Class FormEncoder

form/src/main/java/feign/form/FormEncoder.java:42–135

A Feign's form encoder. @author Artem Labazin

 * @author Artem Labazin
 */
@FieldDefaults(level = PRIVATE, makeFinal = true)
public class FormEncoder implements Encoder {

  private static final String CONTENT_TYPE_HEADER;

  private static final Pattern CHARSET_PATTERN;

  static {
    CONTENT_TYPE_HEADER = "Content-Type";
    CHARSET_PATTERN = Pattern.compile("(?<=charset=)([\\w\\-]+)");
  }

  Encoder delegate;

  Map<ContentType, ContentProcessor> processors;

  /** Constructor with the default Feign's encoder as a delegate. */
  public FormEncoder() {
    this(new DefaultEncoder());
  }

  /**
   * Constructor with specified delegate encoder.
   *
   * @param delegate delegate encoder, if this encoder couldn't encode object.
   */
  public FormEncoder(Encoder delegate) {
    this.delegate = delegate;

    val list =
        asList(new MultipartFormContentProcessor(delegate), new UrlencodedFormContentProcessor());

    processors = new HashMap<ContentType, ContentProcessor>(list.size(), 1.F);
    for (ContentProcessor processor : list) {
      processors.put(processor.getSupportedContentType(), processor);
    }
  }

  @Override
  @SuppressWarnings("unchecked")
  public void encode(Object object, Type bodyType, RequestTemplate template)
      throws EncodeException {
    String contentTypeValue = getContentTypeValue(template.headers());
    val contentType = ContentType.of(contentTypeValue);
    if (processors.containsKey(contentType) == false) {
      delegate.encode(object, bodyType, template);
      return;
    }

    Map<String, Object> data;
    if (object instanceof Map) {
      data = (Map<String, Object>) object;
    } else if (isUserPojo(bodyType)) {
      data = toMap(object);
    } else {
      delegate.encode(object, bodyType, template);
      return;
    }