java.lang.invoke.SerializedLambda#getImplClass ( )源码实例Demo

/** 将 Property 转为 PropertyWrap  */
private static <C> PropertyWrap wrap(Property<C, ?> p) {
    try {
        Method fun = p.getClass().getDeclaredMethod("writeReplace");
        fun.setAccessible(Boolean.TRUE);
        SerializedLambda slambda = (SerializedLambda) fun.invoke(p);
        String method = slambda.getImplMethodName();
        String attr = null;
        if (method.startsWith("get")) {
            attr = method.substring(3);
        } else {
            attr = method.substring(2);//is
        }
        return new PropertyWrap(p, slambda.getImplClass(), attr);
    } catch (ReflectiveOperationException e) {
        throw new RuntimeException(e);
    }
}
 

@SuppressWarnings("squid:S00112")
public static <T, R extends Comparable> PropertyInfo getPropertyInfo(GetPropertyFunction<T, R> fn) {
    try {
        Method method = fn.getClass().getDeclaredMethod("writeReplace");
        method.setAccessible(true);
        SerializedLambda serializedLambda = (SerializedLambda) method.invoke(fn);
        String methodName = serializedLambda.getImplMethodName();
        String className = serializedLambda.getImplClass();
        String propertyName;
        String getString = "get";
        String isString = "is";
        if (methodName.startsWith(getString)) {
            propertyName = java.beans.Introspector.decapitalize(methodName.substring(3));
        } else if (methodName.startsWith(isString)) {
            propertyName = java.beans.Introspector.decapitalize(methodName.substring(2));
        } else {
            propertyName = methodName;
        }

        Class ownerClass;
        if (classMap.containsKey(className)) {
            ownerClass = classMap.get(className);
        } else {
            ownerClass = Class.forName(className.replace('/', '.'));
            classMap.put(className, ownerClass);
        }

        PropertyInfo propertyInfo = new PropertyInfo();
        propertyInfo.setPropertyName(propertyName);
        propertyInfo.setOwnerClass(ownerClass);
        return propertyInfo;
    } catch (ReflectiveOperationException e) {
        throw new InternalRuntimeException(e);
    }
}