Synnefo

/*

 * Copyright 2007, 2008, 2009 Electronic Business Systems Ltd.

 *

 * This file is part of GSS.

 *

 * GSS is free software: you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation, either version 3 of the License, or

 * (at your option) any later version.

 *

 * GSS is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with GSS.  If not, see <http://www.gnu.org/licenses/>.

 */

package gr.ebs.gss.server.ejb;

import gr.ebs.gss.client.exceptions.DuplicateNameException;

import gr.ebs.gss.client.exceptions.GSSIOException;

import gr.ebs.gss.client.exceptions.InsufficientPermissionsException;

import gr.ebs.gss.client.exceptions.ObjectNotFoundException;

import gr.ebs.gss.client.exceptions.QuotaExceededException;

import gr.ebs.gss.server.domain.FileUploadStatus;

import gr.ebs.gss.server.domain.Nonce;

import gr.ebs.gss.server.domain.User;

import gr.ebs.gss.server.domain.dto.FileBodyDTO;

import gr.ebs.gss.server.domain.dto.FileHeaderDTO;

import gr.ebs.gss.server.domain.dto.FolderDTO;

import gr.ebs.gss.server.domain.dto.GroupDTO;

import gr.ebs.gss.server.domain.dto.PermissionDTO;

import gr.ebs.gss.server.domain.dto.StatsDTO;

import gr.ebs.gss.server.domain.dto.UserDTO;

import java.io.File;

import java.io.IOException;

import java.io.InputStream;

import java.util.Date;

import java.util.List;

import java.util.Set;

import javax.ejb.Local;

import javax.ejb.TransactionAttribute;

import javax.ejb.TransactionAttributeType;

/**

 * The External API for GSS clients.

 *

 * @author past

 */

@Local

public interface ExternalAPI {

        /**

         * Retrieves the root folder for the specified user. The caller must ensure

         * that the userId exists.

         *

         * @param userId

         * @return Folder

         * @throws ObjectNotFoundException if no Folder or user was found

         */

        public FolderDTO getRootFolder(Long userId) throws ObjectNotFoundException;

        /**

         * Retrieve the folder with the specified ID.

         *

         * @param userId the ID of the current user

         * @param folderId the ID of the folder to retrieve

         * @return the folder found

         * @throws ObjectNotFoundException if the folder or the user was not found

         * @throws InsufficientPermissionsException if ther user does not have read permissions for folder

         */

        public FolderDTO getFolder(Long userId, Long folderId) throws ObjectNotFoundException,

                        InsufficientPermissionsException;

        /**

         * Returns the user with the specified ID.

         *

         * @param userId The ID of the User to be found

         * @return The User object

         * @throws ObjectNotFoundException if the user cannot be found

         */

        public User getUser(Long userId) throws ObjectNotFoundException;

        /**

         * Returns the user with the specified ID.

         *

         * @param userId The ID of the User to be found

         * @return The User object

         * @throws ObjectNotFoundException if the user cannot be found

         */

        public UserDTO getUserDTO(Long userId) throws ObjectNotFoundException;

        /**

         * Returns the group with the specified ID.

         *

         * @param groupId The ID of the Group to be found

         * @return The Group object

         * @throws ObjectNotFoundException if the group cannot be found

         */

        public GroupDTO getGroup(Long groupId) throws ObjectNotFoundException;

        /**

         * Returns the group with the specified name that belongs to the

         * specified user.

         *

         * @param userId the ID of the user

         * @param name the name of the group

         * @return The Group object

         * @throws ObjectNotFoundException if the group cannot be found

         */

        public GroupDTO getGroup(Long userId, String name) throws ObjectNotFoundException;

        /**

         * Retrieve the list of groups for a particular user.

         *

         * @param userId the ID of the User

         * @return a List of Groups that belong to the specified User

         * @throws ObjectNotFoundException if the user was not found

         */

        public List<GroupDTO> getGroups(Long userId) throws ObjectNotFoundException;

        /**

         * Returns a list of files contained in the folder specified by its id.

         *

         * @param userId the ID of the User

         * @param folderId the ID of the folder containing the files

         * @param ignoreDeleted

         * @return the list of file header objects

         * @throws ObjectNotFoundException if the user or the folder cannot be found

         * @throws InsufficientPermissionsException

         */

        public List<FileHeaderDTO> getFiles(Long userId, Long folderId, boolean ignoreDeleted) throws ObjectNotFoundException,

                        InsufficientPermissionsException;

        /**

         * Returns a list of users for the specified group

         *

         * @param userId the ID of the User

         * @param groupId the ID of the requested group

         * @return List<UserDTO>

         * @throws ObjectNotFoundException if the user or group was not found, with

         *             the exception message mentioning the precise problem

         */

        public List<UserDTO> getUsers(Long userId, Long groupId) throws ObjectNotFoundException;

        /**

         * Returns a list of users matching the specified username

         *

         * @param username the username of the User

         * @return List<UserDTO>

         */

        public List<UserDTO> getUsersByUserNameLike(String username);

        /**

         * Creates a new folder with the specified owner, parent folder and name.

         * New folder has the same permissions as its parent

         *

         * @param userId

         * @param parentId

         * @param name

         * @return the new folder

         * @throws DuplicateNameException if the specified name already exists in

         *             the parent folder, as either a folder or file

         * @throws ObjectNotFoundException if the user or parent folder was not

         *             found, with the exception message mentioning the precise

         *             problem

         * @throws InsufficientPermissionsException

         */

        public FolderDTO createFolder(Long userId, Long parentId, String name) throws DuplicateNameException,

                        ObjectNotFoundException, InsufficientPermissionsException;

        /**

         * Deletes the specified folder, if the specified user has the appropriate

         * permission.

         *

         * @param userId the ID of the current user

         * @param folderId the ID of the folder to delete

         * @throws InsufficientPermissionsException if the user does not have the

         *             appropriate privileges

         * @throws ObjectNotFoundException if the user or folder was not found, with

         *             the exception message mentioning the precise problem

         */

        public void deleteFolder(Long userId, Long folderId)

                        throws InsufficientPermissionsException, ObjectNotFoundException;

        /**

         * Retrieve the subfolders of the specified folder.

         *

         * @param userId the ID of the current user

         * @param folderId the ID of the folder to retrieve

         * @return the list of subfolders found

         * @throws ObjectNotFoundException if the folder or user was not found

         * @throws InsufficientPermissionsException

         */

        public List<FolderDTO> getSubfolders(Long userId, Long folderId)

                        throws ObjectNotFoundException, InsufficientPermissionsException;

        /**

         * Retrieve the folder with the specified ID with subfolders.

         *

         * @param userId the ID of the current user

         * @param folderId the ID of the folder to retrieve

         * @return the folder found

         * @throws ObjectNotFoundException if the folder or the user was not found

         * @throws InsufficientPermissionsException if ther user does not have read permissions for folder

         */

        public FolderDTO getFolderWithSubfolders(Long userId, Long folderId)

                        throws ObjectNotFoundException, InsufficientPermissionsException;

        /**

         * Retrieve the folder with the specified ID with subfolders.

         *

         * @param userId the ID of the current user

         * @param callingUserId the ID of the user requesting this operation

         * @param folderId the ID of the folder to retrieve

         * @return the folder found

         * @throws ObjectNotFoundException if the folder or the user was not found

         * @throws InsufficientPermissionsException if ther user does not have read permissions for folder

         */

        public FolderDTO getFolderWithSubfolders(Long userId, Long callingUserId, Long folderId)

                        throws ObjectNotFoundException, InsufficientPermissionsException;

        /**

         * Retrieve the subfolders of the specified folder that are shared to others.

         *

         * @param userId the ID of the current user

         * @param folderId the ID of the folder to retrieve

         * @return the list of subfolders found

         * @throws ObjectNotFoundException if the folder or user was not found

         */

        public List<FolderDTO> getSharedSubfolders(Long userId, Long folderId) throws ObjectNotFoundException;

        /**

         * Retrieve the subfolders of the specified folder that are shared to others.

         *

         * @param userId the ID of the current user

         * @param callingUserId the id of the user requesting this operation

         * @param folderId the ID of the folder to retrieve

         * @return the list of subfolders found

         * @throws ObjectNotFoundException if the folder or user was not found

         */

        public List<FolderDTO> getSharedSubfolders(Long userId, Long callingUserId, Long folderId) throws ObjectNotFoundException;

        /**

         * Modifies the specified folder if the specified user has the appropriate

         * permission.

         *

         * @param userId the ID of the current user

         * @param folderId the ID of the folder to retrieve

         * @param folderName

         * @return the updated folder

         * @throws InsufficientPermissionsException if the user does not have the

         *             appropriate privileges

         * @throws ObjectNotFoundException if the user or folder was not found, with

         *             the exception message mentioning the precise problem

         * @throws DuplicateNameException if the specified name already exists in

         *             the parent folder, as either a folder or file

         */

        public FolderDTO modifyFolder(Long userId, Long folderId, String folderName)

                        throws InsufficientPermissionsException, ObjectNotFoundException, DuplicateNameException;

        /**

         * Adds a user to the specified group

         *

         * @param userId the ID of the current user

         * @param groupId the id of the new group

         * @param userToAddId the id of the user to add

         * @throws DuplicateNameException if the user already exists in group

         * @throws ObjectNotFoundException if the user or group was not found, with

         *             the exception message mentioning the precise problem

         * @throws InsufficientPermissionsException

         */

        public void addUserToGroup(Long userId, Long groupId, Long userToAddId)

                        throws ObjectNotFoundException, DuplicateNameException, InsufficientPermissionsException;

        /**

         * Creates a new group with the specified owner and name.

         *

         * @param userId the ID of the current user

         * @param name the name of the new group

         * @throws DuplicateNameException if the new group name already exists

         * @throws ObjectNotFoundException if the user or group was not found, with

         *             the exception message mentioning the precise problem

         */

        public void createGroup(Long userId, String name) throws ObjectNotFoundException, DuplicateNameException;

        /**

         * Deletes the specified group in the specified user's namespace.

         *

         * @param userId the ID of the current user

         * @param groupId the ID of the group to delete

         * @throws ObjectNotFoundException if the user or group was not found, with

         *             the exception message mentioning the precise problem

         * @throws InsufficientPermissionsException

         */

        public void deleteGroup(Long userId, Long groupId) throws ObjectNotFoundException, InsufficientPermissionsException;

        /**

         * Creates a new file with the specified owner, parent folder and name. The

         * new file has the same permissions as its parent folder. The file contents

         * are read from the input stream to a new File object.

         *

         * @param userId the ID of the current user

         * @param folderId the ID of the parent folder

         * @param name the name of the new file

         * @param mimeType the MIME type of the file

         * @param stream the input stream with the file contents

         * @return The FileHeaderDTO created

         * @throws DuplicateNameException if the specified name already exists in

         *             the parent folder, as either a folder or file

         * @throws ObjectNotFoundException if the user or parent folder was not

         *             found, with the exception message mentioning the precise

         *             problem

         * @throws GSSIOException if there was an error while storing the file contents

         * @throws InsufficientPermissionsException

         * @throws QuotaExceededException

         */

        public FileHeaderDTO createFile(Long userId, Long folderId, String name, String mimeType,

                                InputStream stream) throws DuplicateNameException, ObjectNotFoundException,

                                GSSIOException, InsufficientPermissionsException, QuotaExceededException;

        /**

         * Deletes the specified file, provided the specified user has

         * the necessary permissions.

         *

         * @param userId the ID of the current user

         * @param fileId the ID of the file to delete

         * @throws ObjectNotFoundException if the user or file was not found, with

         *             the exception message mentioning the precise problem

         * @throws InsufficientPermissionsException if the user does not have the

         *             appropriate privileges

         */

        public void deleteFile(Long userId, Long fileId) throws ObjectNotFoundException, InsufficientPermissionsException;

        /**

         * Deletes the specified file in the specified user's namespace.

         *

         * @param userId the ID of the current user

         * @param fileIds the IDs of the files to delete

         * @throws ObjectNotFoundException if the user or file was not found, with

         *             the exception message mentioning the precise problem

         * @throws InsufficientPermissionsException if the user does not have the

         *             appropriate privileges

         */

        public void deleteFiles(Long userId, List<Long> fileIds)

                        throws ObjectNotFoundException, InsufficientPermissionsException;

        /**

         * Creates a new tag for the specified user and file.

         *

         * @param userId the creator of the tag

         * @param fileHeaderId the file that is tagged

         * @param tag the tag

         * @throws ObjectNotFoundException if the user or the file was not found

         */

        public void createTag(Long userId, Long fileHeaderId, String tag) throws ObjectNotFoundException;

        /**

         * Returns all tags defined by the specified user

         *

         * @param userId

         * @return Set<String>

         * @throws ObjectNotFoundException if the user was null

         */

        public Set<String> getUserTags(final Long userId) throws ObjectNotFoundException;

        /**

         * Updates name and tags for the specified file

         *

         * @param userId

         * @param fileId

         * @param name

         * @param tagSet a String that contains tags separated by comma

         * @throws ObjectNotFoundException

         * @throws InsufficientPermissionsException

         */

        public void updateFile(Long userId, Long fileId, String name, String tagSet)

                        throws ObjectNotFoundException, InsufficientPermissionsException;

        /**

         * Retrieve the contents of the current body for the file

         * with the specified FileHeader ID. The file contents

         * are provided as an InputStream from which the caller can

         * retrieve the raw bytes.

         *

         * @param userId the ID of the current user

         * @param fileId the ID of the file to retrieve

         * @return an InputStream from the current file body contents

         * @throws ObjectNotFoundException if the file or the user was not found

         * @throws InsufficientPermissionsException  if the user does not have the

         *             appropriate privileges

         */

        public InputStream getFileContents(Long userId, Long fileId)

                        throws ObjectNotFoundException, InsufficientPermissionsException;

        /**

         * Retrieve the contents of the  body identified by bodyId for the file

         * with the specified FileHeader ID. The file contents

         * are provided as an InputStream from which the caller can

         * retrieve the raw bytes.

         *

         * @param userId the ID of the current user

         * @param fileId the ID of the file to retrieve

         * @param bodyId the body ID

         * @return an InputStream from the current file body contents

         * @throws ObjectNotFoundException if the file or the user was not found

         * @throws InsufficientPermissionsException  if the user does not have the

         *             appropriate privileges

         */

        public InputStream getFileContents(Long userId, Long fileId, Long bodyId)

                        throws ObjectNotFoundException, InsufficientPermissionsException;

        /**

         * Retrieve the file with the specified ID.

         *

         * @param userId the ID of the current user

         * @param fileId the ID of the file to retrieve

         * @return the file found

         * @throws ObjectNotFoundException if the file or the user was not found, with

         *                         the exception message mentioning the precise problem

         * @throws InsufficientPermissionsException

         */

        public FileHeaderDTO getFile(Long userId, Long fileId) throws ObjectNotFoundException,

                        InsufficientPermissionsException;

        /**

         * Retrieve the filebody with the specified ID.

         *

         * @param userId the ID of the current user

         * @param fileId the ID of the file to retrieve

         * @param bodyId the ID of the body

         * @return the file found

         * @throws ObjectNotFoundException if the file or the user was not found, with

         *                         the exception message mentioning the precise problem

         * @throws InsufficientPermissionsException

         */

        public FileBodyDTO getFileBody(Long userId, Long fileId, Long bodyId)

                        throws ObjectNotFoundException, InsufficientPermissionsException;

        /**

         * Get the resource (file or folder) at the specified path in

         * the specified user's namespace. The returned object will be of type

         * FileHeaderDTO or FolderDTO.<p><strong>Note:</strong> this method does not

         * receive the current user as a parameter, therefore it is unable to perform

         * the necessary permission checks and should <strong>NOT</strong> be directly

         * exposed to remote clients. It is the caller's responsibility to verify that

         * the calling user has the required privileges for performing any subsequent

         * action on the resource through one of the other ExternalAPI methods.

         *

         * @param ownerId the ID of the user owning the namespace

         * @param path the absolute path in the user's namespace

         * @param ignoreDeleted if true, resources that have been moved to the trash

         *                         will be ignored

         * @throws ObjectNotFoundException if the user or resource was not found, with

         *                         the exception message mentioning the precise problem

         * @return the resource found

         */

        public Object getResourceAtPath(Long ownerId, String path, boolean ignoreDeleted)

                        throws ObjectNotFoundException;

        /**

         * Copy the provided file to the specified destination.

         *

         * @param userId the ID of the current user

         * @param fileId the IF of the provided file

         * @param dest the path of the new resource

         * @throws ObjectNotFoundException if the user, file or destination was not

         *                         found, with        the exception message mentioning the precise problem

         * @throws DuplicateNameException if the specified name already exists in

         *          the destination folder, as either a folder or file

         * @throws GSSIOException if there was an error while accessing the file contents

         * @throws InsufficientPermissionsException

         * @throws QuotaExceededException

         */

        public void copyFile(Long userId, Long fileId, String dest) throws ObjectNotFoundException,

                        DuplicateNameException, GSSIOException, InsufficientPermissionsException, QuotaExceededException;

        /**

         * Copy the provided file to the specified destination.

         *

         * @param userId the ID of the current user

         * @param ownerId the ID of the owner of the destination namespace

         * @param fileId the IF of the provided file

         * @param dest the path of the new resource

         * @throws ObjectNotFoundException if the user, file or destination was not

         *                         found, with        the exception message mentioning the precise problem

         * @throws DuplicateNameException if the specified name already exists in

         *          the destination folder, as either a folder or file

         * @throws GSSIOException if there was an error while accessing the file contents

         * @throws InsufficientPermissionsException

         * @throws QuotaExceededException

         */

        public void copyFileToPath(Long userId, Long ownerId, Long fileId, String dest) throws ObjectNotFoundException,

                        DuplicateNameException, GSSIOException, InsufficientPermissionsException, QuotaExceededException;

        /**

         * Copy the provided file to the specified destination.

         *

         * @param userId the ID of the current user

         * @param fileIds the IDs of the provided files

         * @param destId the ID of the destination folder

         * @throws ObjectNotFoundException if the user, file or destination was not

         *                         found, with        the exception message mentioning the precise problem

         * @throws GSSIOException if there was an error while accessing the file contents

         * @throws DuplicateNameException if the specified name already exists in

         *          the destination folder, as either a folder or file

         * @throws InsufficientPermissionsException

         * @throws QuotaExceededException

         */

        public void copyFiles(Long userId, List<Long> fileIds, Long destId)

                        throws ObjectNotFoundException, DuplicateNameException, GSSIOException,

                        InsufficientPermissionsException, QuotaExceededException;

        /**

         * Copy the provided file to the specified destination.

         *

         * @param userId the ID of the current user

         * @param fileId the IF of the provided file

         * @param destId the ID of the destination folder

         * @param destName the name of the new file

         * @throws ObjectNotFoundException if the user, file or destination was not

         *                         found, with        the exception message mentioning the precise problem

         * @throws GSSIOException if there was an error while accessing the file contents

         * @throws DuplicateNameException if the specified name already exists in

         *          the destination folder, as either a folder or file

         * @throws InsufficientPermissionsException

         * @throws QuotaExceededException

         */

        public void copyFile(Long userId, Long fileId, Long destId, String destName)

                        throws ObjectNotFoundException, DuplicateNameException, GSSIOException,

                        InsufficientPermissionsException, QuotaExceededException;

        /**

         * Copy the provided folder to the specified destination.

         *

         * @param userId the ID of the current user

         * @param folderId the IF of the provided folder

         * @param dest the path of the new folder

         * @throws ObjectNotFoundException if the user, folder or destination was not

         *                         found, with        the exception message mentioning the precise problem

         * @throws DuplicateNameException if the specified name already exists in

         *          the destination folder, as either a folder or file

         * @throws InsufficientPermissionsException InsufficientPermissionsException if the user does not have the

         *          appropriate privileges

         */

        public void copyFolder(Long userId, Long folderId, String dest) throws ObjectNotFoundException,

                        DuplicateNameException, InsufficientPermissionsException;

        /**

         * Copy the provided folder to the specified destination.

         *

         * @param userId the ID of the current user

         * @param folderId the IF of the provided folder

         * @param destId the ID of the destination folder

         * @param destName the name of the new folder

         * @throws ObjectNotFoundException if the user, folder or destination was not

         *                         found, with        the exception message mentioning the precise problem

         * @throws DuplicateNameException if the specified name already exists in

         *          the destination folder, as either a folder or file

         * @throws InsufficientPermissionsException InsufficientPermissionsException

         *                         if the user does not have the appropriate privileges

         */

        public void copyFolder(Long userId, Long folderId, Long destId, String destName)

                        throws ObjectNotFoundException, DuplicateNameException, InsufficientPermissionsException;

        /**

         * Copy the provided folder and all its subfolders and files to the specified destination.

         *

         * @param userId the ID of the current user

         * @param ownerId the ID of the owner of the destination namespace

         * @param folderId the IF of the provided folder

         * @param dest the path of the new folder

         * @throws ObjectNotFoundException if the user, folder or destination was not

         *                         found, with        the exception message mentioning the precise problem

         * @throws DuplicateNameException if the specified name already exists in

         *          the destination folder, as either a folder or file

         * @throws InsufficientPermissionsException InsufficientPermissionsException if the user does not have the

         *          appropriate privileges

         * @throws QuotaExceededException if the user quota limit would be exceeded

         * @throws GSSIOException if there was an error while accessing the file contents

         */

        public void copyFolderStructureToPath(Long userId, Long ownerId, Long folderId, String dest) throws ObjectNotFoundException,

                        DuplicateNameException, InsufficientPermissionsException, GSSIOException, QuotaExceededException;

        /**

         * Copy the provided folder and all its subfolders and files to the specified destination.

         *

         * @param userId the ID of the current user

         * @param folderId the IF of the provided folder

         * @param destId the ID of the destination folder

         * @param destName the name of the new folder

         * @throws ObjectNotFoundException if the user, folder or destination was not

         *                         found, with        the exception message mentioning the precise problem

         * @throws DuplicateNameException if the specified name already exists in

         *          the destination folder, as either a folder or file

         * @throws InsufficientPermissionsException InsufficientPermissionsException

         *                         if the user does not have the appropriate privileges

         * @throws GSSIOException if there was an error while accessing the file contents

         * @throws QuotaExceededException if the user quota limit would be exceeded

         */

        public void copyFolderStructure(Long userId, Long folderId, Long destId, String destName)

                        throws ObjectNotFoundException, DuplicateNameException, InsufficientPermissionsException,

                        GSSIOException, QuotaExceededException;

        /**

         * Marks  the specified file as deleted in the specified user's namespace.

         *

         * @param userId the ID of the current user

         * @param fileId the ID of the file to delete

         * @throws ObjectNotFoundException if the user or file was not found, with

         *             the exception message mentioning the precise problem

         * @throws InsufficientPermissionsException if the user does not have the

         *             appropriate privileges

         */

        public void moveFileToTrash(Long userId, Long fileId) throws ObjectNotFoundException,

                        InsufficientPermissionsException;

        /**

         * Marks  the specified deleted file as undeleted in the specified user's namespace.

         *

         * @param userId the ID of the current user

         * @param fileId the ID of the file to undelete

         * @throws ObjectNotFoundException if the user or file was not found, with

         *             the exception message mentioning the precise problem

         * @throws InsufficientPermissionsException if the user does not have the

         *             appropriate privileges

         *

         */

        public void removeFileFromTrash(Long userId, Long fileId) throws ObjectNotFoundException, InsufficientPermissionsException;

        /**

         * Marks  the specified files as deleted in the specified user's namespace.

         *

         * @param userId the ID of the current user

         * @param fileIds the IDs of the file to delete

         * @throws ObjectNotFoundException if the user or file was not found, with

         *             the exception message mentioning the precise problem

         * @throws InsufficientPermissionsException if the user does not have the

         *             appropriate privileges

         */

        public void moveFilesToTrash(Long userId, List<Long> fileIds)

                        throws ObjectNotFoundException, InsufficientPermissionsException;

        /**

         * Marks  the specified deleted files as undeleted in the specified user's namespace.

         *

         * @param userId the ID of the current user

         * @param fileIds the IDs of the file to undelete

         * @throws ObjectNotFoundException if the user or file was not found, with

         *             the exception message mentioning the precise problem

         * @throws InsufficientPermissionsException if the user does not have the

         *             appropriate privileges

         */

        public void removeFilesFromTrash(Long userId, List<Long> fileIds) throws ObjectNotFoundException, InsufficientPermissionsException;

        /**

         * Marks  the specified folder as deleted in the specified user's namespace.

         *

         * @param userId the ID of the current user

         * @param folderId the ID of the folder to delete

         * @throws ObjectNotFoundException if the user or file was not found, with

         *             the exception message mentioning the precise problem

         * @throws InsufficientPermissionsException if the user does not have the

         *             appropriate privileges

         */

        public void moveFolderToTrash(Long userId, Long folderId)

                        throws ObjectNotFoundException, InsufficientPermissionsException;

        /**

         * Marks  the specified deleted folder as undeleted in the specified user's namespace.

         *

         * @param userId the ID of the current user

         * @param folderId the ID of the folder to undelete

         * @throws ObjectNotFoundException if the user or file was not found, with

         *             the exception message mentioning the precise problem

         * @throws InsufficientPermissionsException if the user does not have the

         *          appropriate privileges

         *

         */

        public void removeFolderFromTrash(Long userId, Long folderId) throws ObjectNotFoundException, InsufficientPermissionsException;

        /**

         * Move the provided folder and all its subfolders and files to the specified destination.

         *

         * @param userId the ID of the current user

         * @param folderId the IF of the provided folder

         * @param destId the ID of the destination folder

         * @param destName the name of the new folder

         * @throws ObjectNotFoundException if the user, folder or destination was not

         *                         found, with        the exception message mentioning the precise problem

         * @throws DuplicateNameException if the specified name already exists in

         *          the destination folder, as either a folder or file

         * @throws InsufficientPermissionsException if the user does not have the

         *          appropriate privileges

         * @throws GSSIOException

         * @throws QuotaExceededException

         */

        public void moveFolder(Long userId, Long folderId, Long destId, String destName)

                        throws ObjectNotFoundException, DuplicateNameException, InsufficientPermissionsException,

                        GSSIOException, QuotaExceededException;

        /**

         * Move the provided folder and all its subfolders and files to the specified destination.

         *

         * @param userId the ID of the current user

         * @param ownerId the owner of the destination namespace

         * @param folderId the IF of the provided folder

         * @param dest the path of the new folder

         * @throws ObjectNotFoundException if the user, folder or destination was not

         *                         found, with        the exception message mentioning the precise problem

         * @throws DuplicateNameException if the specified name already exists in

         *          the destination folder, as either a folder or file

         * @throws InsufficientPermissionsException InsufficientPermissionsException if the user does not have the

         *          appropriate privileges

         * @throws GSSIOException

         * @throws QuotaExceededException

         */

        public void moveFolderToPath(Long userId, Long ownerId, Long folderId, String dest) throws ObjectNotFoundException,

                        DuplicateNameException, InsufficientPermissionsException, GSSIOException, QuotaExceededException;

        /**

         * Move the provided file to the specified destination.

         *

         * @param userId the ID of the current user

         * @param fileId the IF of the provided file

         * @param destId the ID of the destination folder

         * @param destName the name of the new file

         * @throws InsufficientPermissionsException

         * @throws ObjectNotFoundException if the user, file or destination was not

         *                         found, with        the exception message mentioning the precise problem

         * @throws GSSIOException if there was an error while accessing the file contents

         * @throws DuplicateNameException if the specified name already exists in

         *          the destination folder, as either a folder or file

         * @throws QuotaExceededException

         */

        public void moveFile(Long userId, Long fileId, Long destId, String destName)

                        throws InsufficientPermissionsException, ObjectNotFoundException,

                        DuplicateNameException, GSSIOException, QuotaExceededException;

        /**

         * Move the provided file to the specified destination.

         *

         * @param userId the ID of the current user

         * @param ownerId the owner of the destination namespace

         * @param fileId the IF of the provided file

         * @param dest the path of the new file

         * @throws InsufficientPermissionsException

         * @throws ObjectNotFoundException if the user, file or destination was not

         *                         found, with        the exception message mentioning the precise problem

         * @throws GSSIOException if there was an error while accessing the file contents

         * @throws DuplicateNameException if the specified name already exists in

         *          the destination folder, as either a folder or file

         * @throws QuotaExceededException

         */

        public void moveFileToPath(Long userId, Long ownerId, Long fileId, String dest) throws ObjectNotFoundException, InsufficientPermissionsException, DuplicateNameException, GSSIOException, QuotaExceededException;

        /**

         * move the provided file to the specified destination.

         *

         * @param userId the ID of the current user

         * @param fileIds the IDs of the provided files

         * @param destId the ID of the destination folder

         * @throws InsufficientPermissionsException

         * @throws ObjectNotFoundException if the user, file or destination was not

         *                         found, with        the exception message mentioning the precise problem

         * @throws GSSIOException if there was an error while accessing the file contents

         * @throws DuplicateNameException if the specified name already exists in

         *          the destination folder, as either a folder or file

         * @throws QuotaExceededException

         */

        public void moveFiles(Long userId, List<Long> fileIds, Long destId)

                        throws InsufficientPermissionsException, ObjectNotFoundException,

                        DuplicateNameException, GSSIOException, QuotaExceededException;

        /**

         * Returns a list of All deleted files of a user.

         *

         * @param userId the ID of the User

         *          * @return the list of deleted file header objects

         * @throws ObjectNotFoundException if the user cannot be found

         */

        public List<FileHeaderDTO> getDeletedFiles(Long userId) throws ObjectNotFoundException;

        /**

         * Returns a list of All deleted root folders of a user.

         *

         * @param userId the ID of the User

         *          * @return the list of deleted file header objects

         * @throws ObjectNotFoundException if the user cannot be found

         */

        public List<FolderDTO> getDeletedRootFolders(Long userId) throws ObjectNotFoundException;

        /**

         * Empty Trash by deleting all marked as deleted files and folders

         * @param userId

         * @throws ObjectNotFoundException if something goes wrong in the delete process

         * @throws InsufficientPermissionsException if something goes wrong in the delete process

         */

        public void emptyTrash(Long userId) throws ObjectNotFoundException, InsufficientPermissionsException;

        /**

         * Restores All Trashed Items by undeleting all marked as deleted files and folders

         * @param userId

         * @throws ObjectNotFoundException if something goes wrong in the delete process

         * @throws InsufficientPermissionsException

         */

        public void restoreTrash(Long userId) throws ObjectNotFoundException, InsufficientPermissionsException;

        /**

         * Search the system for a user with the specified username.

         * If no such user is found, the method returns null.

         *

         * @param username the username to search for

         * @return the User object with the specified username

         */

        public User findUser(String username);

        /**

         * Create a new user with the specified name, username and e-mail address.

         *

         * @param username the username of the new user

         * @param name the full name of the new user

         * @param mail the e-mail of the new user

         * @return the newly-created User object

         * @throws DuplicateNameException if a user with the same username already exists

         * @throws ObjectNotFoundException if no username was provided

         */

        public User createUser(String username, String name, String mail)

                        throws DuplicateNameException, ObjectNotFoundException;