/*

 * Copyright (c) 2002, 2012, 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.activation;

import java.security.*;

import java.net.*;

import java.io.*;

import java.util.*;

/**

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

 *

 * @since 1.6

 */

class SecuritySupport {

    private SecuritySupport() {

        // private constructor, can't create an instance

    }

    public static ClassLoader getContextClassLoader() {

        return (ClassLoader)

                AccessController.doPrivileged(new PrivilegedAction() {

            public Object run() {

                ClassLoader cl = null;

                try {

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

                } catch (SecurityException ex) { }

                return cl;

            }

        });

    }

    public static InputStream getResourceAsStream(final Class c,

                                final String name) throws IOException {

        try {

            return (InputStream)

                AccessController.doPrivileged(new PrivilegedExceptionAction() {

                    public Object run() throws IOException {

                        return c.getResourceAsStream(name);

                    }

                });

        } catch (PrivilegedActionException e) {

            throw (IOException)e.getException();

        }

    }

    public static URL[] getResources(final ClassLoader cl, final String name) {

        return (URL[])

                AccessController.doPrivileged(new PrivilegedAction() {

            public Object run() {

                URL[] ret = null;

                try {

                    List v = new ArrayList();

                    Enumeration e = cl.getResources(name);

                    while (e != null && e.hasMoreElements()) {

                        URL url = (URL)e.nextElement();

                        if (url != null)

                            v.add(url);

                    }

                    if (v.size() > 0) {

                        ret = new URL[v.size()];

                        ret = (URL[])v.toArray(ret);

                    }

                } catch (IOException ioex) {

                } catch (SecurityException ex) { }

                return ret;

            }

        });

    }

    public static URL[] getSystemResources(final String name) {

        return (URL[])

                AccessController.doPrivileged(new PrivilegedAction() {

            public Object run() {

                URL[] ret = null;

                try {

                    List v = new ArrayList();

                    Enumeration e = ClassLoader.getSystemResources(name);

                    while (e != null && e.hasMoreElements()) {

                        URL url = (URL)e.nextElement();

                        if (url != null)

                            v.add(url);

                    }

                    if (v.size() > 0) {

                        ret = new URL[v.size()];

                        ret = (URL[])v.toArray(ret);

                    }

                } catch (IOException ioex) {

                } catch (SecurityException ex) { }

                return ret;

            }

        });

    }

    public static InputStream openStream(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();

        }

    }

}