Examples of org.apache.hadoop.util.LineReader.readLine()

org.apache.hadoop.util.LineReader.readLine()
Read one line from the InputStream into the given Text. @param str the object to store the given line (without newline) @param maxLineLength the maximum number of bytes to store into str;the rest of the line is silently discarded. @param maxBytesToConsume the maximum number of bytes to consumein this call. This is only a hint, because if the line cross this threshold, we allow it to happen. It can overshoot potentially by as much as one buffer length. @return the number of bytes read including the (longest) newlinefound. @throws IOException if the underlying stream throws

  public static void main(String[] args) throws Exception {
    for(String arg: args) {
      System.out.println("Working on " + arg);
      LineReader reader = makeStream(unquote(arg));
      Text line = new Text();
      int size = reader.readLine(line);
      while (size > 0) {
        System.out.println("Got: " + line.toString());
        size = reader.readLine(line);
      }
      reader.close();

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      LineReader reader = makeStream(unquote(arg));
      Text line = new Text();
      int size = reader.readLine(line);
      while (size > 0) {
        System.out.println("Got: " + line.toString());
        size = reader.readLine(line);
      }
      reader.close();
    }
  }
}

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  @Test
  public void testUTF8() throws Exception {
    LineReader in = makeStream("abcd\u20acbdcd\u20ac");
    Text line = new Text();
    in.readLine(line);
    assertEquals("readLine changed utf8 characters", 
                 "abcd\u20acbdcd\u20ac", line.toString());
    in = makeStream("abc\u200axyz");
    in.readLine(line);
    assertEquals("split on fake newline", "abc\u200axyz", line.toString());

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    Text line = new Text();
    in.readLine(line);
    assertEquals("readLine changed utf8 characters", 
                 "abcd\u20acbdcd\u20ac", line.toString());
    in = makeStream("abc\u200axyz");
    in.readLine(line);
    assertEquals("split on fake newline", "abc\u200axyz", line.toString());
  }


  @Test
  public void testNewLines() throws Exception {

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  @Test
  public void testNewLines() throws Exception {
    LineReader in = makeStream("a\nbb\n\nccc\rdddd\r\neeeee");
    Text out = new Text();
    in.readLine(out);
    assertEquals("line1 length", 1, out.getLength());
    in.readLine(out);
    assertEquals("line2 length", 2, out.getLength());
    in.readLine(out);
    assertEquals("line3 length", 0, out.getLength());

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  public void testNewLines() throws Exception {
    LineReader in = makeStream("a\nbb\n\nccc\rdddd\r\neeeee");
    Text out = new Text();
    in.readLine(out);
    assertEquals("line1 length", 1, out.getLength());
    in.readLine(out);
    assertEquals("line2 length", 2, out.getLength());
    in.readLine(out);
    assertEquals("line3 length", 0, out.getLength());
    in.readLine(out);
    assertEquals("line4 length", 3, out.getLength());

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    Text out = new Text();
    in.readLine(out);
    assertEquals("line1 length", 1, out.getLength());
    in.readLine(out);
    assertEquals("line2 length", 2, out.getLength());
    in.readLine(out);
    assertEquals("line3 length", 0, out.getLength());
    in.readLine(out);
    assertEquals("line4 length", 3, out.getLength());
    in.readLine(out);
    assertEquals("line5 length", 4, out.getLength());

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    assertEquals("line1 length", 1, out.getLength());
    in.readLine(out);
    assertEquals("line2 length", 2, out.getLength());
    in.readLine(out);
    assertEquals("line3 length", 0, out.getLength());
    in.readLine(out);
    assertEquals("line4 length", 3, out.getLength());
    in.readLine(out);
    assertEquals("line5 length", 4, out.getLength());
    in.readLine(out);
    assertEquals("line5 length", 5, out.getLength());

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    assertEquals("line2 length", 2, out.getLength());
    in.readLine(out);
    assertEquals("line3 length", 0, out.getLength());
    in.readLine(out);
    assertEquals("line4 length", 3, out.getLength());
    in.readLine(out);
    assertEquals("line5 length", 4, out.getLength());
    in.readLine(out);
    assertEquals("line5 length", 5, out.getLength());
    assertEquals("end of file", 0, in.readLine(out));
  }

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    assertEquals("line3 length", 0, out.getLength());
    in.readLine(out);
    assertEquals("line4 length", 3, out.getLength());
    in.readLine(out);
    assertEquals("line5 length", 4, out.getLength());
    in.readLine(out);
    assertEquals("line5 length", 5, out.getLength());
    assertEquals("end of file", 0, in.readLine(out));
  }
  
  private static void writeFile(FileSystem fs, Path name,

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