How to get parameter values of current PsiElement?

Hi there,

I'm stuck in how to get actual parameter inputs in my plugin. I know PsiMethod for now.

For example,

/**
 * Signature of update:
 *     update(String ckey, String statement, Object parameter)
 */
getSqlSession().update("someKey", "updateLikeCount", params);

I want to know the input of ckey is "someKey", and of statement is "updateLikeCount".

My current codes are:

int offset = editor.getCaretModel().getOffset();
PsiElement element = GotoDeclarationAction.findTargetElement(project, editor, offset);

if (element instanceof PsiMethod) {
   PsiParameter[] parameters = ((PsiMethod) element).getParameterList().getParameters();
   for (PsiParameter param : parameters) {
      // want to get param value here...
   }
}

Look forward to any help!

Thanks :)