/*
* 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.File;
import org.b3log.solo.repository.FileRepository;
import org.b3log.solo.repository.impl.FileGAERepository;
import org.b3log.solo.util.Users;
import org.json.JSONArray;
import org.json.JSONObject;
/**
* File service for JavaScript client.
*
* @author <a href="mailto:DL88250@gmail.com">Liang Ding</a>
* @version 1.0.0.5, Jan 20, 2011
*/
public final class FileService extends AbstractGAEJSONRpcService {
/**
* Logger.
*/
private static final Logger LOGGER =
Logger.getLogger(FileService.class.getName());
/**
* File repository.
*/
private FileRepository fileRepository = FileGAERepository.getInstance();
/**
* User utilities.
*/
private Users userUtils = Users.getInstance();
/**
* Gets the file with the specified request json object, http servlet
* request and response.
*
* @param requestJSONObject the specified request json object, for example,
* <pre>
* {
* "paginationCurrentPageNum": 1,
* "paginationPageSize": 20,
* "paginationWindowSize": 10
* }
* </pre>
* @param request the specified http servlet request
* @param response the specified http servlet response
* @return for example,
* <pre>
* {
* "pagination": {
* "paginationPageCount": int,
* "paginationPageNums": [1, 2, 3, 4, 5, int]
* },
* "files": [{
* "fileName": "",
* "fileSize": long,
* "fileDownloadCount": int,
* "fileUploadDate": java.util.Date
* }, ....]
* }
* </pre>
* @throws ActionException action exception
* @throws IOException io exception
*/
public JSONObject getFiles(final JSONObject requestJSONObject,
final HttpServletRequest request,
final HttpServletResponse response)
throws ActionException, IOException {
final JSONObject ret = new JSONObject();
if (!userUtils.isLoggedIn()) {
response.sendError(HttpServletResponse.SC_FORBIDDEN);
return ret;
}
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(File.FILE_UPLOAD_DATE, SortDirection.DESCENDING);
final JSONObject result = fileRepository.get(query);
final int pageCount = result.getJSONObject(Pagination.PAGINATION).
getInt(Pagination.PAGINATION_PAGE_COUNT);
final JSONObject pagination = new JSONObject();
ret.put(Pagination.PAGINATION, pagination);
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 files = result.getJSONArray(Keys.RESULTS);
for (int i = 0; i < files.length(); i++) { // Remove unused properties
final JSONObject file = files.getJSONObject(i);
file.remove(File.FILE_CONTENT_TYPE);
file.remove(File.FILE_CONTENT);
}
ret.put(File.FILES, files);
ret.put(Keys.STATUS_CODE, StatusCodes.GET_FILES_SUCC);
} catch (final Exception e) {
LOGGER.log(Level.SEVERE, e.getMessage(), e);
throw new ActionException(e);
}
return ret;
}
/**
* Removes a file 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_FILE_SUCC"
* }
* </pre>
* @throws ActionException action exception
* @throws IOException io exception
*/
public JSONObject removeFile(final JSONObject requestJSONObject,
final HttpServletRequest request,
final HttpServletResponse response)
throws ActionException, IOException {
final JSONObject ret = new JSONObject();
if (!userUtils.isLoggedIn()) {
response.sendError(HttpServletResponse.SC_FORBIDDEN);
return ret;
}
// TODO: check the file whether is the current user's
final Transaction transaction = fileRepository.beginTransaction();
try {
final String fileId = requestJSONObject.getString(Keys.OBJECT_ID);
fileRepository.remove(fileId);
transaction.commit();
ret.put(Keys.STATUS_CODE, StatusCodes.REMOVE_FILE_SUCC);
PageCaches.removeAll();
} catch (final Exception e) {
if (transaction.isActive()) {
transaction.rollback();
}
LOGGER.log(Level.SEVERE, e.getMessage(), e);
throw new ActionException(e);
}
return ret;
}
/**
* Gets the {@link FileService} singleton.
*
* @return the singleton
*/
public static FileService getInstance() {
return SingletonHolder.SINGLETON;
}
/**
* Private default constructor.
*/
private FileService() {
}
/**
* 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 FileService SINGLETON = new FileService();
/**
* Private default constructor.
*/
private SingletonHolder() {
}
}
}