/*
* 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.ArrayList;
import java.util.Collections;
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.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.b3log.solo.model.BlogSync;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
/**
* Article Google App Engine repository.
*
* @author <a href="mailto:DL88250@gmail.com">Liang Ding</a>
* @version 1.0.3.1, Jul 10, 2011
*/
public final class ArticleGAERepository extends AbstractGAERepository
implements ArticleRepository {
/**
* Logger.
*/
private static final Logger LOGGER =
Logger.getLogger(ArticleGAERepository.class.getName());
@Override
public String getName() {
return Article.ARTICLE;
}
@Override
public JSONObject getByAuthorEmail(final String authorEmail,
final int currentPageNum,
final int pageSize)
throws RepositoryException {
final Query query = new Query();
query.addFilter(Article.ARTICLE_AUTHOR_EMAIL,
FilterOperator.EQUAL, authorEmail);
query.addSort(Article.ARTICLE_UPDATE_DATE,
SortDirection.DESCENDING);
query.setCurrentPageNum(currentPageNum);
query.setPageSize(pageSize);
return get(query);
}
@Override
public JSONObject getByPermalink(final String permalink) {
final Query query = new Query();
query.addFilter(Article.ARTICLE_PERMALINK,
FilterOperator.EQUAL, permalink);
try {
final JSONObject result = get(query);
final JSONArray array = result.getJSONArray(Keys.RESULTS);
if (0 == array.length()) {
return null;
}
return array.getJSONObject(0);
} catch (final Exception e) {
LOGGER.log(Level.SEVERE, e.getMessage(), e);
}
return null;
}
@Override
public List<JSONObject> getRecentArticles(final int fetchSize) {
final Query query = new Query();
query.addSort(Article.ARTICLE_UPDATE_DATE,
SortDirection.DESCENDING);
query.setCurrentPageNum(1);
query.setPageSize(fetchSize);
try {
final JSONObject result = get(query);
final JSONArray array = result.getJSONArray(Keys.RESULTS);
return CollectionUtils.jsonArrayToList(array);
} catch (final Exception e) {
LOGGER.log(Level.SEVERE, e.getMessage(), e);
}
return Collections.emptyList();
}
@Override
public List<JSONObject> getMostCommentArticles(final int num) {
final Query query = new Query();
query.addSort(Article.ARTICLE_COMMENT_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);
try {
final JSONObject result = get(query);
final JSONArray array = result.getJSONArray(Keys.RESULTS);
return CollectionUtils.jsonArrayToList(array);
} catch (final Exception e) {
LOGGER.log(Level.SEVERE, e.getMessage(), e);
}
return Collections.emptyList();
}
@Override
public List<JSONObject> getMostViewCountArticles(final int num) {
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);
try {
final JSONObject result = get(query);
final JSONArray array = result.getJSONArray(Keys.RESULTS);
return CollectionUtils.jsonArrayToList(array);
} catch (final Exception e) {
LOGGER.log(Level.SEVERE, e.getMessage(), e);
}
return Collections.emptyList();
}
@Override
public JSONObject getPreviousArticle(final String articleId)
throws RepositoryException {
try {
final JSONObject current = get(articleId);
final Date currentDate = (Date) current.get(
Article.ARTICLE_CREATE_DATE);
final Query query = new Query();
query.addFilter(Article.ARTICLE_CREATE_DATE,
FilterOperator.LESS_THAN, currentDate);
query.addFilter(Article.ARTICLE_IS_PUBLISHED,
FilterOperator.EQUAL, true);
query.addSort(Article.ARTICLE_CREATE_DATE,
SortDirection.DESCENDING);
query.setCurrentPageNum(1);
query.setPageSize(1);
final JSONObject result = get(query);
final JSONArray array = result.getJSONArray(Keys.RESULTS);
if (1 != array.length()) {
return null;
}
final JSONObject ret = new JSONObject();
final JSONObject article = array.getJSONObject(0);
ret.put(Article.ARTICLE_TITLE,
article.getString(Article.ARTICLE_TITLE));
ret.put(Article.ARTICLE_PERMALINK,
article.getString(Article.ARTICLE_PERMALINK));
return ret;
} catch (final Exception e) {
LOGGER.log(Level.SEVERE, e.getMessage(), e);
throw new RepositoryException(e);
}
}
@Override
public JSONObject getNextArticle(final String articleId)
throws RepositoryException {
try {
final JSONObject current = get(articleId);
final Date currentDate = (Date) current.get(
Article.ARTICLE_CREATE_DATE);
final Query query = new Query();
query.addFilter(Article.ARTICLE_CREATE_DATE,
FilterOperator.GREATER_THAN, currentDate);
query.addFilter(Article.ARTICLE_IS_PUBLISHED,
FilterOperator.EQUAL, true);
query.addSort(Article.ARTICLE_CREATE_DATE,
SortDirection.ASCENDING);
query.setCurrentPageNum(1);
query.setPageSize(1);
final JSONObject result = get(query);
final JSONArray array = result.getJSONArray(Keys.RESULTS);
if (1 != array.length()) {
return null;
}
final JSONObject ret = new JSONObject();
final JSONObject article = array.getJSONObject(0);
ret.put(Article.ARTICLE_TITLE,
article.getString(Article.ARTICLE_TITLE));
ret.put(Article.ARTICLE_PERMALINK,
article.getString(Article.ARTICLE_PERMALINK));
return ret;
} catch (final Exception e) {
LOGGER.log(Level.SEVERE, e.getMessage(), e);
throw new RepositoryException(e);
}
}
@Override
public void importArticle(final JSONObject article)
throws RepositoryException {
String articleId = null;
try {
if (!article.has(Keys.OBJECT_ID)) {
throw new RepositoryException("The article to import MUST exist "
+ "id");
}
articleId = article.getString(Keys.OBJECT_ID);
if (!article.has(Article.ARTICLE_CREATE_DATE)) {
throw new RepositoryException("The article to import MUST exist "
+ "create date");
}
// XXX: check other params
// Remove external attributes, such as "blogSyncExternal...."
article.remove(BlogSync.BLOG_SYNC_EXTERNAL_ARTICLE_ABSTRACT);
article.remove(BlogSync.BLOG_SYNC_EXTERNAL_ARTICLE_CATEGORIES);
article.remove(BlogSync.BLOG_SYNC_EXTERNAL_ARTICLE_CONTENT);
article.remove(BlogSync.BLOG_SYNC_EXTERNAL_ARTICLE_CREATE_DATE);
article.remove(BlogSync.BLOG_SYNC_EXTERNAL_ARTICLE_ID);
article.remove(BlogSync.BLOG_SYNC_EXTERNAL_ARTICLE_TITLE);
super.add(article);
} catch (final Exception e) {
LOGGER.log(Level.SEVERE, e.getMessage(), e);
throw new RepositoryException(e);
}
LOGGER.log(Level.FINER, "Imported an article[oId={0}]", articleId);
}
@Override
public boolean isPublished(final String articleId)
throws RepositoryException {
final JSONObject article = get(articleId);
if (null == article) {
return false;
} else {
try {
return article.getBoolean(Article.ARTICLE_IS_PUBLISHED);
} catch (final JSONException e) {
LOGGER.log(Level.SEVERE, e.getMessage(), e);
throw new RepositoryException(e);
}
}
}
@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();
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, 1D);
query.addFilter(Article.ARTICLE_IS_PUBLISHED,
FilterOperator.EQUAL, true);
query.setCurrentPageNum(1);
query.setPageSize(fetchSize);
final JSONObject result1 = get(query);
final JSONArray array1 = result1.optJSONArray(Keys.RESULTS);
try {
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);
final JSONObject result2 = get(query);
final JSONArray array2 = result2.optJSONArray(Keys.RESULTS);
final List<JSONObject> list2 =
CollectionUtils.<JSONObject>jsonArrayToList(array2);
ret.addAll(list2);
}
} catch (final JSONException e) {
LOGGER.log(Level.SEVERE, e.getMessage(), e);
}
return ret;
}
/**
* Gets the {@link ArticleGAERepository} singleton.
*
* @return the singleton
*/
public static ArticleGAERepository getInstance() {
return SingletonHolder.SINGLETON;
}
/**
* Private default constructor.
*/
private ArticleGAERepository() {
}
/**
* 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 ArticleGAERepository SINGLETON =
new ArticleGAERepository();
/**
* Private default constructor.
*/
private SingletonHolder() {
}
}
}