[tracker/writeback: 20/23] Refactored content-type check to abstract TrackerWritebackFile

[Philip Van Hoof <pvanhoof src gnome org>]

commit 19124f5022de690ed6b3d81f2e55108197f2ea09
Author: Philip Van Hoof <philip codeminded be>
Date:   Tue Nov 24 12:31:44 2009 +0100

    Refactored content-type check to abstract TrackerWritebackFile

 src/tracker-writeback/tracker-writeback-file.c |   50 ++++++++++++++++---
 src/tracker-writeback/tracker-writeback-file.h |    8 ++-
 src/tracker-writeback/tracker-writeback-mp3.c  |   44 +++++++----------
 src/tracker-writeback/tracker-writeback-xmp.c  |   62 ++++++++++-------------
 4 files changed, 92 insertions(+), 72 deletions(-)
---
diff --git a/src/tracker-writeback/tracker-writeback-file.c b/src/tracker-writeback/tracker-writeback-file.c
index cae2736..5ce1ef7 100644
--- a/src/tracker-writeback/tracker-writeback-file.c
+++ b/src/tracker-writeback/tracker-writeback-file.c
@@ -64,9 +64,13 @@ tracker_writeback_file_update_metadata (TrackerWriteback *writeback,
 	TrackerWritebackFileClass *writeback_file_class;
 	gboolean retval;
 	GFile *file;
+	GFileInfo *file_info;
 	const gchar *subjects[2] = { NULL, NULL };
 	GStrv row;
 	TrackerWritebackFile *self;
+	const gchar **content_types;
+	const gchar *mime_type;
+	guint n;
 
 	writeback_file_class = TRACKER_WRITEBACK_FILE_GET_CLASS (writeback);
 	self = TRACKER_WRITEBACK_FILE (writeback);
@@ -77,22 +81,52 @@ tracker_writeback_file_update_metadata (TrackerWriteback *writeback,
 		return FALSE;
 	}
 
+	if (!writeback_file_class->content_types) {
+		g_critical ("%s doesn't implement content_types()",
+		            G_OBJECT_TYPE_NAME (writeback));
+		return FALSE;
+	}
+
 	/* Get the file from the first row */
 	row = g_ptr_array_index (values, 0);
 	file = g_file_new_for_uri (row[0]);
 
-	tracker_file_lock (file);
+	file_info = g_file_query_info (file, G_FILE_ATTRIBUTE_STANDARD_CONTENT_TYPE,
+	                               G_FILE_QUERY_INFO_NOFOLLOW_SYMLINKS,
+	                               NULL, NULL);
+
+	if (!file_info) {
+		return FALSE;
+	}
+
+	mime_type = g_file_info_get_content_type (file_info);
+	content_types = (writeback_file_class->content_types) (TRACKER_WRITEBACK_FILE (writeback));
+
+	retval = FALSE;
+
+	for (n = 0; content_types[n] != NULL; n++) {
+		if (g_strcmp0 (mime_type, content_types[n]) == 0) {
+			retval = TRUE;
+			break;
+		}
+	}
 
-	subjects[0] = row[0];
+	g_object_unref (file_info);
 
-	tracker_miner_manager_writeback (tracker_writeback_get_miner_manager (),
-	                                 "org.freedesktop.Tracker1.Miner.Files",
-	                                 subjects);
+	if (retval) {
+		tracker_file_lock (file);
 
-	retval = (writeback_file_class->update_file_metadata) (TRACKER_WRITEBACK_FILE (writeback),
-	                                                       file, values);
+		subjects[0] = row[0];
 
-	g_timeout_add_seconds (3, (GSourceFunc) unlock_file_cb, g_object_ref (file));
+		tracker_miner_manager_writeback (tracker_writeback_get_miner_manager (),
+		                                 "org.freedesktop.Tracker1.Miner.Files",
+		                                 subjects);
+
+		retval = (writeback_file_class->update_file_metadata) (TRACKER_WRITEBACK_FILE (writeback),
+		                                                       file, values);
+
+		g_timeout_add_seconds (3, (GSourceFunc) unlock_file_cb, g_object_ref (file));
+	}
 
 	g_object_unref (file);
 
diff --git a/src/tracker-writeback/tracker-writeback-file.h b/src/tracker-writeback/tracker-writeback-file.h
index c646066..140951e 100644
--- a/src/tracker-writeback/tracker-writeback-file.h
+++ b/src/tracker-writeback/tracker-writeback-file.h
@@ -44,9 +44,11 @@ struct TrackerWritebackFile {
 struct TrackerWritebackFileClass {
 	TrackerWritebackClass parent_class;
 
-	gboolean (* update_file_metadata) (TrackerWritebackFile *writeback_file,
-	                                   GFile                *file,
-	                                   GPtrArray            *values);
+	gboolean      (* update_file_metadata) (TrackerWritebackFile *writeback_file,
+	                                        GFile                *file,
+	                                        GPtrArray            *values);
+	const gchar** (* content_types)        (TrackerWritebackFile *writeback_file);
+
 };
 
 GType tracker_writeback_file_get_type (void) G_GNUC_CONST;
diff --git a/src/tracker-writeback/tracker-writeback-mp3.c b/src/tracker-writeback/tracker-writeback-mp3.c
index ee2c69c..58702c6 100644
--- a/src/tracker-writeback/tracker-writeback-mp3.c
+++ b/src/tracker-writeback/tracker-writeback-mp3.c
@@ -39,10 +39,11 @@ struct TrackerWritebackMP3Class {
 	TrackerWritebackFileClass parent_class;
 };
 
-static GType    tracker_writeback_mp3_get_type             (void) G_GNUC_CONST;
-static gboolean tracker_writeback_mp3_update_file_metadata (TrackerWritebackFile *writeback_file,
-                                                            GFile                *file,
-                                                            GPtrArray            *values);
+static GType         tracker_writeback_mp3_get_type             (void) G_GNUC_CONST;
+static gboolean      tracker_writeback_mp3_update_file_metadata (TrackerWritebackFile *writeback_file,
+                                                                 GFile                *file,
+                                                                 GPtrArray            *values);
+static const gchar** tracker_writeback_mp3_content_types        (TrackerWritebackFile *writeback_file);
 
 G_DEFINE_DYNAMIC_TYPE (TrackerWritebackMP3, tracker_writeback_mp3, TRACKER_TYPE_WRITEBACK_FILE);
 
@@ -52,6 +53,7 @@ tracker_writeback_mp3_class_init (TrackerWritebackMP3Class *klass)
 	TrackerWritebackFileClass *writeback_file_class = TRACKER_WRITEBACK_FILE_CLASS (klass);
 
 	writeback_file_class->update_file_metadata = tracker_writeback_mp3_update_file_metadata;
+	writeback_file_class->content_types = tracker_writeback_mp3_content_types;
 }
 
 static void
@@ -64,34 +66,24 @@ tracker_writeback_mp3_init (TrackerWritebackMP3 *mp3)
 {
 }
 
+static const gchar**
+tracker_writeback_mp3_content_types (TrackerWritebackFile *writeback_file)
+{
+	static const gchar *content_types[] = { "audio/mpeg", 
+	                                        "audio/x-mp3",
+	                                        NULL };
+
+	return content_types;
+}
+
 static gboolean
 tracker_writeback_mp3_update_file_metadata (TrackerWritebackFile *writeback_file,
-					    GFile                *file,
-					    GPtrArray            *values)
+                                            GFile                *file,
+                                            GPtrArray            *values)
 {
-	GFileInfo *file_info;
-	const gchar *mime_type;
 	gchar *path;
 	guint n;
 
-	file_info = g_file_query_info (file, G_FILE_ATTRIBUTE_STANDARD_CONTENT_TYPE,
-	                               G_FILE_QUERY_INFO_NOFOLLOW_SYMLINKS,
-	                               NULL, NULL);
-
-	if (!file_info) {
-		return FALSE;
-	}
-
-	mime_type = g_file_info_get_content_type (file_info);
-
-	if (g_strcmp0 (mime_type, "audio/mpeg") != 0     && /* .mp3 files */
-	    g_strcmp0 (mime_type, "audio/x-mp3") != 0) {    /* .mp3 files */
-
-		g_object_unref (file_info);
-		return FALSE;
-	}
-
-	g_object_unref (file_info);
 	path = g_file_get_path (file);
 
 	for (n = 0; n < values->len; n++) {
diff --git a/src/tracker-writeback/tracker-writeback-xmp.c b/src/tracker-writeback/tracker-writeback-xmp.c
index b2701d7..974ef0e 100644
--- a/src/tracker-writeback/tracker-writeback-xmp.c
+++ b/src/tracker-writeback/tracker-writeback-xmp.c
@@ -53,10 +53,11 @@ struct TrackerWritebackXMPClass {
 };
 
 
-static GType    tracker_writeback_xmp_get_type             (void) G_GNUC_CONST;
-static gboolean tracker_writeback_xmp_update_file_metadata (TrackerWritebackFile *writeback_file,
-                                                            GFile                *file,
-                                                            GPtrArray            *values);
+static GType         tracker_writeback_xmp_get_type             (void) G_GNUC_CONST;
+static gboolean      tracker_writeback_xmp_update_file_metadata (TrackerWritebackFile *writeback_file,
+                                                                 GFile                *file,
+                                                                 GPtrArray            *values);
+static const gchar** tracker_writeback_xmp_content_types        (TrackerWritebackFile *writeback_file);
 
 G_DEFINE_DYNAMIC_TYPE (TrackerWritebackXMP, tracker_writeback_xmp, TRACKER_TYPE_WRITEBACK_FILE);
 
@@ -67,6 +68,7 @@ tracker_writeback_xmp_class_init (TrackerWritebackXMPClass *klass)
 
 	xmp_init ();
 	writeback_file_class->update_file_metadata = tracker_writeback_xmp_update_file_metadata;
+	writeback_file_class->content_types = tracker_writeback_xmp_content_types;
 }
 
 static void
@@ -80,13 +82,32 @@ tracker_writeback_xmp_init (TrackerWritebackXMP *xmp)
 {
 }
 
+static const gchar**
+tracker_writeback_xmp_content_types (TrackerWritebackFile *writeback_file)
+{
+	static const gchar *content_types[] = { "image/png",   /* .png files */
+	                                        "sketch/png",  /* .sketch.png files on Maemo*/
+	                                        "image/jpeg",  /* .jpg & .jpeg files */
+	                                        "image/tiff",  /* .tiff & .tif files */
+	                                        NULL };
+
+	/* "image/gif"                        .gif files 
+	   "application/pdf"                  .pdf files 
+	   "application/rdf+xml"              .xmp files 
+	   "application/postscript"           .ps files  
+	   "application/x-shockwave-flash"    .swf files 
+	   "video/quicktime"                  .mov files 
+	   "video/mpeg"                       .mpeg & .mpg files 
+	   "audio/mpeg"                       .mp3, etc files */
+
+	return content_types;
+}
+
 static gboolean
 tracker_writeback_xmp_update_file_metadata (TrackerWritebackFile *writeback_file,
                                             GFile                *file,
                                             GPtrArray            *values)
 {
-	GFileInfo *file_info;
-	const gchar *mime_type;
 	gchar *path;
 	guint n;
 	XmpFilePtr xmp_files;
@@ -95,35 +116,6 @@ tracker_writeback_xmp_update_file_metadata (TrackerWritebackFile *writeback_file
 	XmpStringPtr str;
 #endif
 
-	file_info = g_file_query_info (file, G_FILE_ATTRIBUTE_STANDARD_CONTENT_TYPE,
-	                               G_FILE_QUERY_INFO_NOFOLLOW_SYMLINKS,
-	                               NULL, NULL);
-
-	if (!file_info) {
-		return FALSE;
-	}
-
-	mime_type = g_file_info_get_content_type (file_info);
-
-	if (g_strcmp0 (mime_type, "image/png") != 0                     && /* .png files */
-	    g_strcmp0 (mime_type, "sketch/png") != 0                    && /* .sketch.png files on Maemo*/
-	    g_strcmp0 (mime_type, "image/jpeg") != 0                    && /* .jpg & .jpeg files */
-	    g_strcmp0 (mime_type, "image/tiff") != 0                   ) { /* .tiff & .tif files */
-
-	/*  g_strcmp0 (mime_type, "image/gif") != 0                     && * .gif files *
-	    g_strcmp0 (mime_type, "application/pdf") != 0               && * .pdf files *
-	    g_strcmp0 (mime_type, "application/rdf+xml") != 0           && * .xmp files *
-	    g_strcmp0 (mime_type, "application/postscript") != 0        && * .ps files *
-	    g_strcmp0 (mime_type, "application/x-shockwave-flash") != 0 && * .swf files *
-	    g_strcmp0 (mime_type, "video/quicktime") != 0               && * .mov files *
-	    g_strcmp0 (mime_type, "video/mpeg") != 0                    && * .mpeg & .mpg files *
-	    g_strcmp0 (mime_type, "audio/mpeg") != 0 ) {                   * .mp3, etc files */
-
-		g_object_unref (file_info);
-		return FALSE;
-	}
-
-	g_object_unref (file_info);
 	path = g_file_get_path (file);
 
 	xmp_files = xmp_files_open_new (path, XMP_OPEN_FORUPDATE);