@Test(expectedExceptions = IllegalArgumentException.class)
 public void testMustBeMap() {
   BindMapToHeadersWithPrefix binder = new BindMapToHeadersWithPrefix("prefix:");
   HttpRequest request = HttpRequest.builder().method("POST").endpoint("http://localhost").build();
   ;
   binder.bindToRequest(request, new File("foo"));
 }
  @Test
  public void testCorrect() throws SecurityException, NoSuchMethodException {

    HttpRequest request = HttpRequest.builder().method("GET").endpoint("http://momma").build();
    BindMapToHeadersWithPrefix binder = new BindMapToHeadersWithPrefix("prefix:");

    assertEquals(
        binder.bindToRequest(request, ImmutableMap.of("imageName", "foo", "serverId", "2")),
        HttpRequest.builder()
            .method("GET")
            .endpoint("http://momma")
            .addHeader("prefix:imagename", "foo")
            .addHeader("prefix:serverid", "2")
            .build());
  }
  @SuppressWarnings("unchecked")
  @Override
  public <R extends HttpRequest> R bindToRequest(R request, Object input) {
    checkArgument(
        checkNotNull(input, "input") instanceof ObjectMetadata,
        "this binder is only valid for ObjectMetadata!");
    checkNotNull(request, "request");

    ObjectMetadata md = ObjectMetadata.class.cast(input);
    checkArgument(md.getKey() != null, "objectMetadata.getKey() must be set!");

    request = metadataPrefixer.bindToRequest(request, md.getUserMetadata());

    Builder<String, String> headers = ImmutableMultimap.builder();
    if (md.getCacheControl() != null) {
      headers.put(HttpHeaders.CACHE_CONTROL, md.getCacheControl());
    }

    if (md.getContentMetadata().getContentDisposition() != null) {
      headers.put("Content-Disposition", md.getContentMetadata().getContentDisposition());
    }

    if (md.getContentMetadata().getContentEncoding() != null) {
      headers.put("Content-Encoding", md.getContentMetadata().getContentEncoding());
    }

    String contentLanguage = md.getContentMetadata().getContentLanguage();
    if (contentLanguage != null) {
      headers.put(HttpHeaders.CONTENT_LANGUAGE, contentLanguage);
    }

    if (md.getContentMetadata().getContentType() != null) {
      headers.put(HttpHeaders.CONTENT_TYPE, md.getContentMetadata().getContentType());
    } else {
      headers.put(HttpHeaders.CONTENT_TYPE, "binary/octet-stream");
    }

    if (md.getContentMetadata().getContentMD5() != null) {
      headers.put("Content-MD5", base64().encode(md.getContentMetadata().getContentMD5()));
    }

    return (R) request.toBuilder().replaceHeaders(headers.build()).build();
  }
 @Test(expectedExceptions = {NullPointerException.class, IllegalStateException.class})
 public void testNullIsBad() {
   BindMapToHeadersWithPrefix binder = new BindMapToHeadersWithPrefix("prefix:");
   HttpRequest request = HttpRequest.builder().method("GET").endpoint("http://momma").build();
   binder.bindToRequest(request, null);
 }