/*
* 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.jsonrpc.impl;
import java.io.IOException;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.b3log.latke.Keys;
import org.b3log.latke.action.ActionException;
import org.b3log.latke.action.util.PageCaches;
import org.b3log.latke.action.util.Paginator;
import org.b3log.latke.model.Pagination;
import org.b3log.latke.repository.Query;
import org.b3log.latke.repository.SortDirection;
import org.b3log.latke.repository.Transaction;
import org.b3log.solo.action.StatusCodes;
import org.b3log.solo.jsonrpc.AbstractGAEJSONRpcService;
import org.b3log.solo.model.Link;
import org.b3log.solo.repository.LinkRepository;
import org.b3log.solo.repository.impl.LinkGAERepository;
import org.b3log.solo.util.Users;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
/**
* Link service for JavaScript client.
*
* @author <a href="mailto:DL88250@gmail.com">Liang Ding</a>
* @version 1.0.0.9, Jan 20, 2011
*/
public final class LinkService extends AbstractGAEJSONRpcService {
/**
* Logger.
*/
private static final Logger LOGGER =
Logger.getLogger(LinkService.class.getName());
/**
* Link repository.
*/
private LinkRepository linkRepository = LinkGAERepository.getInstance();
/**
* User utilities.
*/
private Users userUtils = Users.getInstance();
/**
* Gets a link by the specified request json object.
*
* @param requestJSONObject the specified request json object, for example,
* <pre>
* {
* "oId": ""
* }
* </pre>
* @return for example,
* <pre>
* {
* "link": {
* "oId": "",
* "linkTitle": "",
* "linkAddress": ""
* },
* "sc": "GET_LINK_SUCC"
* }
* </pre>
* @throws ActionException action exception
*/
public JSONObject getLink(final JSONObject requestJSONObject)
throws ActionException {
final JSONObject ret = new JSONObject();
try {
final String linkId = requestJSONObject.getString(Keys.OBJECT_ID);
final JSONObject link = linkRepository.get(linkId);
ret.put(Link.LINK, link);
ret.put(Keys.STATUS_CODE, StatusCodes.GET_LINK_SUCC);
LOGGER.log(Level.FINER, "Got a link[oId={0}]", linkId);
} catch (final Exception e) {
LOGGER.log(Level.SEVERE, e.getMessage(), e);
throw new ActionException(e);
}
return ret;
}
/**
* Gets links by the specified request json object.
*
* @param requestJSONObject the specified request json object, for example,
* <pre>
* {
* "paginationCurrentPageNum": 1,
* "paginationPageSize": 20,
* "paginationWindowSize": 10
* }, see {@link Pagination} for more details
* </pre>
* @return for example,
* <pre>
* {
* "pagination": {
* "paginationPageCount": 100,
* "paginationPageNums": [1, 2, 3, 4, 5]
* },
* "links": [{
* "oId": "",
* "linkTitle": "",
* "linkAddress": "",
* }, ....]
* "sc": "GET_LINKS_SUCC"
* }
* </pre>
* @throws ActionException action exception
* @see Pagination
*/
public JSONObject getLinks(final JSONObject requestJSONObject)
throws ActionException {
final JSONObject ret = new JSONObject();
try {
final int currentPageNum = requestJSONObject.getInt(
Pagination.PAGINATION_CURRENT_PAGE_NUM);
final int pageSize = requestJSONObject.getInt(
Pagination.PAGINATION_PAGE_SIZE);
final int windowSize = requestJSONObject.getInt(
Pagination.PAGINATION_WINDOW_SIZE);
final Query query = new Query().setCurrentPageNum(currentPageNum).
setPageSize(pageSize).
addSort(Link.LINK_ORDER, SortDirection.ASCENDING);
final JSONObject result = linkRepository.get(query);
final int pageCount = result.getJSONObject(Pagination.PAGINATION).
getInt(Pagination.PAGINATION_PAGE_COUNT);
final JSONObject pagination = new JSONObject();
final List<Integer> pageNums =
Paginator.paginate(currentPageNum, pageSize, pageCount,
windowSize);
pagination.put(Pagination.PAGINATION_PAGE_COUNT, pageCount);
pagination.put(Pagination.PAGINATION_PAGE_NUMS, pageNums);
final JSONArray links = result.getJSONArray(Keys.RESULTS);
ret.put(Pagination.PAGINATION, pagination);
ret.put(Link.LINKS, links);
ret.put(Keys.STATUS_CODE, StatusCodes.GET_LINKS_SUCC);
} catch (final Exception e) {
LOGGER.log(Level.SEVERE, e.getMessage(), e);
throw new ActionException(e);
}
return ret;
}
/**
* Changes link order by the specified link id and order.
*
* @param linkId the specified link id
* @param linkOrder the specified order
* @param request the specified http servlet request
* @param response the specified http servlet response
* @return {@code true} if changed, {@code false} otherwise
* @throws ActionException action exception
* @throws IOException io exception
*/
public boolean changeOrder(final String linkId, final int linkOrder,
final HttpServletRequest request,
final HttpServletResponse response)
throws ActionException, IOException {
final JSONObject ret = new JSONObject();
if (!userUtils.isAdminLoggedIn()) {
response.sendError(HttpServletResponse.SC_FORBIDDEN);
return false;
}
final Transaction transaction = linkRepository.beginTransaction();
try {
final JSONObject link1 = linkRepository.get(linkId);
final String link1Id = linkId;
final JSONObject link2 = linkRepository.getByOrder(linkOrder);
final String link2Id = link2.getString(Keys.OBJECT_ID);
final int oldLink1Order = link1.getInt(Link.LINK_ORDER);
final JSONObject newLink2 =
new JSONObject(link2, JSONObject.getNames(link2));
newLink2.put(Link.LINK_ORDER, oldLink1Order);
final JSONObject newLink1 =
new JSONObject(link1, JSONObject.getNames(link1));
newLink1.put(Link.LINK_ORDER, linkOrder);
linkRepository.update(link2Id, newLink2);
linkRepository.update(link1Id, newLink1);
transaction.commit();
PageCaches.removeAll();
return true;
} catch (final Exception e) {
if (transaction.isActive()) {
transaction.rollback();
}
LOGGER.log(Level.SEVERE, e.getMessage(), e);
return false;
}
}
/**
* Updates a link by the specified request json object.
*
* @param requestJSONObject the specified request json object, for example,
* <pre>
* {
* "link": {
* "oId": "",
* "linkTitle": "",
* "linkAddress": ""
* }
* }, see {@link Link} for more details
* </pre>
* @param request the specified http servlet request
* @param response the specified http servlet response
* @return for example,
* <pre>
* {
* "sc": "UPDATE_LINK_SUCC"
* }
* </pre>
* @throws ActionException action exception
* @throws IOException io exception
*/
public JSONObject updateLink(final JSONObject requestJSONObject,
final HttpServletRequest request,
final HttpServletResponse response)
throws ActionException, IOException {
final JSONObject ret = new JSONObject();
if (!userUtils.isAdminLoggedIn()) {
response.sendError(HttpServletResponse.SC_FORBIDDEN);
return ret;
}
final Transaction transaction = linkRepository.beginTransaction();
try {
final JSONObject link =
requestJSONObject.getJSONObject(Link.LINK);
final String linkId = link.getString(Keys.OBJECT_ID);
final JSONObject oldLink = linkRepository.get(linkId);
link.put(Link.LINK_ORDER, oldLink.getInt(Link.LINK_ORDER));
linkRepository.update(linkId, link);
PageCaches.removeAll();
transaction.commit();
ret.put(Keys.STATUS_CODE, StatusCodes.UPDATE_LINK_SUCC);
LOGGER.log(Level.FINER, "Updated a link[oId={0}]",
linkId);
} catch (final Exception e) {
if (transaction.isActive()) {
transaction.rollback();
}
LOGGER.log(Level.SEVERE, e.getMessage(), e);
try {
ret.put(Keys.STATUS_CODE, StatusCodes.UPDATE_LINK_FAIL_);
} catch (final JSONException ex) {
LOGGER.log(Level.SEVERE, ex.getMessage(), ex);
throw new ActionException(ex);
}
}
return ret;
}
/**
* Removes a link by the specified request json object.
*
* @param requestJSONObject the specified request json object, for example,
* <pre>
* {
* "oId": "",
* }
* </pre>
* @param request the specified http servlet request
* @param response the specified http servlet response
* @return for example,
* <pre>
* {
* "sc": "REMOVE_LINK_SUCC"
* }
* </pre>
* @throws ActionException action exception
* @throws IOException io exception
*/
public JSONObject removeLink(final JSONObject requestJSONObject,
final HttpServletRequest request,
final HttpServletResponse response)
throws ActionException, IOException {
final JSONObject ret = new JSONObject();
if (!userUtils.isAdminLoggedIn()) {
response.sendError(HttpServletResponse.SC_FORBIDDEN);
return ret;
}
final Transaction transaction = linkRepository.beginTransaction();
try {
final String linkId = requestJSONObject.getString(Keys.OBJECT_ID);
LOGGER.log(Level.FINER, "Removing a link[oId={0}]", linkId);
linkRepository.remove(linkId);
PageCaches.removeAll();
transaction.commit();
ret.put(Keys.STATUS_CODE, StatusCodes.REMOVE_LINK_SUCC);
LOGGER.log(Level.FINER, "Removed a link[oId={0}]", linkId);
} catch (final Exception e) {
if (transaction.isActive()) {
transaction.rollback();
}
LOGGER.log(Level.SEVERE, e.getMessage(), e);
try {
ret.put(Keys.STATUS_CODE, StatusCodes.REMOVE_LINK_FAIL_);
} catch (final JSONException ex) {
LOGGER.log(Level.SEVERE, ex.getMessage(), ex);
throw new ActionException(ex);
}
}
return ret;
}
/**
* Adds a link with the specified request json object.
*
* @param requestJSONObject the specified request json object, for example,
* <pre>
* {
* "link": {
* "linkTitle": "",
* "linkAddress": ""
* }
* }, see {@link Link} for more details
* </pre>
* @param request the specified http servlet request
* @param response the specified http servlet response
* @return for example,
* <pre>
* {
* "oId": generatedLinkId,
* "sc": ADD_LINK_SUCC
* }
* </pre>
* @throws ActionException action exception
* @throws IOException io exception
*/
public JSONObject addLink(final JSONObject requestJSONObject,
final HttpServletRequest request,
final HttpServletResponse response)
throws ActionException, IOException {
final JSONObject ret = new JSONObject();
if (!userUtils.isAdminLoggedIn()) {
response.sendError(HttpServletResponse.SC_FORBIDDEN);
return ret;
}
final Transaction transaction = linkRepository.beginTransaction();
try {
final JSONObject link =
requestJSONObject.getJSONObject(Link.LINK);
final int maxOrder = linkRepository.getMaxOrder();
link.put(Link.LINK_ORDER, maxOrder + 1);
final String linkId = linkRepository.add(link);
transaction.commit();
ret.put(Keys.OBJECT_ID, linkId);
ret.put(Keys.STATUS_CODE, StatusCodes.ADD_LINK_SUCC);
} catch (final Exception e) {
if (transaction.isActive()) {
transaction.rollback();
}
LOGGER.log(Level.SEVERE, e.getMessage(), e);
throw new ActionException(e);
}
PageCaches.removeAll();
return ret;
}
/**
* Gets the {@link LinkService} singleton.
*
* @return the singleton
*/
public static LinkService getInstance() {
return SingletonHolder.SINGLETON;
}
/**
* Private default constructor.
*/
private LinkService() {
}
/**
* 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 LinkService SINGLETON = new LinkService();
/**
* Private default constructor.
*/
private SingletonHolder() {
}
}
}