Add XML Depth to Your Inbound Trading Networks Flat Files By Rupinder Singh

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Implementing the read() Method

Once the above supporting methods are completed, the read() method must be implemented.

public int read() throws IOException
  {
    if (pos >= buffer.length)
    {
      String line = reader.readLine();

      if (line == null)
      {
        if (eof)
        {
          return -1;
        }
        eof = true;
        buffer = ("</" + docType + ">").getBytes();
        pos = 0;
      }
      else
      {
        buffer = formatRecord(line).getBytes();
        pos=0;
      }
    }
    return (int)buffer[pos++];
  }

  private String formatRecord(String line)
  {
    StringBuffer sbuffer = new StringBuffer();
    sbuffer.append(newLine + "<" + nodeName + ">");
    StringTokenizer st = new StringTokenizer(line, ",");
    for (int i=0; st.hasMoreTokens(); i++)
    {
      sbuffer.append(newLine + "<" + fieldnames[i] + ">");
      sbuffer.append(st.nextToken());
      sbuffer.append("</" + fieldnames[i] + ">");
    }
    sbuffer.append(newLine + "</" + nodeName + ">" + newLine);
    return sbuffer.toString();
  }

Register the content handler with the webMethods Integration Server using the ServerAPI.registerContentHandler() method and the work is completed.

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Summary

The advantage to using the content handlers in the article is that a partner does not need to modify its flat file format to submit documents to Trading Networks. In fact, because the content handler is transparent, the partner appears to be submitting a XML document.

In addition, the above content handler can be registered to handle multiple types of text content from multiple partners.

Two other important notes:

1. Because the actual conversion of the stream to an IData object is done by the webMethods XML content handler, it is guaranteed to be forward compatible.
   
   
2. If the server has been configured to handle large files, the document would show up as a large document in Trading Networks.

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