glib/gdataset.c

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/* GLIB - Library of useful routines for C programming
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* gdataset.c: Generic dataset mechanism, similar to GtkObject data.
* Copyright (C) 1998 Tim Janik
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
*/
#include <string.h>
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#include "glib.h"
/* --- defines --- */
#define G_DATASET_BLOCK_SIZE (512)
#define G_DATASET_MEM_CHUNK_PREALLOC (64)
#define G_DATASET_DATA_MEM_CHUNK_PREALLOC (128)
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/* --- structures --- */
typedef struct _GDatasetData GDatasetData;
typedef struct _GDataset GDataset;
struct _GDatasetData
{
GDatasetData *next;
guint id;
gpointer data;
GDestroyNotify destroy_func;
};
struct _GDataset
{
gconstpointer location;
GDatasetData *data_list;
};
/* --- prototypes --- */
static inline GDataset* g_dataset_lookup (gconstpointer dataset_location);
static inline void g_dataset_destroy_i (GDataset *dataset);
static void g_dataset_initialize (void);
static inline GQuark g_quark_new (const gchar *string);
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/* --- variables --- */
static GHashTable *g_quark_ht = NULL;
static gchar **g_quarks = NULL;
static GQuark g_quark_seq_id = 0;
static GHashTable *g_dataset_location_ht = NULL;
static GDataset *g_dataset_cached = NULL;
static GMemChunk *g_dataset_mem_chunk = NULL;
static GMemChunk *g_dataset_data_mem_chunk = NULL;
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/* --- functions --- */
static inline GDataset*
g_dataset_lookup (gconstpointer dataset_location)
{
register GDataset *dataset;
if (g_dataset_cached && g_dataset_cached->location == dataset_location)
return g_dataset_cached;
if (!g_dataset_location_ht)
g_dataset_initialize ();
dataset = g_hash_table_lookup (g_dataset_location_ht, dataset_location);
if (dataset)
g_dataset_cached = dataset;
return dataset;
}
static inline void
g_dataset_destroy_i (GDataset *dataset)
{
register GDatasetData *list;
if (dataset == g_dataset_cached)
g_dataset_cached = NULL;
g_hash_table_remove (g_dataset_location_ht, dataset->location);
list = dataset->data_list;
g_mem_chunk_free (g_dataset_mem_chunk, dataset);
while (list)
{
register GDatasetData *prev;
prev = list;
list = prev->next;
if (prev->destroy_func)
prev->destroy_func (prev->data);
g_mem_chunk_free (g_dataset_data_mem_chunk, prev);
}
}
void
g_dataset_destroy (gconstpointer dataset_location)
{
register GDataset *dataset;
g_return_if_fail (dataset_location != NULL);
dataset = g_dataset_lookup (dataset_location);
if (dataset)
g_dataset_destroy_i (dataset);
}
void
g_dataset_id_set_destroy (gconstpointer dataset_location,
GQuark key_id,
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GDestroyNotify destroy_func)
{
g_return_if_fail (dataset_location != NULL);
if (key_id)
{
register GDataset *dataset;
dataset = g_dataset_lookup (dataset_location);
if (dataset)
{
register GDatasetData *list;
list = dataset->data_list;
while (list)
{
if (list->id == key_id)
{
list->destroy_func = destroy_func;
return;
}
}
}
}
}
gpointer
g_dataset_id_get_data (gconstpointer dataset_location,
GQuark key_id)
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{
g_return_val_if_fail (dataset_location != NULL, NULL);
if (key_id)
{
register GDataset *dataset;
dataset = g_dataset_lookup (dataset_location);
if (dataset)
{
register GDatasetData *list;
for (list = dataset->data_list; list; list = list->next)
if (list->id == key_id)
return list->data;
}
}
return NULL;
}
void
g_dataset_id_set_data_full (gconstpointer dataset_location,
GQuark key_id,
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gpointer data,
GDestroyNotify destroy_func)
{
register GDataset *dataset;
register GDatasetData *list;
g_return_if_fail (dataset_location != NULL);
g_return_if_fail (key_id > 0);
dataset = g_dataset_lookup (dataset_location);
if (!dataset)
{
dataset = g_chunk_new (GDataset, g_dataset_mem_chunk);
dataset->location = dataset_location;
dataset->data_list = NULL;
g_hash_table_insert (g_dataset_location_ht,
(gpointer) dataset->location, /* Yuck */
dataset);
}
list = dataset->data_list;
if (!data)
{
register GDatasetData *prev;
prev = NULL;
while (list)
{
if (list->id == key_id)
{
if (prev)
prev->next = list->next;
else
{
dataset->data_list = list->next;
if (!dataset->data_list)
g_dataset_destroy_i (dataset);
}
/* we need to have unlinked before invoking the destroy function
*/
if (list->destroy_func)
list->destroy_func (list->data);
g_mem_chunk_free (g_dataset_data_mem_chunk, list);
return;
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}
prev = list;
list = list->next;
}
}
else
{
while (list)
{
if (list->id == key_id)
{
register GDestroyNotify dfunc;
register gpointer ddata;
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dfunc = list->destroy_func;
ddata = list->data;
list->data = data;
list->destroy_func = destroy_func;
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/* we need to have updated all structures prior to
* invokation of the destroy function
*/
if (dfunc)
dfunc (ddata);
return;
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}
list = list->next;
}
list = g_chunk_new (GDatasetData, g_dataset_data_mem_chunk);
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list->next = dataset->data_list;
list->id = key_id;
list->data = data;
list->destroy_func = destroy_func;
dataset->data_list = list;
}
}
static void
g_dataset_initialize (void)
{
if (!g_dataset_location_ht)
{
g_quark_ht = g_hash_table_new (g_str_hash, g_str_equal);
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g_dataset_location_ht = g_hash_table_new (g_direct_hash, NULL);
g_dataset_cached = NULL;
g_dataset_mem_chunk =
g_mem_chunk_new ("GDataset MemChunk",
sizeof (GDataset),
sizeof (GDataset) * G_DATASET_MEM_CHUNK_PREALLOC,
G_ALLOC_AND_FREE);
g_dataset_data_mem_chunk =
g_mem_chunk_new ("GDatasetData MemChunk",
sizeof (GDatasetData),
sizeof (GDatasetData) * G_DATASET_DATA_MEM_CHUNK_PREALLOC,
G_ALLOC_AND_FREE);
}
}
GQuark
g_quark_try_string (const gchar *string)
{
g_return_val_if_fail (string != NULL, 0);
if (g_quark_ht)
return (gulong) g_hash_table_lookup (g_quark_ht, string);
else
return 0;
}
GQuark
g_quark_from_string (const gchar *string)
{
GQuark quark;
g_return_val_if_fail (string != NULL, 0);
if (!g_quark_ht)
g_dataset_initialize ();
quark = (gulong) g_hash_table_lookup (g_quark_ht, string);
if (!quark)
quark = g_quark_new (g_strdup (string));
return quark;
}
GQuark
g_quark_from_static_string (const gchar *string)
{
GQuark quark;
g_return_val_if_fail (string != NULL, 0);
if (!g_quark_ht)
g_dataset_initialize ();
quark = (gulong) g_hash_table_lookup (g_quark_ht, string);
if (!quark)
quark = g_quark_new (string);
return quark;
}
gchar*
g_quark_to_string (GQuark quark)
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{
if (quark > 0 && quark <= g_quark_seq_id)
return g_quarks[quark - 1];
else
return NULL;
}
static inline GQuark
g_quark_new (const gchar *string)
{
GQuark quark;
if (g_quark_seq_id % G_DATASET_BLOCK_SIZE == 0)
g_quarks = g_realloc (g_quarks,
(g_quark_seq_id + G_DATASET_BLOCK_SIZE) * sizeof (gchar*));
g_quarks[g_quark_seq_id] = (gchar*) string;
g_quark_seq_id++;
quark = g_quark_seq_id;
g_hash_table_insert (g_quark_ht, (gchar*) string, GUINT_TO_POINTER (quark));
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return quark;
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}