Reflector.java revision 1777:987ce060a647 
1/*
2 * Copyright (c) 2016, 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
26package jdk.nashorn.test.models;
27
28import java.lang.reflect.Constructor;
29import java.lang.reflect.Field;
30import java.lang.reflect.Method;
31import java.lang.reflect.Module;
32import jdk.nashorn.internal.runtime.Context;
33
34/**
35 * Few tests reflectively invoke or read fields of Nashorn classes
36 * and objects - but of packages that are not exported to any module!
37 * But, those packages are qualified exported to test [java] code
38 * such as this class. So, test scripts can invoke the methods of this
39 * class instead.
40 */
41public final class Reflector {
42    private Reflector() {}
43    private static final Module NASHORN_MOD = Context.class.getModule();
44
45    public static Object invoke(Method m, Object self, Object...args) {
46        if (m.getDeclaringClass().getModule() != NASHORN_MOD) {
47            throw new RuntimeException(m + " is not from Nashorn module");
48        }
49
50        try {
51            return m.invoke(self, args);
52        } catch (final Exception e) {
53            if (e instanceof RuntimeException) {
54                throw (RuntimeException)e;
55            } else {
56                throw new RuntimeException(e);
57            }
58        }
59    }
60
61    public static Object newInstance(Constructor c, Object...args) {
62        if (c.getDeclaringClass().getModule() != NASHORN_MOD) {
63            throw new RuntimeException(c + " is not from Nashorn module");
64        }
65
66        try {
67            return c.newInstance(args);
68        } catch (final Exception e) {
69            if (e instanceof RuntimeException) {
70                throw (RuntimeException)e;
71            } else {
72                throw new RuntimeException(e);
73            }
74        }
75    }
76
77    public static Object get(Field f, Object self) {
78        if (f.getDeclaringClass().getModule() != NASHORN_MOD) {
79            throw new RuntimeException(f + " is not from Nashorn module");
80        }
81
82        try {
83            return f.get(self);
84        } catch (final Exception e) {
85            if (e instanceof RuntimeException) {
86                throw (RuntimeException)e;
87            } else {
88                throw new RuntimeException(e);
89            }
90        }
91    }
92}
93