https://github.com/rommansabbir/builderpatternexample-kotlin
Simple builder pattern design example in Kotlin
https://github.com/rommansabbir/builderpatternexample-kotlin
Last synced: about 2 months ago
JSON representation
Simple builder pattern design example in Kotlin
- Host: GitHub
- URL: https://github.com/rommansabbir/builderpatternexample-kotlin
- Owner: rommansabbir
- Created: 2019-08-23T06:46:32.000Z (over 5 years ago)
- Default Branch: master
- Last Pushed: 2019-08-23T17:20:42.000Z (over 5 years ago)
- Last Synced: 2025-01-30T15:16:56.230Z (4 months ago)
- Language: Kotlin
- Size: 2.93 KB
- Stars: 0
- Watchers: 2
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
Awesome Lists containing this project
README
#### Let's assume, you are a customer & you want service from a service provider.
So, forgetting service from a service provider you need some basic information which will be sent to the provider, right?
so that the provider can understand what kind of service you want.
OK, let's break down our service request. We have 6 unique information against a request. Those are
* ``Service Name (required)``
* ``Request Location (required)``
* ``Request Time (required)``
* ``Booking Fee (required)``
* ``Total Amount (optional)``
* ``Description (optional)``
We can send a request to the provider in 2 ways, one is writing request for every time when you need to get a service (which is a bad practice).
Another one is to use a builder, who will build a request object for us for every single request.
As we can see that ``Service Name``, ``Request Location``, ``Request Time``, ``Booking Fee`` is required for the request, we can also provide some additional information to the provider.
Let's take a look at the code:
``````
package servicerequest
import java.util.*
class ServiceRequest(serviceRequestBuilder: ServiceRequestBuilder) {
/**
* All necessary data for a single [ServiceRequest] object
*/
private var serviceName : String? = null
private var requestTime : Date = Calendar.getInstance().time
private var requestLocation : Location? = null
private var bookingFee : Double? = null
private var totalAmount : Double? = null
private var description : String? = null
/**
* Initialize required values
*/
init {
this.serviceName = serviceRequestBuilder.serviceName
this.requestTime = serviceRequestBuilder.requestTime
this.requestLocation = serviceRequestBuilder.requestLocation
this.bookingFee = serviceRequestBuilder.bookingFee
this.totalAmount = serviceRequestBuilder.totalAmount
this.description = serviceRequestBuilder.description
}
override fun toString(): String {
return "Service Name: $serviceName, Location : ${requestLocation.toString()}, Date: ${requestTime.toString()}, Booking Fee: ${bookingFee.toString()}, Total Amount: $totalAmount, Description: $description"
}
/**
* Pass required data through constructor
*/
class ServiceRequestBuilder(val serviceName: String, val requestLocation : Location, val bookingFee : Double){
/**
* All required data for a single [ServiceRequest] object
*/
var requestTime : Date = Calendar.getInstance().time
var totalAmount : Double? = null
var description : String? = null
/**
* Set total amount to [ServiceRequest] object
* @param totalAmount, Total amount
*/
fun totalAmount(totalAmount : Double) : ServiceRequestBuilder{
this.totalAmount = totalAmount
return this
}
/**
* Set description to [ServiceRequest] object
* @param description, Description
*/
fun description(description : String) : ServiceRequestBuilder{
this.description = description
return this
}
/**
* New build the request object
* @return [ServiceRequest]
*/
fun build() : ServiceRequest{
return ServiceRequest(this)
}
}
}
``````