Representation of a content type.

abstract class ContentType implements HeaderValue {
  /**
   * Creates a new content type object setting the primary type and
   * sub type.
   */
  factory ContentType([String primaryType = "", String subType = ""]) {
    return new _ContentType(primaryType, subType);
  }

  /**
   * Creates a new content type object from parsing a Content-Type
   * header value. As primary type, sub type and parameter names and
   * values are not case sensitive all these values will be converted
   * to lower case. Parsing this string
   *
   *     text/html; charset=utf-8
   *
   * will create a content type object with primary type [:text:], sub
   * type [:html:] and parameter [:charset:] with value [:utf-8:].
   */
  factory ContentType.fromString(String value) {
    return new _ContentType.fromString(value);
  }

  /**
   * Gets and sets the content type in the form "primaryType/subType".
   */
  String value;

  /**
   * Gets and sets the primary type.
   */
  String primaryType;

  /**
   * Gets and sets the sub type.
   */
  String subType;

  /**
   * Gets and sets the character set.
   */
  String charset;
}