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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.
Optional features of classes derived from Map.

This class is GWT compatible.

George van den Driessche
// Enum values use constructors with generic varargs.
public enum MapFeature implements Feature<Map> {
The map does not throw NullPointerException on calls such as containsKey(null), get(null), or remove(null).
Indicates that the constructor or factory method of a map, usually an immutable map, throws an java.lang.IllegalArgumentException when presented with duplicate keys instead of discarding all but one.
  private final Set<Feature<? super Map>> implied;
  MapFeature(Feature<? super Map> ... implied) {
    this. = Helpers.copyToSet(implied);
  public Set<Feature<? super Map>> getImpliedFeatures() {
    return ;
  public @interface Require {
    public abstract MapFeature[] value() default {};
    public abstract MapFeature[] absent() default {};
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