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new Java objects in JavaScript
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import javax.script._ | |
class foo(s: String) | |
// call Class.forName not in JavaScript. | |
// calling Class.forName in JavaScript does not work. | |
object ClassForName { | |
def apply(className: String) = Class.forName(className) | |
} | |
object GetClass { | |
def apply(x: AnyRef) = x.getClass | |
} | |
object Rhino { | |
def main(args: Array[String]) { | |
val engine = new ScriptEngineManager(null).getEngineByName("JavaScript") | |
engine.put("class_for_name", ClassForName) | |
engine.put("get_class", GetClass) | |
try { | |
engine.eval(""" | |
function construct(class_name) { | |
var class_obj = class_for_name.apply(class_name) | |
return function() { | |
// convert arguments object to array | |
var args = new Array(arguments.length) | |
for (var i = 0; i < args.length; ++i) { | |
args[i] = arguments[i] | |
} | |
var argumentClasses = new Array(args.length) | |
for (var i = 0; i < args.length; ++i) { | |
argumentClasses[i] = get_class.apply(args[i]) | |
} | |
var constructor = class_obj.getConstructor(argumentClasses); | |
return constructor.newInstance(args) | |
} | |
} | |
var s = construct("foo")("abc"); | |
print(s) | |
""") | |
} catch { | |
case e => println(e) | |
} | |
} | |
} |
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