/**
    * Oshi (https://github.com/dblock/oshi)
    * 
    * Copyright (c) 2010 - 2015 The Oshi Project Team
    * 
    * All rights reserved. This program and the accompanying materials
    * are made available under the terms of the Eclipse Public License v1.0
    * which accompanies this distribution, and is available at
    * http://www.eclipse.org/legal/epl-v10.html
   * 
   * Contributors:
   * dblock[at]dblock[dot]org
   * alessandro[at]perucchi[dot]org
   * widdis[at]gmail[dot]com
   * https://github.com/dblock/oshi/graphs/contributors
   */
  package oshi.software.os.linux;
  
  import java.io.FileNotFoundException;
  import java.io.FileReader;
  import java.util.Scanner;
  
  import oshi.software.os.OperatingSystem;
  import oshi.software.os.OperatingSystemVersion;
  import oshi.software.os.linux.proc.OSVersionInfoEx;
  
  /**
   * Linux is a family of free operating systems most commonly used on personal
   * computers.
   *
   * @author alessandro[at]perucchi[dot]org
   */
  public class LinuxOperatingSystem implements OperatingSystem {
  
  	private OperatingSystemVersion _version = null;
  	private String _family = null;
  
  	@Override
  	public String getFamily() {
  		if (this._family == null) {
  			try (final Scanner in = new Scanner(new FileReader("/etc/os-release"))) {
  				in.useDelimiter("\n");
  				while (in.hasNext()) {
  					String[] splittedLine = in.next().split("=");
  					if (splittedLine[0].equals("NAME")) {
  						// remove beginning and ending '"' characters, etc from
  						// NAME="Ubuntu"
  						this._family = splittedLine[1].replaceAll("^\"|\"$", "");
  						break;
  					}
  				}
  			} catch (FileNotFoundException e) {
  				return "";
  			}
  		}
  		return this._family;
  	}
  
  	@Override
  	public String getManufacturer() {
  		return "GNU/Linux";
  	}
  
  	@Override
  	public OperatingSystemVersion getVersion() {
  		if (this._version == null) {
  			this._version = new OSVersionInfoEx();
  		}
  		return this._version;
  	}
  
  	@Override
  	public String toString() {
  		StringBuilder sb = new StringBuilder();
  		sb.append(getManufacturer());
  		sb.append(" ");
  		sb.append(getFamily());
  		sb.append(" ");
  		sb.append(getVersion().toString());
  		return sb.toString();
  	}
  }