public class ContactStorage extends AbstractMemStorage
{
    //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    // Initialization
    //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

    /**
     * Creates a new instance of <code>ContactStorage</code>.
     */
    public ContactStorage()
    {
    }

    //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    // Abstract methods implementation
    //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    
    @Override
    public RowDefinition getRowDefinition() throws ModelException
    {
        RowDefinition rdef = new RowDefinition();
        rdef.addColumnDefinition(new ColumnDefinition("ID", new BigDecimalDataType()));
        rdef.addColumnDefinition(new ColumnDefinition("FIRST"));
        rdef.addColumnDefinition(new ColumnDefinition("LAST"));
        
        rdef.setPrimaryKeyColumnNames(new String[] {"ID"});
        
        rdef.setColumnView(null, new ColumnView(rdef));
        
        return rdef;
    }

    @Override
    public void loadData(MemDataBook pBook, ICondition pCondition) throws ModelException
    {
        pBook.close();
        pBook.open();
        
        ClientResource cres = new ClientResource("https://cloud.sibvisions.com/demoerp/services/rest/DemoERP/Customers/data/customer/");
        cres.setChallengeResponse(ChallengeScheme.HTTP_BASIC, "manager", "manager");
        
        try
        {
            List<Map<String, Object>> list = JSONUtil.getObject(cres.get(), List.class);
            
            for (Map<String, Object> m : list)
            {
                pBook.insert(false);
                pBook.setValues(new String[] {"ID", "FIRST", "LAST"}, 
                                new Object[] {new BigDecimal((BigInteger)m.get("ID")), m.get("FIRSTNAME"), m.get("SURNAME")} ); 
            }
            
            pBook.saveAllRows();
        }
        catch (IOException ioe)
        {
            throw new ModelException(ioe);
        }
    }

    @Override
    public void insert(DataBookEvent pEvent) throws ModelException
    {
    }

    @Override
    public void update(DataBookEvent pEvent) throws ModelException
    {
    }

    @Override
    public void delete(DataBookEvent pEvent) throws ModelException
    {
    }

}