EnvUtil.java

/**
 * Logback: the reliable, generic, fast and flexible logging framework.
 * Copyright (C) 1999-2013, QOS.ch. All rights reserved.
 *
 * This program and the accompanying materials are dual-licensed under
 * either the terms of the Eclipse Public License v1.0 as published by
 * the Eclipse Foundation
 *
 *   or (per the licensee's choosing)
 *
 * under the terms of the GNU Lesser General Public License version 2.1
 * as published by the Free Software Foundation.
 */
package ch.qos.logback.core.util;

import java.util.ArrayList;
import java.util.List;

/**
 * @author Ceki Gücü
 */
public class EnvUtil {

  /**
   * Heuristically determines whether the current OS is Android
   */
  static public boolean isAndroidOS() {
    String osname = OptionHelper.getSystemProperty("os.name");
    String root = OptionHelper.getEnv("ANDROID_ROOT");
    String data = OptionHelper.getEnv("ANDROID_DATA");

    return osname != null && osname.contains("Linux") &&
        root != null && root.contains("/system") &&
        data != null && data.contains("/data");
  }

  static private boolean isJDK_N_OrHigher(int n) {
    List<String> versionList = new ArrayList<String>();
    // this code should work at least until JDK 10 (assuming n parameter is
    // always 6 or more)
    for (int i = 0; i < 5; i++) {
      versionList.add("1." + (n + i));
    }

    String javaVersion = System.getProperty("java.version");
    if (javaVersion == null) {
      return false;
    }
    for (String v : versionList) {
      if (javaVersion.startsWith(v))
        return true;
    }
    return false;
  }

  static public boolean isJDK5() {
    return isJDK_N_OrHigher(5);
  }

  static public boolean isJDK6OrHigher() {
    return isJDK_N_OrHigher(6);
  }

  static public boolean isJDK7OrHigher() {
    return isJDK_N_OrHigher(7);
  }

  static public boolean isWindows() {
    String os = System.getProperty("os.name");
    return os.startsWith("Windows");
  }
}