/**
* Deletes a group from the system.
*
* @param group the group to delete.
*/
public void deleteGroup(Group group) {
// Fire event.
GroupEventDispatcher.dispatchEvent(
group, GroupEventDispatcher.EventType.group_deleting, Collections.emptyMap());
// Delete the group.
provider.deleteGroup(group.getName());
// Expire all relevant caches.
groupCache.remove(group.getName());
}
/**
* Returns a Group by name.
*
* @param name The name of the group to retrieve
* @return The group corresponding to that name
* @throws GroupNotFoundException if the group does not exist.
*/
public Group getGroup(String name) throws GroupNotFoundException {
Group group = (Group) groupCache.get(name);
// If ID wan't found in cache, load it up and put it there.
if (group == null) {
synchronized (name.intern()) {
group = (Group) groupCache.get(name);
// If ID wan't found in cache, load it up and put it there.
if (group == null) {
group = provider.getGroup(name);
groupCache.put(name, group);
}
}
}
return group;
}
/**
* Factory method for creating a new Group. A unique name is the only required field.
*
* @param name the new and unique name for the group.
* @return a new Group.
* @throws GroupAlreadyExistsException if the group name already exists in the system.
*/
public Group createGroup(String name) throws GroupAlreadyExistsException {
synchronized (name.intern()) {
Group newGroup = null;
try {
getGroup(name);
// The group already exists since now exception, so:
throw new GroupAlreadyExistsException();
} catch (GroupNotFoundException unfe) {
// The group doesn't already exist so we can create a new group
newGroup = provider.createGroup(name);
groupCache.put(name, newGroup);
// Fire event.
GroupEventDispatcher.dispatchEvent(
newGroup, GroupEventDispatcher.EventType.group_created, Collections.emptyMap());
}
return newGroup;
}
}
/**
* Returns an iterator for all groups that the entity with the specified JID is a member of.
*
* @param user the JID of the entity to get a list of groups for.
* @return all groups that an entity belongs to.
*/
public Collection<Group> getGroups(JID user) {
// TODO: add caching
return provider.getGroups(user);
}
/**
* Returns an iterator for all groups according to a filter.
*
* <p>This is useful to support pagination in a GUI where you may only want to display a certain
* number of results per page. It is possible that the number of results returned will be less
* than that specified by numResults if numResults is greater than the number of records left in
* the system to display.
*
* @param startIndex start index in results.
* @param numResults number of results to return.
* @return an Iterator for all groups in the specified range.
*/
public Collection<Group> getGroups(int startIndex, int numResults) {
// TODO: add caching
return provider.getGroups(startIndex, numResults);
}
/**
* Returns the total number of groups in the system.
*
* @return the total number of groups.
*/
public int getGroupCount() {
// TODO: add caching
return provider.getGroupCount();
}
