X-Git-Url: https://git.argeo.org/?a=blobdiff_plain;f=org.argeo.api.uuid%2Fsrc%2Forg%2Fargeo%2Fapi%2Fuuid%2FTimeUuid.java;h=2e0587d12748128445ee3b81b64439fa8b6a59f2;hb=369abbec35158f11bcca3651c1c3f2f7d6652226;hp=2f3a73fffc7c4cfd4af511557ef29cdfe0a18bb1;hpb=e8e2c65f356b30b35e4d8a1de66691a789c183bb;p=lgpl%2Fargeo-commons.git

diff --git a/org.argeo.api.uuid/src/org/argeo/api/uuid/TimeUuid.java b/org.argeo.api.uuid/src/org/argeo/api/uuid/TimeUuid.java
index 2f3a73fff..2e0587d12 100644
--- a/org.argeo.api.uuid/src/org/argeo/api/uuid/TimeUuid.java
+++ b/org.argeo.api.uuid/src/org/argeo/api/uuid/TimeUuid.java
@@ -18,6 +18,7 @@ public class TimeUuid extends TypedUuid {
 	 */
 	public final static Instant TIMESTAMP_ZERO = ZonedDateTime.of(1582, 10, 15, 0, 0, 0, 0, ZoneOffset.UTC).toInstant();
 
+	/** Constructor based on a {@link UUID}. */
 	public TimeUuid(UUID uuid) {
 		super(uuid);
 		if (uuid.version() != 1 && uuid.variant() != 2)
@@ -75,4 +76,23 @@ public class TimeUuid extends TypedUuid {
 		Duration duration = Duration.between(TimeUuid.TIMESTAMP_ZERO, instant);
 		return durationToTimestamp(duration);
 	}
+
+	/**
+	 * Crate a time UUID with this instant as timestamp and clock and node id set to
+	 * zero.
+	 */
+	public static UUID fromInstant(Instant instant) {
+		long timestamp = instantToTimestamp(instant);
+		long mostSig = toMostSignificantBits(timestamp);
+		UUID uuid = new UUID(mostSig, UuidFactory.LEAST_SIG_RFC4122_VARIANT);
+		return uuid;
+	}
+
+	/** Convert timestamp in UUID format to most significant bits of a time UUID. */
+	static long toMostSignificantBits(long timestamp) {
+		long mostSig = UuidFactory.MOST_SIG_VERSION1 | ((timestamp & 0xFFFFFFFFL) << 32) // time_low
+				| (((timestamp >> 32) & 0xFFFFL) << 16) // time_mid
+				| ((timestamp >> 48) & 0x0FFFL);// time_hi_and_version
+		return mostSig;
+	}
 }