[evolution-data-server] Revert "ESourceRegistry: Do not mandate builtin sources."

[Matthew Barnes <mbarnes src gnome org>]

commit c33d4829b083557383d5d4a819057e98b210e428
Author: Matthew Barnes <mbarnes redhat com>
Date:   Sat Dec 15 07:42:14 2012 -0500

    Revert "ESourceRegistry: Do not mandate builtin sources."
    
    This reverts commit 78340f9274d5c2ee0f52507f935f97d6b92f513e.
    
    This violates a key invariant of the get_default() and especially
    get_builtin() functions: that they never return NULL.

 addressbook/backends/file/e-book-backend-file.c |    5 ++---
 addressbook/libebook/e-book-client.c            |    1 -
 calendar/backends/file/e-cal-backend-file.c     |    5 ++---
 libedataserver/e-source-registry.c              |   10 ++++++++--
 tests/libebook/client/client-test-utils.c       |    1 -
 5 files changed, 12 insertions(+), 10 deletions(-)
---
diff --git a/addressbook/backends/file/e-book-backend-file.c b/addressbook/backends/file/e-book-backend-file.c
index 351e288..6fb1483 100644
--- a/addressbook/backends/file/e-book-backend-file.c
+++ b/addressbook/backends/file/e-book-backend-file.c
@@ -241,7 +241,7 @@ e_book_backend_file_extract_path_from_source (ESourceRegistry *registry,
 	 * "system-$COMPONENT" but since the data directories are already
 	 * split out by component, we'll continue to use the old "system"
 	 * directories for these particular data sources. */
-	if (builtin_source != NULL && e_source_equal (source, builtin_source))
+	if (e_source_equal (source, builtin_source))
 		uid = "system";
 
 	switch (path_type) {
@@ -257,8 +257,7 @@ e_book_backend_file_extract_path_from_source (ESourceRegistry *registry,
 			g_warn_if_reached ();
 	}
 
-	if (builtin_source)
-		g_object_unref (builtin_source);
+	g_object_unref (builtin_source);
 
 	return filename;
 }
diff --git a/addressbook/libebook/e-book-client.c b/addressbook/libebook/e-book-client.c
index 45d04cf..f80bc63 100644
--- a/addressbook/libebook/e-book-client.c
+++ b/addressbook/libebook/e-book-client.c
@@ -1034,7 +1034,6 @@ e_book_client_get_self (ESourceRegistry *registry,
 	g_return_val_if_fail (E_IS_BOOK_CLIENT (client), FALSE);
 
 	source = e_source_registry_ref_builtin_address_book (registry);
-	g_return_val_if_fail (source != NULL, FALSE);
 	*client = e_book_client_new (source, &local_error);
 	g_object_unref (source);
 
diff --git a/calendar/backends/file/e-cal-backend-file.c b/calendar/backends/file/e-cal-backend-file.c
index cd4ac34..00fa8d0 100644
--- a/calendar/backends/file/e-cal-backend-file.c
+++ b/calendar/backends/file/e-cal-backend-file.c
@@ -3431,15 +3431,14 @@ cal_backend_file_constructed (GObject *object)
 	 * "system-$COMPONENT" but since the data directories are already
 	 * split out by component, we'll continue to use the old "system"
 	 * directories for these particular data sources. */
-	if (builtin_source != NULL && e_source_equal (source, builtin_source))
+	if (e_source_equal (source, builtin_source))
 		uid = "system";
 
 	filename = g_build_filename (user_data_dir, component_type, uid, NULL);
 	e_cal_backend_set_cache_dir (backend, filename);
 	g_free (filename);
 
-	if (builtin_source)
-		g_object_unref (builtin_source);
+	g_object_unref (builtin_source);
 }
 
 /* Class initialization function for the file backend */
diff --git a/libedataserver/e-source-registry.c b/libedataserver/e-source-registry.c
index 5d2c553..93ae50b 100644
--- a/libedataserver/e-source-registry.c
+++ b/libedataserver/e-source-registry.c
@@ -2743,6 +2743,7 @@ e_source_registry_ref_builtin_address_book (ESourceRegistry *registry)
 
 	uid = E_SOURCE_BUILTIN_ADDRESS_BOOK_UID;
 	source = e_source_registry_ref_source (registry, uid);
+	g_return_val_if_fail (source != NULL, NULL);
 
 	return source;
 }
@@ -2776,10 +2777,12 @@ e_source_registry_ref_default_address_book (ESourceRegistry *registry)
 	source = e_source_registry_ref_source (registry, uid);
 	g_free (uid);
 
-	/* The built-in source is present in normal EDS installations. */
+	/* The built-in source is always present. */
 	if (source == NULL)
 		source = e_source_registry_ref_builtin_address_book (registry);
 
+	g_return_val_if_fail (E_IS_SOURCE (source), NULL);
+
 	return source;
 }
 
@@ -2842,6 +2845,7 @@ e_source_registry_ref_builtin_calendar (ESourceRegistry *registry)
 
 	uid = E_SOURCE_BUILTIN_CALENDAR_UID;
 	source = e_source_registry_ref_source (registry, uid);
+	g_return_val_if_fail (source != NULL, NULL);
 
 	return source;
 }
@@ -2875,10 +2879,12 @@ e_source_registry_ref_default_calendar (ESourceRegistry *registry)
 	source = e_source_registry_ref_source (registry, uid);
 	g_free (uid);
 
-	/* The built-in source is present in normal EDS installations. */
+	/* The built-in source is always present. */
 	if (source == NULL)
 		source = e_source_registry_ref_builtin_calendar (registry);
 
+	g_return_val_if_fail (E_IS_SOURCE (source), NULL);
+
 	return source;
 }
 
diff --git a/tests/libebook/client/client-test-utils.c b/tests/libebook/client/client-test-utils.c
index bb41e82..f9bda66 100644
--- a/tests/libebook/client/client-test-utils.c
+++ b/tests/libebook/client/client-test-utils.c
@@ -71,7 +71,6 @@ open_system_book (ESourceRegistry *registry,
 	main_initialize ();
 
 	source = e_source_registry_ref_builtin_address_book (registry);
-	g_return_val_if_fail (source != NULL, NULL);
 	book_client = e_book_client_new (source, &error);
 	g_object_unref (source);