com.google.common.collect.EmptyImmutableBiMap Maven / Gradle / Ivy
/*
* 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
*
* 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 com.google.common.annotations.GwtCompatible;
/**
* Bimap with no mappings.
*
* @author Jared Levy
*/
@GwtCompatible(emulated = true)
@SuppressWarnings("serial") // uses writeReplace(), not default serialization
final class EmptyImmutableBiMap extends ImmutableBiMap {
static final EmptyImmutableBiMap INSTANCE = new EmptyImmutableBiMap();
private EmptyImmutableBiMap() {}
@Override ImmutableMap delegate() {
return ImmutableMap.of();
}
@Override public ImmutableBiMap inverse() {
return this;
}
@Override boolean isPartialView() {
return false;
}
Object readResolve() {
return INSTANCE; // preserve singleton property
}
}