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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 static com.google.common.base.Preconditions.checkNotNull;
import java.util.Collections;
/**
* GWT emulation of {@link SingletonImmutableMap}.
*
* @author Hayward Chan
*/
final class SingletonImmutableMap<K, V> extends ImmutableMap<K, V> {
// These references are used both by the custom field serializer, and by the
// GWT compiler to infer the keys and values of the map that needs to be
// serialized.
//
// Although they are non-final, they are package private and the reference is
// never modified after a map is constructed.
K singleKey;
V singleValue;
SingletonImmutableMap(K key, V value) {
super(Collections.singletonMap(checkNotNull(key), checkNotNull(value)));
this.singleKey = key;
this.singleValue = value;
}
}
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