/
ImmutableEnumSet.java
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/
ImmutableEnumSet.java
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/*
* Copyright (C) 2009 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
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* 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.
*/
package com.google.common.collect;
import java.util.Set;
/**
* GWT emulation of {@link ImmutableEnumSet}. The type parameter is not bounded by {@code Enum<E>}
* to avoid code-size bloat.
*
* @author Hayward Chan
*/
@ElementTypesAreNonnullByDefault
final class ImmutableEnumSet<E> extends ForwardingImmutableSet<E> {
static <E> ImmutableSet<E> asImmutable(Set<E> delegate) {
switch (delegate.size()) {
case 0:
return ImmutableSet.of();
case 1:
return ImmutableSet.of(Iterables.getOnlyElement(delegate));
default:
return new ImmutableEnumSet<E>(delegate);
}
}
public ImmutableEnumSet(Set<E> delegate) {
super(delegate);
}
}