Class HeaderTemplate

core/src/main/java/feign/template/HeaderTemplate.java:36–181

Template for HTTP Headers. Variables that are unresolved are ignored and Literals are not encoded.

 * encoded.
 */
public final class HeaderTemplate {

  private final String name;
  private final List<Template> values = new CopyOnWriteArrayList<>();

  public static HeaderTemplate create(String name, Iterable<String> values) {
    if (name == null || name.isEmpty()) {
      throw new IllegalArgumentException("name is required.");
    }

    if (values == null) {
      throw new IllegalArgumentException("values are required");
    }

    return new HeaderTemplate(name, values, Util.UTF_8);
  }

  public static HeaderTemplate literal(String name, Iterable<String> values) {
    if (name == null || name.isEmpty()) {
      throw new IllegalArgumentException("name is required.");
    }

    if (values == null) {
      throw new IllegalArgumentException("values are required");
    }

    return new HeaderTemplate(name, values, Util.UTF_8, true);
  }

  /**
   * Append values to a Header Template.
   *
   * @param headerTemplate to append to.
   * @param values to append.
   * @return a new Header Template with the values added.
   */
  public static HeaderTemplate append(HeaderTemplate headerTemplate, Iterable<String> values) {
    LinkedHashSet<String> headerValues = new LinkedHashSet<>(headerTemplate.getValues());
    headerValues.addAll(
        StreamSupport.stream(values.spliterator(), false)
            .filter(Util::isNotBlank)
            .collect(Collectors.toCollection(LinkedHashSet::new)));
    return create(headerTemplate.getName(), headerValues);
  }

  /**
   * Append values to a Header Template, as literals
   *
   * @param headerTemplate to append to.
   * @param values to append.
   * @return a new Header Template with the values added.
   */
  public static HeaderTemplate appendLiteral(
      HeaderTemplate headerTemplate, Iterable<String> values) {
    LinkedHashSet<String> headerValues = new LinkedHashSet<>(headerTemplate.getValues());
    headerValues.addAll(
        StreamSupport.stream(values.spliterator(), false)
            .filter(Util::isNotBlank)