/*
 * 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.
/**
 * 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();
            }
        });
    }

}