Support strings and utf8 when decoding enums

centurion-avro/src/main/kotlin/com/sksamuel/centurion/avro/decoders/enums.kt

@@ -2,6 +2,7 @@ package com.sksamuel.centurion.avro.decoders
 
 import org.apache.avro.Schema
 import org.apache.avro.generic.GenericEnumSymbol
+import org.apache.avro.util.Utf8
 import kotlin.reflect.KClass
 
 class EnumDecoder<T : Enum<T>>(kclass: KClass<T>) : Decoder<Enum<T>> {
@@ -20,6 +21,8 @@ class EnumDecoder<T : Enum<T>>(kclass: KClass<T>) : Decoder<Enum<T>> {
       require(schema.type == Schema.Type.ENUM)
       return when (value) {
          is GenericEnumSymbol<*> -> java.lang.Enum.valueOf(j, value.toString())
+         is String -> java.lang.Enum.valueOf(j, value)
+         is Utf8 -> java.lang.Enum.valueOf(j, value.toString())
          else -> error("Unsupported enum type $value")
       }
    }

centurion-avro/src/test/kotlin/com/sksamuel/centurion/avro/decoders/EnumDecoderTest.kt

@@ -0,0 +1,27 @@
+package com.sksamuel.centurion.avro.decoders
+
+import io.kotest.core.spec.style.FunSpec
+import io.kotest.matchers.shouldBe
+import org.apache.avro.Schema
+import org.apache.avro.generic.GenericData
+import org.apache.avro.util.Utf8
+
+class EnumDecoderTest : FunSpec({
+
+   val schema = Schema.createEnum("W", null, null, listOf("Wobble", "Wibble"))
+
+   test("support GenericEnumSymbol") {
+      EnumDecoder(W::class).decode(schema, GenericData.get().createEnum("Wibble", schema)) shouldBe W.Wibble
+   }
+
+   test("support strings") {
+      EnumDecoder(W::class).decode(schema, "Wibble") shouldBe W.Wibble
+   }
+
+   test("support UTF8s") {
+      EnumDecoder(W::class).decode(schema, Utf8("Wibble")) shouldBe W.Wibble
+   }
+
+})
+
+private enum class W { Wibble, Wobble }