feat: SingleObjectEncodedBytes as simple class

avro-kotlin/src/main/kotlin/value/SingleObjectEncodedBytes.kt

@@ -6,9 +6,11 @@ import java.nio.ByteBuffer
 /**
  * Message encoded as [Single Object](https://avro.apache.org/docs/current/spec.html#single_object_encoding) ByteArray.
  */
-@JvmInline
-value class SingleObjectEncodedBytes private constructor(
-  private val pair: Pair<AvroFingerprint, BinaryEncodedBytes>
+class SingleObjectEncodedBytes private constructor(
+  /**
+   * The complete single object encoded bytes including marker bytes, fingerprint and payload.
+   */
+  override val value: ByteArray
 ) : ByteArrayValueType {
 
   companion object {
@@ -24,7 +26,7 @@ value class SingleObjectEncodedBytes private constructor(
     val AVRO_HEADER_LENGTH = AvroHeaderBytes.size + Long.SIZE_BYTES
 
     /**
-     * @param the byteArray to verify
+     * @param The byteArray to verify.
      * @return the same byteArray for fluent usage
      * @throws BadHeaderException if byteArray does to start with V1_HEADER or is too short to contain a fingerprint.
      */
@@ -35,10 +37,7 @@ value class SingleObjectEncodedBytes private constructor(
       }
     })
 
-    fun of(bytes: ByteArrayValue) = SingleObjectEncodedBytes(
-      fingerprint = AvroFingerprint.of(bytes),
-      payload = BinaryEncodedBytes(bytes.value.copyOfRange(AVRO_HEADER_LENGTH, bytes.value.size))
-    )
+    fun of(bytes: ByteArrayValue) = SingleObjectEncodedBytes(bytes.value).also { requireNotNull(it.fingerprint) }
 
     fun of(bytes: ByteBuffer) = of(ByteArrayValue(bytes))
 
@@ -47,31 +46,23 @@ value class SingleObjectEncodedBytes private constructor(
     fun of(bytes: ByteArray) = of(ByteArrayValue(bytes))
   }
 
-  constructor(fingerprint: AvroFingerprint, payload: BinaryEncodedBytes) : this(fingerprint to payload)
-
-  override val value: ByteArray get() = AvroHeaderBytes.value + fingerprint.byteValue.value + payload.value
-
-  override val hex: HexString
-    get() = super.hex
-  override val buffer: ByteBuffer
-    get() = super.buffer
-  override val size: Int
-    get() = super.size
-
-  override fun get(index: Int): Byte {
-    return super.get(index)
+  constructor(fingerprint: AvroFingerprint, payload: BinaryEncodedBytes) : this(value = AvroHeaderBytes.value + fingerprint.byteValue.value + payload.value) {
+    require(this.fingerprint == fingerprint)
   }
 
+  override val hex: HexString by lazy { HexString.of(value) }
+
   /**
-   * The [AvroFingerprint] of this encoded byte array.
+   * Memoized for access.
+   * @return The schema fingerprint (as included in value(2,10)).
    */
-  val fingerprint: AvroFingerprint get() = pair.first
+  val fingerprint: AvroFingerprint by lazy { AvroFingerprint.of(bytes = ByteArrayValue(value)) }
 
   /**
-   * The payload of this encoded byte array.
+   * The message payload, binary encoded (value(11,end)).
+   * @return copy of relevant bytes
    */
-  val payload: BinaryEncodedBytes get() = pair.second
-
+  val payload: BinaryEncodedBytes get() = BinaryEncodedBytes(value.copyOfRange(AVRO_HEADER_LENGTH, value.size))
 
   override fun toString() = hex.formatted
 }

avro-kotlin/src/main/kotlin/value/_value-ktx.kt

@@ -36,7 +36,7 @@ interface ByteArrayValueType : ValueType<ByteArray>, WithHexString {
    */
   val size: Int get() = value.size
 
-  operator fun get(index: Int) = value[index]
+  operator fun get(index: Int): Byte = value[index]
 }