[英]Checking the class of a Java Reflection Type
I've been going through the answers I've seen on SO and thus far I can't find any solutions that work correctly for me. 我一直在寻找在SO上看到的答案,到目前为止,我找不到适合我的任何解决方案。 Essentially I'm just using reflection to get a method, and then get all its parameter types like this: 本质上,我只是使用反射来获取方法,然后获取其所有参数类型,如下所示:
Type[] parameters = method.getGenericParameterTypes();
From there I am iterating through the parameters
to get their respective classes so I can pass the correct data. 从那里我遍历parameters
以获取它们各自的类,以便我可以传递正确的数据。 I've tried the following: 我尝试了以下方法:
Type currentType = parameters[index];
Class<?> clazz = Class.forName(currentType.getClass().getName());
if (clazz.isAssignableFrom(Number.class)) {
//do stuff that is number specific
//EG drill down farther into specific subclass like int,
//double, etc for more exact parsing
} else if (clazz.isAssignableFrom(String.class)) {
//Do stuff that is specific to string
} else {
//Nope, no love here.
}
But it doesn't correctly detect when it should be a Number
or String
and always falls into the last else statement. 但是它不能正确检测它什么时候应该是Number
或String
并且总是落在最后的else语句中。 There must be something really simple that I'm overlooking, but for the life of me I cannot determine what it could be. 我必须忽略一些非常简单的事情,但是对于我一生来说,我无法确定它可能是什么。
Thanks to all in advance. 在此先感谢所有。
Update: Here is a really simple example of a method stub I'm parsing. 更新:这是我正在解析的方法存根的一个非常简单的示例。 It isn't anything complicated. 没什么复杂的。
public void methodWithInt(int integer){
//do something
}
public void methodWithString(String string){
//do something else
}
Update: Based on Sotirios Delimanolis
answer I've made some progress. 更新:根据Sotirios Delimanolis
回答,我已经取得了一些进展。
if (currentType instanceof Class) {
Class<?> currentClazz = (Class<?>) currentType;
if (currentClazz.isAssignableFrom(Number.class)) {
// This isn't getting reached for either int or Integer
} else if (currentClazz.isAssignableFrom(String.class)) {
// This IS working correctly for strings
} else {
// Both int and Integer fall here
}
} else {
// Are primitives supposed to be handled here? If so int isn't
// being sent here, but is falling in the the else from the
// condition previous to this one.
}
This 这个
Type currentType = parameters[index];
already gives you the type of the parameter. 已经为您提供了参数的类型。
Calling 呼唤
currentType.getClass()
returns a Class
object for the type Type
, not what you want. 返回类型为Type
的Class
对象,而不是您想要的类型。
Class
is a Type
subtype. Class
是Type
子类型。 You can check if the Type
reference you have is an instanceof
of Class
and then perform your isAssignableFrom
. 您可以检查您拥有的Type
引用是否是Class
的instanceof
,然后执行isAssignableFrom
。
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