Generating methods with generic types with Asm bytecode generator (ClassWriter)

Question

Defining simple getters and setters is easy using Asm (and fortunately it is even explained in their FAQ). But one thing that is not mentioned, and for which I have been unable

Answer 1

You can build the signature using ASM's SignatureWriter class.

For example, suppose you wish to write the signature for this method:

public  void doSomething(K thing)

You could use this code:

SignatureWriter signature = new SignatureWriter();
signature.visitFormalTypeParameter("K");

// Ensure that  extends java.lang.Object
{
    SignatureVisitor classBound = signature.visitClassBound();
    classBound.visitClassType(Type.getInternalName(Object.class));
    classBound.visitEnd();
}

// The parameter uses the  type variable
signature.visitParameterType().visitTypeVariable("K");

// The return type uses the void primitive ('V')
signature.visitReturnType().visitBaseType('V');

signature.visitEnd();

String signatureString = signature.toString();

Which is equivalent to:

String signatureString = "(TK;)V;"