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QDict: Introduce new iteration API

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It's composed of functions qdict_first() and qdict_next(), plus
functions to access QDictEntry values.

This API was suggested by Markus Armbruster <armbru@redhat.com> and
it offers full control over the iteration process.

The usage is simple, the following example prints all keys in 'qdict'
(it's hopefully better than any English description):

   QDict *qdict;
   const QDictEntry *ent;

   [...]

   for (ent = qdict_first(qdict); ent; ent = qdict_next(qdict, ent)) {
        printf("%s ", qdict_entry_key(ent));
    }

Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
This commit is contained in:
Luiz Capitulino 2010-06-07 16:07:29 -03:00
parent 0d078b2ade
commit f2b07f35d2
2 changed files with 39 additions and 0 deletions
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37
qdict.c
View File

@ -345,6 +345,43 @@ void qdict_iter(const QDict *qdict,
}
}
static QDictEntry *qdict_next_entry(const QDict *qdict, int first_bucket)
{
int i;
for (i = first_bucket; i < QDICT_BUCKET_MAX; i++) {
if (!QLIST_EMPTY(&qdict->table[i])) {
return QLIST_FIRST(&qdict->table[i]);
}
}
return NULL;
}
/**
* qdict_first(): Return first qdict entry for iteration.
*/
const QDictEntry *qdict_first(const QDict *qdict)
{
return qdict_next_entry(qdict, 0);
}
/**
* qdict_next(): Return next qdict entry in an iteration.
*/
const QDictEntry *qdict_next(const QDict *qdict, const QDictEntry *entry)
{
QDictEntry *ret;
ret = QLIST_NEXT(entry, next);
if (!ret) {
unsigned int bucket = tdb_hash(entry->key) % QDICT_BUCKET_MAX;
ret = qdict_next_entry(qdict, bucket + 1);
}
return ret;
}
/**
* qentry_destroy(): Free all the memory allocated by a QDictEntry
*/

2
qdict.h
View File

@ -45,6 +45,8 @@ QDict *qobject_to_qdict(const QObject *obj);
void qdict_iter(const QDict *qdict,
void (*iter)(const char *key, QObject *obj, void *opaque),
void *opaque);
const QDictEntry *qdict_first(const QDict *qdict);
const QDictEntry *qdict_next(const QDict *qdict, const QDictEntry *entry);
/* Helper to qdict_put_obj(), accepts any object */
#define qdict_put(qdict, key, obj) \