# Enum Class A2AMetadataKey

java.lang.Object
java.lang.Enum<A2AMetadataKey>
com.google.adk.a2a.converters.A2AMetadataKey

All Implemented Interfaces:
  `Serializable, Comparable<A2AMetadataKey>, Constable`

public enum A2AMetadataKey extends Enum<A2AMetadataKey>
Enum for the type of A2A metadata. Adds a prefix used to differentiage ADK-related values stored in Metadata an A2A event.

- ## Nested Class Summary

  ### Nested classes/interfaces inherited from class Enum

  `Enum.EnumDesc<E>`

- ## Enum Constant Summary

  Enum Constants
  Enum Constant
  Description
  `CUSTOM_METADATA`
  `ERROR_CODE`
  `GROUNDING_METADATA`
  `IS_LONG_RUNNING`
  `PARTIAL`
  `TYPE`
  `USAGE_METADATA`

- ## Method Summary

  Modifier and Type
  Method
  Description
  `String`
  `getType()`
  `static A2AMetadataKey`
  `valueOf(String name)`
  Returns the enum constant of this class with the specified name.
  `static A2AMetadataKey[]`
  `values()`
  Returns an array containing the constants of this enum class, in the order they are declared.

  ### Methods inherited from class Enum

  `clone, compareTo, describeConstable, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf`

  ### Methods inherited from class Object

  `getClass, notify, notifyAll, wait, wait, wait`

- ## Enum Constant Details

  - ### TYPE

    public static final A2AMetadataKey TYPE

  - ### IS_LONG_RUNNING

    public static final A2AMetadataKey IS_LONG_RUNNING

  - ### PARTIAL

    public static final A2AMetadataKey PARTIAL

  - ### GROUNDING_METADATA

    public static final A2AMetadataKey GROUNDING_METADATA

  - ### USAGE_METADATA

    public static final A2AMetadataKey USAGE_METADATA

  - ### CUSTOM_METADATA

    public static final A2AMetadataKey CUSTOM_METADATA

  - ### ERROR_CODE

    public static final A2AMetadataKey ERROR_CODE

- ## Method Details

  - ### values

    public static A2AMetadataKey[] values()
    Returns an array containing the constants of this enum class, in the order they are declared.
    Returns:
      an array containing the constants of this enum class, in the order they are declared

  - ### valueOf

    public static A2AMetadataKey valueOf(String name)
    Returns the enum constant of this class with the specified name. The string must match exactly an identifier used to declare an enum constant in this class. (Extraneous whitespace characters are not permitted.)
    Parameters:
      `name` - the name of the enum constant to be returned.
    Returns:
      the enum constant with the specified name
    Throws:
      `IllegalArgumentException` - if this enum class has no constant with the specified name
      `NullPointerException` - if the argument is null

  - ### getType

    public String getType()