com.google.protobuf.UnmodifiableCollections.kt Maven / Gradle / Ivy

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package com.google.protobuf.kotlin

/** Wraps an [Iterator] and makes it unmodifiable even from Java. */
internal class UnmodifiableIterator(delegate: Iterator) : Iterator by delegate

/** Wraps a [ListIterator] and makes it unmodifiable even from Java. */
internal class UnmodifiableListIterator(
  delegate: ListIterator
) : ListIterator by delegate

/** Wraps a [Collection] and makes it unmodifiable even from Java. */
internal open class UnmodifiableCollection(
  private val delegate: Collection
) : Collection by delegate {
  override fun iterator(): Iterator = UnmodifiableIterator(delegate.iterator())
}

/** Wraps a [Set] and makes it unmodifiable even from Java. */
internal class UnmodifiableSet(
  delegate: Collection
) : UnmodifiableCollection(delegate), Set

/** Wraps a [Map.Entry] and makes it unmodifiable even from Java. */
internal class UnmodifiableMapEntry(delegate: Map.Entry) : Map.Entry by delegate

/** Wraps a [Set] of map entries and makes it unmodifiable even from Java. */
internal class UnmodifiableMapEntries(
  private val delegate: Set>
) : UnmodifiableCollection>(delegate), Set> {

  // Is this overkill? Probably.

  override fun iterator(): Iterator> {
    val itr = delegate.iterator()
    return object : Iterator> by itr {
      override fun next(): Map.Entry = UnmodifiableMapEntry(itr.next())
    }
  }
}