/**
* Parses the key turning it into a string (or array is required) suitable to be passed to the cache store.
*
* @param string|int $key As passed to get|set|delete etc.
* @return string|array String unless the store supports multi-identifiers in which case an array if returned.
*/
protected function parse_key($key)
{
// First up if the store supports multiple keys we'll go with that.
if ($this->store->supports_multiple_identifiers()) {
$result = $this->definition->generate_multi_key_parts();
$result['key'] = $key;
return $result;
}
// If not we need to generate a hash and to for that we use the cache_helper.
return cache_helper::hash_key($key, $this->definition);
}
/**
* Test the hash_key functionality.
*/
public function test_hash_key()
{
global $CFG;
$currentdebugging = $CFG->debug;
$CFG->debug = E_ALL;
// First with simplekeys
$instance = cache_config_phpunittest::instance(true);
$instance->phpunit_add_definition('phpunit/hashtest', array('mode' => cache_store::MODE_APPLICATION, 'component' => 'phpunit', 'area' => 'hashtest', 'simplekeys' => true));
$factory = cache_factory::instance();
$definition = $factory->create_definition('phpunit', 'hashtest');
$result = cache_helper::hash_key('test', $definition);
$this->assertEquals('test-' . $definition->generate_single_key_prefix(), $result);
try {
cache_helper::hash_key('test/test', $definition);
$this->fail('Invalid key was allowed, you should see this.');
} catch (coding_exception $e) {
$this->assertEquals('test/test', $e->debuginfo);
}
// Second without simple keys
$instance->phpunit_add_definition('phpunit/hashtest2', array('mode' => cache_store::MODE_APPLICATION, 'component' => 'phpunit', 'area' => 'hashtest2', 'simplekeys' => false));
$definition = $factory->create_definition('phpunit', 'hashtest2');
$result = cache_helper::hash_key('test', $definition);
$this->assertEquals(sha1($definition->generate_single_key_prefix() . '-test'), $result);
$result = cache_helper::hash_key('test/test', $definition);
$this->assertEquals(sha1($definition->generate_single_key_prefix() . '-test/test'), $result);
$CFG->debug = $currentdebugging;
}