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ArraysAsListSerializer 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.Arrays;
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 Arrays.asList() as they can not be
30   * deserialized in a standard way.
31   *
32   * https://groups.google.com/forum/#!msg/kryo-users/2lXTCEOSxA0/gLzIZRtaNCUJ
33   */
34  public class ArraysAsListSerializer extends Serializer<List> {
35    @Override
36    public void write(Kryo kryo, Output output, List object) {
37      kryo.writeObject(output, object.toArray(new Object[object.size()]));
38    }
39  
40    @Override
41    public List read(Kryo kryo, Input input, Class<List> type) {
42      return Arrays.asList(kryo.readObject(input, Object[].class));
43    }
44  }