[grilo] [core] Added grl_multiple_search API.

[Iago Toral Quiroga <itoral src gnome org>]

commit a40860c02ce4b1dd963346bca1a5a9d9df46f311
Author: Iago Toral Quiroga <itoral igalia com>
Date:   Tue Jun 1 16:46:34 2010 +0200

    [core] Added grl_multiple_search API.

 src/Makefile.am    |    4 +-
 src/grilo.h        |    1 +
 src/grl-multiple.c |  157 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/grl-multiple.h |   42 ++++++++++++++
 4 files changed, 203 insertions(+), 1 deletions(-)
---
diff --git a/src/Makefile.am b/src/Makefile.am
index 9287c03..f105141 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -24,6 +24,7 @@ lib GRL_NAME@_la_SOURCES =					\
 	grl-metadata-key.c grl-metadata-key-priv.h		\
 	grl-metadata-source.c grl-metadata-source-priv.h	\
 	grl-media-source.c grl-media-source-priv.h		\
+	grl-multiple.c						\
 	grl-log.c						\
 	grilo.c
 
@@ -49,7 +50,8 @@ lib GRL_NAME@inc_HEADERS =	\
 	grl-metadata-key.h	\
 	grl-metadata-source.h	\
 	grl-media-source.h	\
-	grl-log.h
+	grl-log.h 		\
+	grl-multiple.h
 
 data_h_headers =		\
 	data/grl-data.h		\
diff --git a/src/grilo.h b/src/grilo.h
index 9380cf2..ca4c358 100644
--- a/src/grilo.h
+++ b/src/grilo.h
@@ -45,6 +45,7 @@
 #include <grl-media-image.h>
 #include <grl-media-box.h>
 #include <grl-config.h>
+#include <grl-multiple.h>
 
 #undef _GRILO_H_INSIDE_
 
diff --git a/src/grl-multiple.c b/src/grl-multiple.c
new file mode 100644
index 0000000..92a914e
--- /dev/null
+++ b/src/grl-multiple.c
@@ -0,0 +1,157 @@
+/*
+ * Copyright (C) 2010 Igalia S.L.
+ *
+ * Contact: Iago Toral Quiroga <itoral igalia com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * as published by the Free Software Foundation; version 2.1 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ */
+
+#include "grl-multiple.h"
+#include "grl-plugin-registry.h"
+#include "grl-media-source-priv.h"
+
+#undef G_LOG_DOMAIN
+#define G_LOG_DOMAIN "grl-multiple"
+
+struct MultipleSearchData {
+  GHashTable *table;
+  guint remaining;
+  GList *search_ids;
+  guint search_id;
+  GrlMediaSourceResultCb user_callback;
+  gpointer user_data;
+};
+
+static void
+multiple_search_cb (GrlMediaSource *source,
+		    guint search_id,
+		    GrlMedia *media,
+		    guint remaining,
+		    gpointer user_data,
+		    const GError *error)
+{
+  g_debug ("multiple_search_cb");
+
+  struct MultipleSearchData *msd = (struct MultipleSearchData *) user_data;
+  guint source_remaining;
+  guint diff;
+
+  g_debug ("multiple:remaining == %u, source:remaining = %u (%s)",
+	     msd->remaining, remaining,
+	     grl_metadata_source_get_name (GRL_METADATA_SOURCE (source)));
+
+  source_remaining = GPOINTER_TO_INT (g_hash_table_lookup (msd->table,
+							   (gpointer) source));
+  if (remaining != -1) {
+    diff = source_remaining - remaining;
+    g_hash_table_insert (msd->table, source, GINT_TO_POINTER (remaining - 1));
+  } else {
+    diff = 0;
+    g_hash_table_insert (msd->table, source, GINT_TO_POINTER (source_remaining - 1));
+  }
+  
+  msd->remaining -= diff;
+
+  msd->user_callback (source,
+		      msd->search_id,
+		      media,
+		      msd->remaining,
+		      msd->user_data,
+		      NULL);
+  
+  if (msd->remaining == 0) {
+    g_debug ("Multiple operation finished (%u)", msd->search_id);
+    g_hash_table_unref (msd->table);
+    g_free (msd);
+  } else {
+    msd->remaining--;
+  }
+}
+
+guint
+grl_multiple_search (const gchar *text,
+		     const GList *keys,
+		     guint count,
+		     GrlMetadataResolutionFlags flags,
+		     GrlMediaSourceResultCb callback,
+		     gpointer user_data)
+{
+  GrlPluginRegistry *registry;
+  GrlMediaPlugin **sources;
+  guint individual_count, first_count, source_count;
+  guint search_id, n;
+  struct MultipleSearchData *msd;
+
+  g_debug ("grl_multiple_search");
+
+  registry = grl_plugin_registry_get_instance ();
+  sources = grl_plugin_registry_get_sources_by_operations (registry,
+							   GRL_OP_SEARCH,
+							   TRUE);
+
+  /* TODO: handle this properly */
+  if (sources[0] == NULL) {
+    g_free (sources);
+    callback (NULL, 0, NULL, 0, user_data, NULL);
+    return 0;
+  }
+
+  /* Prepare operation */
+  for (n = 0; sources[n] != NULL; n++);
+  individual_count = count / n;
+  first_count = individual_count + count % n;
+  source_count = n;
+
+  msd = g_new0 (struct MultipleSearchData, 1);
+  msd->table = g_hash_table_new (g_direct_hash, g_direct_equal);
+  msd->remaining = count - 1;
+  msd->user_callback = callback;
+  msd->user_data = user_data;
+    
+  /* Execute multiple search */
+  for (n = 0; sources[n]; n++) {
+    GrlMediaSource *source;
+    guint c, id;
+
+    source = GRL_MEDIA_SOURCE (sources[n]);
+
+    if (n == 0) {
+      c = first_count; 
+      msd->search_id = grl_media_source_gen_browse_id (source);
+    } else {
+      c = individual_count;
+    }
+
+    if (c > 0) {
+      g_hash_table_insert (msd->table, source, GINT_TO_POINTER (c - 1));
+      id = grl_media_source_search (source,
+				    text,
+				    keys,
+				    0, c,
+				    flags,
+				    multiple_search_cb,
+				    msd);
+      g_debug ("Operation %u: Searching %u items in %s",
+	       id, c, grl_metadata_source_get_name (GRL_METADATA_SOURCE (source)));
+      msd->search_ids = g_list_prepend (msd->search_ids, GINT_TO_POINTER (id));
+    }
+  }
+
+  g_free (sources);
+
+  return msd->search_id;
+}
diff --git a/src/grl-multiple.h b/src/grl-multiple.h
new file mode 100644
index 0000000..f6842f1
--- /dev/null
+++ b/src/grl-multiple.h
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2010 Igalia S.L.
+ *
+ * Contact: Iago Toral Quiroga <itoral igalia com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * as published by the Free Software Foundation; version 2.1 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ */
+
+#if !defined (_GRILO_H_INSIDE_) && !defined (GRILO_COMPILATION)
+#error "Only <grilo.h> can be included directly."
+#endif
+
+#ifndef _GRL_MULTIPLE_H_
+#define _GRL_MULTIPLE_H_
+
+#include <glib.h>
+
+#include "grl-media-source.h"
+
+guint grl_multiple_search (const gchar *text,
+			   const GList *keys,
+			   guint count,
+			   GrlMetadataResolutionFlags flags,
+			   GrlMediaSourceResultCb callback,
+			   gpointer user_data);
+
+
+#endif