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/**
 * 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.tika.utils;

/**
 * Copied from commons-lang to avoid requiring the dependency
 */
public class SystemUtils {

    private static final String OS_NAME_WINDOWS_PREFIX = "Windows";
    public static final String OS_NAME = getSystemProperty("os.name");
    public static final String OS_VERSION = getSystemProperty("os.version");
    public static final boolean IS_OS_AIX = getOSMatchesName("AIX");
    public static final boolean IS_OS_HP_UX = getOSMatchesName("HP-UX");
    public static final boolean IS_OS_IRIX = getOSMatchesName("Irix");
    public static final boolean IS_OS_LINUX = getOSMatchesName("Linux") || getOSMatchesName("LINUX");
    public static final boolean IS_OS_MAC = getOSMatchesName("Mac");
    public static final boolean IS_OS_MAC_OSX = getOSMatchesName("Mac OS X");
    public static final boolean IS_OS_OS2 = getOSMatchesName("OS/2");
    public static final boolean IS_OS_SOLARIS = getOSMatchesName("Solaris");
    public static final boolean IS_OS_SUN_OS = getOSMatchesName("SunOS");
    public static final boolean IS_OS_UNIX;
    public static final boolean IS_OS_WINDOWS;


    private static String getSystemProperty(String property) {
        try {
            return System.getProperty(property);
        } catch (SecurityException var2) {
            return null;
        }
    }

    private static boolean getOSMatchesName(String osNamePrefix) {
        return isOSNameMatch(OS_NAME, osNamePrefix);
    }

    static boolean isOSNameMatch(String osName, String osNamePrefix) {
        return osName == null ? false : osName.startsWith(osNamePrefix);
    }

    static {
        IS_OS_UNIX = IS_OS_AIX || IS_OS_HP_UX || IS_OS_IRIX || IS_OS_LINUX || IS_OS_MAC_OSX || IS_OS_SOLARIS || IS_OS_SUN_OS;
        IS_OS_WINDOWS = getOSMatchesName(OS_NAME_WINDOWS_PREFIX);
    }

}