Immutable Class Builders
 
The other day I showed 1 way to make a Class #Builder more meaningful, #semantically, leveraging the #programming language's type system. Today, I'm going to address how to make them immutable, its benefits, and its drawbacks.
 
Why?
 
Class Builders typically use mutable architectures where the programming language allows. In #Java we often see the following model:
 
@Immutable  
final Class Person {  
 
public final Name name;  
public final Address address;  
 
Person(final Builder builder) {  
  this.name = builder.name:  
  this.address = builder.getAddress();  
}  
 
}  
   
@Mutable
final class Builder {  
 
public final Name name;
@Nullable private Address address;
 
private Builder(final Name name) {
  this.name = name:  
  this.address = Address.empty();  
}  
 
public static Builder named (final Name name) {  
  return new Builder(name);  
}  
 
public Builder with (@Nullable final Address address) {
  this.address = (null == address) ? Address.empty() : address;
}  
 
public Address getAddress () {
  return (null == this.address) ? Address.empty() : this.address;
}  
 
public Person build () {  
  return new Person(this);
}  
 
}  
 
Whatever Person field is required, we find in the Builder's constructor. In the above example, that's Name.
 
Other fields are optional, and their value is added to a Person instance by using one if the Builder.with() instance methods.
 
Note how the Builder also features a …

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