/*

 * Copyright (c) 2005, 2015, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package javax.xml.xpath;

import java.net.URL;

import java.security.*;

import java.io.*;

/**

 * This class is duplicated for each JAXP subpackage so keep it in sync.

 * It is package private and therefore is not exposed as part of the JAXP

 * API.

 *

 * Security related methods that only work on J2SE 1.2 and newer.

 */

class SecuritySupport  {

    ClassLoader getContextClassLoader() {

        return AccessController.doPrivileged(new PrivilegedAction<>() {

            @Override

            public ClassLoader run() {

                ClassLoader cl = null;

                try {

                    cl = Thread.currentThread().getContextClassLoader();

                } catch (SecurityException ex) { }

                return cl;

            }

        });

    }

    String getSystemProperty(final String propName) {

        return AccessController.doPrivileged(new PrivilegedAction<>() {

            @Override

            public String run() {

                return System.getProperty(propName);

            }

        });

    }

    FileInputStream getFileInputStream(final File file)

        throws FileNotFoundException

    {

        try {

            return AccessController.doPrivileged(

                new PrivilegedExceptionAction<>() {

                    @Override

                    public FileInputStream run() throws FileNotFoundException {

                        return new FileInputStream(file);

                    }

                });

        } catch (PrivilegedActionException e) {

            throw (FileNotFoundException)e.getException();

        }

    }

    // Used for debugging purposes

    String getClassSource(Class<?> cls) {

        return AccessController.doPrivileged(new PrivilegedAction<>() {

            @Override

            public String run() {

                CodeSource cs = cls.getProtectionDomain().getCodeSource();

                if (cs != null) {

                   URL loc = cs.getLocation();

                   return loc != null ? loc.toString() : "(no location)";

                } else {

                   return "(no code source)";

                }

            }

        });

    }

    boolean doesFileExist(final File f) {

        return AccessController.doPrivileged(new PrivilegedAction<>() {

            @Override

            public Boolean run() {

                return f.exists();

            }

        });

    }

}