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 | } | ||