ocelot-desktop/src/main/scala/ocelot/desktop/util/Watcher.scala

package ocelot.desktop.util

/**
  * Keeps a reference to an object
  * and tells whether there were any changes to the value since the last check.
  */
class Watcher[T](value: T) {
  private var hash: Int = value.hashCode()

  def didChange: Boolean = {
    val newHash = value.hashCode()
    if (hash != newHash) {
      hash = newHash
      true
    } else {
      false
    }
  }
}

object Watcher {
  def apply[T](value: T) = new Watcher(value)
}