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Kotlin core Protocol Buffers library. Protocol Buffers are a way of encoding structured data in an efficient yet extensible format.

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// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc.  All rights reserved.
// https://developers.google.com/protocol-buffers/
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//     * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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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())
    }
  }
}