function views_handler_filter_term_node_tid_depth_join::query

Overrides views_handler_filter_in_operator::query

File

modules/taxonomy/views_handler_filter_term_node_tid_depth_join.inc, line 55

Class

views_handler_filter_term_node_tid_depth_join

Filter handler for taxonomy terms with depth.

Code

public function query() {
    // If no filter values are present, then do nothing.
    if (count($this->value) == 0) {
        return;
    }
    elseif (count($this->value) == 1) {
        // Somethis $this->value is an array with a single element so convert it.
        if (is_array($this->value)) {
            $this->value = current($this->value);
        }
        $operator = '=';
    }
    else {
        $operator = 'IN';
        // " IN ("
        // . implode(', ', array_fill(0, sizeof($this->value), '%d'))
        // . ")";
    }
    // The normal use of ensure_my_table() here breaks Views.
    // So instead we trick the filter into using the alias of the base table.
    // See http://drupal.org/node/271833
    // If a relationship is set, we must use the alias it provides.
    if (!empty($this->relationship)) {
        $this->table_alias = $this->relationship;
    }
    elseif (isset($this->query->table_queue[$this->query->base_table]['alias'])) {
        $this->table_alias = $this->query->table_queue[$this->query->base_table]['alias'];
    }
    else {
        return;
    }
    // The tids variable can be an integer or an array of integers.
    $tids = is_array($this->value) ? $this->value : array(
        $this->value,
    );
    if ($this->options['depth'] > 0) {
        // When the depth is positive search the children.
        foreach ($tids as $tid) {
            // The term must be loaded to get vid for use in taxonomy_get_tree().
            if ($term = taxonomy_term_load($tid)) {
                // For every tid argument find all the children down to the depth set
                // in the options and save the tids for the condition.
                $tree = taxonomy_get_tree($term->vid, $term->tid, (int) $this->options['depth']);
                $tids = array_merge($tids, array_map('_taxonomy_get_tid_from_term', $tree));
            }
        }
    }
    elseif ($this->options['depth'] < 0) {
        // When the depth is negative search the parents.
        foreach ($tids as $tid) {
            // For every tid argument find all the parents up to the depth set
            // in the options and add the tids into the array. Since there is
            // no taxonomy function to get all parents with a depth limit it
            // is done here building a multidimensional array.
            if ($term = taxonomy_term_load($tid)) {
                // A variable is needed to track the current depth level.
                $n = 0;
                // Initialise our depth based parents array with the leaf term.
                $parents[$n--][] = $term;
                while ($n >= $this->options['depth']) {
                    // At each depth find the parents of the current terms.
                    // It is important to note that it is possible for a term to have
                    // multiple parents so get the parents of every parent and so on.
                    $parents[$n] = array();
                    foreach ($parents[$n + 1] as $term) {
                        $parents[$n] += taxonomy_get_parents($term->tid);
                    }
                    // Save all the tids for the condition.
                    $tids = array_merge($tids, array_map('_taxonomy_get_tid_from_term', $parents[$n]));
                    $n--;
                }
            }
        }
    }
    // Check the size of the array and set the operator accordingly.
    if (count($tids) > 1) {
        $operator = 'IN';
    }
    else {
        $tids = current($tids);
        $operator = '=';
    }
    // Join on taxonomy index table.
    $join = new views_join();
    $join->table = 'taxonomy_index';
    $join->field = 'nid';
    $join->left_table = $this->table_alias;
    $join->left_field = $this->real_field;
    $join->type = 'INNER';
    $join->extra = array(
        array(
            'field' => 'tid',
            'value' => $tids,
            'operator' => $operator,
        ),
    );
}