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kotlin-result
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Omit "this" prefix from method references 

https://kotlinlang.org/docs/reference/whatsnew12.html#support-for--foo-as-a-shorthand-for-thisfoo
This commit is contained in:
Michael Bull 2018-01-24 12:58:26 +00:00
parent 631f81d8ae
commit 687c4c9d7f
2 changed files with 17 additions and 8 deletions
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2
README.md
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@ -83,7 +83,7 @@ having sufficient privileges, and the command executing the associated action.
```kotlin ```kotlin
tokenize(command.toLowerCase()) tokenize(command.toLowerCase())
.andThen(this::findCommand) .andThen(::findCommand)
.andThen { cmd -> checkPrivileges(loggedInUser, cmd) } .andThen { cmd -> checkPrivileges(loggedInUser, cmd) }
.andThen { execute(user = loggedInUser, command = cmd, timestamp = LocalDateTime.now()) } .andThen { execute(user = loggedInUser, command = cmd, timestamp = LocalDateTime.now()) }
.mapBoth( .mapBoth(

23
example/src/main/kotlin/com/github/michaelbull/result/example/service/CustomerService.kt
View File

@ -1,10 +1,16 @@
package com.github.michaelbull.result.example.service package com.github.michaelbull.result.example.service
import com.github.michaelbull.result.* import com.github.michaelbull.result.Err
import com.github.michaelbull.result.Ok
import com.github.michaelbull.result.Result
import com.github.michaelbull.result.andThen
import com.github.michaelbull.result.example.model.domain.Customer import com.github.michaelbull.result.example.model.domain.Customer
import com.github.michaelbull.result.example.model.domain.CustomerId import com.github.michaelbull.result.example.model.domain.CustomerId
import com.github.michaelbull.result.example.model.domain.DomainMessage import com.github.michaelbull.result.example.model.domain.DomainMessage
import com.github.michaelbull.result.example.model.entity.CustomerEntity import com.github.michaelbull.result.example.model.entity.CustomerEntity
import com.github.michaelbull.result.map
import com.github.michaelbull.result.mapBoth
import com.github.michaelbull.result.mapError
import java.sql.SQLTimeoutException import java.sql.SQLTimeoutException
object CustomerService { object CustomerService {
@ -12,7 +18,7 @@ object CustomerService {
fun getAll(): Result<Collection<Customer>, DomainMessage> { fun getAll(): Result<Collection<Customer>, DomainMessage> {
return Result.of(repository::findAll) return Result.of(repository::findAll)
.mapError(this::exceptionToDomainMessage) .mapError(::exceptionToDomainMessage)
.andThen { result: Collection<CustomerEntity> -> .andThen { result: Collection<CustomerEntity> ->
Ok(result.map { Ok(result.map {
val customer = Customer.from(it) val customer = Customer.from(it)
@ -39,21 +45,24 @@ object CustomerService {
private fun updateCustomer(entity: CustomerEntity, old: Customer, new: Customer) = private fun updateCustomer(entity: CustomerEntity, old: Customer, new: Customer) =
Result.of { repository.update(entity) } Result.of { repository.update(entity) }
.map { differenceBetween(old, new) } .map { differenceBetween(old, new) }
.mapError(this::exceptionToDomainMessage) .mapError(::exceptionToDomainMessage)
private fun createCustomer(entity: CustomerEntity) = private fun createCustomer(entity: CustomerEntity) =
Result.of { repository.insert(entity) } Result.of { repository.insert(entity) }
.mapError(this::exceptionToDomainMessage)
.map { DomainMessage.CustomerCreated } .map { DomainMessage.CustomerCreated }
.mapError(::exceptionToDomainMessage)
private fun findCustomer(customers: Collection<Customer>, id: CustomerId): Result<Customer, DomainMessage.CustomerNotFound> { private fun findCustomer(customers: Collection<Customer>, id: CustomerId): Result<Customer, DomainMessage.CustomerNotFound> {
val customer = customers.find { it.id == id } val customer = customers.find { it.id == id }
return if (customer != null) Ok(customer) else Err(DomainMessage.CustomerNotFound) return if (customer != null) Ok(customer) else Err(DomainMessage.CustomerNotFound)
} }
private fun differenceBetween(old: Customer, new: Customer) = when { private fun differenceBetween(old: Customer, new: Customer): DomainMessage.EmailAddressChanged? {
new.email != old.email -> DomainMessage.EmailAddressChanged(old.email.address, new.email.address) return if (new.email != old.email) {
else -> null DomainMessage.EmailAddressChanged(old.email.address, new.email.address)
} else {
null
}
} }
private fun exceptionToDomainMessage(t: Throwable) = when (t) { private fun exceptionToDomainMessage(t: Throwable) = when (t) {