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.hbase.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 }