org.jasig.portal.groups
Class EntityGroupImpl

java.lang.Object
  org.jasig.portal.groups.GroupMemberImpl
      org.jasig.portal.groups.EntityGroupImpl

All Implemented Interfaces:

IEntityGroup, IGroupMember, IBasicEntity

Direct Known Subclasses:

EntityTestingGroupImpl, LockableEntityGroupImpl

public class EntityGroupImpl
extends GroupMemberImpl
implements IEntityGroup

Reference implementation for IEntityGroup.

Groups do not keep references to their members but instead cache member keys. The members are cached externally. The rules for controlling access to the key caches are a bit obscure, but you should understand them before writing code that updates groups. Access to the caches themselves is synchronized via the cache getters and setters. All requests to get group members and to add or remove group members ultimately go through these methods. The mutating methods, addMember() and removeMember() however, do a copy-on-write. That is, they first make a copy of the cache, add or remove the member key, and then replace the original cache with the copy. This permits multiple read and write threads to run concurrently without throwing ConcurrentModificationExceptions. But it still leaves open the danger of data races because nothing in this class guarantees serialized write access. You must impose this from without, either via explicit locking (GroupService.getLockableGroup()) or by synchronizing access from the caller.

Version:

$Revision: 19776 $

Author:

Dan Ellentuck

See Also:

IEntityGroup

Field Summary

protected IIndividualGroupService

localGroupService

Constructor Summary

EntityGroupImpl(String groupKey, Class entityType)
EntityGroupImpl

Method Summary

void	addMember(IGroupMember gm) Adds IGroupMember gm to our member Map and conversely, adds this to gm's group Map, after checking that the addition does not violate group rules.
protected boolean	areMemberKeysInitialized()
protected void	clearPendingUpdates() Clear out caches for pending adds and deletes of group members.
boolean	contains(IGroupMember gm) Checks if GroupMember gm is a member of this.
boolean	deepContains(IGroupMember gm) Checks recursively if GroupMember gm is a member of this.
void	delete() Delegates to the factory.
boolean	equals(Object obj) Answers if Object o is an IGroupMember that refers to the same underlying entity(ies) as this.
HashMap	getAddedMembers()
Iterator	getAllEntities() Returns an Iterator over the Set of this IEntityGroup's recursively-retrieved members that are IEntities.
Iterator	getAllMembers() Returns an Iterator over the Set of recursively-retrieved IGroupMembers that are members of this IEntityGroup.
protected CompositeEntityIdentifier	getCompositeEntityIdentifier() Returns the EntityIdentifier cast to a CompositeEntityIdentifier so that its service nodes can be pushed and popped.
String	getCreatorID() Returns the name of the group creator.
String	getDescription() Returns the group description, which may be null.
Iterator	getEntities() Returns an Iterator over this IEntityGroup's members that are IEntities.
EntityIdentifier	getEntityIdentifier()
String	getEntityKey() Returns the key of the underyling entity.
Class	getEntityType() Returns the entity type of this groups's leaf members.
String	getGroupID()
Class	getLeafType() Returns the entity type of this groups's members.
protected IIndividualGroupService	getLocalGroupService()
String	getLocalKey() Returns the key from the group service of origin.
protected Iterator	getMemberEntities() Returns an Iterator over the entities in our member Collection.
IEntityGroup	getMemberGroupNamed(String name) Returns the named member IEntityGroup.
protected Iterator	getMemberGroups() Returns an Iterator over the groups in our member Collection.
Iterator	getMembers() Returns an Iterator over the GroupMembers in our member Collection.
String	getName() Returns the group name.
HashMap	getRemovedMembers()
protected GroupService	getService()
Name	getServiceName() Returns the Name of the group service of origin.
Class	getType() Returns this object's type for purposes of caching and locking, as opposed to the underlying entity type.
boolean	hasAdds() Answers if there are any added memberships not yet committed to the database.
boolean	hasDeletes() Answers if there are any deleted memberships not yet committed to the database.
int	hashCode() Generates a hash code for the receiver.
boolean	hasMembers() Default implementation, overridden on EntityGroupImpl.
boolean	isDirty() Answers if there are any added or deleted memberships not yet committed to the database.
boolean	isEditable() Answers if this IEntityGroup can be changed or deleted.
boolean	isGroup()
protected void	primAddMember(IGroupMember gm) Adds the IGroupMember key to the appropriate member key cache by copying the cache, adding to the copy, and then replacing the original with the copy.
protected Set	primGetAllEntities(Set entities) Returns the Set of IEntities in our member Collection and, recursively, in the Collections of our members.
protected Set	primGetAllMembers(Set s) Returns the Set of IGroupMembers in our member Collection and, recursively, in the Collections of our members.
protected void	primRemoveMember(IGroupMember gm) Removes the IGroupMember key from the appropriate key cache, by copying the cache, removing the key from the copy and replacing the original with the copy.
void	primSetName(String newName)
void	removeMember(IGroupMember gm) Removes IGroupMember gm from our member Map and, conversely, remove this from gm's group Map.
void	setCreatorID(String newCreatorID)
void	setDescription(String newDescription)
void	setLocalGroupService(IIndividualGroupService newIndividualGroupService) Sets the group service of origin.
void	setName(String newName) We used to check duplicate sibling names but no longer do.
void	setServiceName(Name newServiceName) Sets the service Name of the group service of origin.
String	toString() Returns a String that represents the value of this object.
void	update() Delegate to the factory.
void	updateMembers() Delegate to the factory.

Methods inherited from class org.jasig.portal.groups.GroupMemberImpl

addGroup, castAndCopyHashSet, getAllContainingGroups, getCacheKey, getCompositeGroupService, getContainingGroups, getKey, getUnderlyingEntityIdentifier, isDeepMemberOf, isEntity, isKnownEntityType, isMemberOf, primGetAllContainingGroups, removeGroup, setGroupKeysInitialized

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.jasig.portal.groups.IGroupMember

getAllContainingGroups, getContainingGroups, getKey, getUnderlyingEntityIdentifier, isDeepMemberOf, isEntity, isMemberOf

Field Detail

localGroupService

protected IIndividualGroupService localGroupService

Constructor Detail

EntityGroupImpl

public EntityGroupImpl(String groupKey,
                       Class entityType)
                throws GroupsException

EntityGroupImpl

Throws:

GroupsException

Method Detail

addMember

public void addMember(IGroupMember gm)
               throws GroupsException

Adds IGroupMember gm to our member Map and conversely, adds this to gm's group Map, after checking that the addition does not violate group rules. Remember that we have added it so we can update the database if necessary.

Specified by:

addMember in interface IEntityGroup

Parameters:

gm - org.jasig.portal.groups.IGroupMember

Throws:

GroupsException - is thrown if the member is a group and this group already has a group with the same name or if the addition of the group creates a circular reference.

areMemberKeysInitialized

protected boolean areMemberKeysInitialized()

Returns:

boolean

clearPendingUpdates

protected void clearPendingUpdates()

Clear out caches for pending adds and deletes of group members.

contains

public boolean contains(IGroupMember gm)
                 throws GroupsException

Checks if GroupMember gm is a member of this.

Specified by:

contains in interface IGroupMember

Overrides:

contains in class GroupMemberImpl

Parameters:

gm - org.jasig.portal.groups.IGroupMember

Returns:

boolean

Throws:

GroupsException

deepContains

public boolean deepContains(IGroupMember gm)
                     throws GroupsException

Checks recursively if GroupMember gm is a member of this.

Specified by:

deepContains in interface IGroupMember

Overrides:

deepContains in class GroupMemberImpl

Parameters:

gm - org.jasig.portal.groups.IGroupMember

Returns:

boolean

Throws:

GroupsException

delete

public void delete()
            throws GroupsException

Delegates to the factory.

Specified by:

delete in interface IEntityGroup

Throws:

GroupsException - if the delete cannot be performed.

equals

public boolean equals(Object obj)

Description copied from interface: IGroupMember

Answers if Object o is an IGroupMember that refers to the same underlying entity(ies) as this.

Specified by:

equals in interface IGroupMember

Overrides:

equals in class Object

Parameters:

obj - the Object to compare with

Returns:

true if these Objects are equal; false otherwise.

See Also:

Hashtable

getAddedMembers

public HashMap getAddedMembers()

Returns:

java.util.HashMap

getAllEntities

public Iterator getAllEntities()
                        throws GroupsException

Returns an Iterator over the Set of this IEntityGroup's recursively-retrieved members that are IEntities.

Specified by:

getAllEntities in interface IGroupMember

Overrides:

getAllEntities in class GroupMemberImpl

Returns:

java.util.Iterator

Throws:

GroupsException

getAllMembers

public Iterator getAllMembers()
                       throws GroupsException

Returns an Iterator over the Set of recursively-retrieved IGroupMembers that are members of this IEntityGroup.

Specified by:

getAllMembers in interface IGroupMember

Overrides:

getAllMembers in class GroupMemberImpl

Returns:

java.util.Iterator

Throws:

GroupsException

getCompositeEntityIdentifier

protected CompositeEntityIdentifier getCompositeEntityIdentifier()

Returns the EntityIdentifier cast to a CompositeEntityIdentifier so that its service nodes can be pushed and popped.

Returns:

CompositeEntityIdentifier

getCreatorID

public String getCreatorID()

Description copied from interface: IEntityGroup

Returns the name of the group creator. May be null.

Specified by:

getCreatorID in interface IEntityGroup

Returns:

java.lang.String

getDescription

public String getDescription()

Description copied from interface: IEntityGroup

Returns the group description, which may be null.

Specified by:

getDescription in interface IEntityGroup

Returns:

java.lang.String

getEntities

public Iterator getEntities()
                     throws GroupsException

Returns an Iterator over this IEntityGroup's members that are IEntities.

Specified by:

getEntities in interface IGroupMember

Overrides:

getEntities in class GroupMemberImpl

Returns:

java.util.Iterator

Throws:

GroupsException

getEntityIdentifier

public EntityIdentifier getEntityIdentifier()

Specified by:

getEntityIdentifier in interface IBasicEntity

Returns:

EntityIdentifier

getEntityKey

public String getEntityKey()

Returns the key of the underyling entity.

Returns:

java.lang.String

getEntityType

public Class getEntityType()

Returns the entity type of this groups's leaf members.

Specified by:

getEntityType in interface IGroupMember

Returns:

java.lang.Class

See Also:

EntityTypes

getGroupID

public String getGroupID()

Returns:

String

getLeafType

public Class getLeafType()

Returns the entity type of this groups's members.

Specified by:

getLeafType in interface IGroupMember

Returns:

java.lang.Class

See Also:

EntityTypes

getLocalGroupService

protected IIndividualGroupService getLocalGroupService()

Returns:

IIndividualGroupService

getLocalKey

public String getLocalKey()

Returns the key from the group service of origin.

Specified by:

getLocalKey in interface IEntityGroup

Returns:

String

getMemberEntities

protected Iterator getMemberEntities()
                              throws GroupsException

Returns an Iterator over the entities in our member Collection.

Returns:

java.util.Iterator

Throws:

GroupsException

getMemberGroupNamed

public IEntityGroup getMemberGroupNamed(String name)
                                 throws GroupsException

Returns the named member IEntityGroup.

Specified by:

getMemberGroupNamed in interface IGroupMember

Overrides:

getMemberGroupNamed in class GroupMemberImpl

Parameters:

name - java.lang.String

Returns:

org.jasig.portal.groups.IEntityGroup

Throws:

GroupsException

getMemberGroups

protected Iterator getMemberGroups()
                            throws GroupsException

Returns an Iterator over the groups in our member Collection.

Returns:

java.util.Iterator

Throws:

GroupsException

getMembers

public Iterator getMembers()
                    throws GroupsException

Returns an Iterator over the GroupMembers in our member Collection.

Specified by:

getMembers in interface IGroupMember

Overrides:

getMembers in class GroupMemberImpl

Returns:

java.util.Iterator

Throws:

GroupsException

getName

public String getName()

Description copied from interface: IEntityGroup

Returns the group name.

Specified by:

getName in interface IEntityGroup

Returns:

java.lang.String

getRemovedMembers

public HashMap getRemovedMembers()

Returns:

java.util.HashMap

getService

protected GroupService getService()
                           throws GroupsException

Returns:

IGroupService

Throws:

GroupsException

getServiceName

public Name getServiceName()

Returns the Name of the group service of origin.

Specified by:

getServiceName in interface IEntityGroup

Returns:

javax.naming.Nme

getType

public Class getType()

Returns this object's type for purposes of caching and locking, as opposed to the underlying entity type.

Specified by:

getType in interface IGroupMember

Overrides:

getType in class GroupMemberImpl

Returns:

java.lang.Class

hasAdds

public boolean hasAdds()

Answers if there are any added memberships not yet committed to the database.

Returns:

boolean

hasDeletes

public boolean hasDeletes()

Answers if there are any deleted memberships not yet committed to the database.

Returns:

boolean

hashCode

public int hashCode()

Generates a hash code for the receiver. This method is supported primarily for hash tables, such as those provided in java.util.

Specified by:

hashCode in interface IGroupMember

Overrides:

hashCode in class GroupMemberImpl

Returns:

an integer hash code for the receiver

See Also:

Hashtable

hasMembers

public boolean hasMembers()
                   throws GroupsException

Description copied from class: GroupMemberImpl

Default implementation, overridden on EntityGroupImpl.

Specified by:

hasMembers in interface IGroupMember

Overrides:

hasMembers in class GroupMemberImpl

Returns:

boolean

Throws:

GroupsException

isDirty

public boolean isDirty()

Answers if there are any added or deleted memberships not yet committed to the database.

Returns:

boolean

isEditable

public boolean isEditable()
                   throws GroupsException

Answers if this IEntityGroup can be changed or deleted.

Specified by:

isEditable in interface IEntityGroup

Returns:

boolean

Throws:

GroupsException

isGroup

public boolean isGroup()

Specified by:

isGroup in interface IGroupMember

Overrides:

isGroup in class GroupMemberImpl

Returns:

boolean

primAddMember

protected void primAddMember(IGroupMember gm)
                      throws GroupsException

Adds the IGroupMember key to the appropriate member key cache by copying the cache, adding to the copy, and then replacing the original with the copy. At this point, gm does not yet have this in its containing group cache. That cache entry is not added until update(), when changes are committed to the store.

Parameters:

gm - org.jasig.portal.groups.IGroupMember

Throws:

GroupsException

primGetAllEntities

protected Set primGetAllEntities(Set entities)
                          throws GroupsException

Returns the Set of IEntities in our member Collection and, recursively, in the Collections of our members.

Parameters:

entities - a Set that IEntity-GroupMembers are added to.

Returns:

java.util.Set

Throws:

GroupsException

primGetAllMembers

protected Set primGetAllMembers(Set s)
                         throws GroupsException

Returns the Set of IGroupMembers in our member Collection and, recursively, in the Collections of our members.

Parameters:

s - java.lang.Set - a Set that members are added to.

Returns:

java.util.Set

Throws:

GroupsException

primRemoveMember

protected void primRemoveMember(IGroupMember gm)
                         throws GroupsException

Removes the IGroupMember key from the appropriate key cache, by copying the cache, removing the key from the copy and replacing the original with the copy. At this point, gm still has this in its containing groups cache. That cache entry is not removed until update(), when changes are committed to the store.

Parameters:

gm - org.jasig.portal.groups.IGroupMember

Throws:

GroupsException

primSetName

public void primSetName(String newName)

Parameters:

newName - java.lang.String

removeMember

public void removeMember(IGroupMember gm)
                  throws GroupsException

Removes IGroupMember gm from our member Map and, conversely, remove this from gm's group Map. Remember that we have removed it so we can update the database, if necessary.

Specified by:

removeMember in interface IEntityGroup

Parameters:

gm - org.jasig.portal.groups.IGroupMember

Throws:

GroupsException

setCreatorID

public void setCreatorID(String newCreatorID)

Specified by:

setCreatorID in interface IEntityGroup

Parameters:

newCreatorID - java.lang.String

setDescription

public void setDescription(String newDescription)

Specified by:

setDescription in interface IEntityGroup

Parameters:

newDescription - java.lang.String

setLocalGroupService

public void setLocalGroupService(IIndividualGroupService newIndividualGroupService)
                          throws GroupsException

Description copied from interface: IEntityGroup

Sets the group service of origin.

Specified by:

setLocalGroupService in interface IEntityGroup

Parameters:

newIndividualGroupService - IIndividualGroupService

Throws:

GroupsException

setName

public void setName(String newName)
             throws GroupsException

We used to check duplicate sibling names but no longer do.

Specified by:

setName in interface IEntityGroup

Parameters:

newName - java.lang.String

Throws:

GroupsException

setServiceName

public void setServiceName(Name newServiceName)
                    throws GroupsException

Sets the service Name of the group service of origin.

Throws:

GroupsException

toString

public String toString()

Returns a String that represents the value of this object.

Overrides:

toString in class Object

Returns:

a string representation of the receiver

update

public void update()
            throws GroupsException

Delegate to the factory.

Specified by:

update in interface IEntityGroup

Throws:

GroupsException - if the update cannot be performed.

updateMembers

public void updateMembers()
                   throws GroupsException

Delegate to the factory.

Specified by:

updateMembers in interface IEntityGroup

Throws:

GroupsException - if the update cannot be performed.