Multiset_CustomFieldSerializerBase.java revision 1d580d0f6ee4f21eb309ba7b509d2c6d671c4044 
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
23/**
24 * This class contains static utility methods for writing {@code Multiset} GWT
25 * field serializers. Serializers should delegate to
26 * {@link #serialize(SerializationStreamWriter, Multiset)} and to either
27 * {@link #instantiate(SerializationStreamReader, ImmutableMultiset.Builder)} or
28 * {@link #populate(SerializationStreamReader, Multiset)}.
29 *
30 * @author Chris Povirk
31 */
32final class Multiset_CustomFieldSerializerBase {
33  static ImmutableMultiset<Object> instantiate(
34      SerializationStreamReader reader,
35      ImmutableMultiset.Builder<Object> builder)
36      throws SerializationException {
37    int distinctElements = reader.readInt();
38    for (int i = 0; i < distinctElements; i++) {
39      Object element = reader.readObject();
40      int count = reader.readInt();
41      builder.addCopies(element, count);
42    }
43    return builder.build();
44  }
45
46  static Multiset<Object> populate(
47      SerializationStreamReader reader, Multiset<Object> multiset)
48      throws SerializationException {
49    int distinctElements = reader.readInt();
50    for (int i = 0; i < distinctElements; i++) {
51      Object element = reader.readObject();
52      int count = reader.readInt();
53      multiset.add(element, count);
54    }
55    return multiset;
56  }
57
58  static void serialize(SerializationStreamWriter writer, Multiset<?> instance)
59      throws SerializationException {
60    int entryCount = instance.entrySet().size();
61    writer.writeInt(entryCount);
62    for (Multiset.Entry<?> entry : instance.entrySet()) {
63      writer.writeObject(entry.getElement());
64      writer.writeInt(entry.getCount());
65    }
66  }
67
68  private Multiset_CustomFieldSerializerBase() {}
69}
70