CodeGen Example 1

CodeGen Templates

A codeGen Template is a directory with

• Generate.properties control file
• An Xml file listing the Velocity templates and there output names
• One or more Velocity templates

Mdt Template

The MDT template is for Cobol copybooks where every logical field consists of
2 logical fields:

• A Mdt field that indicates if the Field is present
• The Data field

So in the AAA-MDT is the flag indicates if the AAA is present or not

         20  AAA-MDT     PIC X(01).
         20  AAA         PIC X(03).
         20  BBB-MDT     PIC X(01).
         20  BBB         PIC X(03).

The Mdt Template generates a "field* for each logical field.
The above will generate

    public IStringField getAAA() { ... }
    public IStringField getBBB() { ... }

Mdt Template principles

One of the principles is to keep the Velocity Templates as simple as possible and move as much
code as possible into support classes.
The Support code is in the SupportJavaSource directory

Support Code

Some important classes

Generating using the RecordEditor

• Select the Generate >>> Java JRecord code for Cobol
  
• Select the Cobol copybook and click the Generte JRecord Button
  
• Enter the directory holding the template directories. So if directory structure is
  /MyTemplates/MdtTemplate you would enter MyTemplates in this field and the MdtTemplate + any other Template directories
  in the MyTemplates will be listed in the Template Combo box below it.
  

Generating CodeGen

if you download the standalone version of CodeGen
you can generate the skel using bat/shell script:

java -jar ../lib/JRecordCodeGen.jar  ^
              -TemplateDirectory  CodeGenExample ^
              -Template           MdtTemplate ^
              -Schema             LKSA310I_Opp101_RequestFormat.cbl  ^
              -Package            MdtTest.code  ^
              -outputDirectory    MdtOut