How to use

create

method

in

org.apache.beam.sdk.transforms.reflect.DoFnSignature$FieldAccessDeclaration

private static Map<String, DoFnSignature.FieldAccessDeclaration> analyzeFieldAccessDeclaration(
  ErrorReporter errors, Class<?> fnClazz) {
 Map<String, FieldAccessDeclaration> fieldAccessDeclarations = new HashMap<>();
 for (Field field : declaredFieldsWithAnnotation(DoFn.FieldAccess.class, fnClazz, DoFn.class)) {
  field.setAccessible(true);
  DoFn.FieldAccess fieldAccessAnnotation = field.getAnnotation(DoFn.FieldAccess.class);
  if (!Modifier.isFinal(field.getModifiers())) {
   errors.throwIllegalArgument(
     "Non-final field %s annotated with %s. Field access declarations must be final.",
     field.toString(), DoFn.FieldAccess.class.getSimpleName());
   continue;
  }
  Class<?> fieldAccessRawType = field.getType();
  if (!fieldAccessRawType.equals(FieldAccessDescriptor.class)) {
   errors.throwIllegalArgument(
     "Field %s annotated with %s, but the value was not of type %s",
     field.toString(),
     DoFn.FieldAccess.class.getSimpleName(),
     FieldAccessDescriptor.class.getSimpleName());
  }
  fieldAccessDeclarations.put(
    fieldAccessAnnotation.value(),
    FieldAccessDeclaration.create(fieldAccessAnnotation.value(), field));
 }
 return fieldAccessDeclarations;
}