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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.hadoop.hbase.io;
19  
20  import java.io.DataOutput;
21  import java.io.IOException;
22  import java.io.OutputStream;
23  
24  import org.apache.hadoop.classification.InterfaceAudience;
25  
26  /**
27   * OutputStream implementation that wraps a DataOutput.
28   */
29  @InterfaceAudience.Private
30  public class DataOutputOutputStream extends OutputStream {
31  
32    private final DataOutput out;
33  
34    /**
35     * Construct an OutputStream from the given DataOutput. If 'out'
36     * is already an OutputStream, simply returns it. Otherwise, wraps
37     * it in an OutputStream.
38     * @param out the DataOutput to wrap
39     * @return an OutputStream instance that outputs to 'out'
40     */
41    public static OutputStream constructOutputStream(DataOutput out) {
42      if (out instanceof OutputStream) {
43        return (OutputStream)out;
44      } else {
45        return new DataOutputOutputStream(out);
46      }
47    }
48  
49    private DataOutputOutputStream(DataOutput out) {
50      this.out = out;
51    }
52  
53    @Override
54    public void write(int b) throws IOException {
55      out.writeByte(b);
56    }
57  
58    @Override
59    public void write(byte[] b, int off, int len) throws IOException {
60      out.write(b, off, len);
61    }
62  
63    @Override
64    public void write(byte[] b) throws IOException {
65      out.write(b);
66    }
67  }