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<?php
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/**
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* @file
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* Definition of views_handler_filter_term_node_tid_depth_join.
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*/
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/**
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* Filter handler for taxonomy terms with depth.
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*
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* This handler is actually part of the node table and has some restrictions,
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* because it uses a subquery to find nodes with.
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*
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* @ingroup views_filter_handlers
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*/
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class views_handler_filter_term_node_tid_depth_join extends views_handler_filter_term_node_tid {
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function operator_options($which = 'title') {
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return array(
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'or' => t('Is one of'),
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);
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}
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function option_definition() {
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$options = parent::option_definition();
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$options['depth'] = array('default' => 0);
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return $options;
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}
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function extra_options_form(&$form, &$form_state) {
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parent::extra_options_form($form, $form_state);
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$form['depth'] = array(
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'#type' => 'weight',
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'#title' => t('Depth'),
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'#default_value' => $this->options['depth'],
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'#description' => t('The depth will match nodes tagged with terms in the hierarchy. For example, if you have the term "fruit" and a child term "apple", with a depth of 1 (or higher) then filtering for the term "fruit" will get nodes that are tagged with "apple" as well as "fruit". If negative, the reverse is true; searching for "apple" will also pick up nodes tagged with "fruit" if depth is -1 (or lower).'),
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);
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}
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function query() {
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// If no filter values are present, then do nothing.
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if (count($this->value) == 0) {
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return;
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}
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elseif (count($this->value) == 1) {
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// Somethis $this->value is an array with a single element so convert it.
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if (is_array($this->value)) {
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$this->value = current($this->value);
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}
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$operator = '=';
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}
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else {
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$operator = 'IN';# " IN (" . implode(', ', array_fill(0, sizeof($this->value), '%d')) . ")";
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}
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// The normal use of ensure_my_table() here breaks Views.
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// So instead we trick the filter into using the alias of the base table.
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// See http://drupal.org/node/271833
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// If a relationship is set, we must use the alias it provides.
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if (!empty($this->relationship)) {
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$this->table_alias = $this->relationship;
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}
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// If no relationship, then use the alias of the base table.
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elseif (isset($this->query->table_queue[$this->query->base_table]['alias'])) {
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$this->table_alias = $this->query->table_queue[$this->query->base_table]['alias'];
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}
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// This should never happen, but if it does, we fail quietly.
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else {
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return;
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}
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// The tids variable can be an integer or an array of integers.
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$tids = is_array($this->value) ? $this->value : array($this->value);
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if ($this->options['depth'] > 0) {
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// When the depth is positive search the children.
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foreach ($tids as $tid) {
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// The term must be loaded to get vid for use in taxonomy_get_tree().
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if ($term = taxonomy_term_load($tid)) {
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// For every tid argument find all the children down to the depth set
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// in the options and save the tids for the condition.
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$tree = taxonomy_get_tree($term->vid, $term->tid, (int) $this->options['depth']);
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$tids = array_merge($tids, array_map('_taxonomy_get_tid_from_term', $tree));
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}
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}
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}
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elseif ($this->options['depth'] < 0) {
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// When the depth is negative search the parents.
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foreach ($tids as $tid) {
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// For every tid argument find all the parents up to the depth set
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// in the options and add the tids into the array. Since there is
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// no taxonomy function to get all parents with a depth limit it
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// is done here building a multidimensional array.
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if ($term = taxonomy_term_load($tid)) {
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// A variable is needed to track the current depth level.
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$n = 0;
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// Initialise our depth based parents array with the leaf term.
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$parents[$n--][] = $term;
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while ($n >= $this->options['depth']) {
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// At each depth find the parents of the current terms.
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// It is important to note that it is possible for a term to have
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// multiple parents so get the parents of every parent and so on.
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$parents[$n] = array();
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foreach ($parents[$n + 1] as $term) {
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$parents[$n] += taxonomy_get_parents($term->tid);
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}
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// Save all the tids for the condition.
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$tids = array_merge($tids, array_map('_taxonomy_get_tid_from_term', $parents[$n]));
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$n--;
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}
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}
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}
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}
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// Check the size of the array and set the operator accordingly.
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if (count($tids) > 1) {
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$operator = 'IN';
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}
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else {
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$tids = current($tids);
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$operator = '=';
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}
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// Join on taxonomy index table.
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$join = new views_join();
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$join->table = 'taxonomy_index';
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$join->field = 'nid';
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$join->left_table = $this->table_alias;
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$join->left_field = $this->real_field;
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$join->type = 'INNER';
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$join->extra = array(
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array(
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'field' => 'tid',
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'value' => $tids,
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'operator' => $operator,
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)
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);
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$taxonomy_index_alias = $this->query->add_relationship('taxonomy_index', $join, 'node');
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}
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}
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