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package java.util

abstract class AbstractQueue[E] protected ()
    extends AbstractCollection[E]
    with Queue[E] {

  override def add(e: E): Boolean =
    if (offer(e)) true
    else throw new IllegalStateException()

  def remove(): E =
    if (!isEmpty()) poll()
    else throw new NoSuchElementException()

  def element(): E =
    if (!isEmpty()) peek()
    else throw new NoSuchElementException()

  override def clear(): Unit = {
    while (poll() != null) {}
  }

  override def addAll(c: Collection[_ <: E]): Boolean = {
    val iter    = c.iterator
    var changed = false
    while (iter.hasNext()) changed = add(iter.next()) || changed
    changed
  }
}