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I'm trying to generate java code that depends on other variables. In this specific moment, I'm trying to generate the code depending on the protocol. So I can receive a CoapResponse object or a Response object form ( javax).

I don't know if it is possible instead of repeating all the code two times with the parameter different if I can reuse the same code and change only the variable in some way.

The code that I want to change is the following: 


  MethodSpec payloadInterpreter = MethodSpec.methodBuilder("payloadInterpreter")
          .addModifiers(Modifier.PRIVATE)
          .addModifiers(Modifier.STATIC)
         .addParameter(Response.class, "getResponse")
          ....

And the Parameter it could be CoapResponse.class instead of Response.class.

I had the same problem with the Statements but I solved creating literals that use the information that the service received in runtime. An example:

if (MD.getMediatype().equals("JSON")){
      ReadOutDeclaration="JSONObject readout= null";
      GetReadOut="readout = getResponse.readEntity(JSONObject.class)";

and then:

 MethodSpec payloadInterpreter = MethodSpec.methodBuilder("payloadInterpreter")
     .addModifiers(Modifier.PRIVATE)
     .addModifiers(Modifier.STATIC)
     .addParameter(Response.class, "getResponse")
     .addStatement("$L",ReadOutDeclaration)
     .beginControlFlow("try")
     .addStatement("$L", GetReadOut)
     .addStatement("System.out.println(\"Provider Response payload: \" + $L)",ReadOutPrint)

I don't know if I can do something similar to this with the parameters or even if there are other ways to do change the generation dynamically. Thank you in advance.

Cristina Paniagua
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1 Answers1

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May be this helps:

MethodSpec.Builder payloadInterpreterMethod = MethodSpec.methodBuilder("payloadInterpreter")
          .addModifiers(Modifier.PRIVATE)
          .addModifiers(Modifier.STATIC);
if (condition) {
  payloadInterpreterMethod.addParameter(Response.class, "getResponse");
} else {
  payloadInterpreterMethod.addParameter(CoapResponse.class, "getResponse");
}

and once you want to add it to the TypeSpec, use:

payloadInterpreterMethod.build()
El Hoss
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  • Thank you! I didn't know that I could break the builder. This solves my question and it's going to save me a lot of time and code lines! – Cristina Paniagua Aug 16 '19 at 12:33