public static Function getFunction(Scriptable obj, String functionName) {
Object x = ScriptableObject.getProperty(obj, functionName);
if (x == Scriptable.NOT_FOUND) {
// This method used to swallow the exception from calling
// an undefined method. People have come to depend on this
// somewhat dubious behavior. It allows people to avoid
// implementing listener methods that they don't care about,
// for instance.
return null;
}
if (!(x instanceof Function)) throw ScriptRuntime.notFunctionError(x, functionName);
return (Function) x;
}
private static ObjToIntMap getObjectFunctionNames(Scriptable obj) {
Object[] ids = ScriptableObject.getPropertyIds(obj);
ObjToIntMap map = new ObjToIntMap(ids.length);
for (int i = 0; i != ids.length; ++i) {
if (!(ids[i] instanceof String)) continue;
String id = (String) ids[i];
Object value = ScriptableObject.getProperty(obj, id);
if (value instanceof Function) {
Function f = (Function) value;
int length = ScriptRuntime.toInt32(ScriptableObject.getProperty(f, "length"));
if (length < 0) {
length = 0;
}
map.put(id, length);
}
}
return map;
}
static Object js_createAdapter(Context cx, Scriptable scope, Object[] args) {
int N = args.length;
if (N == 0) {
throw ScriptRuntime.typeError0("msg.adapter.zero.args");
}
// Expected arguments:
// Any number of NativeJavaClass objects representing the super-class
// and/or interfaces to implement, followed by one NativeObject providing
// the implementation, followed by any number of arguments to pass on
// to the (super-class) constructor.
int classCount;
for (classCount = 0; classCount < N - 1; classCount++) {
Object arg = args[classCount];
// We explicitly test for NativeObject here since checking for
// instanceof ScriptableObject or !(instanceof NativeJavaClass)
// would fail for a Java class that isn't found in the class path
// as NativeJavaPackage extends ScriptableObject.
if (arg instanceof NativeObject) {
break;
}
if (!(arg instanceof NativeJavaClass)) {
throw ScriptRuntime.typeError2(
"msg.not.java.class.arg", String.valueOf(classCount), ScriptRuntime.toString(arg));
}
}
Class<?> superClass = null;
Class<?>[] intfs = new Class[classCount];
int interfaceCount = 0;
for (int i = 0; i < classCount; ++i) {
Class<?> c = ((NativeJavaClass) args[i]).getClassObject();
if (!c.isInterface()) {
if (superClass != null) {
throw ScriptRuntime.typeError2("msg.only.one.super", superClass.getName(), c.getName());
}
superClass = c;
} else {
intfs[interfaceCount++] = c;
}
}
if (superClass == null) {
superClass = ScriptRuntime.ObjectClass;
}
Class<?>[] interfaces = new Class[interfaceCount];
System.arraycopy(intfs, 0, interfaces, 0, interfaceCount);
// next argument is implementation, must be scriptable
Scriptable obj = ScriptableObject.ensureScriptable(args[classCount]);
Class<?> adapterClass = getAdapterClass(scope, superClass, interfaces, obj);
Object adapter;
int argsCount = N - classCount - 1;
try {
if (argsCount > 0) {
// Arguments contain parameters for super-class constructor.
// We use the generic Java method lookup logic to find and
// invoke the right constructor.
Object[] ctorArgs = new Object[argsCount + 2];
ctorArgs[0] = obj;
ctorArgs[1] = cx.getFactory();
System.arraycopy(args, classCount + 1, ctorArgs, 2, argsCount);
// TODO: cache class wrapper?
NativeJavaClass classWrapper = new NativeJavaClass(scope, adapterClass, true);
NativeJavaMethod ctors = classWrapper.members.ctors;
int index = ctors.findCachedFunction(cx, ctorArgs);
if (index < 0) {
String sig = NativeJavaMethod.scriptSignature(args);
throw Context.reportRuntimeError2("msg.no.java.ctor", adapterClass.getName(), sig);
}
// Found the constructor, so try invoking it.
adapter = NativeJavaClass.constructInternal(ctorArgs, ctors.methods[index]);
} else {
Class<?>[] ctorParms = {ScriptRuntime.ScriptableClass, ScriptRuntime.ContextFactoryClass};
Object[] ctorArgs = {obj, cx.getFactory()};
adapter = adapterClass.getConstructor(ctorParms).newInstance(ctorArgs);
}
Object self = getAdapterSelf(adapterClass, adapter);
// Return unwrapped JavaAdapter if it implements Scriptable
if (self instanceof Wrapper) {
Object unwrapped = ((Wrapper) self).unwrap();
if (unwrapped instanceof Scriptable) {
if (unwrapped instanceof ScriptableObject) {
ScriptRuntime.setObjectProtoAndParent((ScriptableObject) unwrapped, scope);
}
return unwrapped;
}
}
return self;
} catch (Exception ex) {
throw Context.throwAsScriptRuntimeEx(ex);
}
}