Refactoring/OrganizingData - Revision history

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← Older revision		Revision as of 00:29, 27 March 2026
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	[[Refactoring]]		Refactoring
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	__TOC__		__TOC__
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	== Replace Array with Object p186 ==		== 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.''		* 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.''
	String[] row = new String[3];		String[] row = new String[3];
	row [0] = "Liverpool";		row [0] = "Liverpool";
	row [1] = "15";		row [1] = "15";
	Performance row = new Performance();		Performance row = new Performance();
	row.setName("Liverpool");		row.setName("Liverpool");
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	http://zeropage.org/~reset/zb/data/ReplaceSubclassWithFields.gif		http://zeropage.org/~reset/zb/data/ReplaceSubclassWithFields.gif
	----		----
	[[Refactoring]]		Refactoring

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

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. ''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. ''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. ''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. ''Replace the array with an object that has a field for each element.''
String[] row = new String[3];
row [0] = "Liverpool";
row [1] = "15";
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. ''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.''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. ''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. ''Crate a constant, name it after the meaning, and replace the number with it.''
double potentialEnergy(double mass, double height){
return mass * 9.91 * height;
}
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. ''Make it private and provide accessors.''
public String _name;
private String _name;
public String getName() {return _name;}
public void setName(String arg) { _name = arg;}
== Encapsulate Collection p208 ==
* A method return a collection. ''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. ''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. ''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. ''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. ''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.''Change the mehtods to superclass fields and eliminate the subclasses.''

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

← Older revision		Revision as of 14:01, 26 March 2026
Line 4:		Line 4:
	= Chapter 8 Organizing Data p169 =		= Chapter 8 Organizing Data p169 =
	== Self Encapsulate Field p171 ==		== Self Encapsulate Field p171 ==
	* You are accessing a field directly, but the coupling to the field is becoming awkward. ''Create getting and setting methods for the field and use only those to access the field.''		* 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.''
	private int _low, _high;		private int _low, _high;
	boolean includes (int arg){		boolean includes (int arg){
Line 17:		Line 17:
	int getHigh() {return _high;}		int getHigh() {return _high;}
	== Replace Data Value with Object p175 ==		== Replace Data Value with Object p175 ==
	* You have a data item that needs additional data or behavior. ''Turn the data item into an object.''		* 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		http://zeropage.org/~reset/zb/data/ReplaceDateValueWithObject.gif
	== Change Value to Reference p179 ==		== Change Value to Reference p179 ==
	* You have a class with many equal instances that you want to replace with a single object. ''Turn the object into a reference object.''		* 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		http://zeropage.org/~reset/zb/data/ChangeValueToReference.gif
	== Change Reference to Value p183 ==		== Change Reference to Value p183 ==
	* You have a reference object that is small, immutable, and awkward to manage. ''Turn it into a balue object.''		* 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		http://zeropage.org/~reset/zb/data/ChangeReferenceToValue.gif
	== Replace Array with Object p186 ==		== Replace Array with Object p186 ==
	* You have an array in which certain elements mean different things. ''Replace the array with an object that has a field for each element.''		* 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.''
	String[] row = new String[3];		String[] row = new String[3];
	row [0] = "Liverpool";		row [0] = "Liverpool";
Line 37:		Line 37:
	row.setWins("15");		row.setWins("15");
	== Duplicate Observed Data p189 ==		== Duplicate Observed Data p189 ==
	* You have domain data available only in a GUI control, and domain methods need access. ''Copy the data to a domain object. Set up an observer to synchronize the two pieces of data.''		* 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		http://zeropage.org/~reset/zb/data/DuplicateObservedData.gif
	== Change Unidirectional Association to Bidirectional p197 ==		== 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.''Add back pointers, and change modifiers to update both sets.''		* 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		http://zeropage.org/~reset/zb/data/ChangeUnidirectionalAssociationToBidirectional.gif
	== Change Bidirectional Association to Unidirectional p200 ==		== Change Bidirectional Association to Unidirectional p200 ==
	* You have a two-way associational but one class no longer needs features from the other. ''Drop the unneeded end of the association.''		* 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		http://zeropage.org/~reset/zb/data/ChangeBidirectionAssociationToUnidirectional.gif
	== Replace Magic Number with Symbolic Constant p204 ==		== Replace Magic Number with Symbolic Constant p204 ==
	* You have a literal number with a paricular meaning. ''Crate a constant, name it after the meaning, and replace the number with it.''		* You have a literal number with a paricular meaning. <br /> ''Crate a constant, name it after the meaning, and replace the number with it.''
	double potentialEnergy(double mass, double height){		double potentialEnergy(double mass, double height){
	return mass * 9.91 * height;		return mass * 9.91 * height;
Line 58:		Line 58:
	static final double GRAVITATIONAL_CONSTANT = 9,81;		static final double GRAVITATIONAL_CONSTANT = 9,81;
	== Encapsulate Field p206 ==		== Encapsulate Field p206 ==
	* There is a public field. ''Make it private and provide accessors.''		* There is a public field. <br /> ''Make it private and provide accessors.''
	public String _name;		public String _name;
	private String _name;		private String _name;
Line 64:		Line 64:
	public void setName(String arg) { _name = arg;}		public void setName(String arg) { _name = arg;}
	== Encapsulate Collection p208 ==		== Encapsulate Collection p208 ==
	* A method return a collection. ''Make it return a read-only view and provide add/remove methods.''		* 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		http://zeropage.org/~reset/zb/data/EncapsulateCollection.gif
	== Replace Record with Data Class p217 ==		== Replace Record with Data Class p217 ==
	* You need to interface with a record structure in a traditional programming environment. ''Make a dumb data object for the record.''		* 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 ==		== Replace Type Code with Class p218 ==
	* A class has a numeric type code that does not affect its behavior. ''Replace the number with a new class.''		* 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		http://zeropage.org/~reset/zb/data/ReplaceTypeCodeWithClass.gif
	== Replace Type Code with Subclasses p223 ==		== Replace Type Code with Subclasses p223 ==
	* You have an immutable type code that affects the bahavior of a class. ''Replace the type code with subclasses.''		* 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		http://zeropage.org/~reset/zb/data/ReplaceTypeCodeWithSubclasses.gif
	== Replace Type code with State/Strategy p227 ==		== Replace Type code with State/Strategy p227 ==
	* You have a type code that affects the behavior of a class, but you cannot use subclassing. ''REplace the type code with a state object.''		* 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		http://zeropage.org/~reset/zb/data/ReplaceTypeCodeWithStateStrategy.gif
	== Replace Subclass with Fields p232 ==		== Replace Subclass with Fields p232 ==
	* You have subclasses that vary only in methods that return constant data.''Change the mehtods to superclass fields and eliminate the subclasses.''		* 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		http://zeropage.org/~reset/zb/data/ReplaceSubclassWithFields.gif
	----		----
	[[Refactoring]]		[[Refactoring]]