1/*
2 * Copyright (c) 2005, 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 */
25
26package javax.xml.xpath;
27
28import java.net.URL;
29import java.security.*;
30import java.io.*;
31
32/**
33 * This class is duplicated for each JAXP subpackage so keep it in sync.
34 * It is package private and therefore is not exposed as part of the JAXP
35 * API.
36 *
37 * Security related methods that only work on J2SE 1.2 and newer.
38 */
39class SecuritySupport  {
40
41
42    ClassLoader getContextClassLoader() {
43        return AccessController.doPrivileged(new PrivilegedAction<>() {
44            @Override
45            public ClassLoader run() {
46                ClassLoader cl = null;
47                try {
48                    cl = Thread.currentThread().getContextClassLoader();
49                } catch (SecurityException ex) { }
50                return cl;
51            }
52        });
53    }
54
55    String getSystemProperty(final String propName) {
56        return AccessController.doPrivileged(new PrivilegedAction<>() {
57            @Override
58            public String run() {
59                return System.getProperty(propName);
60            }
61        });
62    }
63
64    FileInputStream getFileInputStream(final File file)
65        throws FileNotFoundException
66    {
67        try {
68            return AccessController.doPrivileged(
69                new PrivilegedExceptionAction<>() {
70                    @Override
71                    public FileInputStream run() throws FileNotFoundException {
72                        return new FileInputStream(file);
73                    }
74                });
75        } catch (PrivilegedActionException e) {
76            throw (FileNotFoundException)e.getException();
77        }
78    }
79
80    // Used for debugging purposes
81    String getClassSource(Class<?> cls) {
82        return AccessController.doPrivileged(new PrivilegedAction<>() {
83            @Override
84            public String run() {
85                CodeSource cs = cls.getProtectionDomain().getCodeSource();
86                if (cs != null) {
87                   URL loc = cs.getLocation();
88                   return loc != null ? loc.toString() : "(no location)";
89                } else {
90                   return "(no code source)";
91                }
92            }
93        });
94    }
95
96    boolean doesFileExist(final File f) {
97        return AccessController.doPrivileged(new PrivilegedAction<>() {
98            @Override
99            public Boolean run() {
100                return f.exists();
101            }
102        });
103    }
104
105}
106