private <P> P createProxy(Class<P> paramInterface, String... args) {
Map<String, MethodParamPair> params = new HashMap<String, MethodParamPair>();
paramMap.clear();
convertedParamMap.clear();
wantHelp = false;
for (Method method : paramInterface.getDeclaredMethods()) {
Option option = ReflectionUtils.getOptionAnnotation(method);
String name = getParameterName(method, option);
if (name.length() > maxParamLength) {
maxParamLength = name.length();
}
String description = option.description();
String defaultValue = option.defaultValue();
if (defaultValue.equals(Option.OPTIONAL)) {
defaultValue = null;
}
Class<?> returnType = ReflectionUtils.getBoxedClass(method.getReturnType());
Param param = new Param(name, description, defaultValue, returnType);
paramMap.put(name, param);
MethodParamPair pair = new MethodParamPair(method, param);
params.put(name, pair);
}
Map<Method, Object> valuesMap = convert(params, args);
for (Map.Entry<Method, Object> entry : valuesMap.entrySet()) {
Method method = entry.getKey();
Option option = ReflectionUtils.getOptionAnnotation(method);
String name = getParameterName(method, option);
convertedParamMap.put(name, entry.getValue());
}
if (wantHelp) {
displayUsage();
System.exit(0);
}
ParamInvocationHandler invocationHandler = new ParamInvocationHandler(valuesMap);
return (P)
Proxy.newProxyInstance(
paramInterface.getClassLoader(), new Class<?>[] {paramInterface}, invocationHandler);
}
private <P> String getParameterName(Method method, Option option) {
return option.name().length() == 0 ? ReflectionUtils.getParamName(method) : option.name();
}