Custom Widget of CellTable, dataprovider, pager etc with ability to hide/show columns

SuperTable.java

package com.utilitiessavings.usavappv7.client.application.us;

import com.allen_sauer.gwt.log.client.Log;
import com.google.common.collect.Maps;
import com.google.gwt.core.client.GWT;
import com.google.gwt.event.logical.shared.ValueChangeEvent;
import com.google.gwt.event.logical.shared.ValueChangeHandler;
import com.google.gwt.uibinder.client.UiBinder;
import com.google.gwt.uibinder.client.UiField;
import com.google.gwt.user.cellview.client.Column;
import com.google.gwt.user.cellview.client.SimplePager;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.HTMLPanel;
import com.google.gwt.user.client.ui.Panel;
import com.google.gwt.view.client.ListDataProvider;
import org.gwtbootstrap3.client.ui.gwt.CellTable;
import org.gwtbootstrap3.extras.select.client.ui.MultipleSelect;
import org.gwtbootstrap3.extras.select.client.ui.Option;

import java.util.List;
import java.util.Map;

/**
 * Created by Drew on 07/06/2017.
 */
public class SuperTable<T> extends Composite
{
    @UiField
    MultipleSelect columnSelect;

    @UiField
    Panel emptyPanel, tablePanel;

    @UiField
    CellTable<T> table;

    @UiField
    SimplePager pager;

    private ListDataProvider<T> dataProvider = new ListDataProvider<>();

    private Map<String, Column<T, ?>> columnsMap = Maps.newHashMap();

    interface Binder extends UiBinder<HTMLPanel, SuperTable>
    {

    }

    private static Binder uiBinder = GWT.create(Binder.class);

    public SuperTable()
    {
        initWidget(uiBinder.createAndBindUi(this));

        columnSelect.addValueChangeHandler(new ValueChangeHandler<List<String>>()
        {
            @Override
            public void onValueChange(ValueChangeEvent<List<String>> event)
            {
                Log.info("SuperTable -> onColumnSelect: " + event.getValue());

                setSelectedColumns(columnSelect.getValue().toArray(new String[0]));
            }
        });

    }


    public void setColumnsMap(Map<String, Column<T, ?>> columnsMap)
    {
        this.columnsMap = columnsMap;

        initTable();

    }

    void initTable()
    {
        // link the dataprovider to the table
        dataProvider.addDataDisplay(table);

        // loop the columns, creating an option for each in the
        for(String name : columnsMap.keySet())
        {
            Option option = new Option();
            option.setText(name);
            option.setSelected(true);

            // pass it in to the select
            columnSelect.add(option);
        }

        setSelectedColumns(columnSelect.getValue().toArray(new String[0]));

    }

    public void setData(List<T> data)
    {
        dataProvider.setList(data);

        pager.setDisplay(table);

        // hide or show panels
        if(data.isEmpty())
        {
            emptyPanel.setVisible(true);
            tablePanel.setVisible(false);
        }
        else
        {
            emptyPanel.setVisible(false);
            tablePanel.setVisible(true);
        }

    }

    private void setSelectedColumns(String[] values)
    {
        int columnCount = table.getColumnCount();

        // remove all columns
        for(int i = 0; i < columnCount; i++)
        {
            Log.info("QuotesView -> setSelectedColumns: removing column 0");
            table.removeColumn(0);
        }

        // loop the selected values and add them
        for(String columnName : values)
        {
            table.addColumn(columnsMap.get(columnName), columnName);
        }
    }


}

SuperTable.ui.xml

<!DOCTYPE ui:UiBinder SYSTEM "http://dl.google.com/gwt/DTD/xhtml.ent">
<ui:UiBinder xmlns:ui="urn:ui:com.google.gwt.uibinder"
             xmlns:b="urn:import:org.gwtbootstrap3.client.ui"
             xmlns:b.gwt="urn:import:org.gwtbootstrap3.client.ui.gwt"
             xmlns:b.html="urn:import:org.gwtbootstrap3.client.ui.html"
             xmlns:b.select="urn:import:org.gwtbootstrap3.extras.select.client.ui"
             xmlns:g="urn:import:com.google.gwt.user.client.ui"
             xmlns:cellview="urn:import:com.google.gwt.user.cellview.client">
    
    <g:HTMLPanel>
        
        <b:Panel>
            <b:PanelHeader addStyleNames="clearfix">
                <b:Row>
                    <b:Column size="XS_12 SM_6 MD_4">
                        <!--TODO this is a filter based on the user profile-->
                        <!--<b:InputGroup>-->
                            <!--<b:InputGroupAddon>Belonging to</b:InputGroupAddon>-->
                            <!--<b:ValueListBox ui:field="scopeListBox"/>-->
                        <!--</b:InputGroup>-->
                    </b:Column>
                    <b:Column size="XS_12 SM_6 MD_4" offset="MD_4" pull="RIGHT">
                        <b.html:Div pull="RIGHT">
                            <b:InputGroup>
                                <b.select:MultipleSelect ui:field="columnSelect" title="Select" countSelectedTextFormat="2"/>
                                <b:InputGroupAddon icon="COLUMNS">Columns</b:InputGroupAddon>
                            </b:InputGroup>
                        </b.html:Div>
                    </b:Column>
                </b:Row>
            </b:PanelHeader>
            
            <g:HTMLPanel ui:field="emptyPanel">
                <b:Heading size="H3" text="List of contracts is empty" alignment="CENTER" color="#888" paddingBottom="10"/>
            </g:HTMLPanel>
            
            <g:ScrollPanel width="100%" ui:field="tablePanel">
                <b.gwt:CellTable ui:field="table"/>
            </g:ScrollPanel>
            
            <cellview:SimplePager ui:field="pager" location="CENTER"/>
        
        </b:Panel>
    
    </g:HTMLPanel>

</ui:UiBinder>