1/*
2 * Copyright (c) 2002, 2012, 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 javax.activation;
27
28import java.security.*;
29import java.net.*;
30import java.io.*;
31import java.util.*;
32
33/**
34 * Security related methods that only work on J2SE 1.2 and newer.
35 *
36 * @since 1.6
37 */
38class SecuritySupport {
39
40    private SecuritySupport() {
41        // private constructor, can't create an instance
42    }
43
44    public static ClassLoader getContextClassLoader() {
45        return (ClassLoader)
46                AccessController.doPrivileged(new PrivilegedAction() {
47            public Object run() {
48                ClassLoader cl = null;
49                try {
50                    cl = Thread.currentThread().getContextClassLoader();
51                } catch (SecurityException ex) { }
52                return cl;
53            }
54        });
55    }
56
57    public static InputStream getResourceAsStream(final Class c,
58                                final String name) throws IOException {
59        try {
60            return (InputStream)
61                AccessController.doPrivileged(new PrivilegedExceptionAction() {
62                    public Object run() throws IOException {
63                        return c.getResourceAsStream(name);
64                    }
65                });
66        } catch (PrivilegedActionException e) {
67            throw (IOException)e.getException();
68        }
69    }
70
71    public static URL[] getResources(final ClassLoader cl, final String name) {
72        return (URL[])
73                AccessController.doPrivileged(new PrivilegedAction() {
74            public Object run() {
75                URL[] ret = null;
76                try {
77                    List v = new ArrayList();
78                    Enumeration e = cl.getResources(name);
79                    while (e != null && e.hasMoreElements()) {
80                        URL url = (URL)e.nextElement();
81                        if (url != null)
82                            v.add(url);
83                    }
84                    if (v.size() > 0) {
85                        ret = new URL[v.size()];
86                        ret = (URL[])v.toArray(ret);
87                    }
88                } catch (IOException ioex) {
89                } catch (SecurityException ex) { }
90                return ret;
91            }
92        });
93    }
94
95    public static URL[] getSystemResources(final String name) {
96        return (URL[])
97                AccessController.doPrivileged(new PrivilegedAction() {
98            public Object run() {
99                URL[] ret = null;
100                try {
101                    List v = new ArrayList();
102                    Enumeration e = ClassLoader.getSystemResources(name);
103                    while (e != null && e.hasMoreElements()) {
104                        URL url = (URL)e.nextElement();
105                        if (url != null)
106                            v.add(url);
107                    }
108                    if (v.size() > 0) {
109                        ret = new URL[v.size()];
110                        ret = (URL[])v.toArray(ret);
111                    }
112                } catch (IOException ioex) {
113                } catch (SecurityException ex) { }
114                return ret;
115            }
116        });
117    }
118
119    public static InputStream openStream(final URL url) throws IOException {
120        try {
121            return (InputStream)
122                AccessController.doPrivileged(new PrivilegedExceptionAction() {
123                    public Object run() throws IOException {
124                        return url.openStream();
125                    }
126                });
127        } catch (PrivilegedActionException e) {
128            throw (IOException)e.getException();
129        }
130    }
131}
132