Reflector.java revision 1829:dbe6b239d681 
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.Executable;
30import java.lang.reflect.Field;
31import java.lang.reflect.Method;
32import java.lang.reflect.Module;
33import jdk.nashorn.internal.runtime.Context;
34
35/**
36 * Few tests reflectively invoke or read fields of Nashorn classes
37 * and objects - but of packages that are not exported to any module!
38 * But, those packages are qualified exported to test [java] code
39 * such as this class. So, test scripts can invoke the methods of this
40 * class instead.
41 */
42public final class Reflector {
43    private Reflector() {}
44    private static final Module NASHORN_MOD = Context.class.getModule();
45
46    public static void setAccessible(Executable e) {
47        if (e.getDeclaringClass().getModule() != NASHORN_MOD) {
48            throw new RuntimeException(e + " is not from Nashorn module");
49        }
50
51        e.setAccessible(true);
52    }
53
54    public static void setAccessible(Field f) {
55        if (f.getDeclaringClass().getModule() != NASHORN_MOD) {
56            throw new RuntimeException(f + " is not from Nashorn module");
57        }
58
59        f.setAccessible(true);
60    }
61
62    public static Object invoke(final Method m, final Object self, final Object...args) {
63        if (m.getDeclaringClass().getModule() != NASHORN_MOD) {
64            throw new RuntimeException(m + " is not from Nashorn module");
65        }
66
67        try {
68            return m.invoke(self, args);
69        } catch (final Exception e) {
70            if (e instanceof RuntimeException) {
71                throw (RuntimeException)e;
72            } else {
73                throw new RuntimeException(e);
74            }
75        }
76    }
77
78    public static Object newInstance(final Constructor c, final Object...args) {
79        if (c.getDeclaringClass().getModule() != NASHORN_MOD) {
80            throw new RuntimeException(c + " is not from Nashorn module");
81        }
82
83        try {
84            return c.newInstance(args);
85        } catch (final Exception e) {
86            if (e instanceof RuntimeException) {
87                throw (RuntimeException)e;
88            } else {
89                throw new RuntimeException(e);
90            }
91        }
92    }
93
94    public static Object get(final Field f, final Object self) {
95        if (f.getDeclaringClass().getModule() != NASHORN_MOD) {
96            throw new RuntimeException(f + " is not from Nashorn module");
97        }
98
99        try {
100            return f.get(self);
101        } catch (final Exception e) {
102            if (e instanceof RuntimeException) {
103                throw (RuntimeException)e;
104            } else {
105                throw new RuntimeException(e);
106            }
107        }
108    }
109}
110