Created
March 13, 2016 16:50
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Kotlin Metadata
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package com.github.vmironov | |
import kotlin.reflect.jvm.internal.impl.serialization.ClassData | |
import kotlin.reflect.jvm.internal.impl.serialization.Flags | |
import kotlin.reflect.jvm.internal.impl.serialization.ProtoBuf | |
import kotlin.reflect.jvm.internal.impl.serialization.jvm.JvmProtoBufUtil | |
data class Foo(val foo: String) | |
data class Bar(val bar: String) | |
object FooFoo | |
object BarBar | |
fun main(args: Array<String>) { | |
println("Foo is data? ${isDataClass(Foo::class.java)}") | |
println("Bar is data? ${isDataClass(Bar::class.java)}") | |
println("FooFoo is object? ${isObjectClass(FooFoo::class.java)}") | |
println("BarBar is object? ${isObjectClass(FooFoo::class.java)}") | |
} | |
@Suppress("UNCHECKED_CAST") | |
fun getMetadata(target: Class<*>): ClassData? { | |
val metadata = target.declaredAnnotations.singleOrNull { | |
it.annotationClass.java.name == "kotlin.Metadata" | |
} ?: return null | |
val clazz = metadata.javaClass | |
val d1 = clazz.getDeclaredMethod("d1").invoke(metadata) as? Array<String> | |
val d2 = clazz.getDeclaredMethod("d2").invoke(metadata) as? Array<String> | |
if (d1 == null || d2 == null) { | |
return null | |
} | |
return JvmProtoBufUtil.readClassDataFrom(d1, d2) | |
} | |
fun isDataClass(target: Class<*>): Boolean { | |
return getMetadata(target)?.let { | |
Flags.IS_DATA.get(it.classProto.flags) | |
} ?: false | |
} | |
fun isObjectClass(target: Class<*>): Boolean { | |
return getMetadata(target)?.let { | |
Flags.CLASS_KIND.get(it.classProto.flags) == ProtoBuf.Class.Kind.OBJECT | |
} ?: false | |
} | |
fun isCompanionClass(target: Class<*>): Boolean { | |
return getMetadata(target)?.let { | |
Flags.CLASS_KIND.get(it.classProto.flags) == ProtoBuf.Class.Kind.COMPANION_OBJECT | |
} ?: false | |
} |
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