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This bundle wraps Pi4j (http://pi4j.com) that wraps the native code Wiring Pi (http://wiringpi.com). It wraps these libraries to make them OSGi friendly and allow them to work together with the OSGi enRoute IoT circuit library (osgi.enroute.iot.circuit). The bundle will first use Pi4J to detect on what hardware it runs. If it runs on an appropriate type, it will register a component that can be configured with Metatype. The Metatype defines a full blown configuration template for all the Pi's functions. The GPIO's are registered as components for the circuit. Regardless of the success of the configuration, this bundle will also register a GpioController service, which is the main Pi4J class.

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package com.pi4j.system;

/*
 * #%L
 * **********************************************************************
 * ORGANIZATION  :  Pi4J
 * PROJECT       :  Pi4J :: Java Library (Core)
 * FILENAME      :  NetworkInfo.java  
 * 
 * This file is part of the Pi4J project. More information about 
 * this project can be found here:  http://www.pi4j.com/
 * **********************************************************************
 * %%
 * Copyright (C) 2012 - 2015 Pi4J
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 * 
 * This program 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 Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU General Lesser Public
 * License along with this program.  If not, see
 * .
 * #L%
 */


import com.pi4j.util.ExecUtil;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

public class NetworkInfo  {

    // private constructor 
    private NetworkInfo() {
        // forbid object construction 
    }
    
    public static String getHostname() throws IOException, InterruptedException {
        return ExecUtil.execute("hostname --short")[0];
    }

    public static String getFQDN() throws IOException, InterruptedException {
        return ExecUtil.execute("hostname --fqdn")[0];
    }

    public static String[] getIPAddresses() throws IOException, InterruptedException {
        return ExecUtil.execute("hostname --all-ip-addresses", " ");
    }

    public static String getIPAddress() throws IOException, InterruptedException {
        return ExecUtil.execute("hostname -i")[0];
    }

    public static String[] getFQDNs() throws IOException, InterruptedException {
        return ExecUtil.execute("hostname --all-fqdns", " ");
    }

    public static String[] getNameservers() throws IOException, InterruptedException {
        String[] nameservers = ExecUtil.execute("cat /etc/resolv.conf");
        List result = new ArrayList<>();
        for (String nameserver : nameservers) {
            if (nameserver.startsWith("nameserver")) {
                result.add(nameserver.substring(11).trim());
            }
        }
        return result.toArray(new String[result.size()]);
    }
    
//    public static Map getNetworkInterfaces() throws IOException, InterruptedException {
//
//        Map interfaces = new HashMap();
//
//        List result = new ArrayList();
//        Process p = Runtime.getRuntime().exec("ifconfig");
//        p.waitFor();
//        BufferedReader reader = new BufferedReader(new InputStreamReader(p.getInputStream()));
//        String line = reader.readLine();
//        String key = null;
//        while (line != null) {
//        
//            if (!line.isEmpty()) {
//            
//                // if the line does start with string data and not spaces, then 
//                // it is a new interface record
//                if (!line.startsWith("  ")) {
//                
//                    String[] parts = line.split(" ", 2);
//                    key = parts[0].trim();
//                    //interfaces.put(key, value);
//                }
//
//                if (key != null && !key.isEmpty()) {
//                
//                    String[] properties = line.split("  ");
//                    for (String property : properties) {
//                        String[] propparts = property.split(":",2);
//                        
//                    }
//                }
//                
////                if (split != null || split.isEmpty()) {
////                    result.add(line.trim());
////                    System.out.println(line.trim());
////                } else {
////                    String[] parts = line.trim().split(split);
////                    for (String part : parts) {
////                        if (part != null && !part.isEmpty()) {
////                            result.add(part.trim());
////                            System.out.println(part.trim());
////                        }
////                    }
////                }
//            }
//            line = reader.readLine();
//        }
//
//
//        
//        //throw new RuntimeException("Invalid command: " + command);
//        
//        return interfaces;
//    }

}