/*
   * Finds a full file and sets it as the value.
   */
  public synchronized boolean next(LongWritable key, Text value) throws IOException {
    Text line = new Text();
    boolean retrieved = true;

    String result = "";

    value.clear();

    while (retrieved) {
      retrieved = recordReader.next(key, line);

      if (line.toString().length() > 0) {
        String lineValue = line.toString();
        result += lineValue + "\n";
      }
    }

    value.set(result);
    return true;
  }
  /* Finds a full sentence and sets it as the value.
   * If the sentence is shorter than the full line, the rest is stored to use later.
   */
  public synchronized boolean next(LongWritable key, Text value) throws IOException {
    Text line = new Text();
    boolean getMore = true;
    boolean retrieved = false;

    String result = leftovers;
    leftovers = "";

    value.clear();

    while (getMore) {
      retrieved = recordReader.next(key, line);

      if (retrieved) {
        String lineValue = line.toString();

        // here, we assume sentences run until the period.
        int endOfSentence = lineValue.indexOf('.');

        if (endOfSentence == -1) {
          result += " " + lineValue;
        } else {
          result += " " + lineValue.substring(0, endOfSentence + 1);
          leftovers = lineValue.substring(endOfSentence + 1);
          getMore = false;
        }
      } else {
        getMore = false;
        value.set(result);
        return false;
      }
    }

    value.set(result);
    return true;
  }