[tracker: 2/3] SPARQL: Drop deprecated support for DROP GRAPH

[Jürg Billeter <juergbi src gnome org>]

commit 90b586cccdf5f9da34c70fdf935bc522406ab6e5
Author: Jürg Billeter <j bitron ch>
Date:   Tue Dec 21 14:32:13 2010 +0100

    SPARQL: Drop deprecated support for DROP GRAPH
    
    The behavior was not conforming to the specification, and all users
    have been ported.

 src/libtracker-data/libtracker-data.vapi      |    1 -
 src/libtracker-data/tracker-data-update.c     |  234 -------------------------
 src/libtracker-data/tracker-data-update.h     |    3 -
 src/libtracker-data/tracker-sparql-query.vala |   16 +--
 4 files changed, 1 insertions(+), 253 deletions(-)
---
diff --git a/src/libtracker-data/libtracker-data.vapi b/src/libtracker-data/libtracker-data.vapi
index bb26b5c..27955a0 100644
--- a/src/libtracker-data/libtracker-data.vapi
+++ b/src/libtracker-data/libtracker-data.vapi
@@ -146,7 +146,6 @@ namespace Tracker {
 		public void insert_statement (string graph, string subject, string predicate, string object) throws Sparql.Error, DateError;
 		public void insert_statement_with_uri (string graph, string subject, string predicate, string object) throws Sparql.Error;
 		public void insert_statement_with_string (string graph, string subject, string predicate, string object) throws Sparql.Error, DateError;
-		public void delete_resource_description (string graph, string uri) throws Sparql.Error;
 		public void update_buffer_flush () throws DBInterfaceError;
 		public void update_buffer_might_flush () throws DBInterfaceError;
 	}
diff --git a/src/libtracker-data/tracker-data-update.c b/src/libtracker-data/tracker-data-update.c
index 9f6dc33..5f9bf64 100644
--- a/src/libtracker-data/tracker-data-update.c
+++ b/src/libtracker-data/tracker-data-update.c
@@ -2390,240 +2390,6 @@ format_sql_value_as_string (GString         *sql,
 	}
 }
 
-/**
- * Removes the description of a resource (embedded metadata), but keeps
- * annotations (non-embedded/user metadata) stored about the resource.
- */
-void
-tracker_data_delete_resource_description (const gchar *graph,
-                                          const gchar *url,
-                                          GError **error)
-{
-	TrackerDBInterface *iface;
-	TrackerDBStatement *stmt;
-	TrackerDBResultSet *result_set = NULL, *single_result, *multi_result = NULL;
-	TrackerClass       *class;
-	gchar              *urn;
-	GString            *sql;
-	TrackerProperty   **properties, *property;
-	int                 i;
-	gboolean            first, bail_out = FALSE;
-	gint                resource_id;
-	guint               p, n_props;
-	GError             *actual_error = NULL;
-
-	/* We use result_sets instead of cursors here because it's possible
-	 * that otherwise the query of the outer cursor would be reused by the
-	 * cursors of the inner queries. */
-
-	iface = tracker_db_manager_get_db_interface ();
-
-	/* DROP GRAPH <url> - url here is nie:url */
-
-	stmt = tracker_db_interface_create_statement (iface, TRACKER_DB_STATEMENT_CACHE_TYPE_SELECT, &actual_error,
-	                                              "SELECT ID, (SELECT Uri FROM Resource WHERE ID = \"nie:DataObject\".ID) FROM \"nie:DataObject\" WHERE \"nie:DataObject\".\"nie:url\" = ?");
-
-	if (stmt) {
-		tracker_db_statement_bind_text (stmt, 0, url);
-		result_set = tracker_db_statement_execute (stmt, &actual_error);
-		g_object_unref (stmt);
-	}
-
-	if (actual_error) {
-		g_propagate_error (error, actual_error);
-		return;
-	}
-
-	if (result_set) {
-		tracker_db_result_set_get (result_set, 0, &resource_id, -1);
-		tracker_db_result_set_get (result_set, 1, &urn, -1);
-		g_object_unref (result_set);
-	} else {
-		/* For fallback to the old behaviour, we could do this here:
-		 * resource_id = tracker_data_query_resource_id (url); */
-		return;
-	}
-
-	properties = tracker_ontologies_get_properties (&n_props);
-
-	stmt = tracker_db_interface_create_statement (iface, TRACKER_DB_STATEMENT_CACHE_TYPE_SELECT, &actual_error,
-	                                              "SELECT (SELECT Uri FROM Resource WHERE ID = \"rdf:type\") FROM \"rdfs:Resource_rdf:type\" WHERE ID = ?");
-
-	if (stmt) {
-		tracker_db_statement_bind_int (stmt, 0, resource_id);
-		result_set = tracker_db_statement_execute (stmt, &actual_error);
-		g_object_unref (stmt);
-	}
-
-	if (actual_error) {
-		g_propagate_error (error, actual_error);
-		return;
-	}
-
-	if (result_set) {
-		do {
-			gchar *class_uri;
-
-			tracker_db_result_set_get (result_set, 0, &class_uri, -1);
-
-			class = tracker_ontologies_get_class_by_uri (class_uri);
-
-			if (class == NULL) {
-				g_warning ("Class '%s' not found in the ontology", class_uri);
-				g_free (class_uri);
-				continue;
-			}
-			g_free (class_uri);
-
-			/* retrieve single value properties for current class */
-
-			sql = g_string_new ("SELECT ");
-
-			first = TRUE;
-
-			for (p = 0; p < n_props; p++) {
-				property = properties[p];
-
-				if (tracker_property_get_domain (property) == class) {
-					if (!tracker_property_get_embedded (property)) {
-						continue;
-					}
-
-					if (!tracker_property_get_multiple_values (property)) {
-						if (!first) {
-							g_string_append (sql, ", ");
-						}
-						first = FALSE;
-
-						format_sql_value_as_string (sql, property);
-					}
-				}
-			}
-
-			single_result = NULL;
-			if (!first) {
-				g_string_append_printf (sql, " FROM \"%s\" WHERE ID = ?", tracker_class_get_name (class));
-				stmt = tracker_db_interface_create_statement (iface, TRACKER_DB_STATEMENT_CACHE_TYPE_SELECT,
-				                                              &actual_error, "%s", sql->str);
-
-				if (stmt) {
-					tracker_db_statement_bind_int (stmt, 0, resource_id);
-					single_result = tracker_db_statement_execute (stmt, &actual_error);
-					g_object_unref (stmt);
-				}
-
-				if (actual_error) {
-					g_propagate_error (error, actual_error);
-					bail_out = TRUE;
-					break;
-				}
-			}
-
-			g_string_free (sql, TRUE);
-
-			i = 0;
-			for (p = 0; p < n_props; p++) {
-				property = properties[p];
-
-				if (tracker_property_get_domain (property) != class) {
-					continue;
-				}
-
-				if (!tracker_property_get_embedded (property)) {
-					continue;
-				}
-
-				if (property == tracker_ontologies_get_rdf_type ()) {
-					/* Do not delete rdf:type statements */
-					continue;
-				}
-
-				if (!tracker_property_get_multiple_values (property)) {
-					gchar *value;
-
-					/* single value property, value in single_result_set */
-
-					tracker_db_result_set_get (single_result, i++, &value, -1);
-
-					if (value) {
-						tracker_data_delete_statement (graph, urn,
-						                               tracker_property_get_uri (property),
-						                               value,
-						                               &actual_error);
-						if (actual_error) {
-							g_propagate_error (error, actual_error);
-							bail_out = TRUE;
-							break;
-						}
-						g_free (value);
-					}
-
-				} else {
-					/* multi value property, retrieve values from DB */
-
-					sql = g_string_new ("SELECT ");
-
-					format_sql_value_as_string (sql, property);
-
-					g_string_append_printf (sql,
-					                        " FROM \"%s\" WHERE ID = ?",
-					                        tracker_property_get_table_name (property));
-
-					stmt = tracker_db_interface_create_statement (iface, TRACKER_DB_STATEMENT_CACHE_TYPE_SELECT,
-					                                              &actual_error, "%s", sql->str);
-
-					if (stmt) {
-						tracker_db_statement_bind_int (stmt, 0, resource_id);
-						multi_result = tracker_db_statement_execute (stmt, NULL);
-						g_object_unref (stmt);
-					}
-
-					if (actual_error) {
-						g_propagate_error (error, actual_error);
-						bail_out = TRUE;
-						break;
-					}
-
-					if (multi_result) {
-						do {
-							gchar *value;
-
-							tracker_db_result_set_get (multi_result, 0, &value, -1);
-
-							tracker_data_delete_statement (graph, urn,
-							                               tracker_property_get_uri (property),
-							                               value,
-							                               &actual_error);
-
-							g_free (value);
-
-							if (actual_error) {
-								g_propagate_error (error, actual_error);
-								bail_out = TRUE;
-								break;
-							}
-
-						} while (tracker_db_result_set_iter_next (multi_result));
-
-						g_object_unref (multi_result);
-					}
-
-					g_string_free (sql, TRUE);
-				}
-			}
-
-			if (!first) {
-				g_object_unref (single_result);
-			}
-
-		} while (!bail_out && tracker_db_result_set_iter_next (result_set));
-
-		g_object_unref (result_set);
-	}
-
-	g_free (urn);
-}
-
 void
 tracker_data_rollback_transaction (void)
 {
diff --git a/src/libtracker-data/tracker-data-update.h b/src/libtracker-data/tracker-data-update.h
index 61d39f0..2137541 100644
--- a/src/libtracker-data/tracker-data-update.h
+++ b/src/libtracker-data/tracker-data-update.h
@@ -49,9 +49,6 @@ typedef void (*TrackerCommitCallback)    (gboolean     start_timer,
 GQuark   tracker_data_error_quark                   (void);
 
 /* Metadata */
-void     tracker_data_delete_resource_description   (const gchar               *graph,
-                                                     const gchar               *url,
-                                                     GError                   **error);
 void     tracker_data_delete_statement              (const gchar               *graph,
                                                      const gchar               *subject,
                                                      const gchar               *predicate,
diff --git a/src/libtracker-data/tracker-sparql-query.vala b/src/libtracker-data/tracker-sparql-query.vala
index e4be8b6..9411af0 100644
--- a/src/libtracker-data/tracker-sparql-query.vala
+++ b/src/libtracker-data/tracker-sparql-query.vala
@@ -474,8 +474,7 @@ public class Tracker.Sparql.Query : Object {
 				}
 				break;
 			case SparqlTokenType.DROP:
-				execute_drop_graph ();
-				break;
+				throw get_internal_error ("DROP GRAPH is not supported");
 			case SparqlTokenType.SELECT:
 			case SparqlTokenType.CONSTRUCT:
 			case SparqlTokenType.DESCRIBE:
@@ -745,19 +744,6 @@ public class Tracker.Sparql.Query : Object {
 		return update_blank_nodes;
 	}
 
-	void execute_drop_graph () throws DBInterfaceError, Sparql.Error {
-		expect (SparqlTokenType.DROP);
-		expect (SparqlTokenType.GRAPH);
-
-		bool is_var;
-		string url = pattern.parse_var_or_term (null, out is_var);
-
-		Data.delete_resource_description (url, url);
-
-		// ensure possible WHERE clause in next part gets the correct results
-		Data.update_buffer_flush ();
-	}
-
 	internal string resolve_prefixed_name (string prefix, string local_name) throws Sparql.Error {
 		string ns = prefix_map.lookup (prefix);
 		if (ns == null) {