1/*
2 * Copyright (C) 2009 The Guava Authors
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.google.common.collect;
18
19import com.google.gwt.user.client.rpc.SerializationException;
20import com.google.gwt.user.client.rpc.SerializationStreamReader;
21import com.google.gwt.user.client.rpc.SerializationStreamWriter;
22
23import java.util.Comparator;
24
25/**
26 * This class implements the GWT serialization of
27 * {@link EmptyImmutableSortedSet}.
28 *
29 * @author Chris Povirk
30 */
31public class EmptyImmutableSortedSet_CustomFieldSerializer {
32  public static void deserialize(SerializationStreamReader reader,
33      EmptyImmutableSortedSet<?> instance) {
34  }
35
36  public static EmptyImmutableSortedSet<Object> instantiate(
37      SerializationStreamReader reader) throws SerializationException {
38    /*
39     * Nothing we can do, but we're already assuming the serialized form is
40     * correctly typed, anyway.
41     */
42    @SuppressWarnings("unchecked")
43    Comparator<Object> comparator = (Comparator<Object>) reader.readObject();
44
45    /*
46     * For this custom field serializer to be invoked, the set must have been
47     * EmptyImmutableSortedSet before it's serialized. Since
48     * EmptyImmutableSortedSet always has no elements, ImmutableSortedSet.copyOf
49     * always return an EmptyImmutableSortedSet back.
50     */
51    return (EmptyImmutableSortedSet<Object>)
52        ImmutableSortedSet.orderedBy(comparator).build();
53  }
54
55  public static void serialize(SerializationStreamWriter writer,
56      EmptyImmutableSortedSet<?> instance) throws SerializationException {
57    writer.writeObject(instance.comparator());
58  }
59}
60