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<?php
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/**
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* @file
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* Load Views' data so that it knows what is available to build queries from.
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*/
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/**
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* Fetch Views' data from the cache.
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*
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* @param string $table
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* @param bool $move
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* Under certain circumstances it makes sense to not get the moved table, but
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* the old one. One example is views_get_handler.
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* @param bool $reset
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*/
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function _views_fetch_data($table = NULL, $move = TRUE, $reset = FALSE) {
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$cache = &drupal_static(__FUNCTION__ . '_cache');
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$recursion_protection = &drupal_static(__FUNCTION__ . '_recursion_protected');
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$fully_loaded = &drupal_static(__FUNCTION__ . '_fully_loaded');
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if ($reset) {
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$cache = NULL;
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$fully_loaded = FALSE;
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}
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if ($table) {
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if (!isset($cache[$table])) {
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$cid = 'views_data:' . $table;
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if ($data = views_cache_get($cid, TRUE)) {
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$cache[$table] = $data->data;
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}
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else {
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if (!$fully_loaded) {
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// Try to load the full views cache.
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if ($data = views_cache_get('views_data', TRUE)) {
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$cache = $data->data;
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}
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else {
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// No cache entry, rebuild.
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$cache = _views_fetch_data_build();
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}
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$fully_loaded = TRUE;
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}
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// Write back a cache for this table.
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if (isset($cache[$table])) {
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views_cache_set($cid, $cache[$table], TRUE);
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}
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else {
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// If there is still no information about that table, it is missing.
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// Write an empty array to avoid repeated rebuilds.
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views_cache_set($cid, array(), TRUE);
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}
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}
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}
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if (isset($cache[$table])) {
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if (isset($cache[$table]['moved to']) && $move) {
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$moved_table = $cache[$table]['moved to'];
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if (!empty($recursion_protection[$table])) {
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// recursion detected!
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return NULL;
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}
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$recursion_protection[$table] = TRUE;
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$data = _views_fetch_data($moved_table);
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$recursion_protection = array();
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return $data;
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}
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return $cache[$table];
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}
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}
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else {
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if (!$fully_loaded) {
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if ($data = views_cache_get('views_data', TRUE)) {
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$cache = $data->data;
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}
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else {
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// No cache entry, rebuild.
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$cache = _views_fetch_data_build();
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}
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$fully_loaded = TRUE;
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}
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return $cache;
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}
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// Return an empty array if there is no match.
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return array();
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}
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/**
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* Build and set the views data cache if empty.
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*/
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function _views_fetch_data_build() {
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views_include_handlers();
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$cache = module_invoke_all('views_data');
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foreach (module_implements('views_data_alter') as $module) {
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$function = $module . '_views_data_alter';
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$function($cache);
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}
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_views_data_process_entity_types($cache);
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// Keep a record with all data.
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views_cache_set('views_data', $cache, TRUE);
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return $cache;
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}
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/**
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* Links tables having an 'entity type' specified to the respective generic
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* entity-type tables.
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*/
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function _views_data_process_entity_types(&$data) {
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foreach ($data as $table_name => $table_info) {
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// Add in a join from the entity-table if an entity-type is given.
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if (!empty($table_info['table']['entity type'])) {
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$entity_table = 'views_entity_' . $table_info['table']['entity type'];
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$data[$entity_table]['table']['join'][$table_name] = array(
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'left_table' => $table_name,
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);
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$data[$entity_table]['table']['entity type'] = $table_info['table']['entity type'];
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// Copy over the default table group if we have none yet.
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if (!empty($table_info['table']['group']) && empty($data[$entity_table]['table']['group'])) {
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$data[$entity_table]['table']['group'] = $table_info['table']['group'];
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}
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}
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}
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}
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/**
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* Fetch the plugin data from cache.
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*/
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function _views_fetch_plugin_data($type = NULL, $plugin = NULL, $reset = FALSE) {
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static $cache = NULL;
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if (!isset($cache) || $reset) {
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// Load necessary code once.
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if (!isset($cache)) {
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views_include('plugins');
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views_include_handlers();
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}
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// Because plugin data contains translated strings, and as such can be
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// expensive to build, the results are cached per language.
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global $language;
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$cache_key = 'views:plugin_data:' . $language->language;
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if (!$reset) {
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if ($cache = cache_get($cache_key)) {
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$cache = $cache->data;
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}
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}
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// If not available in the cache, build it and cache it.
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if (!$cache || $reset) {
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$cache = views_discover_plugins();
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cache_set($cache_key, $cache);
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}
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}
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if (!$type && !$plugin) {
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return $cache;
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}
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elseif (!$plugin) {
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// Not in the if above so the else below won't run.
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if (isset($cache[$type])) {
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return $cache[$type];
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}
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}
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elseif (isset($cache[$type][$plugin])) {
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return $cache[$type][$plugin];
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}
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// Return an empty array if there is no match.
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return array();
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}
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/**
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* Set a cached item in the views cache.
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*
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* This is just a convenience wrapper around cache_set().
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*
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* @param string $cid
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* The cache ID of the data to store.
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* @param mixed $data
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* The data to store in the cache. Complex data types will be automatically
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* serialized before insertion. Strings will be stored as plain text and not
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* serialized.
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* @param bool $use_language
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* If TRUE, the data will be cached specific to the currently active language.
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*/
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function views_cache_set($cid, $data, $use_language = FALSE) {
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global $language;
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if (variable_get('views_skip_cache', FALSE)) {
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return;
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}
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if ($use_language) {
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$cid .= ':' . $language->language;
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}
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cache_set($cid, $data, 'cache_views');
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}
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/**
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* Return data from the persistent views cache.
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*
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* This is just a convenience wrapper around cache_get().
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*
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* @param int $cid
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* The cache ID of the data to retrieve.
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* @param bool $use_language
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* If TRUE, the data will be requested specific to the currently active
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* language.
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*
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* @return stdClass|bool
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* The cache or FALSE on failure.
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*/
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function views_cache_get($cid, $use_language = FALSE) {
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global $language;
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if (variable_get('views_skip_cache', FALSE)) {
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return FALSE;
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}
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if ($use_language) {
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$cid .= ':' . $language->language;
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}
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return cache_get($cid, 'cache_views');
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}
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