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/**
 * Copyright 2011-2016 GatlingCorp (http://gatling.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 io.gatling.commons.util

object RoundRobin {

  def apply[T](values: IndexedSeq[T]): Iterator[T] = values.length match {
    case 0 => Iterator.empty
    case 1 =>
      new Iterator[T] {
        val hasNext = true
        val next = values(0)
      }
    case _ =>
      new Iterator[T] {
        val counter = new CyclicCounter(values.length)
        val hasNext = true
        def next() = values(counter.nextVal)
      }
  }
}