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Java JSType.nullOrUndefined方法代码示例

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));
}
 
开发者ID:AdoptOpenJDK,项目名称:openjdk-jdk10,代码行数:24,代码来源:JavaAdapterServices.java


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