org.argeo.api.uuid/src/org/argeo/api/uuid/RandomUuid.java

   1 package org.argeo.api.uuid;
   2
   3 import java.util.UUID;
   4
   5 /** An opaque variant 2 random {@link UUID} (v4). */
   6 public final class RandomUuid extends TypedUuid {
   7         private static final long serialVersionUID = APM.SERIAL;
   8
   9         /** Constructor based on a {@link UUID}. */
  10         public RandomUuid(UUID uuid) {
  11                 super(uuid);
  12                 if (uuid.version() != 4 && uuid.variant() != 2)
  13                         throw new IllegalArgumentException("The provided UUID is not a time-based UUID.");
  14         }
  15
  16         /**
  17          * Always returns <code>true</code> since random UUIDs are by definition opaque.
  18          */
  19         @Override
  20         public final boolean isOpaque() {
  21                 return true;
  22         }
  23
  24         /** Creates a new {@link RandomUuid} using {@link UUID#randomUUID()}. */
  25         public static RandomUuid newRandomUuid() {
  26                 return new RandomUuid(UUID.randomUUID());
  27         }
  28
  29 }