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Pure Java implementation of libzmq

There is a newer version: 0.6.0

package zmq;

import java.net.Inet6Address;
import java.net.InetSocketAddress;
import java.net.SocketAddress;

public class Address
{
    public interface IZAddress
    {
        String toString();
        void resolve(String name, boolean ip4only);
        SocketAddress address();
    };

    private final String protocol;
    private final String address;
    private final boolean ipv4only;

    private IZAddress resolved;

    public Address(final String protocol, final String address, final boolean ipv4only)
    {
        this.protocol = protocol;
        this.address = address;
        this.ipv4only = ipv4only;
        resolved = null;
    }

    public Address(SocketAddress socketAddress)
    {
        InetSocketAddress sockAddr = (InetSocketAddress) socketAddress;
        this.address = sockAddr.getAddress().getHostAddress() + ":" + sockAddr.getPort();
        protocol = "tcp";
        resolved = null;
        ipv4only = !(sockAddr.getAddress() instanceof Inet6Address);
    }

    @Override
    public String toString()
    {
        if (protocol.equals("tcp") && isResolved()) {
            return resolved.toString();
        }
        else if (protocol.equals("ipc") && isResolved()) {
            return resolved.toString();
        }
        else if (!protocol.isEmpty() && !address.isEmpty()) {
            return protocol + "://" + address;
        }
        else {
            return "";
        }
    }

    public String protocol()
    {
        return protocol;
    }

    public String address()
    {
        return address;
    }

    public IZAddress resolved()
    {
        return resolved;
    }

    public boolean isResolved()
    {
        return resolved != null;
    }

    public boolean resolve()
    {
       if (protocol.equals("tcp")) {
            resolved = new TcpAddress();
            resolved.resolve(address, ipv4only);
            return true;
        }
        else if (protocol.equals("ipc")) {
            resolved = new IpcAddress();
            resolved.resolve(address, true);
            return true;
        }
        else {
            return false;
        }
    }
}