tabular-data-csv-import-widget/src/main/java/org/gcube/portlets/user/td/csvimportwidget/client/csvgrid/CSVGrid.java

/**
 * 
 */
package org.gcube.portlets.user.td.csvimportwidget.client.csvgrid;

import java.util.ArrayList;

import org.gcube.portlets.user.csvimportwizardtd.client.data.CSVRow;
import org.gcube.portlets.user.csvimportwizardtd.client.data.CSVRowKeyProvider;
import org.gcube.portlets.user.csvimportwizardtd.client.data.CSVRowValueProvider;


import com.allen_sauer.gwt.log.client.Log;
import com.google.gwt.core.client.GWT;
import com.google.gwt.http.client.RequestBuilder;
import com.sencha.gxt.core.client.IdentityValueProvider;
import com.sencha.gxt.data.client.loader.HttpProxy;
import com.sencha.gxt.data.shared.ListStore;
import com.sencha.gxt.data.shared.loader.DataReader;
import com.sencha.gxt.data.shared.loader.ListLoadConfig;
import com.sencha.gxt.data.shared.loader.ListLoadResult;
import com.sencha.gxt.data.shared.loader.ListLoader;
import com.sencha.gxt.data.shared.loader.LoadResultListStoreBinding;
import com.sencha.gxt.widget.core.client.grid.ColumnConfig;
import com.sencha.gxt.widget.core.client.grid.ColumnModel;
import com.sencha.gxt.widget.core.client.grid.Grid;
import com.sencha.gxt.widget.core.client.grid.RowNumberer;


/**
 * 
 * @author "Giancarlo Panichi" 
 * <a href="mailto:g.panichi@isti.cnr.it">g.panichi@isti.cnr.it</a> 
 *
 */
public class CSVGrid extends Grid<CSVRow> {
	
	private static final String csvImportFileServlet="CSVImportFileServlet";
	protected CSVGridView gridViewSample;

	public CSVGrid()
	{
		super(new ListStore<CSVRow>(new CSVRowKeyProvider()), new ColumnModel<CSVRow>(new ArrayList<ColumnConfig<CSVRow,?>>()));

		setHeight(200);  
		setBorders(true);

		getView().setStripeRows(true);
		setLoadMask(true);
		
		gridViewSample = new CSVGridView();
		setView(gridViewSample);

		getView().setEmptyText("No data to show");
		setBorders(true);
	}

	public void configureColumns(ArrayList<String> columnNames)
	{
		ColumnModel<CSVRow> columnModel = createColumnModel(columnNames);
		ListStore<CSVRow> store = createStore(columnNames);
		reconfigure(store, columnModel);
		getView().refresh(true);
	}

	protected ListStore<CSVRow> createStore(ArrayList<String> columnNames)
	{
		String path =  GWT.getModuleBaseURL()+csvImportFileServlet;  
		Log.info("CSVImportFileServlet path:"+path);
		// use a http proxy to get the data  
		RequestBuilder builder = new RequestBuilder(RequestBuilder.GET, path);
		
		HttpProxy<ListLoadConfig> proxy = new HttpProxy<ListLoadConfig>(builder);


		// need a loader, proxy, and reader  
		DataReader<ListLoadResult<CSVRow>, String> reader = new CSVJsonReader();


		final ListLoader<ListLoadConfig, ListLoadResult<CSVRow>> loader = new ListLoader<ListLoadConfig, ListLoadResult<CSVRow>>(proxy, reader);

		ListStore<CSVRow> store = new ListStore<CSVRow>(new CSVRowKeyProvider());
		loader.addLoadHandler(new LoadResultListStoreBinding<ListLoadConfig, CSVRow, ListLoadResult<CSVRow>>(store));
		
		loader.load();

		return store;

	}

	protected ColumnModel<CSVRow> createColumnModel(ArrayList<String> columnNames)
	{
		ArrayList<ColumnConfig<CSVRow, ?>> columns = new ArrayList<ColumnConfig<CSVRow, ?>>(); 

		columns.add(new RowNumberer<CSVRow>(new IdentityValueProvider<CSVRow>()));

		for (int i = 0; i<columnNames.size(); i++) {
			String columnField = "field"+(i+1);
			String columnName = columnNames.get(i);
			ColumnConfig<CSVRow, String> columnConfig = new ColumnConfig<CSVRow, String>(new CSVRowValueProvider(columnField), 100, columnName);
			columns.add(columnConfig);
		}

		return new ColumnModel<CSVRow>(columns);
	}

	/**
	 * Returns the import column mask.
	 * @return an array of boolean where the item is <code>true</code> if the column have to be imported, <code>false</code> otherwise.
	 */
	public boolean[] getImportColumnsMask()
	{
		boolean[] columnMask = new boolean[getColumnModel().getColumnCount()];
		ArrayList<Integer> excluded = gridViewSample.getExcludedColumns();
		for (int i = 0; i<columnMask.length; i++) columnMask[i] = !excluded.contains(i);
		return columnMask;
	}

}