NetworkTopologyDiscoveryImpl.java
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00001 
00004 package javax.jmdns.impl;
00005 
00006 import java.lang.reflect.Method;
00007 import java.net.InetAddress;
00008 import java.net.NetworkInterface;
00009 import java.net.SocketException;
00010 import java.util.Enumeration;
00011 import java.util.HashSet;
00012 import java.util.Set;
00013 import java.util.logging.Level;
00014 import java.util.logging.Logger;
00015 
00016 import javax.jmdns.NetworkTopologyDiscovery;
00017 
00023 public class NetworkTopologyDiscoveryImpl implements NetworkTopologyDiscovery {
00024     private final static Logger logger = Logger.getLogger(NetworkTopologyDiscoveryImpl.class.getName());
00025 
00026     private final Method        _isUp;
00027 
00028     private final Method        _supportsMulticast;
00029 
00033     public NetworkTopologyDiscoveryImpl() {
00034         super();
00035         Method isUp;
00036         try {
00037             isUp = NetworkInterface.class.getMethod("isUp", (Class<?>[]) null);
00038         } catch (Exception exception) {
00039             // We do not want to throw anything if the method does not exist.
00040             isUp = null;
00041         }
00042         _isUp = isUp;
00043         Method supportsMulticast;
00044         try {
00045             supportsMulticast = NetworkInterface.class.getMethod("supportsMulticast", (Class<?>[]) null);
00046         } catch (Exception exception) {
00047             // We do not want to throw anything if the method does not exist.
00048             supportsMulticast = null;
00049         }
00050         _supportsMulticast = supportsMulticast;
00051     }
00052 
00053     /*
00054      * (non-Javadoc)
00055      * @see javax.jmdns.JmmDNS.NetworkTopologyDiscovery#getInetAddresses()
00056      */
00057     @Override
00058     public InetAddress[] getInetAddresses() {
00059         Set<InetAddress> result = new HashSet<InetAddress>();
00060         try {
00061 
00062             for (Enumeration<NetworkInterface> nifs = NetworkInterface.getNetworkInterfaces(); nifs.hasMoreElements();) {
00063                 NetworkInterface nif = nifs.nextElement();
00064                 for (Enumeration<InetAddress> iaenum = nif.getInetAddresses(); iaenum.hasMoreElements();) {
00065                     InetAddress interfaceAddress = iaenum.nextElement();
00066                     if (logger.isLoggable(Level.FINEST)) {
00067                         logger.finest("Found NetworkInterface/InetAddress: " + nif + " -- " + interfaceAddress);
00068                     }
00069                     if (this.useInetAddress(nif, interfaceAddress)) {
00070                         result.add(interfaceAddress);
00071                     }
00072                 }
00073             }
00074         } catch (SocketException se) {
00075             logger.warning("Error while fetching network interfaces addresses: " + se);
00076         }
00077         return result.toArray(new InetAddress[result.size()]);
00078     }
00079 
00080     /*
00081      * (non-Javadoc)
00082      * @see javax.jmdns.JmmDNS.NetworkTopologyDiscovery#useInetAddress(java.net.NetworkInterface, java.net.InetAddress)
00083      */
00084     @Override
00085     public boolean useInetAddress(NetworkInterface networkInterface, InetAddress interfaceAddress) {
00086         try {
00087             if (_isUp != null) {
00088                 try {
00089                     if (!((Boolean) _isUp.invoke(networkInterface, (Object[]) null)).booleanValue()) {
00090                         return false;
00091                     }
00092                 } catch (Exception exception) {
00093                     // We should hide that exception.
00094                 }
00095             }
00096             if (_supportsMulticast != null) {
00097                 try {
00098                     if (!((Boolean) _supportsMulticast.invoke(networkInterface, (Object[]) null)).booleanValue()) {
00099                         return false;
00100                     }
00101                 } catch (Exception exception) {
00102                     // We should hide that exception.
00103                 }
00104             }
00105             if (interfaceAddress.isLoopbackAddress()) {
00106                 return false;
00107             }
00108             return true;
00109         } catch (Exception exception) {
00110             return false;
00111         }
00112     }
00113 
00114     /*
00115      * (non-Javadoc)
00116      * @see javax.jmdns.NetworkTopologyDiscovery#lockInetAddress(java.net.InetAddress)
00117      */
00118     @Override
00119     public void lockInetAddress(InetAddress interfaceAddress) {
00120         // Default implementation does nothing.
00121     }
00122 
00123     /*
00124      * (non-Javadoc)
00125      * @see javax.jmdns.NetworkTopologyDiscovery#unlockInetAddress(java.net.InetAddress)
00126      */
00127     @Override
00128     public void unlockInetAddress(InetAddress interfaceAddress) {
00129         // Default implementation does nothing.
00130     }
00131 
00132 }
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zeroconf_jmdns
Author(s): Daniel Stonier
autogenerated on Tue Nov 6 2012 14:18:57