Package io.realm

Enum ImportFlag

    • Enum Constant Detail


        public static final ImportFlag CHECK_SAME_VALUES_BEFORE_SET
        With this flag enabled, fields will not be written to the Realm file if they contain the same value as the value already present in the Realm.

        For local Realms this only has an impact on change listeners which will not report changes to those fields that was not written.

        For synchronized Realms this also impacts the server, which will see improved performance as there is less changes to upload and merge into the server Realm.

        It also impact how the server merges changes from different devices. Realm uses a last-write-wins approach when merging individual fields in an object, so if a field is not written it will be considered "older" than other fields modified.


        1. Server starts out with (Field A = 1, Field B = 1)
        2. Device 1 writes (Field A = 2, Field B = 2).
        3. Device 2 writes (Field A = 3, Field B = 1) but ignores (Field B = 1), because that is the value in the Realm file at this point.
        4. Device 1 uploads its changes to the server making the server (Field A = 2, Field B = 2). Then Device 2 uploads its changes. Due to last-write-wins, the server version now becomes (Field A = 3, Field B = 2).
        This is normally the desired behaviour as the final object is the merged result of the latest changes from both devices, however if all the fields in an object are considered an atomic unit, then this flag should not be set as it will ensure that all fields are set and thus have the same "age" when data are sent to the server.
        See Also:
        Docs on conflict resolution
    • Method Detail

      • values

        public static ImportFlag[] values()
        Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:
        for (ImportFlag c : ImportFlag.values())
        an array containing the constants of this enum type, in the order they are declared
      • valueOf

        public static ImportFlag valueOf​(String name)
        Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)
        name - the name of the enum constant to be returned.
        the enum constant with the specified name
        IllegalArgumentException - if this enum type has no constant with the specified name
        NullPointerException - if the argument is null