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  Tutorial: Extensible Code Generation with Java

Extensible Code Generation with Java Part 2 In part 1 of this series, we looked at the idea of generated code, which is code written not by hand but by another application. The appeal of generated code is that it can eliminate drudgery (and mistakes) i

Tutorial Details:

Using Safe Zones
A safe zone is a comment-delimited section of code where you can add any custom code you require. Here is an example from getTotalAmount in the example from part 1:

public double getTotalAmount( boolean calculateVAT ) {

// START-SAFE(Order-getTotalAmount)
System.out.println("Hello");
// END-SAFE
return 0.0;
}
You can make any changes you like to the interior of the highlighted section and they will be preserved between code generation cycles. Of course, you can have as many safe zones as you like, but you should use them judiciously to demonstrate where you would like to see the code extended, and not just anywhere.

Implementing safe zones is a little tricky because we have to scan the original output files and store the safe-zone contents. Then we need to feed the stored safe-zone contents back into the template so they can be reintegrated into the new output.


 

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