Stabilise configuration and documentation of UUID factory.

[lgpl/argeo-commons.git] / org.argeo.api.uuid / src / org / argeo / api / uuid / MacAddressUuidFactory.java

diff --git a/org.argeo.api.uuid/src/org/argeo/api/uuid/MacAddressUuidFactory.java b/org.argeo.api.uuid/src/org/argeo/api/uuid/MacAddressUuidFactory.java
index d1ce6ded851ded57825c20be3158498f32281f3e..39c919fa6d36976bed0439a0b2a2c22138ecf41b 100644 (file)
--- a/org.argeo.api.uuid/src/org/argeo/api/uuid/MacAddressUuidFactory.java
+++ b/org.argeo.api.uuid/src/org/argeo/api/uuid/MacAddressUuidFactory.java
@@ -1,15 +1,44 @@
 package org.argeo.api.uuid;
 
+import java.net.InetAddress;
+import java.net.NetworkInterface;
+import java.net.SocketException;
+import java.net.UnknownHostException;
+import java.util.UUID;
+
+/**
+ * An {@link UUID} factory whose node id (for time based UUIDs) is the hardware
+ * MAC address as specified in RFC4122.
+ * 
+ * @see https://datatracker.ietf.org/doc/html/rfc4122.html#section-4.1.6
+ */
 public class MacAddressUuidFactory extends ConcurrentUuidFactory {
        public final static UuidFactory DEFAULT = new MacAddressUuidFactory();
 
        public MacAddressUuidFactory() {
-               setNodeIdSupplier(() -> {
-                       byte[] hardwareAddress = getHardwareAddress();
-                       byte[] macAddressNodeId = toNodeIdBytes(hardwareAddress, 0);
-                       long nodeIdBase = NodeIdSupplier.toNodeIdBase(macAddressNodeId);
-                       return nodeIdBase;
-               });
+               super(localHardwareAddressAsNodeId(), 0);
+       }
+
+       public static byte[] localHardwareAddressAsNodeId() {
+               InetAddress localHost;
+               try {
+                       localHost = InetAddress.getLocalHost();
+                       NetworkInterface nic = NetworkInterface.getByInetAddress(localHost);
+                       return hardwareAddressToNodeId(nic);
+               } catch (UnknownHostException | SocketException e) {
+                       throw new IllegalStateException(e);
+               }
+
+       }
+
+       public static byte[] hardwareAddressToNodeId(NetworkInterface nic) throws SocketException {
+               byte[] hardwareAddress = nic.getHardwareAddress();
+               final int length = 6;
+               byte[] arr = new byte[length];
+               for (int i = 0; i < length; i++) {
+                       arr[i] = hardwareAddress[length - 1 - i];
+               }
+               return arr;
        }
 
 }