Article.ARTICLE_TITLE, article.getString(Article.ARTICLE_TITLE));
ret.put(Article.ARTICLE_PERMALINK, article.getString(Article.ARTICLE_PERMALINK));
} catch (final JSONException e) {
throw new RepositoryException(e);
}
return ret;
}
@Override
public JSONObject getNextArticle(final String articleId) throws RepositoryException {
final JSONObject currentArticle = get(articleId);
final Date currentArticleCreateDate = (Date) currentArticle.opt(Article.ARTICLE_CREATE_DATE);
final Query query = new Query().addFilter(Article.ARTICLE_CREATE_DATE, FilterOperator.GREATER_THAN, currentArticleCreateDate).
addFilter(Article.ARTICLE_IS_PUBLISHED, FilterOperator.EQUAL, true).
addSort(Article.ARTICLE_CREATE_DATE, SortDirection.ASCENDING).setCurrentPageNum(1).
setPageSize(1).setPageCount(1).
addProjection(Article.ARTICLE_TITLE, String.class).
addProjection(Article.ARTICLE_PERMALINK, String.class);
final JSONObject result = get(query);
final JSONArray array = result.optJSONArray(Keys.RESULTS);
if (1 != array.length()) {
return null;
}
final JSONObject ret = new JSONObject();
final JSONObject article = array.optJSONObject(0);
try {
ret.put(Article.ARTICLE_TITLE, article.getString(Article.ARTICLE_TITLE));
ret.put(Article.ARTICLE_PERMALINK, article.getString(Article.ARTICLE_PERMALINK));
} catch (final JSONException e) {
throw new RepositoryException(e);
}
return ret;
}
@Override
public boolean isPublished(final String articleId) throws RepositoryException {
final JSONObject article = get(articleId);
if (null == article) {
return false;
}
return article.optBoolean(Article.ARTICLE_IS_PUBLISHED);
}
@Override
public List<JSONObject> getRandomly(final int fetchSize) throws RepositoryException {
final List<JSONObject> ret = new ArrayList<JSONObject>();
if (0 == count()) {
return ret;
}
final double mid = Math.random() + RANDOM_RANGE;
LOGGER.log(Level.FINEST, "Random mid[{0}]", mid);
Query query = new Query();
query.addFilter(Article.ARTICLE_RANDOM_DOUBLE, FilterOperator.GREATER_THAN_OR_EQUAL, mid);
query.addFilter(Article.ARTICLE_RANDOM_DOUBLE, FilterOperator.LESS_THAN_OR_EQUAL, mid);
query.addFilter(Article.ARTICLE_IS_PUBLISHED, FilterOperator.EQUAL, true);
query.setCurrentPageNum(1);
query.setPageSize(fetchSize);
query.setPageCount(1);
final JSONObject result1 = get(query);
final JSONArray array1 = result1.optJSONArray(Keys.RESULTS);
final List<JSONObject> list1 = CollectionUtils.<JSONObject>jsonArrayToList(array1);
ret.addAll(list1);
final int reminingSize = fetchSize - array1.length();
if (0 != reminingSize) { // Query for remains
query = new Query();
query.addFilter(Article.ARTICLE_RANDOM_DOUBLE, FilterOperator.GREATER_THAN_OR_EQUAL, 0D);
query.addFilter(Article.ARTICLE_RANDOM_DOUBLE, FilterOperator.LESS_THAN_OR_EQUAL, mid);
query.addFilter(Article.ARTICLE_IS_PUBLISHED, FilterOperator.EQUAL, true);
query.setCurrentPageNum(1);
query.setPageSize(reminingSize);
query.setPageCount(1);
final JSONObject result2 = get(query);
final JSONArray array2 = result2.optJSONArray(Keys.RESULTS);
final List<JSONObject> list2 = CollectionUtils.<JSONObject>jsonArrayToList(array2);
ret.addAll(list2);
}
return ret;
}
/**
* Gets the {@link ArticleRepositoryImpl} singleton.
*
* @return the singleton
*/
public static ArticleRepositoryImpl getInstance() {
return SINGLETON;
}
/**
* Private constructor.
*
* @param name the specified name
*/
private ArticleRepositoryImpl(final String name) {
super(name);
}
}