Package de.aristaflow.adept2.util

Class UUIDTools

  • public final class UUIDTools
extends Object
    Tool class for creating and managing UUIDs. Always use this class when in need of a UUID.

    • Field Detail

      • FORBIDDEN_LONG

        public static final int FORBIDDEN_LONG
        The constant value that must not occur as part of a created UUID.
        See Also:
        Constant Field Values

      • NON_EXISTING_UUID

        public static final UUID NON_EXISTING_UUID
        The UUID that will never exist, created with the FORBIDDEN_LONG as most and least sig bits.

    • Method Detail

      • createRandomUUIDDebug

        public static UUID createRandomUUIDDebug()
        Creates a consecutive UUID. This is useful for debugging purpose when using instead of a random UUID. The sequence will be reset when loading this class.
        Returns:
        A consecutive UUID for debugging random UUIDs.
        See Also:
        createRandomUUID()

      • createPositiveUUID

        public static UUID createPositiveUUID()
        Creates a random UUID which has a positive sign, that means a special bit for distinguishing two complementary cases. For instance, this can be used for unmodified instances while a modified instance can have a negative UUID.
        Returns:
        A random "positive" UUID.

      • createPositiveUUIDDebug

        public static UUID createPositiveUUIDDebug()
        Creates a consecutive UUID having a positive sign. This is useful for debugging purpose when using instead of a random positive UUID.
        Returns:
        A consecutive "positive" UUID.
        See Also:
        createPositiveUUID()

      • createNegativeRandomUUID

        public static UUID createNegativeRandomUUID()
        Creates a random UUID which has a negative sign, that means a special bit for distinguishing two complementary cases. For instance, this can be used for modified instances while an unmodified instance can have a positive UUID.
        Returns:
        A random "negative" UUID.

      • createNegativeRandomUUIDDebug

        public static UUID createNegativeRandomUUIDDebug()
        Creates a consecutive UUID having a negative sign. This is useful for debugging purpose when using instead of a random negative UUID.
        Returns:
        A consecutive "negative" UUID.
        See Also:
        createNegativeRandomUUID()

      • isNegative

        public static boolean isNegative​(UUID uuid)
        Returns whether the designated UUID is "negative", that is, it has a negative sign (the most significant bits are a negative long value).
        Parameters:
        uuid - The UUID to check whether it is negative.
        Returns:
        Whether the designated UUID is "negative" (the most significant bits are a negative long value).

      • getUnsignedComparator

        public static SerialisableComparator<UUID> getUnsignedComparator()
        Gets a new UUID comparator comparing UUIDs unsigned, that is a leading 7 is less than a leading 8. Signed it would be vice versa since 8 is negative.
        Returns:
        A new UUID comparator comparing UUIDs unsigned