["Refactoring"]
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[[TableOfContents]]
= Chapter 8 Organizing Data p169 =
== Self Encapsulate Field p171 ==
 * You are accessing a field directly, but the coupling to the field is becoming awkward. [[BR]] ''Create getting and setting methods for the field and use only those to access the field.''
{{{~cpp 
    private int _low, _high;
    boolean includes (int arg){
        return arg >= _low && arg <= _high;
    }
}}}

{{{~cpp 
    private int _low, _high;
    boolean includes (int arg){
        return arg >= getLow() && arg <= getHigh();
    }
    int getLow() {return _low;}
    int getHigh() {return _high;}
}}}
== Replace Data Value with Object p175 ==
 * You have a data item that needs additional data or behavior. [[BR]] ''Turn the data item into an object.''

http://zeropage.org/~reset/zb/data/ReplaceDateValueWithObject.gif
== Change Value to Reference p179 ==
 * You have a class with many equal instances that you want to replace with a single object. [[BR]] ''Turn the object into a reference object.''

http://zeropage.org/~reset/zb/data/ChangeValueToReference.gif
== Change Reference to Value p183 ==
 * You have a reference object that is small, immutable, and awkward to manage. [[BR]] ''Turn it into a balue object.''

http://zeropage.org/~reset/zb/data/ChangeReferenceToValue.gif
== Replace Array with Object p186 ==
 * You have an array in which certain elements mean different things. [[BR]]''Replace the array with an object that has a field for each element.''
{{{~cpp 
    String[] row = new String[3];
    row [0] = "Liverpool";
    row [1] = "15";
}}}
{{{~cpp 
    Performance row = new Performance();
    row.setName("Liverpool");
    row.setWins("15");
}}}
== Duplicate Observed Data p189 ==
 * You have domain data available only in a GUI control, and domain methods need access. [[BR]] ''Copy the data to a domain object. Set up an observer to synchronize the two pieces of data.''

http://zeropage.org/~reset/zb/data/DuplicateObservedData.gif
== Change Unidirectional Association to Bidirectional p197 ==
 * You have two classes that need to use each other's features, but there is only a one-way link.[[BR]]''Add back pointers, and change modifiers to update both sets.''

http://zeropage.org/~reset/zb/data/ChangeUnidirectionalAssociationToBidirectional.gif
== Change Bidirectional Association to Unidirectional p200 ==
 * You have a two-way associational but one class no longer needs features from the other. [[BR]]''Drop the unneeded end of the association.''

http://zeropage.org/~reset/zb/data/ChangeBidirectionAssociationToUnidirectional.gif  
== Replace Magic Number with Symbolic Constant p204 ==
 * You have a literal number with a paricular meaning. [[BR]] ''Crate a constant, name it after the meaning, and replace the number with it.''
{{{~cpp 
    double potentialEnergy(double mass, double height){
        return mass * 9.91 * height;
    }
}}}
{{{~cpp 
    double potentialEnergy(double mass, double height){
        return mass * GRAVITATION_CONSTNAT * height;
    }
    static final double GRAVITATIONAL_CONSTANT = 9,81;
}}}
== Encapsulate Field p206 ==
 * There is a public field. [[BR]] ''Make it private and provide accessors.''
{{{~cpp 
    public String _name;
}}}
{{{~cpp 
    private String _name;
    public String getName() {return _name;}
    public void setName(String arg) { _name = arg;}
}}}
== Encapsulate Collection p208 ==
 * A method return a collection. [[BR]] ''Make it return a read-only view and provide add/remove methods.''

http://zeropage.org/~reset/zb/data/EncapsulateCollection.gif
== Replace Record with Data Class p217 ==
 * You need to interface with a record structure in a traditional programming environment. [[BR]]''Make a dumb data object for the record.''

== Replace Type Code with Class p218 ==
 * A class has a numeric type code that does not affect its behavior. [[BR]] ''Replace the number with a new class.''

http://zeropage.org/~reset/zb/data/ReplaceTypeCodeWithClass.gif
== Replace Type Code with Subclasses p223 ==
 * You have an immutable type code that affects the bahavior of a class. [[BR]] ''Replace the type code with subclasses.''

http://zeropage.org/~reset/zb/data/ReplaceTypeCodeWithSubclasses.gif
== Replace Type code with State/Strategy p227 ==
 * You have a type code that affects the behavior of a class, but you cannot use subclassing. [[BR]] ''REplace the type code with a state object.''

http://zeropage.org/~reset/zb/data/ReplaceTypeCodeWithStateStrategy.gif
== Replace Subclass with Fields p232 ==
 * You have subclasses that vary only in methods that return constant data.[[BR]]''Change the mehtods to superclass fields and eliminate the subclasses.''

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