[evolution-data-server/openismus-work] Report shallow vcards with only the UID if the UID field is the only 'requested_field'

[Tristan Van Berkom <tvb src gnome org>]

commit 1b7e19c4c6c85962357c8f1060466c9ad4fc3363
Author: Tristan Van Berkom <tristan van berkom gmail com>
Date:   Sun Jun 12 16:45:48 2011 +0900

    Report shallow vcards with only the UID if the UID field is the only 'requested_field'
    
    This is an initial implementation and could be optimized, currently we
    loop through and fetch the data from the db in the same way and then
    decide to construct a vcard from the id string.

 addressbook/backends/file/e-book-backend-file.c |   48 ++++++++++++++++++++---
 1 files changed, 42 insertions(+), 6 deletions(-)
---
diff --git a/addressbook/backends/file/e-book-backend-file.c b/addressbook/backends/file/e-book-backend-file.c
index 1b7c7d7..af759f7 100644
--- a/addressbook/backends/file/e-book-backend-file.c
+++ b/addressbook/backends/file/e-book-backend-file.c
@@ -539,6 +539,36 @@ get_closure (EDataBookView *book_view)
 	return g_object_get_data (G_OBJECT (book_view), "EBookBackendFile.BookView::closure");
 }
 
+static void
+notify_update_vcard (EDataBookView *book_view,
+		     gboolean       uid_only,
+		     gboolean       prefiltered,
+		     const gchar   *id,
+		     const gchar   *vcard)
+{
+	gchar *final_vcard;
+
+	if (uid_only) {
+		/* Create a shallow version of the contacts for views that are
+		 * only interested in the uid. */
+		EContact *shallow = e_contact_new ();
+
+		e_contact_set (shallow, E_CONTACT_UID, id);
+		final_vcard = e_vcard_to_string (E_VCARD (shallow), EVC_FORMAT_VCARD_30);
+		g_object_unref (shallow);
+	} else {
+		final_vcard = (gchar *)vcard;
+	}
+
+	if (prefiltered)
+		e_data_book_view_notify_update_prefiltered_vcard (book_view, id, final_vcard);
+	else
+		e_data_book_view_notify_update_vcard (book_view, final_vcard);
+
+	if (final_vcard != (gchar *)vcard)
+		g_free (final_vcard);
+}
+
 static gpointer
 book_view_thread (gpointer data)
 {
@@ -546,10 +576,11 @@ book_view_thread (gpointer data)
 	FileBackendSearchClosure *closure;
 	EBookBackendFile *bf;
 	const gchar *query;
+	const gchar **requested_fields;
 	DB  *db;
 	DBT id_dbt, vcard_dbt;
 	gint db_error;
-	gboolean allcontacts;
+	gboolean allcontacts, uid_only;
 
 	g_return_val_if_fail (E_IS_DATA_BOOK_VIEW (data), NULL);
 
@@ -578,6 +609,13 @@ book_view_thread (gpointer data)
 		allcontacts = FALSE;
 	}
 
+	/* If only the UID was requested, avoid digging everything else up */
+	requested_fields = e_data_book_view_get_requested_fields (book_view);
+	if (requested_fields && requested_fields[0] != NULL && requested_fields[1] == NULL)
+		uid_only = (strcmp (e_contact_field_name (E_CONTACT_UID), requested_fields[0]) == 0);
+	else
+		uid_only = FALSE;
+
 	d(printf ("signalling parent thread\n"));
 	e_flag_set (closure->running);
 
@@ -602,7 +640,7 @@ book_view_thread (gpointer data)
 			db_error = db->get (db, NULL, &id_dbt, &vcard_dbt, 0);
 
 			if (db_error == 0) {
-				e_data_book_view_notify_update_prefiltered_vcard (book_view, id, vcard_dbt.data);
+				notify_update_vcard (book_view, uid_only, TRUE, id, vcard_dbt.data);
 			}
 			else {
 				g_warning (G_STRLOC ": db->get failed with %s", db_strerror (db_error));
@@ -630,10 +668,8 @@ book_view_thread (gpointer data)
 
 				/* don't include the version in the list of cards */
 				if (strcmp (id_dbt.data, E_BOOK_BACKEND_FILE_VERSION_NAME)) {
-					if (allcontacts)
-						e_data_book_view_notify_update_prefiltered_vcard (book_view, id_dbt.data, vcard_dbt.data);
-					else
-						e_data_book_view_notify_update_vcard (book_view, vcard_dbt.data);
+					notify_update_vcard (book_view, uid_only, allcontacts, 
+							     id_dbt.data, vcard_dbt.data);
 				} else {
 					g_free (vcard_dbt.data);
 				}