/* parasitelist.c: Copyright 1998 Jay Cox <jaycox@earthlink.net>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#include "gimpobjectP.h"
#include "gimpobject.h"
#include "gimpsignal.h"
#include "parasitelistP.h"
#include "libgimp/parasite.h"
#include "libgimp/parasiteP.h"

enum
{
  ADD,
  REMOVE,
  LAST_SIGNAL
};

static guint parasite_list_signals[LAST_SIGNAL];

static void parasite_list_destroy    (GtkObject* list);
static void parasite_list_init       (ParasiteList* list);
static void parasite_list_class_init (ParasiteListClass *klass);
static int  parasite_compare_func    (gconstpointer n1, gconstpointer n2);
static int  free_a_parasite          (void *key, void *parasite, void *unused);

static void
parasite_list_init (ParasiteList* list)
{
  list->table=NULL;
}

static void
parasite_list_class_init(ParasiteListClass *klass)
{
  GtkObjectClass *class = GTK_OBJECT_CLASS(klass);
  GtkType type = class->type;

  class->destroy = parasite_list_destroy;

  parasite_list_signals[ADD] =
    gimp_signal_new("add",    GTK_RUN_FIRST, type, 0, gimp_sigtype_pointer);
  parasite_list_signals[REMOVE] = 
    gimp_signal_new("remove", GTK_RUN_FIRST, type, 0, gimp_sigtype_pointer);
  gtk_object_class_add_signals (class, parasite_list_signals, LAST_SIGNAL);
}

GtkType
parasite_list_get_type()
{
  static GtkType type = 0;
  if (!type)
  {
    GtkTypeInfo info =
    {
      "ParasiteList",
      sizeof (ParasiteList),
      sizeof (ParasiteListClass),
      (GtkClassInitFunc) parasite_list_class_init,
      (GtkObjectInitFunc) parasite_list_init,
      NULL,
      NULL,
      (GtkClassInitFunc) NULL
    };
    type = gtk_type_unique(GIMP_TYPE_OBJECT, &info);
  }
  return type;
}

ParasiteList*
parasite_list_new()
{
  ParasiteList *list = gtk_type_new(GIMP_TYPE_PARASITE_LIST);
  list->table = NULL;
  return list;
}

static int
parasite_compare_func(gconstpointer n1, gconstpointer n2)
{
  return (!strcmp((char*)n1, (char*)n2));
}

static int
free_a_parasite(void *key, void *parasite, void *unused)
{
  parasite_free((Parasite *)parasite);
  return TRUE;
}

static void
parasite_list_destroy(GtkObject *obj)
{
  ParasiteList *list;

  g_return_if_fail(obj != NULL);
  g_return_if_fail(GIMP_IS_PARASITE_LIST(obj));

  list = (ParasiteList *)obj;

  if (list->table)
  {
    g_hash_table_foreach_remove(list->table, free_a_parasite, NULL);
    g_hash_table_destroy(list->table);
  }
}

static void
parasite_copy_one(void *key, void *p, void *data)
{
  ParasiteList *list = (ParasiteList*)data;
  Parasite *parasite = (Parasite*)p;
  parasite_list_add(list, parasite);
}

ParasiteList*
parasite_list_copy(const ParasiteList *list)
{
  ParasiteList *newlist;
  newlist = parasite_list_new();
  if (list->table)
    g_hash_table_foreach(list->table, parasite_copy_one, newlist);
  return newlist;
}

void
parasite_list_add(ParasiteList *list, Parasite *p)
{
  g_return_if_fail(list != NULL);
  if (list->table == NULL)
    list->table = g_hash_table_new(g_str_hash, parasite_compare_func);
  g_return_if_fail(p != NULL);
  g_return_if_fail(p->name != NULL);
  p = parasite_copy(p);
  g_hash_table_insert(list->table, p->name, p);
  gtk_signal_emit (GTK_OBJECT(list), parasite_list_signals[ADD], p);
}

void
parasite_list_remove(ParasiteList *list, const char *name)
{
  Parasite *p;
  g_return_if_fail(list != NULL);
  if (list->table)
  {
    p = parasite_list_find(list, name);
    if (p)
    {
      g_hash_table_remove(list->table, name);
      gtk_signal_emit (GTK_OBJECT(list), parasite_list_signals[REMOVE], p);
      parasite_free(p);
    }
  }
}

Parasite *
parasite_list_find(ParasiteList *list, const char *name)
{
  g_return_val_if_fail(list != NULL, NULL);
  if (list->table)
    return (Parasite *)g_hash_table_lookup(list->table, name);
  else
    return NULL;
}