https://developers.google.com/protocol-buffers/protobuf-java/: Core Protocol Buffers library. Protocol Buffers are a way of encoding structured data in an efficient yet extensible format. 
interface com.google.protobuf.GeneratedMessageV3$FieldAccessorTable$SingularFieldAccessor$MethodInvoker
  minor version: 0
  major version: 59
  flags: flags: (0x0600) ACC_INTERFACE, ACC_ABSTRACT
  this_class: com.google.protobuf.GeneratedMessageV3$FieldAccessorTable$SingularFieldAccessor$MethodInvoker
  super_class: java.lang.Object
{
  public abstract java.lang.Object get(com.google.protobuf.GeneratedMessageV3);
    descriptor: (Lcom/google/protobuf/GeneratedMessageV3;)Ljava/lang/Object;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
         Name  Flags
      message  final

  public abstract  get(com.google.protobuf.GeneratedMessageV3$Builder<?>);
    descriptor: (Lcom/google/protobuf/GeneratedMessageV3$Builder;)Ljava/lang/Object;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Signature: (Lcom/google/protobuf/GeneratedMessageV3$Builder<*>;)Ljava/lang/Object;
    MethodParameters:
         Name  Flags
      builder  

  public abstract int getOneofFieldNumber(com.google.protobuf.GeneratedMessageV3);
    descriptor: (Lcom/google/protobuf/GeneratedMessageV3;)I
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
         Name  Flags
      message  final

  public abstract int getOneofFieldNumber(com.google.protobuf.GeneratedMessageV3$Builder<?>);
    descriptor: (Lcom/google/protobuf/GeneratedMessageV3$Builder;)I
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Signature: (Lcom/google/protobuf/GeneratedMessageV3$Builder<*>;)I
    MethodParameters:
         Name  Flags
      builder  final

  public abstract void set(com.google.protobuf.GeneratedMessageV3$Builder<?>, );
    descriptor: (Lcom/google/protobuf/GeneratedMessageV3$Builder;Ljava/lang/Object;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Signature: (Lcom/google/protobuf/GeneratedMessageV3$Builder<*>;Ljava/lang/Object;)V
    MethodParameters:
         Name  Flags
      builder  final
      value    final

  public abstract boolean has(com.google.protobuf.GeneratedMessageV3);
    descriptor: (Lcom/google/protobuf/GeneratedMessageV3;)Z
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
         Name  Flags
      message  final

  public abstract boolean has(com.google.protobuf.GeneratedMessageV3$Builder<?>);
    descriptor: (Lcom/google/protobuf/GeneratedMessageV3$Builder;)Z
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Signature: (Lcom/google/protobuf/GeneratedMessageV3$Builder<*>;)Z
    MethodParameters:
         Name  Flags
      builder  

  public abstract void clear(com.google.protobuf.GeneratedMessageV3$Builder<?>);
    descriptor: (Lcom/google/protobuf/GeneratedMessageV3$Builder;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Signature: (Lcom/google/protobuf/GeneratedMessageV3$Builder<*>;)V
    MethodParameters:
         Name  Flags
      builder  final
}
SourceFile: "GeneratedMessageV3.java"
NestHost: com.google.protobuf.GeneratedMessageV3
InnerClasses:
  public abstract Builder = com.google.protobuf.GeneratedMessageV3$Builder of com.google.protobuf.GeneratedMessageV3
  public final FieldAccessorTable = com.google.protobuf.GeneratedMessageV3$FieldAccessorTable of com.google.protobuf.GeneratedMessageV3
  private SingularFieldAccessor = com.google.protobuf.GeneratedMessageV3$FieldAccessorTable$SingularFieldAccessor of com.google.protobuf.GeneratedMessageV3$FieldAccessorTable
  private abstract MethodInvoker = com.google.protobuf.GeneratedMessageV3$FieldAccessorTable$SingularFieldAccessor$MethodInvoker of com.google.protobuf.GeneratedMessageV3$FieldAccessorTable$SingularFieldAccessor