private static Class generateMethodParameterClass()

in shenyu-client/shenyu-client-dubbo/shenyu-client-apache-dubbo/src/main/java/org/apache/shenyu/client/apache/dubbo/validation/ApacheDubboClientValidator.java [130:183]
52 lines of code
11 McCabe index (conditional complexity)

    private static Class<?> generateMethodParameterClass(final Class<?> clazz, final Method method, final String parameterClassName)
            throws Exception {
        ClassPool pool = ClassGenerator.getClassPool(clazz.getClassLoader());
        synchronized (parameterClassName.intern()) {
            CtClass ctClass = null;
            try {
                ctClass = pool.getCtClass(parameterClassName);
            } catch (NotFoundException neglect) {
                LOG.error(neglect.getMessage(), neglect);
            }

            if (Objects.isNull(ctClass)) {
                ctClass = pool.makeClass(parameterClassName);
                ClassFile classFile = ctClass.getClassFile();
                classFile.setVersionToJava5();
                ctClass.addConstructor(CtNewConstructor.defaultConstructor(pool.getCtClass(parameterClassName)));
                // parameter fields
                Class<?>[] parameterTypes = method.getParameterTypes();
                Annotation[][] parameterAnnotations = method.getParameterAnnotations();
                for (int i = 0; i < parameterTypes.length; i++) {
                    Class<?> type = parameterTypes[i];
                    Annotation[] annotations = parameterAnnotations[i];
                    AnnotationsAttribute attribute = new AnnotationsAttribute(classFile.getConstPool(), AnnotationsAttribute.visibleTag);
                    for (Annotation annotation : annotations) {
                        if (annotation.annotationType().isAnnotationPresent(Constraint.class)) {
                            javassist.bytecode.annotation.Annotation ja = new javassist.bytecode.annotation.Annotation(
                                    classFile.getConstPool(), pool.getCtClass(annotation.annotationType().getName()));
                            Method[] members = annotation.annotationType().getMethods();
                            for (Method member : members) {
                                if (Modifier.isPublic(member.getModifiers())
                                        && member.getParameterTypes().length == 0
                                        && member.getDeclaringClass() == annotation.annotationType()) {
                                    Object value = member.invoke(annotation);
                                    if (Objects.nonNull(value)) {
                                        MemberValue memberValue = createMemberValue(
                                                classFile.getConstPool(), pool.get(member.getReturnType().getName()), value);
                                        ja.addMemberValue(member.getName(), memberValue);
                                    }
                                }
                            }
                            attribute.addAnnotation(ja);
                        }
                    }
                    String fieldName = method.getName() + "Argument" + i;
                    CtField ctField = CtField.make("public " + type.getCanonicalName() + " " + fieldName + ";", pool.getCtClass(parameterClassName));
                    ctField.getFieldInfo().addAttribute(attribute);
                    ctClass.addField(ctField);
                }
                return ctClass.toClass(clazz.getClassLoader(), null);
            } else {
                return Class.forName(parameterClassName, true, clazz.getClassLoader());
            }
        }
    }