KnowledgeSnapshot.fromMap constructor

KnowledgeSnapshot.fromMap(Map<String, Object?> map)

Reopens saved passages without tokenization or embedding inference. Graph and typed metadata meanings are reconstructed by upstream OKF.

Implementation

factory KnowledgeSnapshot.fromMap(Map<String, Object?> map) {
  if (map['version'] != 1) {
    throw const FormatException('Unsupported knowledge snapshot version.');
  }
  final original = KnowledgeSnapshot.fromSources(
    Map<String, String>.from(map['sources']! as Map),
    bundleId: map['bundleId']! as String,
    assets: List<String>.from(map['assets']! as List),
  );
  final chunks = (map['chunks']! as List)
      .map((value) => Chunk.fromMap(Map<String, Object?>.from(value as Map)))
      .toList();
  final contexts = Map<String, String>.from(map['contextTexts']! as Map);
  final ids = chunks.map((chunk) => chunk.id).toSet();
  if (ids.length != chunks.length ||
      contexts.length != ids.length ||
      chunks.any(
        (chunk) =>
            !original.conceptPaths.contains(chunk.sourcePath) ||
            !(contexts[chunk.id]?.endsWith(chunk.content) ?? false),
      )) {
    throw const FormatException('Inconsistent saved knowledge passages.');
  }
  return KnowledgeSnapshot._(
    original.bundleId,
    List.unmodifiable(chunks),
    original.graph,
    original._metadata,
    Map.unmodifiable(contexts),
    original.sources,
    original.assets,
  );
}