public Map transform()

in sdk1/src/main/java/com/amazonaws/services/dynamodbv2/datamodeling/AttributeEncryptor.java [63:95]

19 lines of code
4 McCabe index (conditional complexity)


  public Map<String, AttributeValue> transform(final Parameters<?> parameters) {
    // one map of attributeFlags per model class
    final ModelClassMetadata metadata = getModelClassMetadata(parameters);

    final Map<String, AttributeValue> attributeValues = parameters.getAttributeValues();
    // If this class is marked as "DoNotTouch" then we know our encryptor will not change it at all
    // so we may as well fast-return and do nothing. This also avoids emitting errors when they
    // would not apply.
    if (metadata.doNotTouch) {
      return attributeValues;
    }

    // When AttributeEncryptor is used without SaveBehavior.PUT or CLOBBER, it is trying to
    // transform only a subset
    // of the actual fields stored in DynamoDB. This means that the generated signature will not
    // cover any
    // unmodified fields. Thus, upon untransform, the signature verification will fail as it won't
    // cover all
    // expected fields.
    if (parameters.isPartialUpdate()) {
      throw new DynamoDBMappingException(
          "Use of AttributeEncryptor without SaveBehavior.PUT or SaveBehavior.CLOBBER is an error "
              + "and can result in data-corruption. This occured while trying to save "
              + parameters.getModelClass());
    }

    try {
      return encryptor.encryptRecord(
          attributeValues, metadata.getEncryptionFlags(), paramsToContext(parameters));
    } catch (Exception ex) {
      throw new DynamoDBMappingException(ex);
    }
  }