/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
package org.mozilla.javascript.jdk13;
import java.lang.reflect.AccessibleObject;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Member;
import java.lang.reflect.Proxy;
import org.mozilla.javascript.*;
public class VMBridge_jdk13 extends VMBridge
{
private ThreadLocal<Object[]> contextLocal = new ThreadLocal<Object[]>();
@Override
protected Object getThreadContextHelper()
{
// To make subsequent batch calls to getContext/setContext faster
// associate permanently one element array with contextLocal
// so getContext/setContext would need just to read/write the first
// array element.
// Note that it is necessary to use Object[], not Context[] to allow
// garbage collection of Rhino classes. For details see comments
// by Attila Szegedi in
// https://bugzilla.mozilla.org/show_bug.cgi?id=281067#c5
Object[] storage = contextLocal.get();
if (storage == null) {
storage = new Object[1];
contextLocal.set(storage);
}
return storage;
}
@Override
protected Context getContext(Object contextHelper)
{
Object[] storage = (Object[])contextHelper;
return (Context)storage[0];
}
@Override
protected void setContext(Object contextHelper, Context cx)
{
Object[] storage = (Object[])contextHelper;
storage[0] = cx;
}
@Override
protected ClassLoader getCurrentThreadClassLoader()
{
return Thread.currentThread().getContextClassLoader();
}
@Override
protected boolean tryToMakeAccessible(Object accessibleObject)
{
if (!(accessibleObject instanceof AccessibleObject)) {
return false;
}
AccessibleObject accessible = (AccessibleObject)accessibleObject;
if (accessible.isAccessible()) {
return true;
}
try {
accessible.setAccessible(true);
} catch (Exception ex) { }
return accessible.isAccessible();
}
@Override
protected Object getInterfaceProxyHelper(ContextFactory cf,
Class<?>[] interfaces)
{
// XXX: How to handle interfaces array withclasses from different
// class loaders? Using cf.getApplicationClassLoader() ?
ClassLoader loader = interfaces[0].getClassLoader();
Class<?> cl = Proxy.getProxyClass(loader, interfaces);
Constructor<?> c;
try {
c = cl.getConstructor(new Class[] { InvocationHandler.class });
} catch (NoSuchMethodException ex) {
// Should not happen
throw Kit.initCause(new IllegalStateException(), ex);
}
return c;
}
@Override
protected Object newInterfaceProxy(Object proxyHelper,
final ContextFactory cf,
final InterfaceAdapter adapter,
final Object target,
final Scriptable topScope)
{
Constructor<?> c = (Constructor<?>)proxyHelper;
InvocationHandler handler = new InvocationHandler() {
public Object invoke(Object proxy,
Method method,
Object[] args)
{
// In addition to methods declared in the interface, proxies
// also route some java.lang.Object methods through the
// invocation handler.
if (method.getDeclaringClass() == Object.class) {
String methodName = method.getName();
if (methodName.equals("equals")) {
Object other = args[0];
// Note: we could compare a proxy and its wrapped function
// as equal here but that would break symmetry of equal().
// The reason == suffices here is that proxies are cached
// in ScriptableObject (see NativeJavaObject.coerceType())
return Boolean.valueOf(proxy == other);
}
if (methodName.equals("hashCode")) {
return Integer.valueOf(target.hashCode());
}
if (methodName.equals("toString")) {
return "Proxy[" + target.toString() + "]";
}
}
return adapter.invoke(cf, target, topScope, proxy, method, args);
}
};
Object proxy;
try {
proxy = c.newInstance(handler);
} catch (InvocationTargetException ex) {
throw Context.throwAsScriptRuntimeEx(ex);
} catch (IllegalAccessException ex) {
// Should not happen
throw Kit.initCause(new IllegalStateException(), ex);
} catch (InstantiationException ex) {
// Should not happen
throw Kit.initCause(new IllegalStateException(), ex);
}
return proxy;
}
@Override
protected boolean isVarArgs(Member member) {
return false;
}
}