带有接收者的 SAM 编译器插件
The sam-with-receiver compiler plugin makes the first parameter of the annotated Java “single abstract method” (SAM) interface method a receiver in Kotlin. This conversion only works when the SAM interface is passed as a Kotlin lambda, both for SAM adapters and SAM constructors (see the SAM conversions documentation for more details).
Here is an example:
public @interface SamWithReceiver {}
@SamWithReceiver
public interface TaskRunner {
void run(Task task);
}
fun test(context: TaskContext) {
val runner = TaskRunner {
// Here 'this' is an instance of 'Task'
println("$name is started")
context.executeTask(this)
println("$name is finished")
}
}
Gradle
The usage is the same to all-open and no-arg, except the fact that sam-with-receiver does not have any built-in presets, and you need to specify your own list of special-treated annotations.
plugins {
id("org.jetbrains.kotlin.plugin.sam.with.receiver") version "$kotlin_version"
}
Then specify the list of SAM-with-receiver annotations:
samWithReceiver {
annotation("com.my.SamWithReceiver")
}
Maven
<plugin>
<artifactId>kotlin-maven-plugin</artifactId>
<groupId>org.jetbrains.kotlin</groupId>
<version>${kotlin.version}</version>
<configuration>
<compilerPlugins>
<plugin>sam-with-receiver</plugin>
</compilerPlugins>
<pluginOptions>
<option>
sam-with-receiver:annotation=com.my.SamWithReceiver
</option>
</pluginOptions>
</configuration>
<dependencies>
<dependency>
<groupId>org.jetbrains.kotlin</groupId>
<artifactId>kotlin-maven-sam-with-receiver</artifactId>
<version>${kotlin.version}</version>
</dependency>
</dependencies>
</plugin>
Command-line compiler
Add the plugin JAR file to the compiler plugin classpath and specify the list of sam-with-receiver annotations:
-Xplugin=$KOTLIN_HOME/lib/sam-with-receiver-compiler-plugin.jar
-P plugin:org.jetbrains.kotlin.samWithReceiver:annotation=com.my.SamWithReceiver