BaseDocument.fromType constructor

BaseDocument.fromType(String docType, { String? data, TransportableData? signature, })

1. Create a new empty document
2. Create entity document with data and signature loaded from local storage

@param docType - document type

@param data - document data in JsON format

@param signature - signature of document data in Base64 format

Implementation

BaseDocument.fromType(String docType, {String? data, TransportableData? signature}) {

  // document type
  assert(docType.isNotEmpty && docType != '*', 'document type error: $docType');
  this['type'] = docType;

  // document data(Json) & signature(Base64)
  if (data == null || signature == null) {
    assert(data == null && signature == null, 'document data/signature error: $data, $signature');
    // 1. Create a new empty document
    _json = null;
    _sig = null;
    // initialize properties with created time
    _properties = {
      'type': docType,  // deprecated
      'created_time': DateTime.now().millisecondsSinceEpoch / 1000.0,
    };
    _status = 0;
  } else {
    assert(data.isNotEmpty && signature.isNotEmpty, 'document data/signature error: $data, $signature');
    // 2. Create entity document with data and signature loaded from local storage
    this['data'] = data;
    this['signature'] = signature.serialize();
    _json = data;
    _sig = signature;
    _properties = null;  // lazy
    // all documents must be verified before saving into local storage
    _status = 1;
  }
}