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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.core.action

import io.gatling.core.stats.StatsEngine
import io.gatling.core.session.{ Expression, Session }
import io.gatling.core.util.NameGen

/**
 * A conditional Action
 *
 * @constructor create an IfAction
 * @param condition the condition that decides whether to execute thenNext or elseNext
 * @param thenNext the action executed if condition evaluates to true
 * @param elseNext the action executed if condition evaluates to false
 * @param statsEngine the StatsEngine
 * @param next the action executed if condition evaluates to false and elseNext equals None
 */
class If(condition: Expression[Boolean], thenNext: Action, elseNext: Action, val statsEngine: StatsEngine, val next: Action) extends ExitableAction with NameGen {

  override val name: String = genName("if")

  /**
   * Evaluates the condition and decides what to do next
   *
   * @param session the session of the virtual user
   */
  override def execute(session: Session): Unit = recover(session) {
    condition(session).map { condition =>
      val n = if (condition) thenNext else elseNext
      n ! session
    }
  }
}