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  * Copyright (C) 2008 The Guava Authors
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
Methods factored out so that they can be emulated differently in GWT.

Hayward Chan
@GwtCompatible(emulated = true)
class Platform {
Clone the given array using java.lang.Object.clone(). It is factored out so that it can be emulated in GWT.
  static <T> T[] clone(T[] array) {
    return array.clone();

Returns a new array of the given length with the same type as a reference array.

reference any array of the desired type
length the length of the new array
  static <T> T[] newArray(T[] referenceint length) {
    Class<?> type = reference.getClass().getComponentType();
    // the cast is safe because
    // result.getClass() == reference.getClass().getComponentType()
    T[] result = (T[]) Array.newInstance(typelength);
    return result;

Configures the given map maker to use weak keys, if possible; does nothing otherwise (i.e., in GWT). This is sometimes acceptable, when only server-side code could generate enough volume that reclamation becomes important.
  static MapMaker tryWeakKeys(MapMaker mapMaker) {
    return mapMaker.weakKeys();
  static <K, V1, V2> SortedMap<K, V2> mapsTransformEntriesSortedMap(
      SortedMap<K, V1> fromMap,
      EntryTransformer<? super K, ? super V1, V2> transformer) {
    return (fromMap instanceof NavigableMap)
        ? Maps.transformEntries((NavigableMap<K, V1>) fromMaptransformer)
        : Maps.transformEntriesIgnoreNavigable(fromMaptransformer);
  private Platform() {}
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