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/*
* Copyright (C) 2011 Nokia <ivan.frade@nokia.com>
*
* Author: Carlos Garnacho <carlos@lanedo.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#include "config.h"
#include <libtracker-common/tracker-common.h>
#include "tracker-fts-tokenizer.h"
#include "tracker-fts.h"
#ifndef HAVE_BUILTIN_FTS
#include "sqlite3.h"
#include "fts5.h"
int sqlite3_fts5_init ();
#endif
static gchar **
get_fts_properties (GHashTable *tables)
{
GList *table_columns;
GArray *property_names;
GList *keys, *l;
keys = g_hash_table_get_keys (tables);
keys = g_list_sort (keys, (GCompareFunc) strcmp);
property_names = g_array_new (TRUE, FALSE, sizeof (gchar *));
for (l = keys; l; l = l->next) {
table_columns = g_hash_table_lookup (tables, l->data);
while (table_columns) {
gchar *str;
str = g_strdup (table_columns->data);
g_array_append_val (property_names, str);
table_columns = table_columns->next;
}
}
g_list_free (keys);
return (gchar **) g_array_free (property_names, FALSE);
}
gboolean
tracker_fts_init_db (sqlite3 *db,
TrackerDBInterface *interface,
TrackerDBManagerFlags flags,
GHashTable *tables)
{
gchar **property_names;
gboolean retval;
#ifndef HAVE_BUILTIN_FTS
gchar *err;
if (sqlite3_load_extension (db, NULL, "sqlite3_fts5_init", &err) != SQLITE_OK) {
g_warning ("Could not load fts5 module: %s", err);
return FALSE;
}
#endif
property_names = get_fts_properties (tables);
retval = tracker_tokenizer_initialize (db, interface, flags, (const gchar **) property_names);
g_strfreev (property_names);
return retval;
}
gboolean
tracker_fts_create_table (sqlite3 *db,
const gchar *database,
gchar *table_name,
GHashTable *tables,
GHashTable *grouped_columns)
{
GString *str, *from, *fts;
gchar *index_table;
GList *columns, *keys, *l;
gint rc;
if (g_hash_table_size (tables) == 0)
return TRUE;
/* Create view on tables/columns marked as FTS-indexed */
str = g_string_new ("CREATE VIEW ");
g_string_append_printf (str, "\"%s\".fts_view AS SELECT \"rdfs:Resource\".ID as rowid ",
database);
from = g_string_new ("FROM \"rdfs:Resource\" ");
fts = g_string_new ("CREATE VIRTUAL TABLE ");
g_string_append_printf (fts, "\"%s\".%s USING fts5(content=\"fts_view\", ",
database, table_name);
keys = g_hash_table_get_keys (tables);
keys = g_list_sort (keys, (GCompareFunc) strcmp);
for (l = keys; l; l = l->next) {
index_table = l->data;
columns = g_hash_table_lookup (tables, l->data);
while (columns) {
if (grouped_columns &&
g_hash_table_lookup (grouped_columns, columns->data)) {
g_string_append_printf (str, ", group_concat(\"%s\".\"%s\")",
index_table,
(gchar *) columns->data);
} else {
g_string_append_printf (str, ", \"%s\".\"%s\"",
index_table,
(gchar *) columns->data);
}
g_string_append_printf (str, " AS \"%s\" ",
(gchar *) columns->data);
g_string_append_printf (fts, "\"%s\", ",
(gchar *) columns->data);
columns = columns->next;
}
g_string_append_printf (from, "LEFT OUTER JOIN \"%s\".\"%s\" ON "
" \"rdfs:Resource\".ID = \"%s\".ID ",
database, index_table, index_table);
}
g_list_free (keys);
g_string_append (str, from->str);
g_string_free (from, TRUE);
rc = sqlite3_exec(db, str->str, NULL, NULL, NULL);
g_string_free (str, TRUE);
if (rc != SQLITE_OK) {
g_assert_not_reached();
return FALSE;
}
g_string_append (fts, "tokenize=TrackerTokenizer)");
rc = sqlite3_exec(db, fts->str, NULL, NULL, NULL);
g_string_free (fts, TRUE);
if (rc != SQLITE_OK)
return FALSE;
str = g_string_new (NULL);
g_string_append_printf (str,
"INSERT INTO %s(%s, rank) VALUES('rank', 'tracker_rank()')",
table_name, table_name);
rc = sqlite3_exec (db, str->str, NULL, NULL, NULL);
g_string_free (str, TRUE);
return (rc == SQLITE_OK);
}
gboolean
tracker_fts_delete_table (sqlite3 *db,
const gchar *database,
gchar *table_name)
{
gchar *query;
int rc;
query = g_strdup_printf ("DROP VIEW IF EXISTS fts_view");
rc = sqlite3_exec (db, query, NULL, NULL, NULL);
g_free (query);
if (rc == SQLITE_OK) {
query = g_strdup_printf ("DROP TABLE IF EXISTS \"%s\".%s",
database, table_name);
rc = sqlite3_exec (db, query, NULL, NULL, NULL);
g_free (query);
}
return rc == SQLITE_OK;
}
gboolean
tracker_fts_alter_table (sqlite3 *db,
const gchar *database,
gchar *table_name,
GHashTable *tables,
GHashTable *grouped_columns)
{
gchar *query, *tmp_name;
int rc;
if (g_hash_table_size (tables) == 0)
return TRUE;
tmp_name = g_strdup_printf ("%s_TMP", table_name);
if (!tracker_fts_create_table (db, database, tmp_name, tables, grouped_columns)) {
g_free (tmp_name);
return FALSE;
}
query = g_strdup_printf ("INSERT INTO \"%s\".%s (rowid) SELECT rowid FROM fts_view",
database, tmp_name);
rc = sqlite3_exec (db, query, NULL, NULL, NULL);
g_free (query);
if (rc != SQLITE_OK) {
g_free (tmp_name);
return FALSE;
}
query = g_strdup_printf ("INSERT INTO \"%s\".%s(%s) VALUES('rebuild')",
database, tmp_name, tmp_name);
rc = sqlite3_exec (db, query, NULL, NULL, NULL);
g_free (query);
if (rc != SQLITE_OK) {
g_free (tmp_name);
return FALSE;
}
query = g_strdup_printf ("ALTER TABLE \"%s\".%s RENAME TO %s",
database, tmp_name, table_name);
rc = sqlite3_exec (db, query, NULL, NULL, NULL);
g_free (query);
g_free (tmp_name);
return rc == SQLITE_OK;
}
void
tracker_fts_rebuild_tokens (sqlite3 *db,
const gchar *database,
const gchar *table_name)
{
gchar *query;
gint rc;
/* This special query rebuilds the tokens in the given FTS table */
query = g_strdup_printf ("INSERT INTO \"%s\".%s(%s) VALUES('rebuild')",
database, table_name, table_name);
rc = sqlite3_exec(db, query, NULL, NULL, NULL);
g_free (query);
g_warn_if_fail (rc == SQLITE_OK);
}
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