/*
* Mojito Distributed Hash Table (Mojito DHT)
* Copyright (C) 2006-2007 LimeWire LLC
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 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 Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
package org.limewire.mojito.util;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import org.limewire.collection.IntHashMap;
import org.limewire.io.NetworkUtils;
import org.limewire.mojito.routing.Contact;
import org.limewire.mojito.settings.KademliaSettings;
/**
* The SameClassFilter filters all Contacts that have the same
* Class C Network IP Address.
*/
public class SameClassFilter {
private final IntHashMap<Contact> filter;
public SameClassFilter(Contact sender) {
this(sender, KademliaSettings.REPLICATION_PARAMETER.getValue());
}
public SameClassFilter(Contact sender, int initalSize) {
this.filter = new IntHashMap<Contact>(initalSize);
add(sender);
}
private boolean add(Contact node) {
InetAddress addr = ((InetSocketAddress)node.getContactAddress()).getAddress();
return filter.put(NetworkUtils.getClassC(addr), node) == null;
}
/**
* Returns true if the given Contact is from the
* same Class C Network as the sender or an another
* Contact.
*/
public boolean isSameNetwork(Contact node) {
return !add(node);
}
}