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DataInputOutput 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.utils.ExtendedDataInput;
22  import org.apache.giraph.utils.Factory;
23  import org.apache.hadoop.io.Writable;
24  
25  import java.io.DataOutput;
26  
27  /**
28   * Provides both DataOutput which we can write to and DataInputs which are
29   * going to read data which was written to DataOutput.
30   */
31  public abstract class DataInputOutput implements
32      Writable, Factory<ExtendedDataInput> {
33    /**
34     * Get DataOutput to write to
35     *
36     * @return DataOutput which we can write to
37     */
38    public abstract DataOutput getDataOutput();
39  
40    /**
41     * Create DataInput which reads data from underlying DataOutput
42     *
43     * @return DataInput
44     */
45    public abstract ExtendedDataInput createDataInput();
46  
47    @Override
48    public ExtendedDataInput create() {
49      return createDataInput();
50    }
51  }