| /* |
| * Copyright (c) 2005, 2011, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package com.sun.script.util; |
| |
| import javax.script.*; |
| import java.lang.reflect.*; |
| import java.security.*; |
| |
| /* |
| * java.lang.reflect.Proxy based interface implementor. This is meant |
| * to be used to implement Invocable.getInterface. |
| * |
| * @author Mike Grogan |
| * @since 1.6 |
| */ |
| public class InterfaceImplementor { |
| |
| private Invocable engine; |
| |
| /** Creates a new instance of Invocable */ |
| public InterfaceImplementor(Invocable engine) { |
| this.engine = engine; |
| } |
| |
| private final class InterfaceImplementorInvocationHandler |
| implements InvocationHandler { |
| private Object thiz; |
| private AccessControlContext accCtxt; |
| |
| public InterfaceImplementorInvocationHandler(Object thiz, |
| AccessControlContext accCtxt) { |
| this.thiz = thiz; |
| this.accCtxt = accCtxt; |
| } |
| |
| public Object invoke(Object proxy , Method method, Object[] args) |
| throws java.lang.Throwable { |
| // give chance to convert input args |
| args = convertArguments(method, args); |
| Object result; |
| final Method m = method; |
| final Object[] a = args; |
| result = AccessController.doPrivileged(new PrivilegedExceptionAction<Object>() { |
| public Object run() throws Exception { |
| if (thiz == null) { |
| return engine.invokeFunction(m.getName(), a); |
| } else { |
| return engine.invokeMethod(thiz, m.getName(), a); |
| } |
| } |
| }, accCtxt); |
| // give chance to convert the method result |
| return convertResult(method, result); |
| } |
| } |
| |
| public <T> T getInterface(Object thiz, Class<T> iface) |
| throws ScriptException { |
| if (iface == null || !iface.isInterface()) { |
| throw new IllegalArgumentException("interface Class expected"); |
| } |
| if (! isImplemented(thiz, iface)) { |
| return null; |
| } |
| AccessControlContext accCtxt = AccessController.getContext(); |
| return iface.cast(Proxy.newProxyInstance(iface.getClassLoader(), |
| new Class[]{iface}, |
| new InterfaceImplementorInvocationHandler(thiz, accCtxt))); |
| } |
| |
| protected boolean isImplemented(Object thiz, Class<?> iface) { |
| return true; |
| } |
| |
| // called to convert method result after invoke |
| protected Object convertResult(Method method, Object res) |
| throws ScriptException { |
| // default is identity conversion |
| return res; |
| } |
| |
| // called to convert method arguments before invoke |
| protected Object[] convertArguments(Method method, Object[] args) |
| throws ScriptException { |
| // default is identity conversion |
| return args; |
| } |
| } |