com.noheltcj.rxcommon.observables.Single.kt Maven / Gradle / Ivy

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package com.noheltcj.rxcommon.observables

import com.noheltcj.rxcommon.Source
import com.noheltcj.rxcommon.disposables.Disposable
import com.noheltcj.rxcommon.disposables.Disposables
import com.noheltcj.rxcommon.emitters.SingleEmitter
import com.noheltcj.rxcommon.observers.Observer

open class Single() : Source {
  private var disposable: Disposable? = null

  private val emitter = SingleEmitter {
    disposable?.dispose()
  }

  constructor(createWithEmitter : (SingleEmitter) -> Disposable) : this() {
    disposable = createWithEmitter(emitter)
    if (emitter.isDisposed) {
      disposable?.dispose()
    }
  }

  constructor(just: E) : this() {
    emitter.next(just)
  }

  constructor(error: Throwable) : this() {
    emitter.terminate(error)
  }

  override fun subscribe(observer: Observer) : Disposable {
    emitter.addObserver(observer)

    return Disposables.create {
      emitter.removeObserver(observer)
    }
  }
}