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Merge pull request #823 from hangga/cloning-object
KTLN-351 | Cloning an object in Kotlin | Hangga Aji Sayekti
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‎core-kotlin-modules/core-kotlin-10/src/test/kotlin/com/baeldung/cloningobject/CloningObjectUnitTest.kt

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package com.baeldung.cloningobject
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import org.assertj.core.api.Assertions.assertThat
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import org.junit.jupiter.api.Test
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data class Address(var street: String, var city: String) : Cloneable {
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public override fun clone() = Address(this.street, this.city)
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constructor(address: Address) : this(address.street, address.city)
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fun deepCopy(
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street: String = this.street,
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city: String = this.city,
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) = Address(street, city)
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}
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data class Person(var name: String, var address: Address) : Cloneable {
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public override fun clone() = Person(name, this.address.clone())
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constructor(person: Person) : this(person.name, Address(person.address))
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fun deepCopy(
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name: String = this.name,
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address: Address = this.address.deepCopy(),
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) = Person(name, address)
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}
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data class Company(var name: String, var industry: String, val ceo: Person, val employees: List<Person>) : Cloneable {
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public override fun clone() = Company(name, industry, ceo.clone(), employees.map { it.clone() })
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constructor(company: Company) : this(company.name,
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company.industry,
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Person(company.ceo),
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company.employees.map { Person(it) })
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fun deepCopy(
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name: String = this.name,
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industry: String = this.industry,
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ceo: Person = this.ceo.deepCopy(),
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employees: List<Person> = this.employees.map { it.deepCopy() },
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) = Company(name, industry, ceo, employees)
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}
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data class Organization(var name: String, val headquarters: Address, val companies: List<Company>) : Cloneable {
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public override fun clone() = Organization(name, headquarters.clone(), companies.map { it.clone() })
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constructor(organization: Organization) : this(organization.name,
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Address(organization.headquarters),
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organization.companies.map { Company(it) })
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fun deepCopy(
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name: String = this.name,
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headquarters: Address = this.headquarters.deepCopy(),
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companies: List<Company> = this.companies.map { it.deepCopy() },
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) = Organization(name, headquarters, companies)
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}
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class CloningObjectUnitTest {
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private val personHangga = Person("Hangga Aji Sayekti", Address("Jln. Kemasan No 53", "Yogyakarta"))
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private val personRaihan = Person("Raihan Kusumo", Address("Jln. Cikapayang No. 508", "Medan"))
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private val personLayla = Person("Layla Hinchcliffe", Address("Collins Street", "Melbourne"))
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private val companyBasen = Company("Basen Software", "Tech", personHangga, listOf(personRaihan, personLayla))
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private val personBima = Person("Bima Arya", Address("Jl. Colombo No. 7", "Yogyakarta"))
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private val personDina = Person("Dina Fitriani", Address("Jl. Kaliurang No. 12", "Yogyakarta"))
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private val personCindy = Person("Cindy Claudia", Address("Jl. Atmosukarto No. 1", "Yogyakarta"))
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private val companyKotagede = Company("Kotagede Software", "Tech", personBima, listOf(personCindy, personDina))
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private val organization = Organization("Bekraf", Address("Jalan Medan Merdeka Selatan", "Jakarta"), listOf(companyBasen, companyKotagede))
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private fun modifyOrganization() {
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organization.name = "New Org Name"
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organization.headquarters.city = "New City"
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organization.companies.first().name = "New Company Name"
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organization.companies.first().ceo.name = "New CEO Name"
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organization.companies.first().ceo.address.city = "New CEO Address City Name"
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organization.companies.first().employees.first().name = "New Employee Name"
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organization.companies.first().employees.first().address.city = "New Employee Address City Name"
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}
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@Test
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fun `when cloned object with secondary constructor then proves that deep copy`() {
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val clonedOrganization = Organization(organization)
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modifyOrganization()
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assertThat(clonedOrganization)
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.isNotSameAs(organization)
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assertThat(clonedOrganization.headquarters.city)
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.isNotEqualTo("New City")
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assertThat(clonedOrganization.companies.first().name)
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.isNotEqualTo("New Company Name")
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assertThat(clonedOrganization.companies.first().ceo.name)
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.isNotEqualTo("New CEO Name")
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assertThat(clonedOrganization.companies.first().ceo.address.city)
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.isNotEqualTo("New CEO Address City Name")
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assertThat(clonedOrganization.companies.first().employees.first().name)
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.isNotEqualTo("New Employee Name")
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assertThat(clonedOrganization.companies.first().employees.first().address.city)
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.isNotEqualTo("New Employee Address City Name")
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}
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@Test
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fun `when cloned object with deepCopy() then proves that deep copy`() {
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val clonedOrganization = organization.deepCopy()
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modifyOrganization()
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assertThat(clonedOrganization)
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.isNotSameAs(organization)
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assertThat(clonedOrganization.headquarters.city)
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.isNotEqualTo("New City")
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assertThat(clonedOrganization.companies.first().name)
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.isNotEqualTo("New Company Name")
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assertThat(clonedOrganization.companies.first().ceo.name)
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.isNotEqualTo("New CEO Name")
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assertThat(clonedOrganization.companies.first().ceo.address.city)
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.isNotEqualTo("New CEO Address City Name")
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assertThat(clonedOrganization.companies.first().employees.first().name)
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.isNotEqualTo("New Employee Name")
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assertThat(clonedOrganization.companies.first().employees.first().address.city)
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.isNotEqualTo("New Employee Address City Name")
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}
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@Test
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fun `when cloned object with clone() then proves that deep copy`() {
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val clonedOrganization = organization.clone()
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modifyOrganization()
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assertThat(clonedOrganization)
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.isNotSameAs(organization)
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assertThat(clonedOrganization.headquarters.city)
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.isNotEqualTo("New City")
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assertThat(clonedOrganization.companies.first().name)
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.isNotEqualTo("New Company Name")
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assertThat(clonedOrganization.companies.first().ceo.name)
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.isNotEqualTo("New CEO Name")
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assertThat(clonedOrganization.companies.first().ceo.address.city)
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.isNotEqualTo("New CEO Address City Name")
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assertThat(clonedOrganization.companies.first().employees.first().name)
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.isNotEqualTo("New Employee Name")
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assertThat(clonedOrganization.companies.first().employees.first().address.city)
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.isNotEqualTo("New Employee Address City Name")
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}
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@Test
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fun `when cloned object with copy() then proves that shallow copy`() {
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val clonedOrganization = organization.copy()
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modifyOrganization()
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assertThat(clonedOrganization)
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.isNotSameAs(organization)
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assertThat(clonedOrganization.headquarters.city)
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.isEqualTo("New City")
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assertThat(clonedOrganization.companies.first().name)
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.isEqualTo("New Company Name")
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assertThat(clonedOrganization.companies.first().ceo.name)
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.isEqualTo("New CEO Name")
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assertThat(clonedOrganization.companies.first().ceo.address.city)
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.isEqualTo("New CEO Address City Name")
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assertThat(clonedOrganization.companies.first().employees.first().name)
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.isEqualTo("New Employee Name")
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assertThat(clonedOrganization.companies.first().employees.first().address.city)
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.isEqualTo("New Employee Address City Name")
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}
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@Test
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fun `when cloned object with copy() then proves that deep copy`() {
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val clonedOrganization = organization.copy(
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headquarters = organization.headquarters.copy(),
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companies = organization.companies.map { company ->
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company.copy(
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ceo = company.ceo.copy(
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address = company.ceo.address.copy()
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),
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employees = company.employees.map { employee ->
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employee.copy(
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address = employee.address.copy()
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)
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}
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)
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}
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)
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modifyOrganization()
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assertThat(clonedOrganization)
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.isNotSameAs(organization)
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assertThat(clonedOrganization.headquarters.city)
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.isNotEqualTo("New City")
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assertThat(clonedOrganization.companies.first().name)
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.isNotEqualTo("New Company Name")
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assertThat(clonedOrganization.companies.first().ceo.name)
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.isNotEqualTo("New CEO Name")
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assertThat(clonedOrganization.companies.first().ceo.address.city)
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.isNotEqualTo("New CEO Address City Name")
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assertThat(clonedOrganization.companies.first().employees.first().name)
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.isNotEqualTo("New Employee Name")
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assertThat(clonedOrganization.companies.first().employees.first().address.city)
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.isNotEqualTo("New Employee Address City Name")
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}
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}

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