database: Add private find_unique_doc_id and find_unique_document functions

[notmuch] / database.cc

diff --git a/database.cc b/database.cc
index e315f8dc08bf0c2d4411efc157ab75c9c26f4865..442b850d2264874442837fe2ec8e279d03fdc352 100644 (file)
--- a/database.cc
+++ b/database.cc
@@ -74,29 +74,67 @@ add_term (Xapian::Document doc,
 }
 
 static void
-find_messages_by_term (Xapian::Database *db,
-                      const char *prefix_name,
-                      const char *value,
-                      Xapian::PostingIterator *begin,
-                      Xapian::PostingIterator *end)
+find_doc_ids (notmuch_database_t *notmuch,
+             const char *prefix_name,
+             const char *value,
+             Xapian::PostingIterator *begin,
+             Xapian::PostingIterator *end)
 {
     Xapian::PostingIterator i;
     char *term;
 
     term = g_strdup_printf ("%s%s", _find_prefix (prefix_name), value);
 
-    *begin = db->postlist_begin (term);
+    *begin = notmuch->xapian_db->postlist_begin (term);
 
-    if (end)
-       *end = db->postlist_end (term);
+    *end = notmuch->xapian_db->postlist_end (term);
 
     free (term);
 }
 
-Xapian::Document
-find_message_by_docid (Xapian::Database *db, Xapian::docid docid)
+static notmuch_private_status_t
+find_unique_doc_id (notmuch_database_t *notmuch,
+                   const char *prefix_name,
+                   const char *value,
+                   unsigned int *doc_id)
 {
-    return db->get_document (docid);
+    Xapian::PostingIterator i, end;
+
+    find_doc_ids (notmuch, prefix_name, value, &i, &end);
+
+    if (i == end) {
+       *doc_id = 0;
+       return NOTMUCH_PRIVATE_STATUS_NO_DOCUMENT_FOUND;
+    } else {
+       *doc_id = *i;
+       return NOTMUCH_PRIVATE_STATUS_SUCCESS;
+    }
+}
+
+static Xapian::Document
+find_document_for_doc_id (notmuch_database_t *notmuch, unsigned doc_id)
+{
+    return notmuch->xapian_db->get_document (doc_id);
+}
+
+static notmuch_private_status_t
+find_unique_document (notmuch_database_t *notmuch,
+                     const char *prefix_name,
+                     const char *value,
+                     Xapian::Document *document,
+                     unsigned int *doc_id)
+{
+    notmuch_private_status_t status;
+
+    status = find_unique_doc_id (notmuch, prefix_name, value, doc_id);
+
+    if (status) {
+       *document = Xapian::Document ();
+       return status;
+    }
+
+    *document = find_document_for_doc_id (notmuch, *doc_id);
+    return NOTMUCH_PRIVATE_STATUS_SUCCESS;
 }
 
 static void
@@ -126,15 +164,15 @@ notmuch_message_t *
 notmuch_database_find_message (notmuch_database_t *notmuch,
                               const char *message_id)
 {
-    Xapian::PostingIterator i, end;
+    notmuch_private_status_t status;
+    unsigned int doc_id;
 
-    find_messages_by_term (notmuch->xapian_db,
-                          "msgid", message_id, &i, &end);
+    status = find_unique_doc_id (notmuch, "msgid", message_id, &doc_id);
 
-    if (i == end)
+    if (status == NOTMUCH_PRIVATE_STATUS_NO_DOCUMENT_FOUND)
        return NULL;
 
-    return _notmuch_message_create (notmuch, notmuch, *i);
+    return _notmuch_message_create (notmuch, notmuch, doc_id);
 }
 
 /* Return one or more thread_ids, (as a GPtrArray of strings), for the
@@ -149,7 +187,6 @@ find_thread_ids (notmuch_database_t *notmuch,
                 GPtrArray *parents,
                 const char *message_id)
 {
-    Xapian::WritableDatabase *db = notmuch->xapian_db;
     Xapian::PostingIterator child, children_end;
     Xapian::Document doc;
     GHashTable *thread_ids;
@@ -161,9 +198,9 @@ find_thread_ids (notmuch_database_t *notmuch,
     thread_ids = g_hash_table_new_full (g_str_hash, g_str_equal,
                                        free, NULL);
 
-    find_messages_by_term (db, "ref", message_id, &child, &children_end);
+    find_doc_ids (notmuch, "ref", message_id, &child, &children_end);
     for ( ; child != children_end; child++) {
-       doc = find_message_by_docid (db, *child);
+       doc = find_document_for_doc_id (notmuch, *child);
        insert_thread_id (thread_ids, doc);
     }