Anyone know how I can do the following using javapoet
public class MyClassGenerated extends MyMapper<OtherClass>{
}
My code of generation:
TypeSpec generateClass() {
return classBuilder("MyClassGenerated")
.addModifiers(PUBLIC)
.superclass(???????????????)
.build();
}
The ParameterizedTypeName
class allows you to specify generic type arguments when declaring the super class. For instance, if your MyClassGenerated
class is a subclass of the MyMapper
class, you can set a generic type parameter of MyMapper
like so:
TypeSpec classSpec = classBuilder("MyClassGenerated")
.addModifiers(PUBLIC)
.superclass(ParameterizedTypeName.get(ClassName.get(MyMapper.class),
ClassName.get(OtherClass.class)))
.build();
This will generate a TypeSpec
object that is equivalent to the following class:
public class MyClassGenerated extends MyMapper<OtherClass> { }
While not specified in the question, note that you can set any number of generic type arguments by simply adding them in the correct order to the ParameterizedTypeName.get
call:
ParameterizedTypeName.get(
ClassName.get(SuperClass.class),
ClassName.get(TypeArgumentA.class),
ClassName.get(TypeArgumentB.class),
ClassName.get(TypeArgumentC.class)
); // equivalent to SuperClass<TypeArgumentA, TypeArgumentB, TypeArgumentC>
For more information about the ParameterizedTypeName.get()
method, see the documentation here or the "$T for Types" section of the JavaPoet GitHub page.
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