/*

 * Copyright (c) 2005, 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.net.*;

import java.io.*;

import java.util.*;

/**

 * 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 (ClassLoader)

                AccessController.doPrivileged(new PrivilegedAction() {

            public Object run() {

                ClassLoader cl = null;

                try {

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

                } catch (SecurityException ex) { }

                return cl;

            }

        });

    }

    String getSystemProperty(final String propName) {

        return (String)

            AccessController.doPrivileged(new PrivilegedAction() {

                public Object run() {

                    return System.getProperty(propName);

                }

            });

    }

    FileInputStream getFileInputStream(final File file)

        throws FileNotFoundException

    {

        try {

            return (FileInputStream)

                AccessController.doPrivileged(new PrivilegedExceptionAction() {

                    public Object run() throws FileNotFoundException {

                        return new FileInputStream(file);

                    }

                });

        } catch (PrivilegedActionException e) {

            throw (FileNotFoundException)e.getException();

        }

    }

    InputStream getURLInputStream(final URL url)

        throws IOException

    {

        try {

            return (InputStream)

                AccessController.doPrivileged(new PrivilegedExceptionAction() {

                    public Object run() throws IOException {

                        return url.openStream();

                    }

                });

        } catch (PrivilegedActionException e) {

            throw (IOException)e.getException();

        }

    }

    URL getResourceAsURL(final ClassLoader cl,

                                           final String name)

    {

        return (URL)

            AccessController.doPrivileged(new PrivilegedAction() {

                public Object run() {

                    URL url;

                    if (cl == null) {

                        url = Object.class.getResource(name);

                    } else {

                        url = cl.getResource(name);

                    }

                    return url;

                }

            });

    }

    Enumeration getResources(final ClassLoader cl,

                                           final String name) throws IOException

    {

        try{

        return (Enumeration)

            AccessController.doPrivileged(new PrivilegedExceptionAction() {

                public Object run() throws IOException{

                    Enumeration enumeration;

                    if (cl == null) {

                        enumeration = ClassLoader.getSystemResources(name);

                    } else {

                        enumeration = cl.getResources(name);

                    }

                    return enumeration;

                }

            });

        }catch(PrivilegedActionException e){

            throw (IOException)e.getException();

        }

    }

    InputStream getResourceAsStream(final ClassLoader cl,

                                           final String name)

    {

        return (InputStream)

            AccessController.doPrivileged(new PrivilegedAction() {

                public Object run() {

                    InputStream ris;

                    if (cl == null) {

                        ris = Object.class.getResourceAsStream(name);

                    } else {

                        ris = cl.getResourceAsStream(name);

                    }

                    return ris;

                }

            });

    }

    boolean doesFileExist(final File f) {

    return ((Boolean)

            AccessController.doPrivileged(new PrivilegedAction() {

                public Object run() {

                    return new Boolean(f.exists());

                }

            })).booleanValue();

    }

}