/*

 * Copyright (c) 2005, 2011, 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.

 */

/*

 *******************************************************************************

 * (C) Copyright IBM Corp. 1996-2005 - All Rights Reserved                     *

 *                                                                             *

 * The original version of this source code and documentation is copyrighted   *

 * and owned by IBM, These materials are provided under terms of a License     *

 * Agreement between IBM and Sun. This technology is protected by multiple     *

 * US and International patents. This notice and attribution to IBM may not    *

 * to removed.                                                                 *

 *******************************************************************************

 */

package sun.text.normalizer;

import java.io.InputStream;

import java.net.URL;

import java.security.AccessController;

import java.security.PrivilegedAction;

import java.util.MissingResourceException;

/**

 * Provides access to ICU data files as InputStreams.  Implements security checking.

 */

public final class ICUData {

    private static InputStream getStream(final Class<ICUData> root, final String resourceName, boolean required) {

        InputStream i = null;

        if (System.getSecurityManager() != null) {

            i = AccessController.doPrivileged(new PrivilegedAction<InputStream>() {

                    public InputStream run() {

                        return root.getResourceAsStream(resourceName);

                    }

                });

        } else {

            i = root.getResourceAsStream(resourceName);

        }

        if (i == null && required) {

            throw new MissingResourceException("could not locate data", root.getPackage().getName(), resourceName);

        }

        return i;

    }

    /*

     * Convenience override that calls getStream(ICUData.class, resourceName, false);

     */

    public static InputStream getStream(String resourceName) {

        return getStream(ICUData.class, resourceName, false);

    }

    /*

     * Convenience method that calls getStream(ICUData.class, resourceName, true).

     */

    public static InputStream getRequiredStream(String resourceName) {

        return getStream(ICUData.class, resourceName, true);

    }

}