addressbook
Class FileSystem

java.lang.Object
  addressbook.FileSystem

public class FileSystem
extends java.lang.Object

An object of this class manages interaction between the address book program and the file system of the computer it is running on.

Constructor Summary

FileSystem()

Method Summary

java.lang.String	getDefaultDirectory() Get the default directory for open/save/print
AddressBook	readFile(java.io.File file) Read a stored file
void	saveFile(AddressBook addressBook, java.io.File file) Save an address book to a file

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

FileSystem

public FileSystem()

Method Detail

readFile

public AddressBook readFile(java.io.File file)
                     throws java.io.IOException,
                            java.lang.ClassNotFoundException

Read a stored file

Parameters:

file - the file specification for the file to read

Returns:

the AddressBook object stored in the file

Throws:

java.io.IOException - if there is a problem reading the file

java.lang.ClassCastException - if the file does not contain an AddressBook

java.lang.ClassNotFoundException - if the file does not contain an AddressBook, and the class it does contain is not found - this should never happen

saveFile

public void saveFile(AddressBook addressBook,
                     java.io.File file)
              throws java.io.IOException

Save an address book to a file

Parameters:

addressBook - the AddressBook to save

file - the file specification for the file to create

Throws:

java.io.IOException - if there is a problem writing the file

getDefaultDirectory

public java.lang.String getDefaultDirectory()

Get the default directory for open/save/print

Returns:

the default directory, or the user's home directory if there is none