1/*
2 * Copyright (c) 2015, 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 */
25package com.sun.jmx.mbeanserver;
26
27import java.lang.reflect.Constructor;
28import java.lang.reflect.Method;
29import jdk.internal.misc.JavaBeansAccess;
30import jdk.internal.misc.SharedSecrets;
31
32/**
33 * A centralized place for gaining access to java.beans related functionality -
34 * if available.
35 */
36class JavaBeansAccessor {
37    static {
38        // ensure that java.beans.Introspector is initialized (if present)
39        // it will fill in the SharedSecrets
40        try {
41            Class.forName("java.beans.Introspector", true,
42                          JavaBeansAccessor.class.getClassLoader());
43        } catch (ClassNotFoundException ignore) { }
44    }
45
46    private static JavaBeansAccess getJavaBeansAccess() {
47        return SharedSecrets.getJavaBeansAccess();
48    }
49
50    static boolean isAvailable() {
51        return getJavaBeansAccess() != null;
52    }
53
54    /**
55     * Returns the getter method for a property of the given name
56     * @param clazz The JavaBeans class
57     * @param property The property name
58     * @return The resolved property getter name or null
59     * @throws Exception
60     */
61    static Method getReadMethod(Class<?> clazz, String property) throws Exception {
62        JavaBeansAccess jba = getJavaBeansAccess();
63        return jba != null ? jba.getReadMethod(clazz, property) : null;
64    }
65
66    /**
67     * Return the <b>value</b> attribute of the associated
68     * <code>@ConstructorProperties</code> annotation if that is present.
69     * @param ctr The constructor to extract the annotation value from
70     * @return The {@code value} attribute of the <code>@ConstructorProperties</code>
71     *         annotation or {@code null} if the constructor is not annotated by
72     *         this annotation or the annotation is not accessible.
73     */
74    static String[] getConstructorPropertiesValue(Constructor<?> ctr) {
75        JavaBeansAccess jba = getJavaBeansAccess();
76        return jba != null ? jba.getConstructorPropertiesValue(ctr) : null;
77    }
78}
79