In scope of ESME-372: Simplify utility code with Scalaz.
git-svn-id: https://svn.apache.org/repos/asf/esme/trunk@1230730 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/server/src/main/scala/org/apache/esme/lib/TagUtils.scala b/server/src/main/scala/org/apache/esme/lib/TagUtils.scala
index 433e589..2a73ce0 100644
--- a/server/src/main/scala/org/apache/esme/lib/TagUtils.scala
+++ b/server/src/main/scala/org/apache/esme/lib/TagUtils.scala
@@ -19,6 +19,9 @@
package org.apache.esme.lib
+import scalaz._
+import Scalaz._
+
object TagUtils {
// Normalize the frequencies from arbitrary Integers to the range (0.0 - 1.0)
@@ -29,10 +32,8 @@
}
// Compounds a bunch of (String, Int) elements so that [(String1, Int1), (String1, Int2)] becomes [(String1, Int1+Int2)]
- def compound(llsi: List[(String,Int)]): List[(String,Int)] =
- llsi.foldLeft[Map[String, Int]](Map.empty) {
- case (map, (str, cnt)) => map + (str -> (map.getOrElse(str, 0) + cnt))
- }.toList
+ // foldMap with List as Foldable and append operation of Map Monoid
+ def compound(llsi: List[(String,Int)]): List[(String,Int)] = llsi.foldMap(Map(_)).toList
def everyEven(x:List[(String, Int)]):List[(String, Int)] = everyOther(x)
