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Updates to Delegated Properties article for Kotlin 1.4 (#10220)

This commit is contained in:
Graham Cox 2020-11-07 15:16:21 +00:00 committed by GitHub
parent f579e493d3
commit fa2387c836
2 changed files with 96 additions and 1 deletions
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53
core-kotlin-modules/core-kotlin-lang-oop-2/pom.xml
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@ -22,4 +22,57 @@
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.jetbrains.kotlin</groupId>
<artifactId>kotlin-stdlib-jdk8</artifactId>
<version>${kotlin.version}</version>
</dependency>
<dependency>
<groupId>org.jetbrains.kotlin</groupId>
<artifactId>kotlin-stdlib-jdk7</artifactId>
<version>${kotlin.version}</version>
</dependency>
<dependency>
<groupId>org.jetbrains.kotlin</groupId>
<artifactId>kotlin-stdlib-common</artifactId>
<version>${kotlin.version}</version>
</dependency>
<dependency>
<groupId>org.jetbrains.kotlin</groupId>
<artifactId>kotlin-stdlib</artifactId>
<version>${kotlin.version}</version>
</dependency>
<dependency>
<groupId>org.jetbrains.kotlin</groupId>
<artifactId>kotlin-reflect</artifactId>
<version>${kotlin.version}</version>
</dependency>
<dependency>
<groupId>org.jetbrains.kotlin</groupId>
<artifactId>kotlin-test-junit</artifactId>
<version>${kotlin.version}</version>
</dependency>
<dependency>
<groupId>org.jetbrains.kotlin</groupId>
<artifactId>kotlin-test</artifactId>
<version>${kotlin.version}</version>
</dependency>
<dependency>
<groupId>org.jetbrains.kotlin</groupId>
<artifactId>kotlin-test-common</artifactId>
<version>${kotlin.version}</version>
</dependency>
<dependency>
<groupId>org.jetbrains.kotlin</groupId>
<artifactId>kotlin-test-annotations-common</artifactId>
<version>${kotlin.version}</version>
</dependency>
</dependencies>
</dependencyManagement>
<properties>
<kotlin.version>1.4.10</kotlin.version>
</properties>
</project>

42
core-kotlin-modules/core-kotlin-lang-oop-2/src/test/kotlin/com/baeldung/kotlin/delegates/DelegateProviderTest.kt Normal file
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@ -0,0 +1,42 @@
package com.baeldung.kotlin.delegates
import org.junit.Test
import kotlin.properties.PropertyDelegateProvider
import kotlin.reflect.KProperty
import kotlin.test.assertEquals
class DelegateProvider<in T, D>(private val field: String, private val id: Int)
: PropertyDelegateProvider<T, DatabaseDelegate<T, D>> {
override operator fun provideDelegate(thisRef: T, prop: KProperty<*>): DatabaseDelegate<T, D> {
println("Providing delegate for field $field and ID $id")
prop.returnType.isMarkedNullable
return DatabaseDelegate(field, id)
}
}
class DelegateProvidingUser(val id: Int) {
var name: String by DelegateProvider("name", id)
var age: Int by DelegateProvider("age", id)
}
class DelegateProviderTest {
@Test
fun testGetKnownFields() {
val user = DelegateProvidingUser(1)
assertEquals("George", user.name)
assertEquals(4, user.age)
}
@Test
fun testSetKnownFields() {
val user = DelegateProvidingUser(2)
user.age = 3
assertEquals(3, user.age)
}
@Test(expected = NoRecordFoundException::class)
fun testGetKnownField() {
val user = DelegateProvidingUser(3)
user.name
}
}