mehdiyari

/**
 * This is simple processor that use KSP API to generate
 * extension function for annotated classes with [HelloWorldAnnotation]
 */
class HelloWorldProcessor(
    private val logger: KSPLogger,
    private val codeGenerator: CodeGenerator
) : SymbolProcessor {

    override fun process(resolver: Resolver): List<KSAnnotated> {

mehdiyari

@Retention(AnnotationRetention.RUNTIME)
@Target(AnnotationTarget.CLASS)
@SinceKotlin("1.3")
annotation class Metadata(
    @get:JvmName("k") val kind: Int = 1,
    @get:JvmName("mv") val metadataVersion: IntArray = [],
    @get:JvmName("bv") val bytecodeVersion: IntArray = [1, 0, 3],
    @get:JvmName("di") val data1: Array<String> = [],
    @get:JvmName("d2") val data2: Array<String> = [],
    @get:JvmName("xs") val extraString: String = "",

mehdiyari

// Declare Annotation in Kotlin
@Target(AnnotationTarget.CLASS, AnnotationTarget.FUNCTION)
@Retention(AnnotationRetention.SOURCE)
@Repeatable
annotation class HelloWorldAnnotation

mehdiyari

/**
 * This is simple processor that use JSR-269 API and kotlinpoet library to generate
 * extension function for annotated classes with [HelloWorldAnnotation]
 */
class HelloWorldProcessor : AbstractProcessor() {

    override fun process(annotations: MutableSet<out TypeElement>?, roundEnv: RoundEnvironment?): Boolean {
        val typeElement = annotations?.firstOrNull() ?: return false

        for (annotatedElement in roundEnv?.getElementsAnnotatedWith(typeElement) ?: setOf()) {

mehdiyari

/**
 * Simply security manager that check the packages and if equal 
 * to "java.lang.reflect" or "kotlin.reflect" throws [SecurityException]
 */
class AppSecurityManager : SecurityManager() {

    override fun checkPackageAccess(pkg: String?) {
        if (pkg == "java.lang.reflect" || pkg == "kotlin.reflect") {
            throw SecurityException("Reflection is not allowed in this program")
        }

mehdiyari

/**
 * Simple singleton class with double-check pattern
 */
class Singleton private constructor() {

    private val data: String = "data property value"

    @Volatile
    private var singleton: Singleton? = null

mehdiyari

fun main() {
    val singletonKClass = Singleton::class
    singletonKClass.constructors.firstOrNull { it.visibility == KVisibility.PRIVATE }?.also { privateConstructor ->
        /**
         * We give access to private constructor and we can create instance
         * from [Singleton] class [privateConstructor.call] method
         */
        privateConstructor.isAccessible = true
        val singletonNewObject = privateConstructor.call()

mehdiyari

dependencies {
    implementation "org.jetbrains.kotlin:kotlin-reflect:{latest_version}"
}

mehdiyari

import java.math.BigDecimal
import java.nio.ByteBuffer
import java.nio.charset.StandardCharsets
import java.util.*
import java.util.regex.Pattern

/**
 * simple Base85/Ascii85 encoder-decoder for kotlin
 * @see <a href="Base85">https://en.wikipedia.org/wiki/Ascii85</a>
 */