JDK14/Java14源码在线阅读

/*
 * Copyright (c) 2010, 2015, 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 jdk.nashorn.internal.runtime;

import java.util.MissingResourceException;
import java.util.ResourceBundle;

/**
 * Class to handle version strings for Nashorn.
 */
public final class Version {
    // Don't create me!
    private Version() {
    }

    /**
     * The current version number as a string.
     * @return version string
     */
    public static String version() {
        return version("version_short");  // E.g. "9-internal" or "9.1.2"
    }

    /**
     * The current full version number as a string.
     * @return full version string
     */
    public static String fullVersion() {
        return version("version_string"); // E.g. "9.1.2.3-ea-4+nashorn-testing"
    }

    private static final String   VERSION_RB_NAME = "jdk.nashorn.internal.runtime.resources.version";
    private static ResourceBundle versionRB;

    private static String version(final String key) {
        if (versionRB == null) {
            try {
                versionRB = ResourceBundle.getBundle(VERSION_RB_NAME);
            } catch (final MissingResourceException e) {

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