Java example source code file (ICUData.java)

This example Java source code file (ICUData.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

class, icudata, inputstream, missingresourceexception, net, network, privilegedaction, security, string, util

The ICUData.java Java example source code

/*
 * 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);
    }
}