/*
* 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.logging.Logger;
import org.b3log.latke.Keys;
import org.b3log.latke.repository.AbstractRepository;
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.solo.model.Link;
import org.b3log.solo.repository.LinkRepository;
import org.json.JSONArray;
import org.json.JSONObject;
/**
* Link repository.
*
* @author <a href="mailto:DL88250@gmail.com">Liang Ding</a>
* @version 1.0.0.5, Nov 10, 2011
* @since 0.3.1
*/
public final class LinkRepositoryImpl extends AbstractRepository implements LinkRepository {
/**
* Logger.
*/
private static final Logger LOGGER = Logger.getLogger(LinkRepositoryImpl.class.getName());
/**
* Singleton.
*/
private static final LinkRepositoryImpl SINGLETON = new LinkRepositoryImpl(Link.LINK);
@Override
public JSONObject getByAddress(final String address) throws RepositoryException {
final Query query = new Query().addFilter(Link.LINK_ADDRESS, FilterOperator.EQUAL, address).
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 int getMaxOrder() throws RepositoryException {
final Query query = new Query();
query.addSort(Link.LINK_ORDER, SortDirection.DESCENDING);
final JSONObject result = get(query);
final JSONArray array = result.optJSONArray(Keys.RESULTS);
if (0 == array.length()) {
return -1;
}
return array.optJSONObject(0).optInt(Link.LINK_ORDER);
}
@Override
public JSONObject getByOrder(final int order) throws RepositoryException {
final Query query = new Query();
query.addFilter(Link.LINK_ORDER, FilterOperator.EQUAL, order);
final JSONObject result = get(query);
final JSONArray array = result.optJSONArray(Keys.RESULTS);
if (0 == array.length()) {
return null;
}
return array.optJSONObject(0);
}
@Override
public JSONObject getUpper(final String id) throws RepositoryException {
final JSONObject link = get(id);
if (null == link) {
return null;
}
final Query query = new Query();
query.addFilter(Link.LINK_ORDER, FilterOperator.LESS_THAN, link.optInt(Link.LINK_ORDER)).
addSort(Link.LINK_ORDER, SortDirection.DESCENDING);
query.setCurrentPageNum(1);
query.setPageSize(1);
final JSONObject result = get(query);
final JSONArray array = result.optJSONArray(Keys.RESULTS);
if (1 != array.length()) {
return null;
}
return array.optJSONObject(0);
}
@Override
public JSONObject getUnder(final String id) throws RepositoryException {
final JSONObject link = get(id);
if (null == link) {
return null;
}
final Query query = new Query();
query.addFilter(Link.LINK_ORDER, FilterOperator.GREATER_THAN, link.optInt(Link.LINK_ORDER)).
addSort(Link.LINK_ORDER, SortDirection.ASCENDING);
query.setCurrentPageNum(1);
query.setPageSize(1);
final JSONObject result = get(query);
final JSONArray array = result.optJSONArray(Keys.RESULTS);
if (1 != array.length()) {
return null;
}
return array.optJSONObject(0);
}
/**
* Gets the {@link LinkRepositoryImpl} singleton.
*
* @return the singleton
*/
public static LinkRepositoryImpl getInstance() {
return SINGLETON;
}
/**
* Private constructor.
*
* @param name the specified name
*/
private LinkRepositoryImpl(final String name) {
super(name);
}
}