fromJson static method

FeedEntry? fromJson(Object? json)

Parses toJson output; null for entries this build cannot reproduce (unknown family or hero, a family the recipe's version never shipped, newer engine version).

Implementation

static FeedEntry? fromJson(Object? json) {
  if (json is! Map) return null;
  final kind = json['kind'];
  if (kind == 'hero') {
    final id = json['heroId'];
    if (id is! int || heroById(id) == null) return null;
    return FeedEntry.hero(id);
  }
  if (kind == 'generated') {
    final seed = json['seed'];
    final familyId = json['family'];
    final version = json['engineVersion'];
    if (seed is! int || familyId is! int || version is! int) return null;
    final family = ThemeFamily.fromId(familyId);
    if (family == null || family == ThemeFamily.plain) return null;
    if (!supportedEngineVersions.contains(version)) return null;
    // A recipe for a family that version never shipped cannot be
    // reproduced (placeholder definitions change when it ships).
    if (!familyShippedAt(family, version)) return null;
    final rawIntent = json['intent'];
    final intent = rawIntent == null
        ? null
        : ThemeIntent.fromJson(rawIntent).forEntry;
    if (intent != null && version < firstSteerableEngineVersion) {
      return null;
    }
    return FeedEntry.generated(
      seed: seed & 0xFFFFFFFF,
      family: family,
      engineVersion: version,
      intent: intent == null || intent.isEmpty ? null : intent,
      centred: intent != null && json['centred'] == true,
    );
  }
  return null;
}