public function getMetadata()
    {
        $cache_key = md5(serialize($this->params));
        if (!array_key_exists($cache_key, self::$metadataCache)) {
            if ($this->metadata === null) {
                self::$metadataCache[$cache_key] = $this->getDefaultMetadata();
            } else {
                self::$metadataCache[$cache_key] = $this->metadata;
            }
        }
        return self::$metadataCache[$cache_key];
    }
public function getMetadata()
    {
        $cache_key = md5(serialize($this->params));
        if (!array_key_exists($cache_key, self::$metadataCache)) {
            if ($this->metadata === null) {
                self::$metadataCache[$cache_key] = $this->getDefaultMetadata();
            } else {
                self::$metadataCache[$cache_key] = $this->metadata;
            }
        }
        return self::$metadataCache[$cache_key];
    }
public function getMetadata ( ) { $ cache_key = md5 ( serialize ( $ this -> params ) ) ; if ( ! array_key_exists ( $ cache_key , self :: $ metadataCache ) ) { if ( $ this -> metadata === null ) { self :: $ metadataCache [ $ cache_key ] = $ this -> getDefaultMetadata ( ) ; } else { self :: $ metadataCache [ $ cache_key ] = $ this -> metadata ; } } return self :: $ metadataCache [ $ cache_key ] ; }
Get internal metadata reader

@return Source\AbstractSchemaSource
Get internal metadata reader