本文整理汇总了Java中jdk.nashorn.internal.runtime.JSType.nullOrUndefined方法的典型用法代码示例。如果您正苦于以下问题:Java JSType.nullOrUndefined方法的具体用法?Java JSType.nullOrUndefined怎么用?Java JSType.nullOrUndefined使用的例子?那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类jdk.nashorn.internal.runtime.JSType
的用法示例。
在下文中一共展示了JSType.nullOrUndefined方法的1个代码示例,这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞,您的评价将有助于系统推荐出更棒的Java代码示例。
示例1: checkFunction
import jdk.nashorn.internal.runtime.JSType; //导入方法依赖的package包/类
/**
* Checks if the passed object, which is supposed to be a callee retrieved
* through applying the GET_METHOD_PROPERTY operation on the delegate, is
* a ScriptFunction, or null or undefined. These are the only allowed values
* for adapter method implementations, so in case it is neither, it throws
* a type error. Note that this restriction is somewhat artificial; as the
* CALL dynamic operation could invoke any Nashorn callable. We are
* restricting adapters to actual ScriptFunction objects for now though.
* @param callee the callee to check
* @param name the name of the function
* @return the callee cast to a ScriptFunction, or null if it was null or undefined.
* @throws ECMAException representing a JS TypeError with "not.a.function"
* message if the passed callee is neither a script function, nor null, nor
* undefined.
*/
public static ScriptFunction checkFunction(final Object callee, final String name) {
if (callee instanceof ScriptFunction) {
return (ScriptFunction)callee;
} else if (JSType.nullOrUndefined(callee)) {
return null;
}
throw typeError("not.a.function.value", name, ScriptRuntime.safeToString(callee));
}