How to use

AbstractSingleValueEncoder

in

org.springframework.core.codec

@Override
public boolean canEncode(ResolvableType elementType, @Nullable MimeType mimeType) {
  if (super.canEncode(elementType, mimeType)) {
    Class<?> outputClass = elementType.toClass();
    return (outputClass.isAnnotationPresent(XmlRootElement.class) ||
        outputClass.isAnnotationPresent(XmlType.class));
  }
  else {
    return false;
  }
}

@Override
public final Flux<DataBuffer> encode(Publisher<? extends T> inputStream, DataBufferFactory bufferFactory,
    ResolvableType elementType, @Nullable MimeType mimeType, @Nullable Map<String, Object> hints) {
  return Flux.from(inputStream).
      take(1).
      concatMap(t -> encode(t, bufferFactory, elementType, mimeType, hints));
}

@Override
public boolean canEncode(ResolvableType elementType, @Nullable MimeType mimeType) {
  Class<?> clazz = elementType.toClass();
  return (super.canEncode(elementType, mimeType) && Resource.class.isAssignableFrom(clazz));
}

@Override
public final Flux<DataBuffer> encode(Publisher<? extends T> inputStream, DataBufferFactory bufferFactory,
    ResolvableType elementType, @Nullable MimeType mimeType, @Nullable Map<String, Object> hints) {
  return Flux.from(inputStream).
      take(1).
      concatMap(t -> encode(t, bufferFactory, elementType, mimeType, hints));
}

@Override
public boolean canEncode(ResolvableType elementType, @Nullable MimeType mimeType) {
  Class<?> clazz = elementType.toClass();
  return (super.canEncode(elementType, mimeType) && Resource.class.isAssignableFrom(clazz));
}

@Override
public final Flux<DataBuffer> encode(Publisher<? extends T> inputStream, DataBufferFactory bufferFactory,
    ResolvableType elementType, @Nullable MimeType mimeType, @Nullable Map<String, Object> hints) {
  return Flux.from(inputStream).
      take(1).
      concatMap(t -> encode(t, bufferFactory, elementType, mimeType, hints));
}

@Override
public boolean canEncode(ResolvableType elementType, @Nullable MimeType mimeType) {
  if (super.canEncode(elementType, mimeType)) {
    Class<?> outputClass = elementType.toClass();
    return (outputClass.isAnnotationPresent(XmlRootElement.class) ||
        outputClass.isAnnotationPresent(XmlType.class));
  }
  else {
    return false;
  }
}

@Override
public final Flux<DataBuffer> encode(Publisher<? extends T> inputStream, DataBufferFactory bufferFactory,
    ResolvableType elementType, @Nullable MimeType mimeType, @Nullable Map<String, Object> hints) {
  return Flux.from(inputStream).
      take(1).
      concatMap(t -> encode(t, bufferFactory, elementType, mimeType, hints));
}

@Override
public boolean canEncode(ResolvableType elementType, @Nullable MimeType mimeType) {
  if (super.canEncode(elementType, mimeType)) {
    Class<?> outputClass = elementType.resolve(Object.class);
    return (outputClass.isAnnotationPresent(XmlRootElement.class) ||
        outputClass.isAnnotationPresent(XmlType.class));
  }
  else {
    return false;
  }
}

@Override
public boolean canEncode(ResolvableType elementType, @Nullable MimeType mimeType) {
  Class<?> clazz = elementType.toClass();
  return (super.canEncode(elementType, mimeType) && Resource.class.isAssignableFrom(clazz));
}

@Override
public boolean canEncode(ResolvableType elementType, @Nullable MimeType mimeType) {
  if (super.canEncode(elementType, mimeType)) {
    Class<?> outputClass = elementType.toClass();
    return (outputClass.isAnnotationPresent(XmlRootElement.class) ||
        outputClass.isAnnotationPresent(XmlType.class));
  }
  else {
    return false;
  }
}

@Override
public boolean canEncode(ResolvableType elementType, @Nullable MimeType mimeType) {
  Class<?> clazz = elementType.toClass();
  return (super.canEncode(elementType, mimeType) && Resource.class.isAssignableFrom(clazz));
}