initial commit

src/main/java/org/apache/datasketches/kll/KllDoublesHelper.java

@@ -37,7 +37,6 @@
  * @author Kevin Lang
  * @author Alexander Saydakov
  */
-//
 final class KllDoublesHelper {
 
   /**

src/main/java/org/apache/datasketches/kll/KllFloatsHelper.java

@@ -37,7 +37,6 @@
  * @author Kevin Lang
  * @author Alexander Saydakov
  */
-//
 final class KllFloatsHelper {
 
   /**
@@ -485,10 +484,10 @@ private static void populateFloatWorkArrays(
       if (selfPop == 0 && otherPop == 0) { continue; }
       if (selfPop > 0 && otherPop == 0) {
         System.arraycopy(myCurFloatItemsArr, myCurLevelsArr[lvl], workbuf, worklevels[lvl], selfPop);
-      } 
+      }
       else if (selfPop == 0 && otherPop > 0) {
         System.arraycopy(otherFloatItemsArr, otherLevelsArr[lvl], workbuf, worklevels[lvl], otherPop);
-      } 
+      }
       else if (selfPop > 0 && otherPop > 0) {
         mergeSortedFloatArrays(
             myCurFloatItemsArr, myCurLevelsArr[lvl], selfPop,

src/main/java/org/apache/datasketches/kll/KllItemsHelper.java

@@ -39,6 +39,20 @@
 @SuppressWarnings("unchecked")
 final class KllItemsHelper<T> {
 
+  /**
+   * Create Items Array from given item and weight.
+   * Used with weighted update only.
+   * @param item the given item
+   * @param weight the given weight
+   * @return the Items Array.
+   */
+  static <T> T[] createItemsArray(final T item, final int weight) {
+    final int itemsArrLen = Integer.bitCount(weight);
+    final Object[] itemsArr = new Object[itemsArrLen];
+    Arrays.fill(itemsArr, item);
+    return (T[]) itemsArr;
+  }
+
   /**
    * The following code is only valid in the special case of exactly reaching capacity while updating.
    * It cannot be used while merging, while reducing k, or anything else.