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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,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
 import java.util.Map;
 import java.util.Set;
Methods factored out so that they can be emulated differently in GWT.

Hayward Chan
 @GwtCompatible(emulated = true)
 final class Platform {
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;
   static <E> Set<E> newSetFromMap(Map<E, Booleanmap) {
     return Collections.newSetFromMap(map);

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);
   static <K, V> SortedMap<K, V> mapsAsMapSortedSet(SortedSet<K> set,
       Function<? super K, V> function) {
     return (set instanceof NavigableSet)
         ? Maps.asMap((NavigableSet<K>) setfunction)
         : Maps.asMapSortedIgnoreNavigable(setfunction);
   static <E> SortedSet<E> setsFilterSortedSet(SortedSet<E> set,
       Predicate<? super E> predicate) {
     return (set instanceof NavigableSet)
         ? Sets.filter((NavigableSet<E>) setpredicate)
         : Sets.filterSortedIgnoreNavigable(setpredicate);
   static <K, V> SortedMap<K, V> mapsFilterSortedMap(SortedMap<K, V> map,
       Predicate<? super Map.Entry<K, V>> predicate) {
     return (map instanceof NavigableMap)
         ? Maps.filterEntries((NavigableMap<K, V>) mappredicate)
         : Maps.filterSortedIgnoreNavigable(mappredicate);
  private Platform() {}
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