How to add type constraints to parameterSpec for method

Question

I'm trying to do exactly what the title says -- I'd like to generate a method spec that looks something like:

public void doSomethingWithThis( Container<? extends ImportantInterface> argument ) {
 //1. Collect UnderPants
 //2. ...
 //3. Profit
}

I understand I can just use the raw type, but generated thing will be consumed by others down stream, and having the type info pop up in their IDEs ( and mine for that matter :/ ) would make my bug solving life easier down the line...

Answer to this is actually partially over here. https://stackoverflow.com/questions/40509818/how-to-generate-symbol-class-with-javapoet — lscoughlin, Mar 05 '18 at 09:52

score 0 · Accepted Answer · answered Mar 05 '18 at 09:54

So, I'm a toolbox and 7 more minutes digging around found the path to the answer. The question in the comment points in the right direction, though it's using ParameterizedTypeName.create() which is now ParameterizedTypeName.get()

Code for sample purposes because someone else might find this useful.

ClassName containerClassName = ClassName.get(Container.class);
TypeName wildcardTypeName = WildcardTypeName.subtypeOf(ImportantInterface.class);
ParameterizedTypeName parameterTypeName = ParameterizedTypeName.get(containerClassName, wildcardTypeName);

classBuilder.addMethod(MethodSpec.constructorBuilder()
        .addModifiers(Modifier.PUBLIC)
        .addParameter(parameterTypeName, "cargo")
        .addStatement(CodeBlock.builder()
                .addStatement("//1. Collect Underpants")
                .addStatement("//2. ...")
                .addStatement("//3. Profit!!!")
                .build())

How to add type constraints to parameterSpec for method

1 Answers1