Change Value to Reference

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[[Change Reference to Value]] is the opposite of this refactoring, and due to the lack of clarity on what is a value object and what is a reference object, it is common to switch between the two while trying to make a decision.
 
[[Change Reference to Value]] is the opposite of this refactoring, and due to the lack of clarity on what is a value object and what is a reference object, it is common to switch between the two while trying to make a decision.
  
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== See Also ==
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>== See Also ==
  
 
{{Refactoring}}
 
{{Refactoring}}
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Revision as of 03:21, 18 November 2010

In some systems, objects may be classified as reference objects (such as things like "customer" or "account"), or value objects (such as "date" or "money").

This refactoring is the act of changing a class with many equal instances into a single object by turning one of these values into a reference.

Change Reference to Value is the opposite of this refactoring, and due to the lack of clarity on what is a value object and what is a reference object, it is common to switch between the two while trying to make a decision.

>== See Also ==


Refactoring

Composing Methods: Extract Method | Inline Method | Inline Temp | Replace Temp with Query | Introduce Explaining Variable | Split Temporary Variable | Remove assignments to Parameters | Replace Method with Method Object | Substitute Algorithm
Moving Features Between Objects: Move Method | Move Field | Extract Class | Inline Class | Hide Delegate | Remove Middle Man | Introduce Foreign Method | Introduce Local Extension
Organising Data: Self Encapsulate Field | Replace Data Value with Object | Change Value to Reference | Change Reference to Value | Replace Array with Object | Duplicate Observed Data | Change Unidirectional Association to Bidirectional | Change Bidirectional Association to Unidirectional | Replace Magic Number with Symbolic Constant | Encapsulate Field | Encapsulate Collection | Replace Type Code with Class | Replace Type Code with Subclass | Replace Type Code with State/Strategy
Simplifying Conditional Expressions: Decompose Conditional | Consolidate Conditional Expression | Consolidate Duplicate Conditional Fragments | Remove Control Flag | Replace Nested Conditional with Guard Clauses | Replace Conditional with Polymorphism | Introduce Null Object | Introduce Assertion
Making Method Calls Simpler: Rename Method | Add Parameter | Remove Parameter | Separate Query from Modifier | Parameterise Method | Replace Parameter with Explicit Methods | Preserve Whole Object | Replace Parameter with Method | Introduce Parameter Object | Replace Parameter Object | Remove Setting Method | Hide Method | Replace Constructor with Factory Method | Encapsulate Downcast | Replace Error Code with Exception | Replace Exception with test
Dealing with Generalisation: Pull Up Field | Pull Up Method | Pull Up Constructor Body | Push Down Field | Push Down Method | Extract Subclass | Extract Superclass | Extract Interface | Collapse Hierarchy | Form Template Method | Replace Inheritance with Delegation
Big Refactorings: Tease Apart Inheritance | Convert Procedural Design to Objects | Separate Domain from Presentation | Extract Hierarchy

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