Source Code Cross Referenced for SecuritySupport.java in  » XML » xerces-2_9_1 » org » apache » xerces » dom » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » XML » xerces 2_9_1 » org.apache.xerces.dom 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Licensed to the Apache Software Foundation (ASF) under one or more
003:         * contributor license agreements.  See the NOTICE file distributed with
004:         * this work for additional information regarding copyright ownership.
005:         * The ASF licenses this file to You under the Apache License, Version 2.0
006:         * (the "License"); you may not use this file except in compliance with
007:         * the License.  You may obtain a copy of the License at
008:         * 
009:         *      http://www.apache.org/licenses/LICENSE-2.0
010:         * 
011:         * Unless required by applicable law or agreed to in writing, software
012:         * distributed under the License is distributed on an "AS IS" BASIS,
013:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014:         * See the License for the specific language governing permissions and
015:         * limitations under the License.
016:         */
017:
018:        package org.apache.xerces.dom;
019:
020:        import java.io.File;
021:        import java.io.FileInputStream;
022:        import java.io.FileNotFoundException;
023:        import java.io.InputStream;
024:
025:        import java.security.AccessController;
026:        import java.security.PrivilegedAction;
027:        import java.security.PrivilegedActionException;
028:        import java.security.PrivilegedExceptionAction;
029:
030:        /**
031:         * This class is duplicated for each subpackage so keep it in sync.
032:         * It is package private and therefore is not exposed as part of any API.
033:         * 
034:         * @xerces.internal
035:         */
036:        final class SecuritySupport {
037:
038:            static ClassLoader getContextClassLoader() {
039:                return (ClassLoader) AccessController
040:                        .doPrivileged(new PrivilegedAction() {
041:                            public Object run() {
042:                                ClassLoader cl = null;
043:                                try {
044:                                    cl = Thread.currentThread()
045:                                            .getContextClassLoader();
046:                                } catch (SecurityException ex) {
047:                                }
048:                                return cl;
049:                            }
050:                        });
051:            }
052:
053:            static ClassLoader getSystemClassLoader() {
054:                return (ClassLoader) AccessController
055:                        .doPrivileged(new PrivilegedAction() {
056:                            public Object run() {
057:                                ClassLoader cl = null;
058:                                try {
059:                                    cl = ClassLoader.getSystemClassLoader();
060:                                } catch (SecurityException ex) {
061:                                }
062:                                return cl;
063:                            }
064:                        });
065:            }
066:
067:            static ClassLoader getParentClassLoader(final ClassLoader cl) {
068:                return (ClassLoader) AccessController
069:                        .doPrivileged(new PrivilegedAction() {
070:                            public Object run() {
071:                                ClassLoader parent = null;
072:                                try {
073:                                    parent = cl.getParent();
074:                                } catch (SecurityException ex) {
075:                                }
076:
077:                                // eliminate loops in case of the boot
078:                                // ClassLoader returning itself as a parent
079:                                return (parent == cl) ? null : parent;
080:                            }
081:                        });
082:            }
083:
084:            static String getSystemProperty(final String propName) {
085:                return (String) AccessController
086:                        .doPrivileged(new PrivilegedAction() {
087:                            public Object run() {
088:                                return System.getProperty(propName);
089:                            }
090:                        });
091:            }
092:
093:            static FileInputStream getFileInputStream(final File file)
094:                    throws FileNotFoundException {
095:                try {
096:                    return (FileInputStream) AccessController
097:                            .doPrivileged(new PrivilegedExceptionAction() {
098:                                public Object run()
099:                                        throws FileNotFoundException {
100:                                    return new FileInputStream(file);
101:                                }
102:                            });
103:                } catch (PrivilegedActionException e) {
104:                    throw (FileNotFoundException) e.getException();
105:                }
106:            }
107:
108:            static InputStream getResourceAsStream(final ClassLoader cl,
109:                    final String name) {
110:                return (InputStream) AccessController
111:                        .doPrivileged(new PrivilegedAction() {
112:                            public Object run() {
113:                                InputStream ris;
114:                                if (cl == null) {
115:                                    ris = ClassLoader
116:                                            .getSystemResourceAsStream(name);
117:                                } else {
118:                                    ris = cl.getResourceAsStream(name);
119:                                }
120:                                return ris;
121:                            }
122:                        });
123:            }
124:
125:            static boolean getFileExists(final File f) {
126:                return ((Boolean) AccessController
127:                        .doPrivileged(new PrivilegedAction() {
128:                            public Object run() {
129:                                return f.exists() ? Boolean.TRUE
130:                                        : Boolean.FALSE;
131:                            }
132:                        })).booleanValue();
133:            }
134:
135:            static long getLastModified(final File f) {
136:                return ((Long) AccessController
137:                        .doPrivileged(new PrivilegedAction() {
138:                            public Object run() {
139:                                return new Long(f.lastModified());
140:                            }
141:                        })).longValue();
142:            }
143:
144:            private SecuritySupport() {
145:            }
146:        }
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