BuilderDesignPattern[Faceted+Fluent]Example1.swift

//This is function in playground which executes our test code
func main() {
  
  var hitendra = Person() //person with empty details
  let personBuilder = PersonBuilder(person: hitendra)
  
  hitendra = personBuilder
    .personalInfo
      .nameIs("Hitendra Solanki")
      .genderIs("Male")
      .bornOn("2nd Oct 1991")
      .bornAt("Gujarat, India")
      .havingHeight("5.9 ft")
      .havingWeight("85 kg")
    .contacts
      .hasPhone("+91 90333-71772")
      .hasEmail("hitendra.developer@gmail.com")
    .lives
      .at("52nd Godrej Street")
      .inCity("Ahmedabad")
      .withZipCode("380015")
    .build()
  
  //use of Person object
  print("\(hitendra.name) has contact number \(hitendra.phone) and email \(hitendra.email)")
  
  //later on when we have company details ready for the person
  hitendra = personBuilder
    .works
      .asA("Software architect")
      .inCompany("Fortune 500")
      .hasAnnualEarning("45,000 USD")
    .build()
  
  //use of Person object with update info
  print("\(hitendra.name) works in \(hitendra.companyName) compay as a \(hitendra.designation).")
}

//call main to execute our test code
main()

//Person class which only contains the details
class Person {
  //personal details
  var name: String = ""
  var gender: String = ""
  var birthDate: String = ""
  var birthPlace: String = ""
  var height: String = ""
  var weight: String = ""
  
  //contact details
  var phone: String = ""
  var email: String = ""
  
  //address details
  var streeAddress: String = ""
  var zipCode: String = ""
  var city: String = ""
  
  //work details
  var companyName: String = ""
  var designation: String = ""
  var annualIncome: String = ""
  
  //empty constructor
  init() { }
}

//PersonBuilder class helps to construct the person class instance
class PersonBuilder {
  var person: Person
  init(person: Person){
    self.person = person
  }
  
  //personal details builder switching
  var personalInfo: PersonPersonalDetailsBuilder {
    return PersonPersonalDetailsBuilder(person: self.person)
  }
  
  //contact details builder switching
  var contacts: PersonContactDetailsBuilder {
    return PersonContactDetailsBuilder(person: self.person)
  }
  
  //address details builder switching
  var lives: PersonAddressDetailsBuilder {
    return PersonAddressDetailsBuilder(person: self.person)
  }
  
  //work details builder switching
  var works: PersonCompanyDetailsBuilder {
    return PersonCompanyDetailsBuilder(person: self.person)
  }
  
  func build() -> Person {
    return self.person
  }
}

//PersonPersonalDetailsBuilder: update personal details
class PersonPersonalDetailsBuilder: PersonBuilder {
  func nameIs(_ name: String) -> Self {
    self.person.name = name
    return self
  }
  func genderIs(_ gender: String) -> Self {
    self.person.gender = gender
    return self
  }
  func bornOn(_ birthDate: String) -> Self {
    self.person.birthDate = birthDate
    return self
  }
  func bornAt(_ birthPlace: String) -> Self {
    self.person.birthPlace = birthPlace
    return self
  }
  func havingHeight(_ height: String) -> Self {
    self.person.height = height
    return self
  }
  func havingWeight(_ weight: String) -> Self {
    self.person.weight = weight
    return self
  }
}

//PersonContactDetailsBuilder: update contact details
class PersonContactDetailsBuilder: PersonBuilder {
  func hasPhone(_ phone: String) -> Self {
    self.person.phone = phone
    return self
  }
  func hasEmail(_ email: String) -> Self {
    self.person.email = email
    return self
  }
}

//PersonAddressDetailsBuilder: update address details
class PersonAddressDetailsBuilder: PersonBuilder {
  func at(_ streeAddress: String) -> Self {
    self.person.streeAddress = streeAddress
    return self
  }
  func withZipCode(_ zipCode: String) -> Self {
    self.person.zipCode = zipCode
    return self
  }
  func inCity(_ city: String) -> Self {
    self.person.city = city
    return self
  }
}

//PersonCompanyDetailsBuilder: update company details
class PersonCompanyDetailsBuilder: PersonBuilder {
  func inCompany(_ companyName: String) -> Self {
    self.person.companyName = companyName
    return self
  }
  func asA(_ designation: String) -> Self {
    self.person.designation = designation
    return self
  }
  func hasAnnualEarning(_ annualIncome: String) -> Self {
    self.person.annualIncome = annualIncome
    return self
  }
}

/* Console output:
 
 Hitendra Solanki has contact number +91 90333-71772 and email hitendra.developer@gmail.com
 Hitendra Solanki works in Fortune 500 compay as a Software architect.
 
 */