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/**
*
*/
package javax.jmdns.impl;
import java.lang.reflect.Method;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.jmdns.NetworkTopologyDiscovery;
/**
* This class implements NetworkTopologyDiscovery.
*
* @author Pierre Frisch
*/
public class NetworkTopologyDiscoveryImpl implements NetworkTopologyDiscovery {
private final static Logger logger = Logger.getLogger(NetworkTopologyDiscoveryImpl.class.getName());
private final Method _isUp;
private final Method _supportsMulticast;
/**
*
*/
public NetworkTopologyDiscoveryImpl() {
super();
Method isUp;
try {
isUp = NetworkInterface.class.getMethod("isUp", (Class<?>[]) null);
} catch (Exception exception) {
// We do not want to throw anything if the method does not exist.
isUp = null;
}
_isUp = isUp;
Method supportsMulticast;
try {
supportsMulticast = NetworkInterface.class.getMethod("supportsMulticast", (Class<?>[]) null);
} catch (Exception exception) {
// We do not want to throw anything if the method does not exist.
supportsMulticast = null;
}
_supportsMulticast = supportsMulticast;
}
/*
* (non-Javadoc)
* @see javax.jmdns.JmmDNS.NetworkTopologyDiscovery#getInetAddresses()
*/
@Override
public InetAddress[] getInetAddresses() {
Set<InetAddress> result = new HashSet<InetAddress>();
try {
for (Enumeration<NetworkInterface> nifs = NetworkInterface.getNetworkInterfaces(); nifs.hasMoreElements();) {
NetworkInterface nif = nifs.nextElement();
for (Enumeration<InetAddress> iaenum = nif.getInetAddresses(); iaenum.hasMoreElements();) {
InetAddress interfaceAddress = iaenum.nextElement();
if (logger.isLoggable(Level.FINEST)) {
logger.finest("Found NetworkInterface/InetAddress: " + nif + " -- " + interfaceAddress);
}
if (this.useInetAddress(nif, interfaceAddress)) {
result.add(interfaceAddress);
}
}
}
} catch (SocketException se) {
logger.warning("Error while fetching network interfaces addresses: " + se);
}
return result.toArray(new InetAddress[result.size()]);
}
/*
* (non-Javadoc)
* @see javax.jmdns.JmmDNS.NetworkTopologyDiscovery#useInetAddress(java.net.NetworkInterface, java.net.InetAddress)
*/
@Override
public boolean useInetAddress(NetworkInterface networkInterface, InetAddress interfaceAddress) {
try {
if (_isUp != null) {
try {
if (!((Boolean) _isUp.invoke(networkInterface, (Object[]) null)).booleanValue()) {
return false;
}
} catch (Exception exception) {
// We should hide that exception.
}
}
if (_supportsMulticast != null) {
try {
if (!((Boolean) _supportsMulticast.invoke(networkInterface, (Object[]) null)).booleanValue()) {
return false;
}
} catch (Exception exception) {
// We should hide that exception.
}
}
if (interfaceAddress.isLoopbackAddress()) {
return false;
}
return true;
} catch (Exception exception) {
return false;
}
}
/*
* (non-Javadoc)
* @see javax.jmdns.NetworkTopologyDiscovery#lockInetAddress(java.net.InetAddress)
*/
@Override
public void lockInetAddress(InetAddress interfaceAddress) {
// Default implementation does nothing.
}
/*
* (non-Javadoc)
* @see javax.jmdns.NetworkTopologyDiscovery#unlockInetAddress(java.net.InetAddress)
*/
@Override
public void unlockInetAddress(InetAddress interfaceAddress) {
// Default implementation does nothing.
}
}
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