Filename read during HL7 message processing

You can implement the functionality to extract the first six characters from the filename and insert them into MSH-6 in multiple HL7 messages within HealthConnect. A custom solution using InterSystems HealthConnect tools would be necessary for this specific task. Below are some resources to consider:

1. Custom File Adapter Approach: You can create a custom adapter extending EnsLib.File.OutboundAdapter, allowing dynamic file path and filename manipulation based on HL7 message content or input filename. For your case, you can pull the filename and extract its first six characters which can then be stored or manipulated:

   • Use object methods available for stream handling and ensure you integrate proper lookup or extraction logic for filenames from stream objects [1].

2. State Machine Handling: You can design a method to walk through file streams. Implement a state machine approach to process segments, extracting the desired filename's prefix (first six characters) and inserting them into MSH-6 of each HL7 message. This can be achieved while iterating through HL7 messages in the input file stream [2].

3. Dynamic Parsing within a Custom Service:

   • Modify or create a custom service derived from EnsLib.HL7.Service.FileService. This service can preprocess filenames from the incoming file before parsing HL7 messages. From the extracted prefix of the filename, you can dynamically update the content of MSH-6 using message manipulation APIs [2][3].

4. Use DTL to Transform Messages: You can use Data Transform Language (DTL) within HealthConnect:

   • In your DTL transformation logic, access the filename prefix and set it for MSH-6 dynamically. This requires implementing a preprocessing stage to extract the filename prefix into a variable and then map or assign it within the transformation logic when processing each HL7 MSH segment [4].

5. For handling multiple HL7 messages with multiple MSH segments:

   • Parse the file stream to count or iterate over multiple messages and ensure data insertion at precise positions (such as MSH-6). Looping constructs within custom classes or using EnsLib HL7 utilities and function sets help in processing multiple records [3].

Reference the provided examples for functional customization in classes and follow the guidelines to achieve desired results [2][3][4][1].

Sources:

If you're using the HL7 File Service, the full filename can be found as a %String in the message object's Source property. You can extract the required characters from that and set MSH:6 in a DTL: