Showing the changes to java/pkg/com/sun/script/util/InterfaceImplementor.java (1 of 18352 files). Show all
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| 1 | +/* | |
| 2 | + * Copyright (c) 2005, 2011, Oracle and/or its affiliates. All rights reserved. | |
| 3 | + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 | + * | |
| 5 | + * This code is free software; you can redistribute it and/or modify it | |
| 6 | + * under the terms of the GNU General Public License version 2 only, as | |
| 7 | + * published by the Free Software Foundation. Oracle designates this | |
| 8 | + * particular file as subject to the "Classpath" exception as provided | |
| 9 | + * by Oracle in the LICENSE file that accompanied this code. | |
| 10 | + * | |
| 11 | + * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 12 | + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 | + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 | + * version 2 for more details (a copy is included in the LICENSE file that | |
| 15 | + * accompanied this code). | |
| 16 | + * | |
| 17 | + * You should have received a copy of the GNU General Public License version | |
| 18 | + * 2 along with this work; if not, write to the Free Software Foundation, | |
| 19 | + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 20 | + * | |
| 21 | + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 | + * or visit www.oracle.com if you need additional information or have any | |
| 23 | + * questions. | |
| 24 | + */ | |
| 25 | + | |
| 26 | +package com.sun.script.util; | |
| 27 | + | |
| 28 | +import javax.script.*; | |
| 29 | +import java.lang.reflect.*; | |
| 30 | +import java.security.*; | |
| 31 | + | |
| 32 | +/* | |
| 33 | + * java.lang.reflect.Proxy based interface implementor. This is meant | |
| 34 | + * to be used to implement Invocable.getInterface. | |
| 35 | + * | |
| 36 | + * @author Mike Grogan | |
| 37 | + * @since 1.6 | |
| 38 | + */ | |
| 39 | +public class InterfaceImplementor { | |
| 40 | + | |
| 41 | + private Invocable engine; | |
| 42 | + | |
| 43 | + /** Creates a new instance of Invocable */ | |
| 44 | + public InterfaceImplementor(Invocable engine) { | |
| 45 | + this.engine = engine; | |
| 46 | + } | |
| 47 | + | |
| 48 | + private final class InterfaceImplementorInvocationHandler | |
| 49 | + implements InvocationHandler { | |
| 50 | + private Object thiz; | |
| 51 | + private AccessControlContext accCtxt; | |
| 52 | + | |
| 53 | + public InterfaceImplementorInvocationHandler(Object thiz, | |
| 54 | + AccessControlContext accCtxt) { | |
| 55 | + this.thiz = thiz; | |
| 56 | + this.accCtxt = accCtxt; | |
| 57 | + } | |
| 58 | + | |
| 59 | + public Object invoke(Object proxy , Method method, Object[] args) | |
| 60 | + throws java.lang.Throwable { | |
| 61 | + // give chance to convert input args | |
| 62 | + args = convertArguments(method, args); | |
| 63 | + Object result; | |
| 64 | + final Method m = method; | |
| 65 | + final Object[] a = args; | |
| 66 | + result = AccessController.doPrivileged(new PrivilegedExceptionAction<Object>() { | |
| 67 | + public Object run() throws Exception { | |
| 68 | + if (thiz == null) { | |
| 69 | + return engine.invokeFunction(m.getName(), a); | |
| 70 | + } else { | |
| 71 | + return engine.invokeMethod(thiz, m.getName(), a); | |
| 72 | + } | |
| 73 | + } | |
| 74 | + }, accCtxt); | |
| 75 | + // give chance to convert the method result | |
| 76 | + return convertResult(method, result); | |
| 77 | + } | |
| 78 | + } | |
| 79 | + | |
| 80 | + public <T> T getInterface(Object thiz, Class<T> iface) | |
| 81 | + throws ScriptException { | |
| 82 | + if (iface == null || !iface.isInterface()) { | |
| 83 | + throw new IllegalArgumentException("interface Class expected"); | |
| 84 | + } | |
| 85 | + if (! isImplemented(thiz, iface)) { | |
| 86 | + return null; | |
| 87 | + } | |
| 88 | + AccessControlContext accCtxt = AccessController.getContext(); | |
| 89 | + return iface.cast(Proxy.newProxyInstance(iface.getClassLoader(), | |
| 90 | + new Class[]{iface}, | |
| 91 | + new InterfaceImplementorInvocationHandler(thiz, accCtxt))); | |
| 92 | + } | |
| 93 | + | |
| 94 | + protected boolean isImplemented(Object thiz, Class<?> iface) { | |
| 95 | + return true; | |
| 96 | + } | |
| 97 | + | |
| 98 | + // called to convert method result after invoke | |
| 99 | + protected Object convertResult(Method method, Object res) | |
| 100 | + throws ScriptException { | |
| 101 | + // default is identity conversion | |
| 102 | + return res; | |
| 103 | + } | |
| 104 | + | |
| 105 | + // called to convert method arguments before invoke | |
| 106 | + protected Object[] convertArguments(Method method, Object[] args) | |
| 107 | + throws ScriptException { | |
| 108 | + // default is identity conversion | |
| 109 | + return args; | |
| 110 | + } | |
| 111 | +} | |