question: public < T > T retrieve ( String key , final Class < T > clazz , boolean isEncrypted , String encryptKey ) { key = safetyKey ( key ) ; File file = new File ( cacheDirectory , key ) ; if ( isEncrypted ) { file = fileEncryptor . decrypt ( encryptKey , file ) ; } try { T data = jolyglot . fromJson ( file , clazz ) ; return data ; } catch ( Exception ignore ) { return null ; } finally { if ( isEncrypted ) { file . delete ( ) ; } } }
target:  Retrieve the object previously saved.