119 lines
4.5 KiB
PHP
119 lines
4.5 KiB
PHP
<?php defined("SYSPATH") or die("No direct script access.");/**
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* Gallery - a web based photo album viewer and editor
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* Copyright (C) 2000-2013 Bharat Mediratta
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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class dynamic_Core {
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static function get_display_count($dynamic_type_definition) {
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$display_limit = $dynamic_type_definition->limit;
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$children_count = ORM::factory("item")
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->viewable()
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->where("type", "!=", "album")
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->count_all();
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if (!empty($display_limit)) {
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$children_count = min($children_count, $display_limit);
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}
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return $children_count;
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}
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static function items($key_field, $limit=null, $offset=null) {
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return ORM::factory("item")
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->viewable()
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->where("type", "!=", "album")
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->order_by($key_field, "DESC")
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->find_all($limit, $offset);
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}
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/**
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* Find the position of the given item in the tag collection. The resulting
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* value is 1-indexed, so the first child in the album is at position 1.
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*
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* @param Tag_Model $tag
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* @param Item_Model $item
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* @param array $where an array of arrays, each compatible with ORM::where()
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*/
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static function get_position($dynamic_type_definition, $item) {
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$sort_column = $dynamic_type_definition->key_field;
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$display_limit = self::get_display_count($dynamic_type_definition);
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$query_model = ORM::factory("item");
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// If the comparison column has NULLs in it, we can't use comparators on it
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// and will have to deal with it the hard way.
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$count = $query_model->viewable()
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->where($sort_column, "IS", null)
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->where("type", "!=", "album")
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->count_all();
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if (empty($count)) {
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// There are no NULLs in the sort column, so we can just use it directly.
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$position = $query_model->viewable()
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->where($sort_column, ">", $item->$sort_column)
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->where("type", "!=", "album")
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->order_by(array($dynamic_type_definition->key_field => "DESC", "id" => "ASC"))
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->count_all();
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// We stopped short of our target value in the sort (notice that we're
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// using a inequality comparator above) because it's possible that we have
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// duplicate values in the sort column. An equality check would just
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// arbitrarily pick one of those multiple possible equivalent columns,
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// which would mean that if you choose a sort order that has duplicates,
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// it'd pick any one of them as the child's "position".
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//
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// Fix this by doing a 2nd query where we iterate over the equivalent
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// columns and add them to our position count.
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foreach ($query_model->viewable()
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->select("id")
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->where($sort_column, "=", $item->$sort_column)
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->where("type", "!=", "album")
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->order_by(array("id" => "ASC"))
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->find_all($display_limit) as $row) {
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$position++;
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if ($row->id == $item->id) {
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break;
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}
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}
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} else {
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// There are NULLs in the sort column, so we can't use MySQL comparators.
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// Fall back to iterating over every child row to get to the current one.
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// This can be wildly inefficient for really large albums, but it should
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// be a rare case that the user is sorting an album with null values in
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// the sort column.
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//
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// Reproduce the children() functionality here using Database directly to
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// avoid loading the whole ORM for each row.
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$order_by = array($sort_column => "DESC", $order_by["id"] => "ASC");
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$position = 0;
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foreach ($query_model->viewable()
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->select("id")
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->where("parent_id", "=", $album->id)
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->where("type", "!=", "album")
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->order_by($order_by)
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->find_all($display_limit) as $row) {
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$position++;
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if ($row->id == $item->id) {
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break;
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}
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}
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}
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return $position;
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}
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}
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