org.proteios.core
Class ItemKey

java.lang.Object
  org.proteios.core.BasicItem<D>
      org.proteios.core.Key<ItemKeyData>
          org.proteios.core.ItemKey

All Implemented Interfaces:

AccessControlled, Identifiable

public class ItemKey
extends Key<ItemKeyData>

This class is used to get information about which users and groups a Shareable item has been shared to.

An item key is immutable and the user/group/permission combinations cannot be changed once the key has been created. This allows the core to resuse item keys for all items with the same combination of user/group/permission values without fear that someone else may change the permissions.

To create a new item key use the UserPermissions and/or GroupPermissions objects and pass the information to the getNewOrExisting(DbControl, UserPermissions, GroupPermissions) method.

Another option is to use the MultiPermissions object which allows you to modifiy the sharing information of a whole bunch of shareable items in one go. The MultiPermissions class takes care of all the cumbersome work of creating new keys and assigning those to the items for you.

Version:

2.0

Author:

Nicklas

See Also:

Shareable

Field Summary

static Item

TYPE The type of item represented by this class.

Method Summary

static void	deleteUnusedKeys() Delete all keys that are currently not used by any item.
static ItemKey	getById(DbControl dc, int id) Get an ItemKey item when you know the ID.
static ItemKey	getNewOrExisting(DbControl dc, UserPermissions userPermissions, GroupPermissions groupPermissions) Create a new or load an existing ItemKey when you have a combination of user/group/permission values.
Set<Permission>	getPermissions(Group group) Get the permissions for a group.
Set<Permission>	getPermissions(User user) Get the permissions for a user.
Item	getType() Get the type of item represented by the object.
boolean	isUsed() Checks if: A Shareable item is using this key.

Methods inherited from class org.proteios.core.BasicItem

checkPermission, equals, getDbControl, getId, getPermissions, getSessionControl, getVersion, hashCode, hasPermission, isDetached, isInDatabase, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

TYPE

public static final Item TYPE

The type of item represented by this class.

See Also:

Item.ITEMKEY, getType()

Method Detail

getNewOrExisting

public static ItemKey getNewOrExisting(DbControl dc,
                                       UserPermissions userPermissions,
                                       GroupPermissions groupPermissions)
                                throws PermissionDeniedException,
                                       InvalidDataException,
                                       BaseException

Create a new or load an existing ItemKey when you have a combination of user/group/permission values. If the database contains an item key with the same combination that key is loaded and returned, otherwise a new item key is created. If no existing key is found, the new key will immediately be saved and committed to the database using a different transaction. This ensures that no two keys contains identical permissions.

Parameters:

dc - The DbControl which will be used for permission checking and database access

userPermissions - A UserPermissions object holding the permissions for users

groupPermissions - A GroupPermissions object holding the permissions for groups

Returns:

The ItemKey item

Throws:

PermissionDeniedException - If the logged in user tried to share to the Group.EVERYONE group without having Permission.SHARE_TO_EVERYONE permission

InvalidDataException - If not sharing to any user or group

BaseException - If there is an error

getById

public static ItemKey getById(DbControl dc,
                              int id)
                       throws ItemNotFoundException,
                              PermissionDeniedException,
                              BaseException

Get an ItemKey item when you know the ID.

Parameters:

dc - The DbControl which will be used for permission checking and database access.

id - The ID of the item to load

Returns:

The ItemKey item

Throws:

ItemNotFoundException - If an item with the specified ID is not found

PermissionDeniedException - If the logged in user doesn't have Permission.READ permission to the item

BaseException - If there is another error

deleteUnusedKeys

public static void deleteUnusedKeys()
                             throws BaseException

Delete all keys that are currently not used by any item. This method is intended to be executed at regular intervals by a cleanup application.

Throws:

BaseException

getType

public Item getType()

Description copied from interface: Identifiable

Get the type of item represented by the object. The returned value is one of the values defined in the Item enumeration.

Returns:

A value indicating the type of item

isUsed

public boolean isUsed()
               throws BaseException

Checks if:

• A Shareable item is using this key.

Specified by:

isUsed in class BasicItem<ItemKeyData>

Returns:

TRUE if this item is used, FALSE otherwise

Throws:

BaseException

getPermissions

public Set<Permission> getPermissions(User user)
                               throws InvalidDataException

Get the permissions for a user.

Parameters:

user - The User for which we want to get the permission

Returns:

A Set containing the granted permissions, or an empty set if no permissions have been granted

Throws:

InvalidDataException - If the user is null

See Also:

Permission

getPermissions

public Set<Permission> getPermissions(Group group)
                               throws InvalidDataException

Get the permissions for a group.

Parameters:

group - The Group for which we want to get the permission

Returns:

A Set containing the granted permissions, or an empty set if no permissions have been granted

Throws:

InvalidDataException - If the user is null

See Also:

Permission