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DataInputWrapperStream 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;
19  
20  import java.io.DataInput;
21  import java.io.EOFException;
22  import java.io.IOException;
23  import java.io.InputStream;
24  
25  /**
26   * Thin wrapper around DataInput so it can be used as an
27   * {@link java.io.InputStream}
28   *
29   * For use with {@link com.esotericsoftware.kryo.io.Input}
30   */
31  public class DataInputWrapperStream extends InputStream {
32    /** Wrapped DataInput object */
33    private DataInput in;
34  
35    public void setDataInput(DataInput in) {
36      this.in = in;
37    }
38  
39    @Override
40    public int read() throws IOException {
41      try {
42        return in.readByte() & 0xFF;
43      } catch (EOFException e) {
44        throw new RuntimeException(
45            "Chunked input should never read more than chunked output wrote", e);
46      }
47    }
48  
49    @Override
50    public int read(byte[] b, int off, int len) throws IOException {
51      try {
52        in.readFully(b, off, len);
53        return len;
54      } catch (EOFException e) {
55        throw new RuntimeException(
56            "Chunked input should never read more than chunked output wrote", e);
57      }
58    }
59  }