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/*
* handle-set.c - a set which refs a handle when inserted
*
* Copyright (C) 2005,2006,2007 Collabora Ltd.
* Copyright (C) 2005,2006,2007 Nokia Corporation
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
*/
/* there is no handle-set.h - handle set and handle repo have a circular
* dependency, so they share a header */
#include <telepathy-glib/handle-repo.h>
#include <glib.h>
#include <telepathy-glib/intset.h>
/**
* TpHandleSet:
*
* A set of handles. This is similar to a #TpIntset (and implemented using
* one), but adding a handle to the set also references it.
*/
struct _TpHandleSet
{
TpHandleRepoIface *repo;
TpIntset *intset;
};
/**
* TP_TYPE_HANDLE_SET: (skip)
*
* The boxed type of a #TpHandleSet.
*
* Since: 0.11.6
*/
GType
tp_handle_set_get_type (void)
{
static GType type = 0;
if (G_UNLIKELY (type == 0))
{
type = g_boxed_type_register_static (
g_intern_static_string ("TpHandleSet"),
(GBoxedCopyFunc) tp_handle_set_copy,
(GBoxedFreeFunc) tp_handle_set_destroy);
}
return type;
}
/**
* tp_handle_set_new: (skip)
* @repo: #TpHandleRepoIface that holds the handles to be reffed by this set
*
* Creates a new #TpHandleSet
*
* Returns: A new #TpHandleSet
*/
TpHandleSet *
tp_handle_set_new (TpHandleRepoIface *repo)
{
TpHandleSet *set;
g_assert (repo != NULL);
set = g_slice_new0 (TpHandleSet);
set->intset = tp_intset_new ();
set->repo = repo;
return set;
}
/**
* tp_handle_set_new_from_array: (skip)
* @repo: #TpHandleRepoIface that holds the handles to be reffed by this set
* @array: (element-type uint): array of handles to be referenced by this set
*
* Creates a new #TpHandleSet
*
* Returns: A new #TpHandleSet
*
* Since: 0.11.7
*/
TpHandleSet *
tp_handle_set_new_from_array (TpHandleRepoIface *repo,
const GArray *array)
{
TpHandleSet *set = tp_handle_set_new (repo);
TpIntset *tmp = tp_intset_from_array (array);
tp_intset_destroy (tp_handle_set_update (set, tmp));
tp_intset_destroy (tmp);
return set;
}
static void
freer (TpHandleSet *set, TpHandle handle, gpointer userdata)
{
tp_handle_set_remove (set, handle);
}
/**
* tp_handle_set_destroy: (skip)
* @set:#TpHandleSet to destroy
*
* Delete a #TpHandleSet and unreference any handles that it holds
*/
void
tp_handle_set_destroy (TpHandleSet *set)
{
tp_handle_set_foreach (set, freer, NULL);
tp_intset_destroy (set->intset);
g_slice_free (TpHandleSet, set);
}
/**
* tp_handle_set_clear: (skip)
* @set:#TpHandleSet to clear
*
* Remove every handle from @set, releasing the references it holds.
*
* Since: 0.11.6
*/
void
tp_handle_set_clear (TpHandleSet *set)
{
tp_handle_set_foreach (set, freer, NULL);
g_assert (tp_handle_set_is_empty (set));
}
/**
* tp_handle_set_is_empty: (skip)
* @set:#TpHandleSet to check
*
* Return the same thing as <code>(tp_handle_set_size (set) == 0)</code>,
* but calculated more efficiently.
*
* Returns: %TRUE if the set has no members
*
* Since: 0.11.6
*/
gboolean
tp_handle_set_is_empty (const TpHandleSet *set)
{
return tp_intset_is_empty (set->intset);
}
/**
* tp_handle_set_peek: (skip)
* @set:#TpHandleSet to peek at
*
* <!--Returns: says it all, this comment is just to keep gtkdoc happy-->
*
* Returns: (transfer none): the underlying #TpIntset used by this #TpHandleSet
*/
TpIntset *
tp_handle_set_peek (TpHandleSet *set)
{
return set->intset;
}
/**
* tp_handle_set_add: (skip)
* @set: #TpHandleSet to add this handle to
* @handle: handle to add
*
* Add a handle to a #TpHandleSet, and reference it in the attached
* #TpHandleRepoIface
*
*/
void
tp_handle_set_add (TpHandleSet *set, TpHandle handle)
{
g_return_if_fail (set != NULL);
g_return_if_fail (handle != 0);
if (!tp_intset_is_member (set->intset, handle))
{
tp_handle_ref (set->repo, handle);
tp_intset_add (set->intset, handle);
}
}
/**
* tp_handle_set_remove: (skip)
* @set: #TpHandleSet to remove this handle from
* @handle: handle to remove
*
* Remove a handle from a #TpHandleSet, and unreference it in the attached
* #TpHandleRepoIface
*
* Returns: FALSE if the handle was invalid, or was not in this set
*/
gboolean
tp_handle_set_remove (TpHandleSet *set, TpHandle handle)
{
g_return_val_if_fail (set != NULL, FALSE);
g_return_val_if_fail (handle != 0, FALSE);
if (tp_intset_is_member (set->intset, handle))
{
tp_handle_unref (set->repo, handle);
tp_intset_remove (set->intset, handle);
return TRUE;
}
return FALSE;
}
/**
* tp_handle_set_is_member: (skip)
* @set: A #TpHandleSet
* @handle: handle to check
*
* Check if the handle is in this set
*
* Returns: TRUE if the handle is in this set
*
*/
gboolean
tp_handle_set_is_member (const TpHandleSet *set,
TpHandle handle)
{
return tp_intset_is_member (set->intset, handle);
}
typedef struct __foreach_data
{
TpHandleSet *set;
TpHandleSetMemberFunc func;
gpointer userdata;
} _foreach_data;
static void
foreach_helper (guint i, gpointer userdata)
{
_foreach_data *data = userdata;
data->func (data->set, i, data->userdata);
}
/**
* TpHandleSetMemberFunc: (skip)
* @set: The set of handles on which tp_handle_set_foreach() was called
* @handle: A handle in the set
* @userdata: Arbitrary user data as supplied to tp_handle_set_foreach()
*
* Signature of the callback used to iterate over the handle set in
* tp_handle_set_foreach().
*/
/**
* tp_handle_set_foreach: (skip)
* @set: A set of handles
* @func: (scope call): A callback
* @userdata: (closure): Arbitrary data to pass to @func
*
* Call @func(@set, @handle, @userdata) for each handle in @set.
*/
void
tp_handle_set_foreach (TpHandleSet *set, TpHandleSetMemberFunc func,
gpointer userdata)
{
_foreach_data data = {set, func, userdata};
data.set = set;
data.func = func;
data.userdata = userdata;
tp_intset_foreach (set->intset, foreach_helper, &data);
}
/**
* tp_handle_set_size: (skip)
* @set: A set of handles
*
* <!--no further documentation needed-->
*
* Returns: the number of handles in this set
*/
int
tp_handle_set_size (const TpHandleSet *set)
{
return tp_intset_size (set->intset);
}
/**
* tp_handle_set_to_array: (skip)
* @set: A handle set
*
* <!--Returns: says it all, this comment is just to keep gtkdoc happy-->
*
* Returns: (element-type uint): a newly-allocated GArray of guint representing
* the handles in the set
*/
GArray *
tp_handle_set_to_array (const TpHandleSet *set)
{
g_return_val_if_fail (set != NULL, NULL);
return tp_intset_to_array (set->intset);
}
static void
ref_one (guint handle, gpointer data)
{
TpHandleSet *set = (TpHandleSet *) data;
tp_handle_ref (set->repo, handle);
}
/**
* tp_handle_set_copy: (skip)
* @other: another handle set
*
* Creates a new #TpHandleSet with the same contents as @other.
*
* Returns: a new set
*
* Since: 0.11.6
*/
TpHandleSet *
tp_handle_set_copy (const TpHandleSet *other)
{
TpHandleSet *set;
g_return_val_if_fail (other != NULL, NULL);
set = g_slice_new0 (TpHandleSet);
set->repo = other->repo;
set->intset = tp_intset_copy (other->intset);
tp_intset_foreach (set->intset, ref_one, set);
return set;
}
/**
* tp_handle_set_update: (skip)
* @set: a #TpHandleSet to update
* @add: a #TpIntset of handles to add
*
* Add a set of handles to a handle set, referencing those which are not
* already members. The TpIntset returned must be freed with tp_intset_destroy.
*
* Returns: the handles which were added (some subset of @add)
*/
TpIntset *
tp_handle_set_update (TpHandleSet *set, const TpIntset *add)
{
TpIntset *ret, *tmp;
g_return_val_if_fail (set != NULL, NULL);
g_return_val_if_fail (add != NULL, NULL);
/* reference each of ADD - CURRENT */
ret = tp_intset_difference (add, set->intset);
tp_intset_foreach (ret, ref_one, set);
/* update CURRENT to be the union of CURRENT and ADD */
tmp = tp_intset_union (add, set->intset);
tp_intset_destroy (set->intset);
set->intset = tmp;
return ret;
}
static void
unref_one (guint handle, gpointer data)
{
TpHandleSet *set = (TpHandleSet *) data;
tp_handle_unref (set->repo, handle);
}
/**
* tp_handle_set_difference_update: (skip)
* @set: a #TpHandleSet to update
* @remove: a #TpIntset of handles to remove
*
* Remove a set of handles from a handle set, dereferencing those which are
* members. The TpIntset returned must be freed with tp_intset_destroy.
*
* If you want to be able to inspect the handles in the set returned,
* you must ensure that this function does not cause their refcount to drop
* to zero, for instance by temporarily taking a reference to all the
* handles in @remove, calling this function, doing something with the
* result and discarding the temporary references.
*
* Returns: the handles which were dereferenced and removed (some subset
* of @remove).
*/
TpIntset *
tp_handle_set_difference_update (TpHandleSet *set, const TpIntset *remove)
{
TpIntset *ret, *tmp;
g_return_val_if_fail (set != NULL, NULL);
g_return_val_if_fail (remove != NULL, NULL);
/* dereference each of REMOVE n CURRENT */
ret = tp_intset_intersection (remove, set->intset);
tp_intset_foreach (ret, unref_one, set);
/* update CURRENT to be CURRENT - REMOVE */
tmp = tp_intset_difference (set->intset, remove);
tp_intset_destroy (set->intset);
set->intset = tmp;
return ret;
}
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