Use statically known types, use hash for formats
[babeltrace.git] / formats / registry.c
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1/*
2 * BabelTrace
3 *
4 * Format Registry
5 *
6 * Copyright (c) 2010 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
7 *
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with this library; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23#include <glib.h>
24#include <errno.h>
25
26static int init_done;
27void __attribute__((constructor)) format_init(void);
28void __attribute__((destructor)) format_finalize(void);
29
30/*
31 * Format registry hash table contains the registered formats. Format
32 * registration is typically performed by a format plugin.
33 * TODO: support plugin unload (unregistration of formats).
34 */
35GHashTable *format_registry;
36
37struct format *bt_lookup_format(GQuark qname)
38{
39 if (!init_done)
40 return NULL;
41 return g_hash_table_lookup(format_registry,
42 (gconstpointer) (unsigned long) qname)
43}
44
45int bt_register_format(const struct format *format)
46{
47 if (!init_done)
48 format_init();
49
50 if (bt_lookup_format(qname))
51 return -EEXIST;
52
53 g_hash_table_insert(format_registry,
54 (gconstpointer) (unsigned long) format->name,
55 format);
56 return 0;
57}
58
59void format_init(void)
60{
61 format_registry = g_hash_table_new(g_direct_hash, g_direct_equal);
62 assert(format_registry);
63 init_done = 1;
64}
65
66int format_finalize(void)
67{
68 g_hash_table_destroy(format_registry);
69}
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