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ExtendedDataInputOutput 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  
19  package org.apache.giraph.utils.io;
20  
21  import org.apache.giraph.conf.ImmutableClassesGiraphConfiguration;
22  import org.apache.giraph.utils.ExtendedDataInput;
23  import org.apache.giraph.utils.ExtendedDataOutput;
24  import org.apache.giraph.utils.WritableUtils;
25  
26  import java.io.DataInput;
27  import java.io.DataOutput;
28  import java.io.IOException;
29  
30  /**
31   * Wraps {@link ExtendedDataOutput} and {@link ExtendedDataOutput} to be able
32   * to write data and later read data from the same place
33   */
34  public class ExtendedDataInputOutput extends DataInputOutput {
35    /** Configuration */
36    private final ImmutableClassesGiraphConfiguration conf;
37    /** DataOutput which we write to */
38    private ExtendedDataOutput dataOutput;
39  
40    /**
41     * Constructor
42     *
43     * @param conf Configuration
44     */
45    public ExtendedDataInputOutput(ImmutableClassesGiraphConfiguration conf) {
46      this.conf = conf;
47      dataOutput = conf.createExtendedDataOutput();
48    }
49  
50    @Override
51    public DataOutput getDataOutput() {
52      return dataOutput;
53    }
54  
55    @Override
56    public ExtendedDataInput createDataInput() {
57      return conf.createExtendedDataInput(dataOutput.getByteArray(), 0,
58          dataOutput.getPos());
59    }
60  
61    @Override
62    public void write(DataOutput out) throws IOException {
63      WritableUtils.writeExtendedDataOutput(dataOutput, out);
64    }
65  
66    @Override
67    public void readFields(DataInput in) throws IOException {
68      dataOutput = WritableUtils.readExtendedDataOutput(in, conf);
69    }
70  }