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 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-

  * vim: sw=2 ts=2 et lcs=trail\:.,tab\:>~ :

  * This Source Code Form is subject to the terms of the Mozilla Public

  * License, v. 2.0. If a copy of the MPL was not distributed with this

  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

 #include "nsPlacesTables.h"

 #ifndef __nsPlacesTriggers_h__

 #define __nsPlacesTriggers_h__

 /**

  * Exclude these visit types:

  *  0 - invalid

  *  4 - EMBED

  *  7 - DOWNLOAD

  *  7 - FRAMED_LINK

  **/

 #define EXCLUDED_VISIT_TYPES "0, 4, 7, 8"

 /**

  * This triggers update visit_count and last_visit_date based on historyvisits

  * table changes.

  */

 #define CREATE_HISTORYVISITS_AFTERINSERT_TRIGGER NS_LITERAL_CSTRING( \

   "CREATE TEMP TRIGGER moz_historyvisits_afterinsert_v2_trigger " \

   "AFTER INSERT ON moz_historyvisits FOR EACH ROW " \

   "BEGIN " \

     "UPDATE moz_places SET " \

       "visit_count = visit_count + (SELECT NEW.visit_type NOT IN (" EXCLUDED_VISIT_TYPES ")), "\

       "last_visit_date = MAX(IFNULL(last_visit_date, 0), NEW.visit_date) " \

     "WHERE id = NEW.place_id;" \

   "END" \

 )

 #define CREATE_HISTORYVISITS_AFTERDELETE_TRIGGER NS_LITERAL_CSTRING( \

   "CREATE TEMP TRIGGER moz_historyvisits_afterdelete_v2_trigger " \

   "AFTER DELETE ON moz_historyvisits FOR EACH ROW " \

   "BEGIN " \

     "UPDATE moz_places SET " \

       "visit_count = visit_count - (SELECT OLD.visit_type NOT IN (" EXCLUDED_VISIT_TYPES ")), "\

       "last_visit_date = (SELECT visit_date FROM moz_historyvisits " \

                          "WHERE place_id = OLD.place_id " \

                          "ORDER BY visit_date DESC LIMIT 1) " \

     "WHERE id = OLD.place_id;" \

   "END" \

 )

 /**

  * A predicate matching pages on rev_host, based on a given host value.

  * 'host' may be either the moz_hosts.host column or an alias representing an

  * equivalent value.

  */

 #define HOST_TO_REVHOST_PREDICATE \

   "rev_host = get_unreversed_host(host || '.') || '.' " \

   "OR rev_host = get_unreversed_host(host || '.') || '.www.'"

 /**

  * Select the best prefix for a host, based on existing pages registered for it.

  * Prefixes have a priority, from the top to the bottom, so that secure pages

  * have higher priority, and more generically "www." prefixed hosts come before

  * unprefixed ones.

  * Given a host, examine associated pages and:

  *  - if all of the typed pages start with https://www. return https://www.

  *  - if all of the typed pages start with https:// return https://

  *  - if all of the typed pages start with ftp: return ftp://

  *  - if all of the typed pages start with www. return www.

  *  - otherwise don't use any prefix

  */

 #define HOSTS_PREFIX_PRIORITY_FRAGMENT \

   "SELECT CASE " \

     "WHEN 1 = ( " \

       "SELECT min(substr(url,1,12) = 'https://www.') FROM moz_places h " \

       "WHERE (" HOST_TO_REVHOST_PREDICATE ") AND +h.typed = 1 " \

     ") THEN 'https://www.' " \

     "WHEN 1 = ( " \

       "SELECT min(substr(url,1,8) = 'https://') FROM moz_places h " \

       "WHERE (" HOST_TO_REVHOST_PREDICATE ") AND +h.typed = 1 " \

     ") THEN 'https://' " \

     "WHEN 1 = ( " \

       "SELECT min(substr(url,1,4) = 'ftp:') FROM moz_places h " \

       "WHERE (" HOST_TO_REVHOST_PREDICATE ") AND +h.typed = 1 " \

     ") THEN 'ftp://' " \

     "WHEN 1 = ( " \

       "SELECT min(substr(url,1,11) = 'http://www.') FROM moz_places h " \

       "WHERE (" HOST_TO_REVHOST_PREDICATE ") AND +h.typed = 1 " \

     ") THEN 'www.' " \

   "END "

 /**

  * These triggers update the hostnames table whenever moz_places changes.

  */

 #define CREATE_PLACES_AFTERINSERT_TRIGGER NS_LITERAL_CSTRING( \

   "CREATE TEMP TRIGGER moz_places_afterinsert_trigger " \

   "AFTER INSERT ON moz_places FOR EACH ROW " \

   "WHEN LENGTH(NEW.rev_host) > 1 " \

   "BEGIN " \

     "INSERT OR REPLACE INTO moz_hosts (id, host, frecency, typed, prefix) " \

     "VALUES (" \

       "(SELECT id FROM moz_hosts WHERE host = fixup_url(get_unreversed_host(NEW.rev_host))), " \

       "fixup_url(get_unreversed_host(NEW.rev_host)), " \

       "MAX(IFNULL((SELECT frecency FROM moz_hosts WHERE host = fixup_url(get_unreversed_host(NEW.rev_host))), -1), NEW.frecency), " \

       "MAX(IFNULL((SELECT typed FROM moz_hosts WHERE host = fixup_url(get_unreversed_host(NEW.rev_host))), 0), NEW.typed), " \

       "(" HOSTS_PREFIX_PRIORITY_FRAGMENT \

        "FROM ( " \

           "SELECT fixup_url(get_unreversed_host(NEW.rev_host)) AS host " \

         ") AS match " \

       ") " \

     "); " \

   "END" \

 )

 #define CREATE_PLACES_AFTERDELETE_TRIGGER NS_LITERAL_CSTRING( \

   "CREATE TEMP TRIGGER moz_places_afterdelete_trigger " \

   "AFTER DELETE ON moz_places FOR EACH ROW " \

   "BEGIN " \

     "DELETE FROM moz_hosts " \

     "WHERE host = fixup_url(get_unreversed_host(OLD.rev_host)) " \

       "AND NOT EXISTS(" \

         "SELECT 1 FROM moz_places " \

           "WHERE rev_host = get_unreversed_host(host || '.') || '.' " \

              "OR rev_host = get_unreversed_host(host || '.') || '.www.' " \

       "); " \

     "UPDATE moz_hosts " \

     "SET prefix = (" HOSTS_PREFIX_PRIORITY_FRAGMENT ") " \

     "WHERE host = fixup_url(get_unreversed_host(OLD.rev_host)); " \

   "END" \

 )

 // For performance reasons the host frecency is updated only when the page

 // frecency changes by a meaningful percentage.  This is because the frecency

 // decay algorithm requires to update all the frecencies at once, causing a

 // too high overhead, while leaving the ordering unchanged.

 #define CREATE_PLACES_AFTERUPDATE_FRECENCY_TRIGGER NS_LITERAL_CSTRING( \

   "CREATE TEMP TRIGGER moz_places_afterupdate_frecency_trigger " \

   "AFTER UPDATE OF frecency ON moz_places FOR EACH ROW " \

   "WHEN NEW.frecency >= 0 " \

     "AND ABS(" \

       "IFNULL((NEW.frecency - OLD.frecency) / CAST(NEW.frecency AS REAL), " \

              "(NEW.frecency - OLD.frecency))" \

     ") > .05 " \

   "BEGIN " \

     "UPDATE moz_hosts " \

     "SET frecency = (SELECT MAX(frecency) FROM moz_places " \

                     "WHERE rev_host = get_unreversed_host(host || '.') || '.' " \

                        "OR rev_host = get_unreversed_host(host || '.') || '.www.') " \

     "WHERE host = fixup_url(get_unreversed_host(NEW.rev_host)); " \

   "END" \

 )

 #define CREATE_PLACES_AFTERUPDATE_TYPED_TRIGGER NS_LITERAL_CSTRING( \

   "CREATE TEMP TRIGGER moz_places_afterupdate_typed_trigger " \

   "AFTER UPDATE OF typed ON moz_places FOR EACH ROW " \

   "WHEN NEW.typed = 1 " \

   "BEGIN " \

     "UPDATE moz_hosts " \

     "SET typed = 1 " \

     "WHERE host = fixup_url(get_unreversed_host(NEW.rev_host)); " \

   "END" \

 )

 /**

  * This trigger removes a row from moz_openpages_temp when open_count reaches 0.

  *

  * @note this should be kept up-to-date with the definition in

  *       nsPlacesAutoComplete.js

  */

 #define CREATE_REMOVEOPENPAGE_CLEANUP_TRIGGER NS_LITERAL_CSTRING( \

   "CREATE TEMPORARY TRIGGER moz_openpages_temp_afterupdate_trigger " \

   "AFTER UPDATE OF open_count ON moz_openpages_temp FOR EACH ROW " \

   "WHEN NEW.open_count = 0 " \

   "BEGIN " \

     "DELETE FROM moz_openpages_temp " \

     "WHERE url = NEW.url;" \

   "END" \

 )

 #endif // __nsPlacesTriggers_h__