InetAddressAndPort.java

import java.io.Serializable;
import java.net.InetAddress;
import java.net.UnknownHostException;

public final class InetAddressAndPort implements Serializable {

    private static final long serialVersionUID = 0;
    static volatile int defaultPort = 7000;

    private final InetAddress address;
    private final int port;

    public InetAddressAndPort() throws UnknownHostException {
        this.address = InetAddress.getLocalHost();
        this.port = defaultPort;
    }

    private InetAddressAndPort(InetAddress address, int port) {
        validatePortRange(port);
        this.address = address;
        this.port = port;
    }

    public static InetAddressAndPort getByAddress(InetAddress address){
        return getByAddressOverrideDefaults(address, null);
    }

    public static InetAddressAndPort getByAddressOverrideDefaults(InetAddress address, Integer port) {
        if (port == null) {
            port = defaultPort;
        }
        return new InetAddressAndPort(address, port);
    }

    public InetAddressAndPort withPort(int port) {
        return new InetAddressAndPort(address, port);
    }

    private static void validatePortRange(int port) {
        if (port < 0 | port > 65535)
        {
            throw new IllegalArgumentException("Port " + port + " is not a valid port number in the range 0-65535");
        }
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        InetAddressAndPort that = (InetAddressAndPort) o;

        if (port != that.port) return false;
        return address.equals(that.address);
    }

    @Override
    public int hashCode(){
        int result = address.hashCode();
        result = 31 * result + port;
        return result;
    }

    public String getHostAddress(boolean withPort) {
        if (withPort)
            return toString();
        else
            return address.getHostAddress();
    }

    @Override
    public String toString()
    {
        return toString(true);
    }

    public String toString(boolean withPort) {
        if (withPort)
            return toString(address, port);
        else
            return address.toString();
    }

    public static String toString(InetAddress address, int port) {
        return address.getHostAddress() + ":" + port;
    }

    public static String getLocalHost() throws UnknownHostException {
        return InetAddress.getLocalHost().getHostAddress();
    }

    public static void initializeDefaultPort(int port) {
        defaultPort = port;
    }

    static int getDefaultPort() {
        return defaultPort;
    }

}