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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.
// http://code.google.com/p/protobuf/
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package com.google.protobuf_spark;

import java.util.List;

/**
 * An interface extending List<String> that also provides access to the
 * items of the list as UTF8-encoded ByteString objects. This is used by the
 * protocol buffer implementation to support lazily converting bytes parsed
 * over the wire to String objects until needed and also increases the
 * efficiency of serialization if the String was never requested as the
 * ByteString is already cached.
 * 
 * This only adds additional methods that are required for the use in the
 * protocol buffer code in order to be able successfuly round trip byte arrays
 * through parsing and serialization without conversion to strings. It's not
 * attempting to support the functionality of say List<ByteString>, hence
 * why only these two very specific methods are added.
 *
 * @author [email protected] (Jon Perlow)
 */
public interface LazyStringList extends List {

  /**
   * Returns the element at the specified position in this list as a ByteString.
   *
   * @param index index of the element to return
   * @return the element at the specified position in this list
   * @throws IndexOutOfBoundsException if the index is out of range
   *         (index < 0 || index >= size())
   */
  ByteString getByteString(int index);

  /**
   * Appends the specified element to the end of this list (optional
   * operation).
   *
   * @param element element to be appended to this list
   * @throws UnsupportedOperationException if the add operation
   *         is not supported by this list
   */
  void add(ByteString element);
}