root/apps/blackberry/branches/1.5/blackberry/src/org/telnic/blackberry/util/listcallbacks/LookupResultsListCallback.java @ 571

/******************************************************************
Copyright (c) 2008, Telnic Ltd.

All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are
met:

*   Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer. 
*   Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. 
*   Neither the name of the Telnic Ltd. nor the names of its
contributors may be used to endorse or promote products derived from this software without specific prior written permission. 

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

*****************************************************************/

package org.telnic.blackberry.util.listcallbacks;

import java.io.UnsupportedEncodingException;
import java.util.Enumeration;
import java.util.Vector;

import net.rim.device.api.i18n.ResourceBundle;
import net.rim.device.api.system.Bitmap;
import net.rim.device.api.ui.Font;
import net.rim.device.api.ui.Graphics;
import net.rim.device.api.ui.component.ListField;
import net.rim.device.api.ui.component.ListFieldCallback;

import org.bouncycastle.util.encoders.Base64;
import org.telnic.blackberry.TelnameApp;
import org.telnic.blackberry.TelnameAppResource;
import org.telnic.blackberry.dns.DNSLocResourceRecord;
import org.telnic.blackberry.dns.DNSTelnameNaptrResourceRecord;
import org.telnic.blackberry.options.Options;
import org.telnic.blackberry.util.Logger;

/**
 * Provides drawing functionality for the list object displaying lookup results
 *
 * @author Ben Dowling, Jonathan Maycock
 * @version $Id: LookupResultsListCallback.java,v 1.12 2009/11/06 11:54:16 jm2 Exp $
 */
public class LookupResultsListCallback implements ListFieldCallback
{
    /**
     * Denotes the back item.
     */
    public static int NONE = 0;

    /**
     * Denotes the back item.
     */
    public static int BACK_ELEMENT = 1;

    /**
     *  Dentotes the keyword item.
     */
    public static int KEYWORD_ELEMENT = 2;

    /** The tel icon. */
    private Bitmap telIcon = Bitmap.getBitmapResource( "tel16.png" );
    
    /** The phone icon. */
    private Bitmap phoneIcon = Bitmap.getBitmapResource( "phone_16x16.gif" );

    /** The sms icon. */
    private Bitmap smsIcon = Bitmap.getBitmapResource( "sms_16x16.gif" );
    
    /** The fax icon. */
    private Bitmap faxIcon = Bitmap.getBitmapResource( "fax_16x16.gif" );
    
    /** The email icon. */
    private Bitmap emailIcon = Bitmap.getBitmapResource( "email_16x16.gif" );
    
    /** The web icon. */
    private Bitmap webIcon = Bitmap.getBitmapResource( "web_16x16.gif" );        

    /** The gtalk im icon. */
    private Bitmap gtalkIcon = Bitmap.getBitmapResource( "im_16x16.gif" );
    
    /** The xmppIcon im icon. */
    private Bitmap xmppIcon = Bitmap.getBitmapResource( "im_16x16.gif" );

    /** The xmppIcon im icon. */
    private Bitmap xmppVoiceIcon = Bitmap.getBitmapResource( "voip_16x16.gif" );

    /** The aim im icon. */
    private Bitmap aimIcon = Bitmap.getBitmapResource( "im_16x16.gif" );

    /** The aim im icon. */
    private Bitmap aimVoiceIcon = Bitmap.getBitmapResource( "voip_16x16.gif" );
    
    /** The mobile icon. */
    private Bitmap mobileIcon = Bitmap.getBitmapResource( "mobile_16x16.gif" );         

    /** The ftp icon. */
    private Bitmap ftpIcon = Bitmap.getBitmapResource( "ftp_16x16.gif" );

    /** The sip icon. */
    private Bitmap sipIcon = Bitmap.getBitmapResource( "voip_16x16.gif" );
    
    /** The h323 icon. */
    private Bitmap h323Icon = Bitmap.getBitmapResource( "voip_16x16.gif" );

    /** The msn im icon. */
    private Bitmap msnInstantIcon = Bitmap.getBitmapResource( "im_16x16.gif" );
    
    /** The msn voice icon. */
    private Bitmap msnVoiceIcon = Bitmap.getBitmapResource( "voip_16x16.gif" );
    
    /** The skype voice icon. */
    private Bitmap skypeInstantIcon = Bitmap.getBitmapResource( "im_16x16.gif" );
    
    /** The skype voice icon. */
    private Bitmap skypeVoiceIcon = Bitmap.getBitmapResource( "voip_16x16.gif" );

    /** The yahoo icon. */
    private Bitmap yahooIcon = Bitmap.getBitmapResource( "im_16x16.gif" );
    
    /** The icq icon. */
    private Bitmap icqIcon = Bitmap.getBitmapResource( "im_16x16.gif" );

    /** The ntn icon. */
    private Bitmap ntnIcon = Bitmap.getBitmapResource( "link_16x16.gif" );

    /** The ntn icon. */
    private Bitmap ntnBackIcon = Bitmap.getBitmapResource( "link_16x16_rotated.gif" );

    /** The world icon. */
    private Bitmap worldIcon = Bitmap.getBitmapResource( "location_16x16.gif" );
    
    /** The note icon. */
    private Bitmap noteIcon = Bitmap.getBitmapResource( "info_16x16.gif" );
    
    /** The user icon. */
    private Bitmap userIcon = Bitmap.getBitmapResource( "personal_16x16.gif" );

    /** The blank icon. */
    private Bitmap blankIcon = Bitmap.getBitmapResource( "blank.gif" );

    /**
     * The keywords icon.
     */
    private Bitmap keyIcon = Bitmap.getBitmapResource( "keywords_16x16.gif" );

    /**
     * icon.
     */
    private Bitmap icon;

    /**
     * The element type.
     */
    private final Vector elementTypes = new Vector();

    /** The list. */
    private final Vector list = new Vector();

    private Vector displayList = new Vector();

    /** The parsed string. */
    private String parsedString = "";

    /** The service display string. */
    private String serviceDisplayString = "";

    /**
     * Add.
     *
     * @param arg0 the arg0
     * @param rr the rr
     */
    public void add (final ListField arg0, final DNSTelnameNaptrResourceRecord rr)
    {
        try
        {
            if (rr != null && !list.contains( rr ))
            {
                String val = parseNaptrString( rr );
                arg0.insert( list.size() );
                list.addElement( rr );            
                displayList.addElement( val );            
                elementTypes.addElement( new Integer( NONE ) );
            }
        }
        catch (DiscardedNaptrException d)
        {
            //do nothing
            return;
        }
    }


    /**
     * Add.
     *
     * @param arg0 the arg0
     * @param rr the rr
     */
    public void add (final ListField arg0, final DNSLocResourceRecord rr)
    {    
        if (rr != null && !list.contains( rr ))
        {
            arg0.insert( list.size() );
            list.addElement( rr );
            displayList.addElement( rr.toString() );
            elementTypes.addElement( new Integer( NONE ) );
        }                
    }

    /**
     * Add.  used to add the back option.
     *
     * @param arg0 the list field
     * @param rr the string
     */
    public void add (final ListField arg0, final String rr, final int type)
    {

        if (rr != null && !list.contains( rr ))
        {
            arg0.insert( list.size() );
            list.addElement( rr );
            displayList.addElement( rr );
            elementTypes.addElement( new Integer( type ) );

        }
    }

    public boolean scrollingRequired(ListField arg0, int index)
    {
        String element = (String) displayList.elementAt( index );

        if (index == arg0.getSelectedIndex() && (arg0.getFont().getAdvance( element ) > (arg0.getWidth() - telIcon.getWidth() - 2)))
        {
            return true;
        }
        return false;
    }

    public void updateText(ListField arg0, int index)
    {
        String element = (String) displayList.elementAt( index );

        if (index == arg0.getSelectedIndex() && (arg0.getFont().getAdvance( element ) > (arg0.getWidth() - telIcon.getWidth() - 2)))
        {
            element = (String) displayList.elementAt( index );
            displayList.setElementAt( element.substring( 1 ) + element.charAt( 0 ), index );
        }
    }

    public void resetText(ListField arg0, int index)
    {
        displayList = new Vector();
        for (int i = 0; i < list.size(); i++)
        {
            String element = "";
            if (list.elementAt( i ) instanceof DNSTelnameNaptrResourceRecord)
            {
                final DNSTelnameNaptrResourceRecord rr = (DNSTelnameNaptrResourceRecord) list.elementAt( i );
                try
                {
                    element = parseNaptrString( rr );
                }
                catch (DiscardedNaptrException e)
                {
                    Logger.logMessage( "Problem with naptr: " + e.getMessage(), Options.KEY_LOG_APPLICATION );
                }
            }
            if (list.elementAt( i ) instanceof String)
            {
                element = (String) list.elementAt( i );
            }
            else if (list.elementAt( i ) instanceof DNSLocResourceRecord)
            {
                final DNSLocResourceRecord rr = (DNSLocResourceRecord) list.elementAt( i );
                element = rr.toString();
            }
            displayList.addElement( element );
        }


        String element = (String) displayList.elementAt( index );
        if ((arg0.getFont().getAdvance( element ) > (Graphics.getScreenWidth() - telIcon.getWidth() - 2)))
        {
            displayList.setElementAt( element + "  -----  ", index );
        }
    }

    /*
     * (non-Javadoc)
     *
     * @see net.rim.device.api.ui.component.ListFieldCallback#drawListRow(net.rim.device.api.ui.component.ListField,
     *      net.rim.device.api.ui.Graphics, int, int, int)
     */
    public void drawListRow (final ListField arg0, final Graphics g, final int index, final int y,
        final int w)
    {
        if (list.elementAt( index ) instanceof DNSTelnameNaptrResourceRecord)
        {
            final DNSTelnameNaptrResourceRecord rr = (DNSTelnameNaptrResourceRecord) list.elementAt( index );

            final int space = 1;
            try
            {
                Object[] vals = parseNaptrStringAndIcon( rr );
                final String element = (String) vals[0];
                
                if (rr.isEncrypted())
                {
                    g.setFont( g.getFont().derive( Font.ITALIC ) );
                }
                else
                {
                    g.setFont( g.getFont().derive( Font.PLAIN ) );
                }

                g.drawBitmap( 0, y, icon.getWidth(), icon.getHeight(), icon, 0, 0 );
                g.drawText( (String) displayList.elementAt( index ), icon.getWidth() + space, y, 0, w );
            }
            catch (DiscardedNaptrException e)
            {
                Logger.logMessage( "Problem with NAPTR: " + e.getMessage(), Options.KEY_LOG_APPLICATION );
            }           
        }
        if (list.elementAt( index ) instanceof String)
        {
            final String rr = (String) list.elementAt( index );

            final Integer x = (Integer) elementTypes.elementAt( index );

            final int space = 1;
            if (x.intValue() == BACK_ELEMENT)
            {
                icon = ntnBackIcon;
            }
            else if (x.intValue() == KEYWORD_ELEMENT)
            {
                icon = keyIcon;
            }
            else
            {
                icon = blankIcon;
            }

            g.drawBitmap( 0, y, icon.getWidth(), icon.getHeight(), icon, 0, 0 );
            g.drawText( (String) displayList.elementAt( index ), icon.getWidth() + space, y, 0, w );
        }
        else if (list.elementAt( index ) instanceof DNSLocResourceRecord)
        {
            final DNSLocResourceRecord rr = (DNSLocResourceRecord) list.elementAt( index );
            icon = worldIcon;
            final int space = 1;
            final String element = rr.toString();

            g.drawBitmap( 0, y, icon.getWidth(), icon.getHeight(), icon, 0, 0 );
            g.drawText( (String) displayList.elementAt( index ), icon.getWidth() + space, y, 0, w );
        }
    }

    /**
     * getLocIcon.
     *
     * @return loc icon
     */
    public Bitmap getLocIcon ()
    {
        return worldIcon;
    }

    /**
     * returns the element type
     */
    public int getElementType(int index)
    {
        Integer x = (Integer) elementTypes.elementAt( index );
        return x.intValue();
    }


    /**
     * parse naptr string and icon.
     *
     * @param rr the rr
     * @return object
     */
    public Object[] parseNaptrStringAndIcon (DNSTelnameNaptrResourceRecord rr)  throws DiscardedNaptrException
    {
        String element = "";
        serviceDisplayString = "";

        if (rr.isNonTerminal())
        {
            element = rr.getNTNDisplayName();
            icon = ntnIcon;
            serviceDisplayString = TelnameApp.getResourceBundle().getString( TelnameAppResource.SERVICE_TYPE_NTN );
        }
        else
        {            
            String service = rr.getServiceType();
            
            element = rr.getUri();
            Vector categories = rr.getCategories();
            
            //calculate LIH prefix
            if (categories.size() > 0)
            {
                Enumeration e = categories.elements();
                serviceDisplayString += parseLIH( (String) e.nextElement() );
                
                while (e.hasMoreElements())
                {
                    serviceDisplayString += " " + TelnameApp.getResourceBundle().getString( TelnameAppResource.AND ) + " ";
                    serviceDisplayString += parseLIH( (String) e.nextElement() );
                }
                
                serviceDisplayString += " ";                
            }                                    
                                                                           
//          Phone**************************************************************************
            if (service.indexOf( "voice:tel" ) >= 0)
            {               
                checkUriType( service, element );
                icon = phoneIcon;
                if (categories.contains( "x-mobile" ))
                {
                    icon = mobileIcon;
                }
                element = element.substring( element.indexOf( ":" ) + 1 );
                serviceDisplayString += TelnameApp.getResourceBundle().getString( TelnameAppResource.SERVICE_TYPE_PHONE );            
            }
            else if (service.indexOf( "fax:tel" ) >= 0)
            {
                checkUriType( service, element );
                icon = faxIcon;
                element = element.substring( element.indexOf( ":" ) + 1 );
                serviceDisplayString += TelnameApp.getResourceBundle().getString( TelnameAppResource.SERVICE_TYPE_FAX );                
            }
            else if (service.indexOf( "sms:tel" ) >= 0 || service.indexOf( "sms:mailto" ) >= 0)
            {
                checkUriType( service, element );
                icon = smsIcon;
                element = element.substring( element.indexOf( ":" ) + 1 );
                serviceDisplayString += TelnameApp.getResourceBundle().getString( TelnameAppResource.SERVICE_TYPE_SMS );
            }
            else if (service.indexOf( "ems:tel" ) >= 0 || service.indexOf( "ems:mailto" ) >= 0)
            {
                checkUriType( service, element );
                icon = smsIcon;
                element = element.substring( element.indexOf( ":" ) + 1 );
                serviceDisplayString += TelnameApp.getResourceBundle().getString( TelnameAppResource.SERVICE_TYPE_EMS );
            }
            else if (service.indexOf( "mms:tel" ) >= 0 || service.indexOf( "mms:mailto" ) >= 0)
            {
                checkUriType( service, element );
                icon = smsIcon;
                element = element.substring( element.indexOf( ":" ) + 1 );
                serviceDisplayString += TelnameApp.getResourceBundle().getString( TelnameAppResource.SERVICE_TYPE_MMS );
            }

            //AIM**************************************************************************
            else if (service.indexOf( "x-im:aim" ) >= 0)
            {
                checkUriType( service, element );
                icon = aimIcon;
                element = element.substring( element.indexOf( ":" ) + 1 );
                serviceDisplayString += TelnameApp.getResourceBundle().getString( TelnameAppResource.SERVICE_TYPE_AIM_MESS );
            }
            else if (service.indexOf( "x-voice:aim" ) >= 0)
            {
                checkUriType( service, element );
                icon = aimVoiceIcon;
                element = element.substring( element.indexOf( ":" ) + 1 );
                serviceDisplayString += TelnameApp.getResourceBundle().getString( TelnameAppResource.SERVICE_TYPE_AIM_VOICE );
            }            

            // XMPP/GTALK*******************************************************************
            else if (service.indexOf( "x-im:xmpp" ) >= 0)
            {
                checkUriType( service, element );
                icon = xmppIcon;
                element = element.substring( element.indexOf( ":" ) + 1 );
                serviceDisplayString += TelnameApp.getResourceBundle().getString( TelnameAppResource.SERVICE_TYPE_XMPP_MESS );
            }
            else if (service.indexOf( "x-voice:gtalk" ) >= 0)
            {
                checkUriType( service, element );
                icon = xmppVoiceIcon;
                element = element.substring( element.indexOf( ":" ) + 1 );
                serviceDisplayString += TelnameApp.getResourceBundle().getString( TelnameAppResource.SERVICE_TYPE_GTALK_VOICE );
            }
            else if (service.indexOf( "x-im:gtalk" ) >= 0)
            {
                checkUriType( service, element );
                icon = gtalkIcon;
                element = element.substring( element.indexOf( ":" ) + 1 );
                serviceDisplayString += TelnameApp.getResourceBundle().getString( TelnameAppResource.SERVICE_TYPE_GTALK_MESS );
            }
            
//          SKYPE***************************************************************************            
            else if (service.indexOf( "x-voice:skype" ) >= 0)
            {
                checkUriType( service, element );
                icon = skypeVoiceIcon;
                element = element.substring( element.indexOf( ":" ) + 1 );
                serviceDisplayString += TelnameApp.getResourceBundle().getString( TelnameAppResource.SERVICE_TYPE_SKYPE_VOICE );
            }
            else if (service.indexOf( "x-im:skype" ) >= 0)
            {
                checkUriType( service, element );
                icon = skypeInstantIcon;
                element = element.substring( element.indexOf( ":" ) + 1 );
                serviceDisplayString += TelnameApp.getResourceBundle().getString( TelnameAppResource.SERVICE_TYPE_SKYPE_IM );
            }
            
//          MSN***************************************************************************
            else if (service.indexOf( "x-im:msn" ) >= 0)
            {
                checkUriType( service, element );
                icon = msnInstantIcon;
                element = element.substring( element.indexOf( ":" ) + 1 );
                serviceDisplayString += TelnameApp.getResourceBundle().getString( TelnameAppResource.SERVICE_TYPE_MSN_MESS );
            }  
            else if (service.indexOf( "x-voice:msn" ) >= 0)
            {
                checkUriType( service, element );
                icon = msnVoiceIcon;
                element = element.substring( element.indexOf( ":" ) + 1 );
                serviceDisplayString += TelnameApp.getResourceBundle().getString( TelnameAppResource.SERVICE_TYPE_MSN_VOICE );
            }
//          YAHOO*******************************************************************
            else if (service.indexOf( "x-im:ymsgr" ) >= 0)
            {
                checkUriType( service, element );
                icon = yahooIcon;
                element = element.substring( element.indexOf( ":" ) + 1 );
                serviceDisplayString += TelnameApp.getResourceBundle().getString( TelnameAppResource.SERVICE_TYPE_YAHOO_MESS );
            }
//          ICQ*******************************************************************
            else if (service.indexOf( "x-im:icq" ) >= 0)
            {
                checkUriType( service, element );
                icon = icqIcon;
                element = element.substring( element.indexOf( ":" ) + 1 );
                serviceDisplayString += TelnameApp.getResourceBundle().getString( TelnameAppResource.SERVICE_TYPE_ICQ_MESS );
            }            
            
//          OTHER*******************************************************************
            else if (service.indexOf( "sip" )>= 0)
            {
                icon = sipIcon;
                element = element.substring( element.indexOf( ":" ) + 1 );
                serviceDisplayString += TelnameApp.getResourceBundle().getString( TelnameAppResource.SERVICE_TYPE_SIP );
            }
            else if (service.indexOf( "h323" )>= 0)
            {
                icon = h323Icon;
                element = element.substring( element.indexOf( ":" ) + 1 );
                serviceDisplayString += TelnameApp.getResourceBundle().getString( TelnameAppResource.SERVICE_TYPE_H323 );
            }
            else if (service.indexOf( "x-crypto" ) >= 0)
            {
                icon = telIcon;
                element = "Encrypted";
                serviceDisplayString = "";
            }            
            else if (service.indexOf( "email:mailto" ) >= 0)
            {
                checkUriType( service, element );
                icon = emailIcon;
                element = element.substring( element.indexOf( ":" ) + 1 );
                serviceDisplayString += TelnameApp.getResourceBundle().getString( TelnameAppResource.SERVICE_TYPE_EMAIL );
            }
            else if (service.indexOf( "web:http" ) >= 0)
            {
                checkUriType( service, element );
                icon = webIcon;
                serviceDisplayString += TelnameApp.getResourceBundle().getString( TelnameAppResource.SERVICE_TYPE_WEB_SITE );
            }
            else if (service.indexOf( "web:https" ) >= 0)
            {
                checkUriType( service, element );
                icon = webIcon;
                serviceDisplayString += TelnameApp.getResourceBundle().getString( TelnameAppResource.SERVICE_TYPE_SECURE_WEB_SITE );
            }
            else if (service.indexOf( "ft:ftp" ) >= 0)
            {
                checkUriType( service, element );
                icon = ftpIcon;
                serviceDisplayString += TelnameApp.getResourceBundle().getString( TelnameAppResource.SERVICE_TYPE_FTP );
            }
            else if (service.indexOf( "note:data" ) >= 0)
            {
                checkUriType( service, element );
                icon = noteIcon;
                element = decodeDataUri( element );
                serviceDisplayString += TelnameApp.getResourceBundle().getString( TelnameAppResource.SERVICE_TYPE_NOTE );                
            }
            else if (service.indexOf( "user:data" ) >= 0)
            {
                checkUriType( service, element );
                icon = userIcon;
                element = decodeDataUri( element );
                serviceDisplayString += TelnameApp.getResourceBundle().getString( TelnameAppResource.SERVICE_TYPE_USER );                
            }
            else
            {
                icon = blankIcon;
                                
                if( service.startsWith( "x-" ))
                {
                    service = ( service.substring( 2 ) );
                }    
                if (service.indexOf( ":data" ) >= 0)
                {
                    element = decodeDataUri( element );
                }
                serviceDisplayString += service;
            }
        }
        parsedString = element;

        Object[] returnvals = { element, icon };
        return returnvals;
    }

    /**
     * parse naptr string
     *
     * @param rr
     * @return string
     */
    public String parseNaptrString (DNSTelnameNaptrResourceRecord rr) throws DiscardedNaptrException
    {
        parseNaptrStringAndIcon( rr );
        String element = parsedString;
        return element;
    }
    
    /**
     * parses a LIH and returns the display string.
     * 
     * @param string the LIH
     * @return the display string
     */
    public String parseLIH(String lih)
    {        
        ResourceBundle bundle = TelnameApp.getResourceBundle();
        
        if (lih.equals( "x-main" ))
        {
            return bundle.getString( TelnameAppResource.LIH_CATEGORY_MAIN );
        }
        else if (lih.equals( "x-home" ))
        {
            return bundle.getString( TelnameAppResource.LIH_CATEGORY_HOME );
        }
        else if (lih.equals( "x-mobile" ))
        {
            return bundle.getString( TelnameAppResource.LIH_CATEGORY_MOBILE );
        } 
        else if (lih.equals( "x-work" ))
        {
            return bundle.getString( TelnameAppResource.LIH_CATEGORY_WORK );
        } 
        else if (lih.equals( "x-transit" ))
        {
            return bundle.getString( TelnameAppResource.LIH_CATEGORY_TRANSIT );
        } 
        else if (lih.equals( "x-prs" ))
        {
            return bundle.getString( TelnameAppResource.LIH_CATEGORY_PRS );
        } 
            
        return "";
    }

    public String getServiceString (int index)
    {
        if (!(list.elementAt( index ) instanceof DNSTelnameNaptrResourceRecord))
        {
            return "";
        }
        else
        {
            try
            {
                DNSTelnameNaptrResourceRecord rr = (DNSTelnameNaptrResourceRecord) list.elementAt( index );
                parseNaptrStringAndIcon( rr );
                return serviceDisplayString;
            }
            catch (DiscardedNaptrException e)
            {
                Logger.logMessage( "Problem with NAPTR: " + e.getMessage(), Options.KEY_LOG_APPLICATION );
                return "";
            }
        }
    }


    /*
     * (non-Javadoc)
     *
     * @see net.rim.device.api.ui.component.ListFieldCallback#get(net.rim.device.api.ui.component.ListField,
     *      int)
     */
    public Object get (final ListField arg0, final int index)
    {
        return list.elementAt( index );
    }

    public String getString (final ListField arg0, final int index)
    {
        String element = "";
        if (list.elementAt( index ) instanceof DNSTelnameNaptrResourceRecord)
        {
            final DNSTelnameNaptrResourceRecord rr = (DNSTelnameNaptrResourceRecord) list.elementAt( index );
            try
            {
                element = parseNaptrString( rr );
            }
            catch (DiscardedNaptrException e)
            {
                Logger.logMessage( "Problem with NAPTR: " + e.getMessage(), Options.KEY_LOG_APPLICATION );
            }
        }
        if (list.elementAt( index ) instanceof String)
        {
            element = (String) displayList.elementAt( index );
        }
        else if (list.elementAt( index ) instanceof DNSLocResourceRecord)
        {
            final DNSLocResourceRecord rr = (DNSLocResourceRecord) list.elementAt( index );
            element = rr.toString();
        }
        return element;
    }

    /**
     * size.
     *
     * @return size
     */
    public int size ()
    {
        return list.size();
    }

    /*
     * (non-Javadoc)
     *
     * @see net.rim.device.api.ui.component.ListFieldCallback#getPreferredWidth(net.rim.device.api.ui.component.ListField)
     */
    public int getPreferredWidth (final ListField arg0)
    {
        return 0;
    }

    private String decodeDataUri(String uri) throws DiscardedNaptrException
    {
        String returnData = "";
        
        if (uri.startsWith( "data:," )  || uri.startsWith( "data:text/plain;charset=US-ASCII," ) )
        {
            returnData = uri.substring( uri.indexOf( "," ) + 1 );
        }
        else if (uri.startsWith( "data:;base64," ) || uri.startsWith( "data:text/plain;charset=US-ASCII;base64," ))
        {
            returnData = uri.substring( uri.indexOf( "," ) + 1 );            
            try
            {
                returnData = new String (Base64.decode( returnData ), "US-ASCII");
            }
            catch (UnsupportedEncodingException e)
            {   
                throw new DiscardedNaptrException("Problem Unencoding data uri: " + e.getMessage());                
            } 
        }
        
        return returnData;
    }
    
    private void checkUriType(String service, String uri) throws DiscardedNaptrException
    {
        String serviceType = service.substring( service.indexOf( ":" ) + 1 );
        if (!uri.startsWith( serviceType ))
        {
            throw new DiscardedNaptrException("URI scheme does not match service.");
        }        
    }

    /*
     * (non-Javadoc)
     *
     * @see net.rim.device.api.ui.component.ListFieldCallback#indexOfList(net.rim.device.api.ui.component.ListField,
     *      java.lang.String, int)
     */
    public int indexOfList (final ListField arg0, final String arg1, final int arg2)
    {
        return 0;
    }
}