Examples of org.apache.hadoop.hdfs.util.ExactSizeInputStream

org.apache.hadoop.hdfs.util.ExactSizeInputStream
An InputStream implementations which reads from some other InputStream but expects an exact number of bytes. Any attempts to read past the specified number of bytes will return as if the end of the stream was reached. If the end of the underlying stream is reached prior to the specified number of bytes, an EOFException is thrown.

  }
  
  @Test
  public void testReadNotEnough() throws IOException {
    // Ask for 5 bytes, only has 2
    ExactSizeInputStream s = new ExactSizeInputStream(byteStream("he"), 5);
    assertEquals(2, s.available());
    
    assertEquals((int)'h', s.read());
    assertEquals((int)'e', s.read());
    try {
      s.read();
      fail("Read when should be out of data");
    } catch (EOFException e) {
      // expected
    }
  }

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  }
  
  @Test
  public void testSkipNotEnough() throws IOException {
    // Ask for 5 bytes, only has 2
    ExactSizeInputStream s = new ExactSizeInputStream(byteStream("he"), 5);
    assertEquals(2, s.skip(3));
    try {
      s.skip(1);
      fail("Skip when should be out of data");
    } catch (EOFException e) {
      // expected
    }
  }

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  }
  
  @Test
  public void testReadArrayNotEnough() throws IOException {
    // Ask for 5 bytes, only has 2
    ExactSizeInputStream s = new ExactSizeInputStream(byteStream("he"), 5);
    byte[] buf = new byte[10];
    assertEquals(2, s.read(buf, 0, 5));
    try {
      s.read(buf, 2, 3);
      fail("Read buf when should be out of data");
    } catch (EOFException e) {
      // expected
    }
  }

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    }
  }


  @Test
  public void testMark() throws IOException {
    ExactSizeInputStream s = new ExactSizeInputStream(byteStream("he"), 5);
    assertFalse(s.markSupported());
    try {
      s.mark(1);
      fail("Mark should not succeed");
    } catch (UnsupportedOperationException uoe) {
      // expected
    }
  }

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      throw new EOFException("Premature EOF: no length prefix available");
    }


    int size = CodedInputStream.readRawVarint32(firstByte, input);
    assert size >= 0;
    return new ExactSizeInputStream(input, size);
  }

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      throw new EOFException("Premature EOF: no length prefix available");
    }


    int size = CodedInputStream.readRawVarint32(firstByte, input);
    assert size >= 0;
    return new ExactSizeInputStream(input, size);
  }

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      throw new EOFException("Premature EOF: no length prefix available");
    }


    int size = CodedInputStream.readRawVarint32(firstByte, input);
    assert size >= 0;
    return new ExactSizeInputStream(input, size);
  }

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    }
    
    int size = CodedInputStream.readRawVarint32(firstByte, input);
    assert size >= 0;
  
    return new ExactSizeInputStream(input, size);
  }

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    }
    
    int size = CodedInputStream.readRawVarint32(firstByte, input);
    assert size >= 0;
  
    return new ExactSizeInputStream(input, size);
  }

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    }
    
    int size = CodedInputStream.readRawVarint32(firstByte, input);
    assert size >= 0;
  
    return new ExactSizeInputStream(input, size);
  }

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