["Refactoring"]
----
[[TableOfContents]]
= Chapter 7 Moving Features Between Objects =
== Move Method ==
A method is, or will be, using or used by more features of another class than the class on which it is defined.

''Create a new method with a similar body in the class it uses most. Either turn the old method into a simple delegation, or remove it altogether.''

http://zeropage.org/~reset/zb/data/MoveMethod.gif
== Move Field ==
A field is, or will be, used by another class more than the class on which it is defined.

''Create a new field in the target class, and change all its users.''

http://zeropage.org/~reset/zb/data/MoveField.gif
== Extract Class ==
You have one class doing work that should be done by two.

''Create a new class and move the relevant fields and methods from the old class into the new class.''

http://zeropage.org/~reset/zb/data/1012450988/ExtractClass.gif
== Inline Class ==
A class isn't doing very much.

''Move all its features into another class and delete it.''

http://zeropage.org/~reset/zb/data/InlineClass.gif
== Hide Delegate ==
A client is calling a delegate class of an object.

''Create methods on the server to hide the delegate.''

http://zeropage.org/~reset/zb/data/HideDelegate.gif
== Remove Middle Man ==
A class is doing too much simple delegation.

''Get the client to call the delegate directly.''

http://zeropage.org/~reset/zb/data/RemoveMiddleMan.gif
== Introduce Foreign Method ==
A server class you are using needs an additional method, but you can't modify the class.

''Create a method in the client class with an instance of the server class as its first argument.''
{{{~cpp 
Date newStart = new Date (previousEnd.getYear(), previousEnd.getMonth(), previousEnd.getDate() + 1);
}}}

{{{~cpp 
Date newStart = nextDay (previousEnd);

private static Date nextDay (Date arg) {
	return new Date (arg.getYear(), arg.getMonth(), arg.getDate() + 1);
}
}}}


== Introduce Local Extension ==
A server class you are using needs serveral additional methods, but you can't modify the class.

''Create a new class that contains these extra methods. Make the extension class a subclass or a wapper of the original.''

http://zeropage.org/~reset/zb/data/IntroduceLocalExtension.gif
----
["Refactoring"]