se-edu / addressbook-level4 / 4076

94%

Pull #816

travis-ci

XmlSerializableAddressBook: remove ReadOnlyAddressBook implementation

XmlSerializableAddressBook implements ReadOnlyAddressBook.

There is no longer a need for this implementation since
XmlSerializableAddressBook has a toModelType() method to convert
itself to the model's AddressBook object.

Let's remove XmlSerializableAddressBook implementation of
ReadOnlyAddressBook. Let's also remove tests in XmlUtilTest and
XmlAddressBookStorageTest that treats XmlSerializableAddressBook as a
ReadOnlyAddressBook and calls getPersonList() or getTagList().

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