third_party/protobuf/3.6.1/java/core/src/main/java/com/google/protobuf/ProtobufArrayList.java

// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc.  All rights reserved.
// https://developers.google.com/protocol-buffers/
//
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// 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
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package com.google.protobuf;

import com.google.protobuf.Internal.ProtobufList;

import java.util.ArrayList;
import java.util.List;

/**
 * Implements {@link ProtobufList} for non-primitive and {@link String} types.
 */
final class ProtobufArrayList<E> extends AbstractProtobufList<E> {

  private static final ProtobufArrayList<Object> EMPTY_LIST = new ProtobufArrayList<Object>();
  static {
    EMPTY_LIST.makeImmutable();
  }
  
  @SuppressWarnings("unchecked") // Guaranteed safe by runtime.
  public static <E> ProtobufArrayList<E> emptyList() {
    return (ProtobufArrayList<E>) EMPTY_LIST;
  }
  
  private final List<E> list;

  ProtobufArrayList() {
    this(new ArrayList<E>(DEFAULT_CAPACITY));
  }
  
  private ProtobufArrayList(List<E> list) {
    this.list = list;
  }

  @Override
  public ProtobufArrayList<E> mutableCopyWithCapacity(int capacity) {
    if (capacity < size()) {
      throw new IllegalArgumentException();
    }
    List<E> newList = new ArrayList<E>(capacity);
    newList.addAll(list);
    return new ProtobufArrayList<E>(newList);
  }
  
  @Override
  public void add(int index, E element) {
    ensureIsMutable();
    list.add(index, element);
    modCount++;
  }

  @Override
  public E get(int index) {
    return list.get(index);
  }
  
  @Override
  public E remove(int index) {
    ensureIsMutable();
    E toReturn = list.remove(index);
    modCount++;
    return toReturn;
  }
  
  @Override
  public E set(int index, E element) {
    ensureIsMutable();
    E toReturn = list.set(index, element);
    modCount++;
    return toReturn;
  }

  @Override
  public int size() {
    return list.size();
  }
}