/**
* Check for previously cached results
*
* @param string|Query $query the search query
* @return null|ResultSet null if no previously cached results
*/
public function getCachedResults($query)
{
// if cache is turned off, then don't bother looking up cache
if ($this->should_cache_results == false) {
return null;
}
$id = $this->getResultsID($query);
return $this->cache->get($id);
}
/**
* Fetch list of databases
*
* @param bool $force_new get data from ebsco
* @return array
*/
public function getDatabases($force_new = false)
{
$cache = new Cache();
$id = 'ebsco_databases';
if ($force_new == false) {
// do we have it already?
if (count($this->databases) > 0) {
return $this->databases;
}
// check the cache
$this->databases = $cache->get($id);
if ($this->databases != null) {
return $this->databases;
}
}
// fetch 'em from ebsco
$url = $this->host . '/Info?' . 'prof=' . $this->username . '&pwd=' . $this->password;
$client = Factory::getHttpClient();
$response = $client->getUrl($url);
$xml = new \DOMDocument();
$loaded = $xml->loadXML($response);
if ($loaded == true) {
$nodes = $xml->getElementsByTagName('db');
if ($nodes->length > 1) {
foreach ($nodes as $db) {
if ((string) $db->getAttribute('dbType') == 'Regular') {
$id = (string) $db->getAttribute('shortName');
$name = (string) $db->getAttribute('longName');
$this->databases[$id] = $name;
}
}
// cache 'em
$cache->set($id, $this->databases);
}
}
return $this->databases;
}
/**
* Look for any holdings data in the cache and add it to results
*/
public function injectHoldings()
{
// get the record ids for all search results
$ids = $this->extractRecordIDs();
// only if there are actually records here
if (count($ids) > 0) {
// prefix the engine id
for ($x = 0; $x < count($ids); $x++) {
$ids[$x] = $this->config->getID() . "." . $ids[$x];
}
// look for any of our items
$cache = new Cache();
$cache_array = $cache->get($ids);
foreach ($cache_array as $id => $data) {
$holdings = unserialize($data);
if (!$holdings instanceof Holdings) {
throw new \Exception("cached item ({$id}) is not an instance of Holdings");
}
// now associate this item with its corresponding result
for ($x = 0; $x < count($this->records); $x++) {
$search_result = $this->records[$x];
if ($this->config->getID() . "." . $search_result->xerxes_record->getRecordID() == $id) {
$search_result->setHoldings($holdings);
}
$this->records[$x] = $search_result;
}
}
}
}
