/*
* 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.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.b3log.latke.Keys;
import org.b3log.latke.Latkes;
import org.b3log.latke.RuntimeEnv;
import org.b3log.latke.cache.Cache;
import org.b3log.latke.cache.CacheFactory;
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.solo.model.Page;
import org.b3log.solo.repository.PageRepository;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
/**
* Page Google App Engine repository.
*
* @author <a href="mailto:DL88250@gmail.com">Liang Ding</a>
* @version 1.0.0.4, Jan 20, 2011
*/
public final class PageGAERepository extends AbstractGAERepository
implements PageRepository {
/**
* Logger.
*/
private static final Logger LOGGER =
Logger.getLogger(PageGAERepository.class.getName());
/**
* Cache.
*/
private static final Cache<String, Object> CACHE;
static {
final RuntimeEnv runtimeEnv = Latkes.getRuntimeEnv();
if (!runtimeEnv.equals(RuntimeEnv.GAE)) {
throw new IllegalStateException(
"GAE repository can only runs on Google App Engine, please "
+ "check your configuration and make sure "
+ "Latkes.setRuntimeEnv(RuntimeEnv.GAE) was invoked before "
+ "using GAE repository.");
}
CACHE = CacheFactory.getCache("PageGAERepositoryCache");
}
@Override
public String getName() {
return Page.PAGE;
}
@Override
public JSONObject getByPermalink(final String permalink) {
final Query query = new Query();
query.addFilter(Page.PAGE_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 int getMaxOrder() throws RepositoryException {
final Query query = new Query();
query.addSort(Page.PAGE_ORDER, SortDirection.DESCENDING);
final JSONObject result = get(query);
final JSONArray array = result.optJSONArray(Keys.RESULTS);
if (0 == array.length()) {
return -1;
}
try {
return array.getJSONObject(0).getInt(Page.PAGE_ORDER);
} catch (final JSONException e) {
LOGGER.log(Level.SEVERE, e.getMessage(), e);
throw new RepositoryException(e);
}
}
@Override
public JSONObject getByOrder(final int order) {
final Query query = new Query();
query.addFilter(Page.PAGE_ORDER, FilterOperator.EQUAL, order);
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> getPages() throws RepositoryException {
final String cacheKey = "[pages]";
@SuppressWarnings("unchecked")
List<JSONObject> ret = (List<JSONObject>) CACHE.get(cacheKey);
if (null != ret) {
LOGGER.log(Level.FINEST, "Got the pages from cache");
} else {
ret = new ArrayList<JSONObject>();
final org.b3log.latke.repository.Query query =
new org.b3log.latke.repository.Query().addSort(
Page.PAGE_ORDER, SortDirection.ASCENDING);
final JSONObject result = get(query);
try {
ret =
org.b3log.latke.util.CollectionUtils.jsonArrayToList(result.
getJSONArray(Keys.RESULTS));
} catch (final JSONException e) {
LOGGER.log(Level.SEVERE, e.getMessage(), e);
throw new RepositoryException(e);
}
CACHE.put(cacheKey, ret);
LOGGER.log(Level.FINEST,
"Got the pages, then put it into cache");
}
return ret;
}
/**
* Gets the {@link PageGAERepository} singleton.
*
* @return the singleton
*/
public static PageGAERepository getInstance() {
return SingletonHolder.SINGLETON;
}
/**
* Private default constructor.
*/
private PageGAERepository() {
}
/**
* 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 PageGAERepository SINGLETON =
new PageGAERepository();
/**
* Private default constructor.
*/
private SingletonHolder() {
}
}
}