libmmanager/mm-hit.c

   1 /* MManager - a Desktop wide manager for multimedia applications.
   2  *
   3  * Copyright (C) 2008 Cosimo Cecchi <cosimoc@gnome.org>
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the
  17  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18  * Boston, MA 02111-1307, USA.
  19  */
  20
  21 #include <glib.h>
  22 #include <glib-object.h>
  23
  24 #include "mm-hit.h"
  25 #include "mm-attribute.h"
  26 #include "mm-utils.h"
  27
  28 #define MM_HIT_GET_PRIVATE(o) \
  29    (G_TYPE_INSTANCE_GET_PRIVATE ((o), MM_TYPE_HIT, MMHitDetails))
  30
  31 G_DEFINE_TYPE (MMHit, mm_hit, G_TYPE_OBJECT);
  32
  33 struct _MMHitDetails {
  34   GHashTable *attributes;
  35 };
  36
  37 typedef struct {
  38   MMAttribute *attr;
  39   GValue *val;
  40 } AttributeValuePair;
  41
  42 static void
  43 mm_hit_finalize (GObject *o)
  44 {
  45   MMHitDetails *details = MM_HIT (o)->details;
  46
  47   g_hash_table_destroy (details->attributes);
  48
  49   G_OBJECT_CLASS (mm_hit_parent_class)->finalize (o);
  50 }
  51
  52 static void
  53 pair_free (gpointer data)
  54 {
  55   AttributeValuePair *pair = data;
  56
  57   g_value_unset (pair->val);
  58   g_free (pair->val);
  59   g_slice_free (AttributeValuePair, data);
  60 }
  61
  62 static void
  63 mm_hit_init (MMHit *h)
  64 {
  65   MMHitDetails *details = h->details = MM_HIT_GET_PRIVATE (h);
  66
  67   details->attributes = g_hash_table_new_full (g_str_hash, g_str_equal, NULL, pair_free);
  68 }
  69
  70 static void
  71 mm_hit_class_init (MMHitClass *klass)
  72 {
  73   GObjectClass *oclass = G_OBJECT_CLASS (klass);
  74
  75   oclass->finalize = mm_hit_finalize;
  76
  77   g_type_class_add_private (klass, sizeof (MMHitDetails));
  78 }
  79
  80 static void
  81 build_all_table_foreach (gpointer k,
  82                          gpointer v,
  83                          gpointer ud)
  84 {
  85   GHashTable *table = ud;
  86   AttributeValuePair *pair = v;
  87
  88   g_hash_table_insert (table, pair->attr, pair->val);
  89 }
  90
  91 /* public methods */
  92
  93 /**
  94  * mm_hit_set_value:
  95  * @hit: a #MMHit.
  96  * @attribute: a #MMAttribute.
  97  * @value: a #GValue.
  98  *
  99  * Sets @value as value for @attribute inside the hit.
 100  */
 101
 102 void
 103 mm_hit_set_value (MMHit *hit,
 104                   MMAttribute *attribute,
 105                   GValue *value)
 106 {
 107   const char *attribute_id;
 108   AttributeValuePair *pair;
 109
 110   g_return_if_fail (MM_IS_HIT (hit));
 111
 112   if (G_VALUE_TYPE (value) != mm_attribute_get_value_type (attribute)) {
 113     g_warning ("Setting the wrong value type for attribute %s",
 114                mm_attribute_get_name (attribute));
 115     return;
 116   }
 117
 118   pair = g_slice_new0 (AttributeValuePair);
 119   pair->attr = attribute;
 120   pair->val = mm_create_gvalue_for_attribute (attribute);
 121   g_value_copy (value, pair->val);
 122
 123   attribute_id = mm_attribute_get_id (attribute);
 124   g_hash_table_insert (hit->details->attributes,
 125                        (char *) attribute_id,
 126                        pair);
 127 }
 128
 129 /**
 130  * mm_hit_set_values:
 131  * @hit: a #MMHit.
 132  * @attributes: a list of #MMAttribute<!-- -->s.
 133  * @values: a list of #GValue<!-- -->s.
 134  *
 135  * Set on the hit the values specified in @values for the attributes specified
 136  * in @attributes. The two lists should be of identical order and length.
 137  */
 138
 139 void
 140 mm_hit_set_values (MMHit *hit,
 141                    GList *attributes,
 142                    GList *values)
 143 {
 144   GList *l, *m;
 145
 146   g_return_if_fail (MM_IS_HIT (hit));
 147   g_return_if_fail (g_list_length (attributes) == g_list_length (values));
 148
 149   for (l = attributes, m = values; l && m; l = l->next, m = m->next) {
 150     mm_hit_set_value (hit, l->data, m->data);
 151   }
 152 }
 153
 154 /**
 155  * mm_hit_get_values:
 156  * @hit: a #MMHit.
 157  * @ids: a space-separated list of attribute ids.
 158  *
 159  * Similar to #mm_hit_get_all_values<!-- -->, but gets the values only
 160  * for the attributes specified by @ids. The lookup is done in a "best effort"
 161  * way, i.e. if an attribute id doesn't have a value in @hit, it won't be
 162  * there in the returned #GHashTable.
 163  *
 164  * Return value: a #GHashTable. Use #g_hash_table_destroy when done with it.
 165  */
 166
 167 GHashTable *
 168 mm_hit_get_values (MMHit      *hit,
 169                    const char *ids)
 170 {
 171   GHashTable *table;
 172   gchar **splitted_ids;
 173   int idx;
 174   AttributeValuePair *pair;
 175
 176   g_return_val_if_fail (MM_IS_HIT (hit), NULL);
 177   table = g_hash_table_new (g_direct_hash, g_direct_equal);
 178
 179   splitted_ids = g_strsplit (ids, " ", 0);
 180   for (idx = 0; idx < G_N_ELEMENTS (splitted_ids); idx++) {
 181     pair = g_hash_table_lookup (hit->details->attributes,
 182                                 splitted_ids[idx]);
 183     if (!pair) {
 184       /* we can't find the relevant attribute, keep looking for the
 185        * others.
 186        */
 187       continue;
 188     }
 189     g_hash_table_insert (table, pair->attr, pair->val);
 190   }
 191
 192   g_strfreev (splitted_ids);
 193
 194   return table;
 195 }
 196
 197 /**
 198  * mm_hit_get_all_values:
 199  * @hit: a #MMHit.
 200  *
 201  * Gets all the attributes and the relevant values set to the hit, organized
 202  * in a #GHashTable, where the keys are #MMAttribute structures and the values
 203  * are #GValue<!-- -->s. This works, as #MMAttribute structures are
 204  * always static.
 205  *
 206  * Return value: a #GHashTable. Use #g_hash_table_destroy when done with it.
 207  */
 208
 209 GHashTable *
 210 mm_hit_get_all_values (MMHit *hit)
 211 {
 212   GHashTable *table;
 213
 214   g_return_val_if_fail (MM_IS_HIT (hit), NULL);
 215
 216   table = g_hash_table_new (g_direct_hash, g_direct_equal);
 217
 218   g_hash_table_foreach (hit->details->attributes,
 219                         build_all_table_foreach,
 220                         table);
 221   return table;
 222 }