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| author | Carlos Garnacho <carlosg@gnome.org> | 2018-12-24 19:11:57 +0100 |
|---|---|---|
| committer | Carlos Garnacho <carlosg@gnome.org> | 2018-12-26 13:21:38 +0100 |
| commit | 0d5c1a65f5a1ea331d438b863e9b6fff14b2dff3 (patch) | |
| tree | 82cf0a3855695ccb87ee72540402d39b2e551979 | |
| parent | 862b1617269f5466c658b9a01366f0a399e44a14 (diff) | |
| download | tracker-0d5c1a65f5a1ea331d438b863e9b6fff14b2dff3.tar.gz | |
libtracker-data: Implement alternative path sequences
The alternative path operator '|' allows multiplexing the ways to get a
value. For example:
{ ?u nie:title|nfo:fileName 'foo' }
will return elements whose title or filename matches the given string.
| -rw-r--r-- | src/libtracker-data/tracker-sparql.c | 52 |
1 files changed, 47 insertions, 5 deletions
diff --git a/src/libtracker-data/tracker-sparql.c b/src/libtracker-data/tracker-sparql.c index d2e9477c4..d123c6330 100644 --- a/src/libtracker-data/tracker-sparql.c +++ b/src/libtracker-data/tracker-sparql.c @@ -570,6 +570,18 @@ _prepend_path_element (TrackerSparql *sparql, path_elem->data.composite.child1->name, path_elem->data.composite.child2->name); break; + case TRACKER_PATH_OPERATOR_ALTERNATIVE: + _append_string_printf (sparql, + "\"%s\" (ID, value, graph) AS " + "(SELECT ID, value, graph " + "FROM \"%s\" " + "UNION ALL " + "SELECT ID, value, graph " + "FROM \"%s\") ", + path_elem->name, + path_elem->data.composite.child1->name, + path_elem->data.composite.child2->name); + break; case TRACKER_PATH_OPERATOR_ZEROORMORE: _append_string_printf (sparql, "\"%s\" (ID, value, graph) AS " @@ -610,9 +622,6 @@ _prepend_path_element (TrackerSparql *sparql, path_elem->data.composite.child1->name, path_elem->data.composite.child1->name); break; - default: - g_assert_not_reached (); - break; } tracker_sparql_swap_builder (sparql, old); @@ -4199,14 +4208,47 @@ static gboolean translate_PathAlternative (TrackerSparql *sparql, GError **error) { + GPtrArray *path_elems; + + path_elems = g_ptr_array_new (); + /* PathAlternative ::= PathSequence ( '|' PathSequence )* */ _call_rule (sparql, NAMED_RULE_PathSequence, error); + g_ptr_array_add (path_elems, sparql->current_state.path); - if (_accept (sparql, RULE_TYPE_LITERAL, LITERAL_PATH_ALTERNATIVE)) { - _unimplemented ("Alternative property path"); + while (_accept (sparql, RULE_TYPE_LITERAL, LITERAL_PATH_ALTERNATIVE)) { + _call_rule (sparql, NAMED_RULE_PathSequence, error); + g_ptr_array_add (path_elems, sparql->current_state.path); } + if (path_elems->len > 1) { + TrackerPathElement *path_elem; + gint i; + + path_elem = tracker_path_element_operator_new (TRACKER_PATH_OPERATOR_ALTERNATIVE, + g_ptr_array_index (path_elems, 0), + g_ptr_array_index (path_elems, 1)); + tracker_select_context_add_path_element (TRACKER_SELECT_CONTEXT (sparql->context), + path_elem); + _prepend_path_element (sparql, path_elem); + + for (i = 2; i < path_elems->len; i++) { + TrackerPathElement *child; + + child = g_ptr_array_index (path_elems, i); + path_elem = tracker_path_element_operator_new (TRACKER_PATH_OPERATOR_ALTERNATIVE, + child, path_elem); + tracker_select_context_add_path_element (TRACKER_SELECT_CONTEXT (sparql->context), + path_elem); + _prepend_path_element (sparql, path_elem); + } + + sparql->current_state.path = path_elem; + } + + g_ptr_array_unref (path_elems); + return TRUE; } |