/*
 * Copyright (c) 2008, 2021, 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
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 */

package sun.font;

/**
 * Factory class used to retrieve a valid FontManager instance for the current
 * platform.
 *
 * A default implementation is given for Linux, Mac OS and Windows.
 */
public final class FontManagerFactory {

    /** Our singleton instance. */
    private static volatile FontManager instance;

    /**
     * Get a valid FontManager implementation for the current platform.
     *
     * @return a valid FontManager instance for the current platform
     */
    public static FontManager getInstance() {

        FontManager result = instance;
        if (result == null) {
            synchronized (FontManagerFactory.class) {
                result = instance;
                if (result == null) {
                    instance = result = PlatformFontInfo.createFontManager();
                }
            }
        }
        return result;
    }
}