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/** j-Interop (Pure Java implementation of DCOM protocol)
 * Copyright (C) 2006  Vikram Roopchand
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3.0 of the License, or (at your option) any later version.
 *
 * Though a sincere effort has been made to deliver a professional,
 * quality product,the library itself is distributed WITHOUT ANY WARRANTY;
 * See the GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
 */
package org.jinterop.dcom.core;

import java.io.Serializable;
import ndr.NetworkDataRepresentation;

final class JIStringBinding implements Serializable {

    private static final long serialVersionUID = -5797400235890434880L;

    private JIStringBinding() {
    }

    private int towerId = -1;

    //IP or resolved name follwed by port in []
    private String networkAddress = null;

    private int length = -1;

    public int getLength() {
        return length;
    }

    //private static boolean test = false;
    JIStringBinding(int port, boolean hostname) {
        String hostaddress = null;
        if (!hostname) {
            //single binding with our IP address
            hostaddress = JISession.getLocalhostAddressAsIPString();
        } else {
            hostaddress = JISession.getLocalhostCanonicalAddressAsString();
        }

        if (port == -1) {
            networkAddress = hostaddress;
        } else {
            networkAddress = hostaddress + "[" + Integer.toString(port) + "]";
        }

        length = 2 + networkAddress.length() * 2 + 2;
        towerId = 0x7; //TCP_IP
    }

    JIStringBinding(int port) {
        this(port, false);
    }

    static JIStringBinding decode(NetworkDataRepresentation ndr) {
        JIStringBinding stringBinding = new JIStringBinding();

        stringBinding.towerId = ndr.readUnsignedShort();

        //hit the end , security bindings start.
        if (stringBinding.towerId == 0) {
            return null;
        }

        //now to read the String till a null termination character.
        // a '0' will be represented as 30
        int retVal = -1;
        StringBuilder buffer = new StringBuilder();
        while ((retVal = ndr.readUnsignedShort()) != 0) {
            //even though this is a unicode string , but will not have anything else
            //other than ascii charset, which is supported by all encodings.
            buffer.append(new String(new byte[]{(byte) retVal}));
        }

        stringBinding.networkAddress = buffer.toString();

        // 2 bytes for tower id, each character is 2 bytes (short) and last 2 bytes for null termination
        stringBinding.length = 2 + stringBinding.networkAddress.length() * 2 + 2;

        return stringBinding;
    }

    public int getTowerId() {
        return towerId;
    }

    public String getNetworkAddress() {
        return networkAddress;
    }

    public void encode(NetworkDataRepresentation ndr) {
        ndr.writeUnsignedShort(towerId);

        //now to write the network address.
        int i = 0;
        while (i < networkAddress.length()) {
            ndr.writeUnsignedShort(networkAddress.charAt(i));
            i++;
        }

//		//TODO testing only.
//		if (networkAddress.length()%2 != 0)
//		{
//			ndr.writeUnsignedShort(0);
//		}
        ndr.writeUnsignedShort(0); //null termination

    }

}