toString method

@override String toString()

A string representation of this object.

Some classes have a default textual representation, often paired with a static parse function (like int.parse). These classes will provide the textual representation as their string representation.

Other classes have no meaningful textual representation that a program will care about. Such classes will typically override toString to provide useful information when inspecting the object, mainly for debugging or logging.

Implementation

@override
String toString() {
  List<String> values;

  if (hasDirective(CacheControlDirective.noCache)) {
    values = <String>[
      'no-cache',
      if (hasDirective(CacheControlDirective.noStore)) 'no-store',
      if (hasDirective(CacheControlDirective.noTransform)) 'no-transform',
      'max-age=0',
    ];
  } else {
    values = <String>[];

    if (hasDirective(CacheControlDirective.private)) {
      values.add('private');
    } else if (hasDirective(CacheControlDirective.public)) {
      values.add('public');
    }

    if (hasDirective(CacheControlDirective.noStore)) {
      values.add('no-store');
    }

    if (hasDirective(CacheControlDirective.noTransform)) {
      values.add('no-transform');
    }

    if (hasDirective(CacheControlDirective.mustRevalidate)) {
      values.add('must-revalidate');
    }

    var maxAgeSecs = maxAge.inSeconds;
    values.add('max-age=$maxAgeSecs');

    var staleAgeSecs = staleAge.inSeconds;
    if (staleAgeSecs < maxAgeSecs) {
      staleAgeSecs = maxAgeSecs;
    }

    var staleIfErrorAgeSecs = staleIfErrorAge.inSeconds;
    if (staleIfErrorAgeSecs < maxAgeSecs) {
      staleIfErrorAgeSecs = maxAgeSecs;
    }

    if (hasDirective(CacheControlDirective.staleWhileRevalidate)) {
      values.add('stale-while-revalidate=$staleAgeSecs');
    }

    if (hasDirective(CacheControlDirective.staleIfError)) {
      values.add('stale-if-error=$staleIfErrorAgeSecs');
    }
  }

  return values.join(', ');
}