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Builder.kt
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Builder.kt
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import org.junit.jupiter.api.Test
import java.io.File
// Let's assume that Dialog class is provided by external library.
// We have only access to Dialog public interface which cannot be changed.
class Dialog {
fun setTitle(text: String) = println("setting title text $text")
fun setTitleColor(color: String) = println("setting title color $color")
fun setMessage(text: String) = println("setting message $text")
fun setMessageColor(color: String) = println("setting message color $color")
fun setImage(bitmapBytes: ByteArray) = println("setting image with size ${bitmapBytes.size}")
fun show() = println("showing dialog $this")
}
// Builder
class DialogBuilder() {
constructor(init: DialogBuilder.() -> Unit) : this() {
init()
}
private var titleHolder: TextView? = null
private var messageHolder: TextView? = null
private var imageHolder: File? = null
fun title(attributes: TextView.() -> Unit) {
titleHolder = TextView().apply { attributes() }
}
fun message(attributes: TextView.() -> Unit) {
messageHolder = TextView().apply { attributes() }
}
fun image(attributes: () -> File) {
imageHolder = attributes()
}
fun build(): Dialog {
println("build")
val dialog = Dialog()
titleHolder?.apply {
dialog.setTitle(text)
dialog.setTitleColor(color)
}
messageHolder?.apply {
dialog.setMessage(text)
dialog.setMessageColor(color)
}
imageHolder?.apply {
dialog.setImage(readBytes())
}
return dialog
}
class TextView {
var text: String = ""
var color: String = "#00000"
}
}
//Function that creates dialog builder and builds Dialog
fun dialog(init: DialogBuilder.() -> Unit): Dialog =
DialogBuilder(init).build()
class BuilderTest {
@Test
fun Builder() {
println("Build dialog")
val dialog: Dialog =
dialog {
title {
text = "Dialog Title"
}
message {
text = "Dialog Message"
color = "#333333"
}
image {
File.createTempFile("image", "jpg")
}
}
println("Show dialog")
dialog.show()
}
}