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A Scala wrapper of the MongoDB Reactive Streams Java driver

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/*
 * Copyright 2015 MongoDB, Inc.
 *
 * 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 org.mongodb.scala.internal

import scala.util.{ Failure, Success, Try }

import org.mongodb.scala._

private[scala] case class RecoverObservable[T, U >: T](
    observable: Observable[T],
    pf:         PartialFunction[Throwable, U]
) extends Observable[U] {

  override def subscribe(observer: Observer[_ >: U]): Unit = {
    observable.subscribe(
      new Observer[U] {
        override def onError(throwable: Throwable): Unit = {
          Try(pf(throwable)) match {
            case Success(res) => {
              observer.onNext(res)
              observer.onComplete()
            }
            case Failure(ex) => observer.onError(throwable)
          }
        }

        override def onSubscribe(subscription: Subscription): Unit = observer.onSubscribe(subscription)

        override def onComplete(): Unit = observer.onComplete()

        override def onNext(tResult: U): Unit = observer.onNext(tResult)
      }
    )
  }
}