Java 类org.mozilla.javascript.NativeJavaClass 实例源码

/**
 * Converts JavaScript object to Java object, e.g. HostedJavaObject into wrapped Java object.
 * 
 * @param jsObj JavaScript object to be converted.
 * @return Converted Java object.
 */
public static Object jsToJava(Object jsObj) {
    if (jsObj instanceof Wrapper) {
        Wrapper njb = (Wrapper) jsObj;

        if (njb instanceof NativeJavaClass) {
            return njb;
        }

        Object obj = njb.unwrap();
        if (obj instanceof Number || obj instanceof String ||
            obj instanceof Boolean || obj instanceof Character) {
            return njb;
        } else {
            return obj;
        }
    } else {
        return jsObj;
    }
}

/**
 * Converts JavaScript object to Java object, e.g. HostedJavaObject into wrapped Java object.
 * 
 * @param jsObj JavaScript object to be converted.
 * @return Converted Java object.
 */
public static Object jsToJava(Object jsObj) {
    if (jsObj instanceof Wrapper) {
        Wrapper njb = (Wrapper) jsObj;

        if (njb instanceof NativeJavaClass) {
            return njb;
        }

        Object obj = njb.unwrap();
        if (obj instanceof Number || obj instanceof String ||
            obj instanceof Boolean || obj instanceof Character) {
            return njb;
        } else {
            return obj;
        }
    } else {
        return jsObj;
    }
}

/**
* We convert script values to the nearest Java value.
* We unwrap wrapped Java objects so that access from
* Bindings.get() would return "workable" value for Java.
* But, at the same time, we need to make few special cases
* and hence the following function is used.
*/
private Object jsToJava(Object jsObj) {
    if (jsObj instanceof Wrapper) {
        Wrapper njb = (Wrapper) jsObj;
        /* importClass feature of ImporterTopLevel puts
         * NativeJavaClass in global scope. If we unwrap
         * it, importClass won't work.
         */
        if (njb instanceof NativeJavaClass) {
            return njb;
        }

        /* script may use Java primitive wrapper type objects
         * (such as java.lang.Integer, java.lang.Boolean etc)
         * explicitly. If we unwrap, then these script objects
         * will become script primitive types. For example,
         * 
         *    var x = new java.lang.Double(3.0); print(typeof x);
         * 
         * will print 'number'. We don't want that to happen.
         */
        Object obj = njb.unwrap();
        if (obj instanceof Number || obj instanceof String ||
            obj instanceof Boolean || obj instanceof Character) {
            // special type wrapped -- we just leave it as is.
            return njb;
        } else {
            // return unwrapped object for any other object.
            return obj;
        }
    } else { // not-a-Java-wrapper
        return jsObj;
    }
}

/**
* We convert script values to the nearest Java value.
* We unwrap wrapped Java objects so that access from
* Bindings.get() would return "workable" value for Java.
* But, at the same time, we need to make few special cases
* and hence the following function is used.
*/
private Object jsToJava(Object jsObj) {
    if (jsObj instanceof Wrapper) {
        Wrapper njb = (Wrapper) jsObj;
        /* importClass feature of ImporterTopLevel puts
         * NativeJavaClass in global scope. If we unwrap
         * it, importClass won't work.
         */
        if (njb instanceof NativeJavaClass) {
            return njb;
        }

        /* script may use Java primitive wrapper type objects
         * (such as java.lang.Integer, java.lang.Boolean etc)
         * explicitly. If we unwrap, then these script objects
         * will become script primitive types. For example,
         *
         *    var x = new java.lang.Double(3.0); print(typeof x);
         *
         * will print 'number'. We don't want that to happen.
         */
        Object obj = njb.unwrap();
        if (obj instanceof Number || obj instanceof String ||
            obj instanceof Boolean || obj instanceof Character) {
            // special type wrapped -- we just leave it as is.
            return njb;
        } else {
            // return unwrapped object for any other object.
            return obj;
        }
    } else { // not-a-Java-wrapper
        return jsObj;
    }
}