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CollectionsNCopiesSerializer xref
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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *     http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing, software
13   * distributed under the License is distributed on an "AS IS" BASIS,
14   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15   * See the License for the specific language governing permissions and
16   * limitations under the License.
17   */
18  package org.apache.giraph.writable.kryo.serializers;
19  
20  import java.util.Collections;
21  import java.util.List;
22  
23  import com.esotericsoftware.kryo.Kryo;
24  import com.esotericsoftware.kryo.Serializer;
25  import com.esotericsoftware.kryo.io.Input;
26  import com.esotericsoftware.kryo.io.Output;
27  
28  /**
29   * Special serializer for Collections.nCopies
30   *
31   * @param <T> Element type
32   */
33  public class CollectionsNCopiesSerializer<T> extends Serializer<List<T>> {
34    @Override
35    public void write(Kryo kryo, Output output, List<T> object) {
36      output.writeInt(object.size(), true);
37      if (object.size() > 0) {
38        kryo.writeClassAndObject(output, object.get(0));
39      }
40    }
41  
42    @Override
43    public List<T> read(Kryo kryo, Input input, Class<List<T>> type) {
44      int size = input.readInt(true);
45      if (size > 0) {
46        T object = (T) kryo.readClassAndObject(input);
47        return Collections.nCopies(size, object);
48      } else {
49        return Collections.emptyList();
50      }
51    }
52  }