Merge branch 'JAL-3878_ws-overhaul-3' into mmw/Release_2_12_ws_merge

[jalview.git] / src / jalview / util / MathUtils.java

diff --git a/src/jalview/util/MathUtils.java b/src/jalview/util/MathUtils.java
index 72d46a2..ae0885e 100644 (file)
--- a/src/jalview/util/MathUtils.java
+++ b/src/jalview/util/MathUtils.java
@@ -1,3 +1,23 @@
+/*
+ * Jalview - A Sequence Alignment Editor and Viewer ($$Version-Rel$$)
+ * Copyright (C) $$Year-Rel$$ The Jalview Authors
+ * 
+ * This file is part of Jalview.
+ * 
+ * Jalview is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License 
+ * as published by the Free Software Foundation, either version 3
+ * of the License, or (at your option) any later version.
+ *  
+ * Jalview is distributed in the hope that it will be useful, but 
+ * WITHOUT ANY WARRANTY; without even the implied warranty 
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
+ * PURPOSE.  See the GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with Jalview.  If not, see <http://www.gnu.org/licenses/>.
+ * The Jalview Authors are detailed in the 'AUTHORS' file.
+ */
 package jalview.util;
 
 public class MathUtils
@@ -19,4 +39,17 @@ public class MathUtils
     return gcd(b, a % b);
   }
 
+
+  private static int uidCounter = (int)(Math.random() * 0xffffffff);
+  /**
+   * Generates a unique 64-bit identifier.
+   */
+  public static long getUID()
+  {
+    long uid = 0L;
+    uid |= ((System.currentTimeMillis() >> 10) & 0xfffffffL) << 36;
+    uid |= (long)(Math.random() * 0xfL) << 32;
+    uid |= ++uidCounter & 0xffffffff;
+    return uid;
+  }
 }