How to get class of primitive types with Javassist?

In my program, I deal with cl开发者_如何学编程asses and primitive types. If the program finds a class, it simply does one of the following calls :

• Class.forName(classname)
• cc.toClass() where cc is an instance of CtClass

However, if it finds a primitive type, things get worse :

• Class.forName is not usable, it cannot be used with primitive types.
• cc.toClass() returns null

It's possible to call the TYPE field from primitive types wrapper class but how can I do it with reflection ?

Here is my code :

CtClass cc;//Obtained from caller code
Class<?> classParam;
if (cc.isprimitive()) {
    classParam= ?? // How can I get TYPE field value with reflection ?
} else {
    String nomClasseParam = cc.getName();

    if (nomClasseParam.startsWith("java")) {
        classeParam = Class.forName(nomClasseParam);
    } else {
        classeParam = cc.toClass();
    }
 }

Javassist 3.12.0.GA

EDIT: I have posted the solution I chose in the anwsers below. Anyway, I ticked Tom's answer.

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It looks to me like you can cast cc to its subclass CtPrimitiveType.

If you wanted a wrapper, you could then use the method getWrapperName to get the class name of the appropriate wrapper. You can use Class.forName as usual to turn that name into a Class object. However, i don't think you do want a wrapper, so this doesn't help.

Instead, i think you want getDescriptor, followed by a laboriously handcoded switch statement:

switch(descriptor) {
    case 'I': classParam = int.class; break;
    // etc
}

Something like that really should be in Javassist. But as far as i can see, it isn't.

---

Based on responses from Tom and momo, here is the solution I came up with :

CtClass cc; //Obtained from caller code
Class<?> classParam;

if (cc.isprimitive()) {
    classParam = Class.forName(((CtPrimitiveType)cc).getWrapperName());
    classParam = (Class<?>)classParam.getDeclaredField("TYPE").get( classParam );
} else {
    String nomClasseParam = cc.getName();

    if (nomClasseParam.startsWith("java")) {
        classeParam = Class.forName(nomClasseParam);
    } else {
        classeParam = cc.toClass();
    }
 }

I call CtPrimitiveType#getWrapperName method and then I use the TYPE field to get the primitive type class. I also avoid writing a switch statement.

Thanks for your help guys.

---

You can do the Class.forName for the Object wrapper of primitive (e.g. Integer for primitive int). Java supports autoboxing, so you could interchange between the Object wrapper and the primitive counterpart.

I am assuming that you are using CtClass from JavaAssist. If cc is a primitive, I think it will be a type of CtPrimitiveType (need to confirm) in which case you could cast and call getWrapperName() to get the wrapper class.