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Common code shared by multiple Tomcat components

There is a newer version: 11.0.1

/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package org.apache.tomcat.util.compat;

import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.Locale;

public class JrePlatform {

    private static final String OS_NAME_PROPERTY = "os.name";

    static {
        /*
         * There are a few places where a) the behaviour of the Java API depends
         * on the underlying platform and b) those behavioural differences have
         * an impact on Tomcat.
         *
         * Tomcat therefore needs to be able to determine the platform it is
         * running on to account for those differences.
         *
         * In an ideal world this code would not exist.
         */

        // This check is derived from the check in Apache Commons Lang
        String osName;
        if (System.getSecurityManager() == null) {
            osName = System.getProperty(OS_NAME_PROPERTY);
        } else {
            osName = AccessController.doPrivileged(
                    (PrivilegedAction) () -> System.getProperty(OS_NAME_PROPERTY));
        }

        IS_MAC_OS = osName.toLowerCase(Locale.ENGLISH).startsWith("mac os x");

        IS_WINDOWS = osName.startsWith("Windows");
    }


    public static final boolean IS_MAC_OS;

    public static final boolean IS_WINDOWS;
}