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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 java.util.ArrayList;
import ndr.NetworkDataRepresentation;

/**
 * Represents array of network address and security bindings.
 *
 * @exclude
 * @since 1.0
 */
final class JIDualStringArray implements Serializable {

    private static final long serialVersionUID = -3351948896808028565L;

    private JIDualStringArray() {
    }

    //static boolean test = false;
    //Will get called from Oxid Resolver
    JIDualStringArray(int port) {
        //create bindings here.
        stringBinding = new JIStringBinding[2]; //only 1
        stringBinding[0] = new JIStringBinding(port, false);

        length = stringBinding[0].getLength();

        stringBinding[1] = new JIStringBinding(port, true);

        length = length + stringBinding[1].getLength() + 2; //null termination

        secOffset = length;

        securityBinding = new JISecurityBinding[1]; //support only winnt NTLM
        securityBinding[0] = new JISecurityBinding(0x0a, 0xffff, "");
        length += securityBinding[0].getLength();

        length = length + 2 + 2 + 2; //null termination, 2 bytes for num entries and 2 bytes for sec offset.
    }

    private JIStringBinding[] stringBinding = null;
    private JISecurityBinding[] securityBinding = null;
    private int length = 0;
    private int secOffset = 0;

    static JIDualStringArray decode(NetworkDataRepresentation ndr) {
        JIDualStringArray dualStringArray = new JIDualStringArray();

        //first extract number of entries
        int numEntries = ndr.readUnsignedShort();

        //return empty
        if (numEntries == 0) {
            return dualStringArray;
        }

        //extract security offset
        int securityOffset = ndr.readUnsignedShort();

        ArrayList listOfStringBindings = new ArrayList();
        ArrayList listOfSecurityBindings = new ArrayList();

        boolean stringbinding = true;
        while (true) {
            if (stringbinding) {
                JIStringBinding s = JIStringBinding.decode(ndr);
                if (s == null) {
                    stringbinding = false;
                    //null termination
                    dualStringArray.length += 2;
                    dualStringArray.secOffset = dualStringArray.length;
                    continue;
                }

                listOfStringBindings.add(s);
                dualStringArray.length += s.getLength();
            } else {
                JISecurityBinding s = JISecurityBinding.decode(ndr);
                if (s == null) {
                    //null termination
                    dualStringArray.length += 2;
                    break;
                }

                listOfSecurityBindings.add(s);
                dualStringArray.length += s.getLength();
            }

        }

        // 2 bytes for num entries and 2 bytes for sec offset.
        dualStringArray.length = dualStringArray.length + 2 + 2;

        dualStringArray.stringBinding = (JIStringBinding[]) listOfStringBindings.toArray(new JIStringBinding[listOfStringBindings.size()]);
        dualStringArray.securityBinding = (JISecurityBinding[]) listOfSecurityBindings.toArray(new JISecurityBinding[listOfSecurityBindings.size()]);
        return dualStringArray;
    }

    public JIStringBinding[] getStringBindings() {
        return stringBinding;
    }

    public JISecurityBinding[] getSecurityBindings() {
        return securityBinding;
    }

    public int getLength() {
        return length;
    }

    public void encode(NetworkDataRepresentation ndr) {
        //fill num entries
        //this is total length/2. since they are all shorts
        ndr.writeUnsignedShort((length - 4) / 2);
        ndr.writeUnsignedShort((secOffset) / 2);

        int i = 0;
        if (stringBinding != null) {
            while (i < stringBinding.length) {
                stringBinding[i].encode(ndr);
                i++;
            }
            ndr.writeUnsignedShort(0);
        }

        i = 0;

        if (securityBinding != null) {
            while (i < securityBinding.length) {
                securityBinding[i].encode(ndr);
                i++;
            }
            ndr.writeUnsignedShort(0);
        }

    }

}