private int ascertainParentFingerprint ( DeterministicKey parentKey , int parentFingerprint ) throws IllegalArgumentException { if ( parentFingerprint != 0 ) { if ( parent != null ) checkArgument ( parent . getFingerprint ( ) == parentFingerprint , "parent fingerprint mismatch" , Integer . toHexString ( parent . getFingerprint ( ) ) , Integer . toHexString ( parentFingerprint ) ) ; return parentFingerprint ; } else return 0 ; }
Return the fingerprint of this key s parent as an int value or zero if this key is the root node of the key hierarchy . Raise an exception if the arguments are inconsistent . This method exists to avoid code repetition in the constructors .