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/*
* =========================================================================================
* Copyright © 2013 the kamon project <http://kamon.io/>
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the
* License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
* either express or implied. See the License for the specific language governing permissions
* and limitations under the License.
* =========================================================================================
*/
package kamon
import scala.annotation.tailrec
import com.typesafe.config.Config
package object metric {
@tailrec def combineMaps[K, V](left: Map[K, V], right: Map[K, V])(valueMerger: (V, V) ⇒ V): Map[K, V] = {
if (right.isEmpty)
left
else {
val (key, rightValue) = right.head
val value = left.get(key).map(valueMerger(_, rightValue)).getOrElse(rightValue)
combineMaps(left.updated(key, value), right.tail)(valueMerger)
}
}
}
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