abstract class BaseEpoxyHolder : EpoxyHolder() {
    lateinit var view: View
    val context: Context
        get() = view.context

    @CallSuper
    override fun bindView(itemView: View) {
        view = itemView
    }

    protected fun <V : View> bind(id: Int): ReadOnlyProperty<BaseEpoxyHolder, V> =
        Lazy { holder: BaseEpoxyHolder, prop ->
            holder.view.findViewById(id) as V?
                ?: throw IllegalStateException("View ID $id for '${prop.name}' not found.")
        }

    private class Lazy<V>(private val initializer: (BaseEpoxyHolder, KProperty<*>) -> V) :
        ReadOnlyProperty<BaseEpoxyHolder, V> {
        private object EMPTY

        private var value: Any? = EMPTY

        /**
         * Taken from Kotterknife.
         * https://github.com/JakeWharton/kotterknife
         */
        @Suppress("UNCHECKED_CAST")
        override fun getValue(thisRef: BaseEpoxyHolder, property: KProperty<*>): V {
            if (value == EMPTY) value = initializer(thisRef, property)
            return value as V
        }
    }
}