Working on Pagination

git-svn-id: https://svn.d4science.research-infrastructures.eu/gcube/trunk/portlets/widgets/workspace-explorer@150997 82a268e6-3cf1-43bd-a215-b396298e98cf

src/main/java/org/gcube/portlets/widgets/wsexplorer/client/Util.java

@@ -1,5 +1,5 @@
 /**
- * 
+ *
  */
 package org.gcube.portlets.widgets.wsexplorer.client;
 
@@ -18,7 +18,7 @@ import com.google.gwt.user.client.ui.SimplePanel;
  * @author Francesco Mangiacrapa francesco.mangiacrapa@isti.cnr.it Jun 18, 2015
  */
 public class Util {
-	
+
 //	public static final NumberFormat numberFormatterKB = NumberFormat.getFormat("#,##0 KB;(#,##0 KB)");
 
 	public static final ItemType[] FOLDERS = new ItemType[] {ItemType.FOLDER};
@@ -60,7 +60,7 @@ public class Util {
 		}
 		return value;
 	}
-	
+
 
 	/**
 	 * Returns the image based on the item type.
@@ -69,6 +69,9 @@ public class Util {
 	 */
 	public static ImageResource getImage(Item item)
 	{
+		if(item==null)
+			return null;
+
 		switch (item.getType()) {
 //			case ROOT: return WorkspaceLightTreeResources.INSTANCE.root();
 			case FOLDER: {
@@ -95,9 +98,9 @@ public class Util {
 			}
 		}
 	}
-	
+
 	/**
-	 * 
+	 *
 	 * @param value
 	 * @return
 	 */
@@ -114,17 +117,17 @@ public class Util {
 		}else
 			return "";
 	}
-	
+
 	public static void adjustSize(Element el, SimplePanel panel, int offset){
 		if(el!=null){
 			int heigth = el.getClientHeight();
 			GWT.log("getClientHeight adjustSize el: "+heigth);
-			heigth = (heigth-offset>100)?heigth-offset:0;
+			heigth = heigth-offset>100?heigth-offset:0;
 			if(heigth>0){
 				GWT.log("set new Explorer size: "+heigth);
 				panel.setHeight(heigth+"px");
 			}
 		}
 	}
-	
+
 }

src/main/java/org/gcube/portlets/widgets/wsexplorer/client/WorkspaceExplorerConstants.java

@@ -6,6 +6,7 @@ import org.gcube.portlets.widgets.wsexplorer.client.rpc.WorkspaceExplorerService
 import com.google.gwt.core.client.GWT;
 
 
+
 /**
  * The Class WorkspaceExplorerConstants.
  *
@@ -38,5 +39,6 @@ public class WorkspaceExplorerConstants {
 
 	public static final WorkspaceExplorerServiceAsync workspaceNavigatorService = GWT.create(WorkspaceExplorerService.class);
 
-	public static int ITEMS_PER_PAGE = 10;
+	public static int ITEMS_PER_PAGE = 20;
+	public static int ITEM_START_INDEX = 0;
 }

src/main/java/org/gcube/portlets/widgets/wsexplorer/client/WorkspaceExplorerController.java

@@ -69,8 +69,9 @@ public class WorkspaceExplorerController implements EventHandler {
 	public WorkspaceExplorerController(String heightPanel){
 		bindEvents();
 		//As default all items are showable and selectable
-		wsExplorer = new WorkspaceExplorer(eventBus, ItemType.values(), ItemType.values(), new ListDataProvider<Item>());
+		wsExplorer = new WorkspaceExplorer(eventBus, ItemType.values(), ItemType.values());
-		workspaceExplorerPanel = new WorkspaceExplorerPanel(5, wsExplorer.getPanel(), breadcrumbs, navigation, heightPanel);
+		wsExplorer.initTable(new ListDataProvider<Item>());
+		initExplorerPanel(heightPanel);
 	}
 
 	/**
@@ -84,8 +85,9 @@ public class WorkspaceExplorerController implements EventHandler {
 	public WorkspaceExplorerController(FilterCriteria filterCriteria, String heightPanel) {
 		bindEvents();
 		//As default all items are showable and selectable
-		wsExplorer = new WorkspaceExplorer(eventBus, filterCriteria, ItemType.values(), ItemType.values(), null, false, null, new ListDataProvider<Item>());
+		wsExplorer = new WorkspaceExplorer(eventBus, filterCriteria, ItemType.values(), ItemType.values(), null, false, null);
-		workspaceExplorerPanel = new WorkspaceExplorerPanel(5, wsExplorer.getPanel(), breadcrumbs, navigation, heightPanel);
+		wsExplorer.initTable(new ListDataProvider<Item>());
+		initExplorerPanel(heightPanel);
 	}
 
 
@@ -102,8 +104,21 @@ public class WorkspaceExplorerController implements EventHandler {
 	public WorkspaceExplorerController(FilterCriteria filterCriteria, List<String> showProperties, String heightPanel) {
 		bindEvents();
 		//As default all items are showable and selectable
-		wsExplorer = new WorkspaceExplorer(eventBus, filterCriteria, ItemType.values(), ItemType.values(), showProperties, false, null, new ListDataProvider<Item>());
+		wsExplorer = new WorkspaceExplorer(eventBus, filterCriteria, ItemType.values(), ItemType.values(), showProperties, false, null);
+		wsExplorer.initTable(new ListDataProvider<Item>());
+		initExplorerPanel(heightPanel);
+	}
+
+
+
+	/**
+	 * Inits the explorer panel.
+	 *
+	 * @param heightPanel the height panel
+	 */
+	private void initExplorerPanel(String heightPanel){
 		workspaceExplorerPanel = new WorkspaceExplorerPanel(5, wsExplorer.getPanel(), breadcrumbs, navigation, heightPanel);
+
 	}
 
 	/**
@@ -123,7 +138,7 @@ public class WorkspaceExplorerController implements EventHandler {
 
 						if(item.isFolder()){
 							try {
-								wsExplorer.loadFolder(item, false);
+								wsExplorer.loadFolder(item, false, -1, -1, true);
 								loadParentBreadcrumbByItemId(item.getId(), true);
 
 								if(item.isSpecialFolder())
@@ -465,6 +480,8 @@ public class WorkspaceExplorerController implements EventHandler {
 	}
 
 	/**
+	 * Gets the event bus.
+	 *
 	 * @return the eventBus
 	 */
 	public HandlerManager getEventBus() {

src/main/java/org/gcube/portlets/widgets/wsexplorer/client/explore/WorkspaceResourcesExplorerPanel.java

@@ -32,15 +32,17 @@ import com.google.gwt.user.client.ui.DockPanel;
 import com.google.gwt.user.client.ui.VerticalPanel;
 import com.google.gwt.view.client.ListDataProvider;
 
-
 /**
  * The Class WorkspaceResourcesExplorerPanel.
  *
  * @author Francesco Mangiacrapa francesco.mangiacrapa@isti.cnr.it
- * Dec 3, 2015
+ * Jul 11, 2017
  */
 public class WorkspaceResourcesExplorerPanel extends DockPanel implements HasWorskpaceExplorerSelectNotificationListener{
 
+	protected static final int ITEMS_PER_PAGE = WorkspaceExplorerConstants.ITEMS_PER_PAGE;
+	protected static final int ITEM_START_INDEX = WorkspaceExplorerConstants.ITEM_START_INDEX;
+
 	public final HandlerManager eventBus = new HandlerManager(null);
 	protected Breadcrumbs breadcrumbs = new Breadcrumbs(eventBus);
 	protected boolean isSelect = false;
@@ -188,9 +190,10 @@ public class WorkspaceResourcesExplorerPanel extends DockPanel implements HasWor
 	protected void initExplorer(String folderId, String folderName, ItemType[] selectableTypes, ItemType[] showableTypes, List<String> showProperties, FilterCriteria filter, boolean showGcubeInfo, DISPLAY_FIELD sortByColumn) throws Exception{
 		setParameters(folderId, folderName, showProperties, filter);
 		bindEvents();
-		wsExplorer = new WorkspaceExplorer(eventBus, filter, showableTypes, selectableTypes, showProperties, showGcubeInfo, sortByColumn,  new ListDataProvider<Item>(), new DISPLAY_FIELD[]{DISPLAY_FIELD.ICON, DISPLAY_FIELD.NAME,DISPLAY_FIELD.CREATION_DATE});
+		wsExplorer = new WorkspaceExplorer(eventBus, filter, showableTypes, selectableTypes, showProperties, showGcubeInfo, sortByColumn, new DISPLAY_FIELD[]{DISPLAY_FIELD.ICON, DISPLAY_FIELD.NAME,DISPLAY_FIELD.CREATION_DATE});
+		wsExplorer.initTable(new ListDataProvider<Item>());
 		Item item = new Item(folderId, folderName, true);
-		wsExplorer.loadFolder(item, true);
+		wsExplorer.loadFolder(item, true, -1, -1, false);
 		initPanel("");
 	}
 
@@ -245,7 +248,7 @@ public class WorkspaceResourcesExplorerPanel extends DockPanel implements HasWor
 						Item item = (Item) loadFolderEvent.getTargetItem();
 						if(item.isFolder()){
 							try {
-								wsExplorer.loadFolder(item, true);
+								wsExplorer.loadFolder(item, true, ITEM_START_INDEX, ITEMS_PER_PAGE, true);
 								loadParentBreadcrumbByItemId(item.getId(), true);
 								clearMoreInfo();
 							} catch (Exception e) {
@@ -460,7 +463,7 @@ public class WorkspaceResourcesExplorerPanel extends DockPanel implements HasWor
 		this.filterCriteria = filterCriteria;
 		wsExplorer.setNewFilterCriteria(filterCriteria);
 		try {
-			wsExplorer.loadFolder(wsExplorer.getDisplayingFolderItem(), true);
+			wsExplorer.loadFolder(wsExplorer.getDisplayingFolderItem(), true, ITEM_START_INDEX, ITEMS_PER_PAGE, true);
 		}
 		catch (Exception e) {
 			wsExplorer.setAlert("Sorry, an error occurred during filter update", AlertType.ERROR);
@@ -477,7 +480,7 @@ public class WorkspaceResourcesExplorerPanel extends DockPanel implements HasWor
 		this.showProperties = showProperties;
 		wsExplorer.setNewShowProperties(showProperties);
 		try {
-			wsExplorer.loadFolder(wsExplorer.getDisplayingFolderItem(), true);
+			wsExplorer.loadFolder(wsExplorer.getDisplayingFolderItem(), true, ITEM_START_INDEX, ITEMS_PER_PAGE, true);
 		}
 		catch (Exception e) {
 			wsExplorer.setAlert("Sorry, an error occurred during show properties update", AlertType.ERROR);
@@ -497,7 +500,7 @@ public class WorkspaceResourcesExplorerPanel extends DockPanel implements HasWor
 		wsExplorer.setNewFilterCriteria(filterCriteria);
 		wsExplorer.setNewShowProperties(showProperties);
 		try {
-			wsExplorer.loadFolder(wsExplorer.getDisplayingFolderItem(), true);
+			wsExplorer.loadFolder(wsExplorer.getDisplayingFolderItem(), true, ITEM_START_INDEX, ITEMS_PER_PAGE, true);
 		}
 		catch (Exception e) {
 			wsExplorer.setAlert("Sorry, an error occurred during filters or properties update", AlertType.ERROR);

src/main/java/org/gcube/portlets/widgets/wsexplorer/client/explore/WorkspaceResourcesExplorerPanelPaginated.java

@@ -3,9 +3,11 @@
  */
 package org.gcube.portlets.widgets.wsexplorer.client.explore;
 
+import static org.gcube.portlets.widgets.wsexplorer.client.explore.WorkspaceResourcesExplorerPanel.ITEMS_PER_PAGE;
+import static org.gcube.portlets.widgets.wsexplorer.client.explore.WorkspaceResourcesExplorerPanel.ITEM_START_INDEX;
+
 import java.util.List;
 
-import org.gcube.portlets.widgets.wsexplorer.client.WorkspaceExplorerConstants;
 import org.gcube.portlets.widgets.wsexplorer.client.event.BreadcrumbClickEvent;
 import org.gcube.portlets.widgets.wsexplorer.client.event.BreadcrumbClickEventHandler;
 import org.gcube.portlets.widgets.wsexplorer.client.event.ClickItemEvent;
@@ -30,9 +32,8 @@ import com.google.gwt.user.client.ui.DockPanel;
  */
 public class WorkspaceResourcesExplorerPanelPaginated extends WorkspaceResourcesExplorerPanel {
 
-	private static final int ITEMS_PER_PAGE = WorkspaceExplorerConstants.ITEMS_PER_PAGE;
 	protected WorkspaceExplorerPaginated wsExplorer;
-	public static int ITEM_START_INDEX = 0;
+
 
 	/**
 	 * Instantiates a new workspace resources explorer panel paginated.
@@ -71,22 +72,6 @@ public class WorkspaceResourcesExplorerPanelPaginated extends WorkspaceResources
 		super(folderId, showOnlyFolders, showProperties, filter);
 	}
 
-
-	/**
-	 * Instantiates a new workspace resources explorer panel paginated.
-	 *
-	 * @param folderId the folder id
-	 * @param showOnlyFolders the show only folders
-	 * @param showProperties the show properties
-	 * @param filter the filter
-	 * @param showGcubeInfo the show gcube info
-	 * @param sortByColumn the sort by column
-	 * @throws Exception the exception
-	 */
-	public WorkspaceResourcesExplorerPanelPaginated(String folderId, boolean showOnlyFolders, List<String> showProperties, FilterCriteria filter, boolean showGcubeInfo, DISPLAY_FIELD sortByColumn) throws Exception {
-		super(folderId, showOnlyFolders, showProperties, filter, showGcubeInfo, sortByColumn);
-	}
-
 	/**
 	 * Inits the explorer.
 	 *
@@ -107,7 +92,7 @@ public class WorkspaceResourcesExplorerPanelPaginated extends WorkspaceResources
 		wsExplorer = new WorkspaceExplorerPaginated(eventBus, filter, showableTypes, selectableTypes, showProperties, showGcubeInfo, sortByColumn, new DISPLAY_FIELD[]{DISPLAY_FIELD.ICON, DISPLAY_FIELD.NAME, DISPLAY_FIELD.CREATION_DATE});
 		wsExplorer.initPagination(ITEMS_PER_PAGE);
 		Item item = new Item(folderId, folderName, true);
-		wsExplorer.loadFolder(item, true, ITEM_START_INDEX, ITEMS_PER_PAGE);
+		wsExplorer.loadFolder(item, true, ITEM_START_INDEX, ITEMS_PER_PAGE, true);
 		initPanel("");
 	}
 
@@ -160,7 +145,7 @@ public class WorkspaceResourcesExplorerPanelPaginated extends WorkspaceResources
 						Item item = (Item) loadFolderEvent.getTargetItem();
 						if(item.isFolder()){
 							try {
-								wsExplorer.loadFolder(item, true, ITEM_START_INDEX, ITEMS_PER_PAGE);
+								wsExplorer.loadFolder(item, true, ITEM_START_INDEX, ITEMS_PER_PAGE, true);
 								loadParentBreadcrumbByItemId(item.getId(), true);
 								clearMoreInfo();
 							} catch (Exception e) {

src/main/java/org/gcube/portlets/widgets/wsexplorer/client/view/FolderLoader.java

@@ -6,12 +6,11 @@ package org.gcube.portlets.widgets.wsexplorer.client.view;
 import org.gcube.portlets.widgets.wsexplorer.shared.Item;
 
 
-
 /**
  * The Interface FolderLoader.
  *
  * @author Francesco Mangiacrapa francesco.mangiacrapa@isti.cnr.it
- * Jul 5, 2017
+ * Jul 11, 2017
  */
 public interface FolderLoader {
 
@@ -20,18 +19,10 @@ public interface FolderLoader {
 	 *
 	 * @param item the item
 	 * @param loadGcubeProperties the load gcube properties
+	 * @param startIdx the start idx. Used for pagination
+	 * @param limit the limit. Used for pagination
+	 * @param resetStore the reset store.  Used for pagination
 	 * @throws Exception the exception
 	 */
-	public void loadFolder(final Item item, boolean loadGcubeProperties) throws Exception;
+	public void loadFolder(final Item item, boolean loadGcubeProperties, int startIdx, int limit, boolean resetStore) throws Exception;
-
-	/**
-	 * Load folder.
-	 *
-	 * @param item the item
-	 * @param loadGcubeProperties the load gcube properties
-	 * @param startIdx the start idx
-	 * @param limit the limit
-	 * @throws Exception the exception
-	 */
-	public void loadFolder(final Item item, boolean loadGcubeProperties, int startIdx, int limit) throws Exception;
 }

src/main/java/org/gcube/portlets/widgets/wsexplorer/client/view/WorkspaceExplorer.java

@@ -76,19 +76,28 @@ public class WorkspaceExplorer implements ShowableTypes, SelectableTypes, Folder
 	 * @param showGcubeInfo the show gcube info
 	 * @param sortByColumn the sort by column
 	 * @param fields the columns to display
-	 * @param dataProvider the data provider
 	 */
-	private WorkspaceExplorer(HandlerManager eventBus, ItemType[] showableTypes, ItemType[] selectableTypes, List<String> displayProperties, boolean showGcubeInfo, DISPLAY_FIELD sortByColumn, DISPLAY_FIELD[] fields, AbstractDataProvider<Item> dataProvider){
+	private WorkspaceExplorer(HandlerManager eventBus, ItemType[] showableTypes, ItemType[] selectableTypes, List<String> displayProperties, boolean showGcubeInfo, DISPLAY_FIELD sortByColumn, DISPLAY_FIELD[] fields){
 		this.eventBus = eventBus;
 		this.showGcubeItemsInfo = showGcubeInfo;
 		this.displayFields = fields;
 		this.sortByColumn = sortByColumn;
 		this.displayProperties = displayProperties;
-		this.dataProvider = dataProvider;
 		this.explorerPanel = new ScrollPanel();
 		setShowableTypes(showableTypes);
 		setSelectableTypes(selectableTypes);
-		this.itTables = new ItemsTable<Item>(eventBus, true, displayFields, displayProperties, showGcubeItemsInfo, sortByColumn, dataProvider);
+	}
+
+
+	/**
+	 * Sets the data provider table.
+	 *
+	 * @param dataProvider the new data provider table
+	 */
+	public void initTable(AbstractDataProvider<Item> dataProvider){
+		this.dataProvider = dataProvider;
+		this.itTables = new ItemsTable<Item>(eventBus, true, displayFields, displayProperties, showGcubeItemsInfo, sortByColumn);
+		this.itTables.initTable(null, null, dataProvider);
 	}
 
 
@@ -98,12 +107,10 @@ public class WorkspaceExplorer implements ShowableTypes, SelectableTypes, Folder
 	 * @param eventBus the event bus
 	 * @param showableTypes the showable types
 	 * @param selectableTypes the selectable types
-	 * @param dataProvider the data provider
 	 * @param fields the fields
 	 */
-	public WorkspaceExplorer(HandlerManager eventBus, ItemType[] showableTypes, ItemType[] selectableTypes, AbstractDataProvider<Item> dataProvider, DISPLAY_FIELD...fields) {
+	public WorkspaceExplorer(HandlerManager eventBus, ItemType[] showableTypes, ItemType[] selectableTypes, DISPLAY_FIELD...fields) {
-		this(eventBus, showableTypes, selectableTypes, null, false, null, fields, dataProvider);
+		this(eventBus, showableTypes, selectableTypes, null, false, null, fields);
-//		itTables = new ItemsTable<Item>(eventBus, true, fields, null, showGcubeItemsInfo);
 	}
 
 
@@ -114,11 +121,10 @@ public class WorkspaceExplorer implements ShowableTypes, SelectableTypes, Folder
 	 * @param showableTypes the showable types
 	 * @param selectableTypes the selectable types
 	 * @param displayProperties the display properties
-	 * @param dataProvider the data provider
 	 * @param fields the fields
 	 */
-	public WorkspaceExplorer(HandlerManager eventBus, ItemType[] showableTypes, ItemType[] selectableTypes, List<String> displayProperties, AbstractDataProvider<Item> dataProvider, DISPLAY_FIELD...fields) {
+	public WorkspaceExplorer(HandlerManager eventBus, ItemType[] showableTypes, ItemType[] selectableTypes, List<String> displayProperties, DISPLAY_FIELD...fields) {
-		this(eventBus, showableTypes, selectableTypes, displayProperties, false, null, fields, dataProvider);
+		this(eventBus, showableTypes, selectableTypes, displayProperties, false, null, fields);
 	}
 
 
@@ -133,11 +139,10 @@ public class WorkspaceExplorer implements ShowableTypes, SelectableTypes, Folder
 	 * @param displayProperties the display properties
 	 * @param showGcubeInfo the show gcube info
 	 * @param sortByColumn the sort by column
-	 * @param dataProvider the data provider
 	 * @param fields the fields
 	 */
-	public WorkspaceExplorer(HandlerManager eventBus, FilterCriteria filterCriteria, ItemType[] showableTypes, ItemType[] selectableTypes, List<String> displayProperties, boolean showGcubeInfo, DISPLAY_FIELD sortByColumn, AbstractDataProvider<Item> dataProvider, DISPLAY_FIELD...fields) {
+	public WorkspaceExplorer(HandlerManager eventBus, FilterCriteria filterCriteria, ItemType[] showableTypes, ItemType[] selectableTypes, List<String> displayProperties, boolean showGcubeInfo, DISPLAY_FIELD sortByColumn, DISPLAY_FIELD...fields) {
-		this(eventBus, showableTypes, selectableTypes, displayProperties, showGcubeInfo, sortByColumn, fields, dataProvider);
+		this(eventBus, showableTypes, selectableTypes, displayProperties, showGcubeInfo, sortByColumn, fields);
 		this.filterCriteria = filterCriteria;
 
 	}
@@ -211,56 +216,56 @@ public class WorkspaceExplorer implements ShowableTypes, SelectableTypes, Folder
 		this.displayingFolderItem = item;
 	}
 
-	/**
+//	/**
-	 * Load folder.
+//	 * Load folder.
-	 *
+//	 *
-	 * @param item the item
+//	 * @param item the item
-	 * @param loadGcubeProperties the load gcube properties
+//	 * @param loadGcubeProperties the load gcube properties
-	 * @throws Exception the exception
+//	 * @throws Exception the exception
-	 */
+//	 */
-	public void loadFolder(final Item item, boolean loadGcubeProperties) throws Exception {
+//	public void loadFolder(final Item item, boolean loadGcubeProperties) throws Exception {
-		GWT.log("loading folder data");
+//		GWT.log("loading folder data");
-		setLoading();
+//		setLoading();
-
+//
-		if(!item.isFolder())
+//		if(!item.isFolder())
-			throw new Exception("Item is not a folder");
+//			throw new Exception("Item is not a folder");
-
+//
-		if(item.getId()==null || item.getId().isEmpty())
+//		if(item.getId()==null || item.getId().isEmpty())
-			throw new Exception("Item id is null or empty");
+//			throw new Exception("Item id is null or empty");
-
+//
-		// we make a copy of showable types
+//		// we make a copy of showable types
-		List<ItemType> showableTypesParam = new ArrayList<ItemType>(showableTypes);
+//		List<ItemType> showableTypesParam = new ArrayList<ItemType>(showableTypes);
-
+//
-		// we get sure that folders are displayed
+//		// we get sure that folders are displayed
-		for (ItemType folder : Util.FOLDERS) {
+//		for (ItemType folder : Util.FOLDERS) {
-			if (!showableTypesParam.contains(folder))
+//			if (!showableTypesParam.contains(folder))
-				showableTypesParam.add(folder);
+//				showableTypesParam.add(folder);
-		}
+//		}
-
+//
-		boolean purgeEmpyFolders = !showEmptyFolders;
+//		boolean purgeEmpyFolders = !showEmptyFolders;
-//			FilterCriteria filterCriteria = new FilterCriteria(allowedMimeTypes,requiredProperties, allowedFileExtensions);
+////			FilterCriteria filterCriteria = new FilterCriteria(allowedMimeTypes,requiredProperties, allowedFileExtensions);
-
+//
-		GWT.log("loading workspace folder by item id from server: "+item.getId());
+//		GWT.log("loading workspace folder by item id from server: "+item.getId());
-		WorkspaceExplorerConstants.workspaceNavigatorService.getFolder(item, showableTypesParam, purgeEmpyFolders, filterCriteria, loadGcubeProperties, new AsyncCallback<Item>() {
+//		WorkspaceExplorerConstants.workspaceNavigatorService.getFolder(item, showableTypesParam, purgeEmpyFolders, filterCriteria, loadGcubeProperties, new AsyncCallback<Item>() {
-
+//
-			@Override
+//			@Override
-			public void onFailure(Throwable caught) {
+//			public void onFailure(Throwable caught) {
-				Window.alert(caught.getMessage());
+//				Window.alert(caught.getMessage());
-				setAlert(caught.getMessage(), AlertType.ERROR);
+//				setAlert(caught.getMessage(), AlertType.ERROR);
-				GWT.log("Error loading workspace folder from server",caught);
+//				GWT.log("Error loading workspace folder from server",caught);
-			}
+//			}
-
+//
-			@Override
+//			@Override
-			public void onSuccess(Item result) {
+//			public void onSuccess(Item result) {
-				if(item.getName()==null || item.getName().isEmpty())
+//				if(item.getName()==null || item.getName().isEmpty())
-					item.setName(result.getName());
+//					item.setName(result.getName());
-
+//
-				updateExplorer(result.getChildren());
+//				updateExplorer(result.getChildren());
-
+//
-				setDisplayingFolderItem(result);
+//				setDisplayingFolderItem(result);
-			}
+//			}
-		});
+//		});
-	}
+//	}
 
 	/**
 	 * Load the Workspace Tree.
@@ -465,21 +470,58 @@ public class WorkspaceExplorer implements ShowableTypes, SelectableTypes, Folder
 		itTables.reInitColumnsTable();
 	}
 
-	/*
+
-	 * (non-Javadoc)
+	/* (non-Javadoc)
-	 * @see org.gcube.portlets.widgets.wsexplorer.client.view.FolderLoader#loadFolder(org.gcube.portlets.widgets.wsexplorer.shared.Item, boolean, int, int)
+	 * @see org.gcube.portlets.widgets.wsexplorer.client.view.FolderLoader#loadFolder(org.gcube.portlets.widgets.wsexplorer.shared.Item, boolean, int, int, boolean)
-	 */
+	 * Pagination is not implemented here
-	/**
-	 * This constructor is never used here. Use {@link WorkspaceExplorerPaginated} class if you want paginate the results
-	 *
-	 * @param item the item
-	 * @param loadGcubeProperties the load gcube properties
-	 * @param startIdx the start idx
-	 * @param limit the limit
-	 * @throws Exception the exception
 	 */
 	@Override
-	public void loadFolder(Item item, boolean loadGcubeProperties, int startIdx, int limit) throws Exception {
+	public void loadFolder(
-		this.loadFolder(item, loadGcubeProperties);
+		final Item item, boolean loadGcubeProperties, int startIdx, int limit,
+		boolean resetStore)
+		throws Exception {
+
+		GWT.log("loading folder data");
+		setLoading();
+
+		if(!item.isFolder())
+			throw new Exception("Item is not a folder");
+
+		if(item.getId()==null || item.getId().isEmpty())
+			throw new Exception("Item id is null or empty");
+
+		// we make a copy of showable types
+		List<ItemType> showableTypesParam = new ArrayList<ItemType>(showableTypes);
+
+		// we get sure that folders are displayed
+		for (ItemType folder : Util.FOLDERS) {
+			if (!showableTypesParam.contains(folder))
+				showableTypesParam.add(folder);
+		}
+
+		boolean purgeEmpyFolders = !showEmptyFolders;
+//			FilterCriteria filterCriteria = new FilterCriteria(allowedMimeTypes,requiredProperties, allowedFileExtensions);
+
+		GWT.log("loading workspace folder by item id from server: "+item.getId());
+		WorkspaceExplorerConstants.workspaceNavigatorService.getFolder(item, showableTypesParam, purgeEmpyFolders, filterCriteria, loadGcubeProperties, new AsyncCallback<Item>() {
+
+			@Override
+			public void onFailure(Throwable caught) {
+				Window.alert(caught.getMessage());
+				setAlert(caught.getMessage(), AlertType.ERROR);
+				GWT.log("Error loading workspace folder from server",caught);
+			}
+
+			@Override
+			public void onSuccess(Item result) {
+				if(item.getName()==null || item.getName().isEmpty())
+					item.setName(result.getName());
+
+				updateExplorer(result.getChildren());
+
+				setDisplayingFolderItem(result);
+			}
+		});
+
 	}
 }

src/main/java/org/gcube/portlets/widgets/wsexplorer/client/view/WorkspaceExplorerPaginated.java

@@ -21,10 +21,14 @@ import com.google.gwt.user.cellview.client.SimplePager;
 import com.google.gwt.user.cellview.client.SimplePager.TextLocation;
 import com.google.gwt.user.client.Window;
 import com.google.gwt.user.client.rpc.AsyncCallback;
+import com.google.gwt.user.client.ui.Label;
 import com.google.gwt.user.client.ui.VerticalPanel;
+import com.google.gwt.user.client.ui.Widget;
 import com.google.gwt.view.client.AsyncDataProvider;
 import com.google.gwt.view.client.HasData;
 import com.google.gwt.view.client.Range;
+import com.google.gwt.view.client.SelectionModel;
+import com.google.gwt.view.client.SingleSelectionModel;
 
 
 /**
@@ -37,14 +41,18 @@ public class WorkspaceExplorerPaginated extends WorkspaceExplorer{
 
 	private VerticalPanel vPanel = new VerticalPanel();
 
-	private static WorkspaceExplorerPaginated INSTANCE;
+	private Boolean newLoading = false;
+
+	private Boolean justTest = false;
 
 	//private ListDataProvider<Item> dataProvider = new ListDataProvider<Item>();
 
-	private static MyCustomDataProvider<Item> dataProvider = new MyCustomDataProvider<Item>();
+	private MyCustomDataProvider<Item> dataProvider = new MyCustomDataProvider<Item>();
 
 	protected boolean loadGcubeProperties = false;
 
+	protected Widget orginalLoadingIndicator = null;
+
 	/**
 	 * Instantiates a new workspace explorer paginated.
 	 *
@@ -62,8 +70,10 @@ public class WorkspaceExplorerPaginated extends WorkspaceExplorer{
 		ItemType[] showableTypes, ItemType[] selectableTypes,
 		List<String> displayProperties, boolean showGcubeInfo,
 		DISPLAY_FIELD sortByColumn, DISPLAY_FIELD[] fields) {
-		super(eventBus, filterCriteria, showableTypes, selectableTypes, displayProperties, showGcubeInfo, sortByColumn, dataProvider);
+		super(eventBus, filterCriteria, showableTypes, selectableTypes, displayProperties, showGcubeInfo, sortByColumn);
-		INSTANCE = this;
+		initTable(dataProvider);
+		newLoading = true;
+		orginalLoadingIndicator = getCellTable().getLoadingIndicator();
 	}
 
 
@@ -74,10 +84,8 @@ public class WorkspaceExplorerPaginated extends WorkspaceExplorer{
 	 */
 	public AsyncDataProvider<Item> getAsycnDataProvider(){
 		return (AsyncDataProvider<Item>) getCellTable().getDataProvider();
-		//return new MyCustomDataProvider<Item>();
 	}
 
-
 	/**
 	 * Gets the cell tale.
 	 *
@@ -87,17 +95,13 @@ public class WorkspaceExplorerPaginated extends WorkspaceExplorer{
 		return  getItTables().getCellTable();
 	}
 
-	/**
+
-	 * Load folder.
+	/* (non-Javadoc)
-	 *
+	 * @see org.gcube.portlets.widgets.wsexplorer.client.view.WorkspaceExplorer#loadFolder(org.gcube.portlets.widgets.wsexplorer.shared.Item, boolean, int, int, boolean)
-	 * @param item the item
-	 * @param loadGcubeProperties the load gcube properties
-	 * @param startIdx the start idx
-	 * @param limit the limit
-	 * @throws Exception the exception
 	 */
-	public void loadFolder(final Item item, final boolean loadGcubeProperties, final int startIdx, final int limit) throws Exception {
+	public void loadFolder(final Item item, final boolean loadGcubeProperties, final int startIdx, final int limit, final boolean resetStore) throws Exception {
-		GWT.log("loading folder data");
+		newLoading = resetStore;
+		GWT.log("loading folder data for Item: "+item.getId()+" [startIdx: "+startIdx +", limit: "+limit+", resetStore:"+resetStore+"]");
 		//super.loadFolder(item, loadGcubeProperties);
 		this.loadGcubeProperties = loadGcubeProperties;
 		setLoading();
@@ -118,8 +122,9 @@ public class WorkspaceExplorerPaginated extends WorkspaceExplorer{
 
 		final boolean purgeEmpyFolders = !showEmptyFolders;
 
+		//IF IS INIT OR A DOUBLE CLICK
 		if(getDisplayingFolderItem()==null || getDisplayingFolderItem().getId()!=item.getId()){
-
+			GWT.log("Performing Get Folder Children Count ");
 			WorkspaceExplorerConstants.workspaceNavigatorService.getFolderChildrenCount(item, new AsyncCallback<Integer>() {
 
 				@Override
@@ -127,11 +132,20 @@ public class WorkspaceExplorerPaginated extends WorkspaceExplorer{
 				}
 
 				@Override
-				public void onSuccess(Integer result) {
+				public void onSuccess(final Integer result) {
 					GWT.log("Folder Children count: "+result);
-					getAsycnDataProvider().updateRowCount(result, false);
+
+					int newStartIndex = startIdx;
+					getAsycnDataProvider().updateRowCount(result, true);
+
+					if(newLoading){
+						GWT.log("Cleaning all data...");
+						newStartIndex = 0;
+						GWT.log("Store reset performed start index is: "+newStartIndex);
+					}
+
 					//final Range range = display.getVisibleRange();
-					perfomGetFolderChildren(item, loadGcubeProperties, startIdx, limit, purgeEmpyFolders, showableTypesParam);
+					perfomGetFolderChildren(item, loadGcubeProperties, newStartIndex, limit, purgeEmpyFolders, showableTypesParam);
 				}
 			});
 		}else
@@ -142,6 +156,7 @@ public class WorkspaceExplorerPaginated extends WorkspaceExplorer{
 
 
 
+
 	/**
 	 * Perfom get folder children.
 	 *
@@ -161,21 +176,49 @@ public class WorkspaceExplorerPaginated extends WorkspaceExplorer{
 				Window.alert(caught.getMessage());
 				setAlert(caught.getMessage(), AlertType.ERROR);
 				GWT.log("Error loading workspace folder from server",caught);
+				newLoading = false;
 			}
 
 			@Override
 			public void onSuccess(Item result) {
+
 				if(item.getName()==null || item.getName().isEmpty())
 					item.setName(result.getName());
 
-				GWT.log("Returned "+result.getChildren().size() +" children");
+				//GWT.log("Returned "+result.getChildren().size() +" children");
 				//getItTables().updateItems(result.getChildren(), true);
+
+				if(newLoading){
+					getCellTable().setVisibleRangeAndClearData(new Range(startIdx, WorkspaceExplorerConstants.ITEMS_PER_PAGE), false);
+				}
+
+				SelectionModel<? super Item> sm = getCellTable().getSelectionModel();
+
+				if(sm instanceof SingleSelectionModel){
+					SingleSelectionModel ssm = (SingleSelectionModel) sm;
+					ssm.clear();
+				}
+
 				getAsycnDataProvider().updateRowData(startIdx, result.getChildren());
-				getCellTable().setPageSize(result.getChildren().size()+1);
+
-				//cellList.setVisibleRange(startIdx, result.getChildren().size());
+				if(result.getChildren().size()==0){
-				getCellTable().redraw();
+					getCellTable().setLoadingIndicator(new Label("No data"));
-				GWT.log("cellList size: "+getCellTable().getRowCount());
+				}else{
+					getCellTable().setLoadingIndicator(orginalLoadingIndicator);
+				}
+
+
+				//getCellTable().setVisibleRangeAndClearData(new Range(startIdx, result.getChildren()).), false);
+				//getAsycnDataProvider().getDataDisplays().
+				GWT.log("Updating row data startIndex: "+startIdx + " size: "+result.getChildren().size());
+
+				//getCellTable().setPageSize(result.getChildren().size()+1);
+				//getCellTable().setVisibleRange(startIdx, result.getChildren().size());
+				//getCellTable().redraw();
+				//GWT.log("cellTable size: "+getCellTable().getRowCount());
 				setDisplayingFolderItem(result);
+				newLoading = false;
+
 			}
 		});
 	}
@@ -220,7 +263,7 @@ public class WorkspaceExplorerPaginated extends WorkspaceExplorer{
 	 * Jul 5, 2017
 	 * @param <T> the generic type
 	 */
-	public static class MyCustomDataProvider<T> extends AsyncDataProvider<T> {
+	public class MyCustomDataProvider<T> extends AsyncDataProvider<T> {
 
 		/**
 		 * {@link #onRangeChanged(HasData)} is called when the table requests a
@@ -235,45 +278,24 @@ public class WorkspaceExplorerPaginated extends WorkspaceExplorer{
 			// Get the new range.
 			final Range range = display.getVisibleRange();
 
-			// We are creating fake data. Normally, the data will come
-			// from a
-			// server.
-//			int start = range.getStart();
-//			int length = range.getLength();
-//			List<Item> newData = new ArrayList<Item>();
-//			for (int i = start; i < start + length; i++) {
-//				newData.add(new Item("Item "+i, "Item "+i, false));
-//			}
-//			// Push the data to the displays. AsyncDataProvider will
-//			// only update
-//			// displays that are within range of the data.
-//			updateRowData(start, newData);
-
 			int start = range.getStart();
 			int length = range.getLength();
-			GWT.log("Range changed: "+start +" "+length);
 
-//			try {
+			GWT.log("Range changed: "+start +" "+length + " visible count: "+display.getVisibleItemCount());
-//				GWT.log("qui");
+
-//				INSTANCE.loadFolder(INSTANCE.getItemSelected(), INSTANCE.loadGcubeProperties, start, length);
+			if(newLoading){
-//				GWT.log("qua");
+				GWT.log("OnLoading is true.. returning");
-//			}
+				return;
-//			catch (Exception e) {
+			}
-//				// TODO Auto-generated catch block
+			try {
-//				e.printStackTrace();
+				loadFolder(getDisplayingFolderItem(), loadGcubeProperties, start, length, false);
-//			}
+			}
-//			Item item = new Item(WorkspaceExplorerPaginated.this.getF, folderName, true);
+			catch (Exception e) {
-//			WorkspaceExplorerPaginated.this.loadFolder(WorkspaceExplorerPaginated.this.getItemSelected(), super.get,start, length);
+				// TODO Auto-generated catch block
+				e.printStackTrace();
+			}
 		}
 
-
-		/**
-		 *
-		 */
-		public MyCustomDataProvider() {
-
-			// TODO Auto-generated constructor stub
-		}
 	}
 
 }

src/main/java/org/gcube/portlets/widgets/wsexplorer/client/view/grid/AbstractItemsCellTable.java

@@ -26,10 +26,12 @@ import com.google.gwt.view.client.SelectionChangeEvent;
 import com.google.gwt.view.client.SelectionChangeEvent.Handler;
 import com.google.gwt.view.client.SingleSelectionModel;
 
+
 /**
- * The Class AbstractItemTable.
+ * The Class AbstractItemsCellTable.
  *
- * @author Francesco Mangiacrapa francesco.mangiacrapa@isti.cnr.it Feb 19, 2015
+ * @author Francesco Mangiacrapa francesco.mangiacrapa@isti.cnr.it
+ * Jul 11, 2017
  * @param <T> the generic type
  */
 public abstract class AbstractItemsCellTable<T> {
@@ -39,7 +41,7 @@ public abstract class AbstractItemsCellTable<T> {
 	protected T itemContextMenu = null;
 	protected boolean showMoreInfo;
 	protected SingleSelectionModel<T> ssm;
-	private HandlerManager eventBus;
+	protected HandlerManager eventBus;
 
 
 	/**
@@ -47,8 +49,9 @@ public abstract class AbstractItemsCellTable<T> {
 	 *
 	 * @param pager the pager
 	 * @param pagination the pagination
+	 * @param dataProvider the data provider
 	 */
-	public abstract void initTable(final SimplePager pager, final Pagination pagination);
+	public abstract void initTable(final SimplePager pager, final Pagination pagination, AbstractDataProvider<T> dataProvider);
 
 
 	/**
@@ -59,7 +62,7 @@ public abstract class AbstractItemsCellTable<T> {
 	 * @param dataProvider the data provider
 	 * @param pageSize the page size
 	 */
-	public void initAbstractTable(HandlerManager eventBus, boolean fireOnClick, AbstractDataProvider<T> dataProvider, int pageSize){
+	protected void initAbstractTable(HandlerManager eventBus, boolean fireOnClick, AbstractDataProvider<T> dataProvider, int pageSize){
 		this.eventBus = eventBus;
 		this.showMoreInfo = fireOnClick;
 		sortedCellTable = new SortedCellTable<T>(pageSize, dataProvider);

src/main/java/org/gcube/portlets/widgets/wsexplorer/client/view/grid/ItemsTable.java

@@ -56,7 +56,7 @@ public class ItemsTable<T extends Item> extends AbstractItemsCellTable<T> implem
 	public  DateTimeFormat dtformat = DateTimeFormat.getFormat("dd MMM hh:mm aaa yyyy");
 	public ImageResource info = WorkspaceExplorerResources.ICONS.infoSquare();
 
-	public AbstractDataProvider<T> dataProvider;
+	private AbstractDataProvider<T> dataProvider;
 
 	/**
 	 * The Enum DISPLAY_FIELD.
@@ -82,18 +82,14 @@ public class ItemsTable<T extends Item> extends AbstractItemsCellTable<T> implem
 	 * @param displayProperties the display properties
 	 * @param showGcubeItemsInfo the show gcube items info
 	 * @param startSortByColumn the start sort by column
-	 * @param asyncDataProvider the async data provider
 	 */
-	public ItemsTable(HandlerManager eventBus, boolean showMoreInfo, DISPLAY_FIELD[] fields, List<String> displayProperties, boolean showGcubeItemsInfo, DISPLAY_FIELD startSortByColumn, AbstractDataProvider<T> dataProvider) {
+	public ItemsTable(HandlerManager eventBus, boolean showMoreInfo, DISPLAY_FIELD[] fields, List<String> displayProperties, boolean showGcubeItemsInfo, DISPLAY_FIELD startSortByColumn) {
-		this.dataProvider = dataProvider;
+		this.eventBus = eventBus;
-		initAbstractTable(eventBus, showMoreInfo, dataProvider, WorkspaceExplorerConstants.ITEMS_PER_PAGE);
-		this.dataProvider.addDataDisplay(sortedCellTable);
-		this.startSortByColumn = startSortByColumn;
 		setDisplayFields(fields);
 		setDisplayProperties(displayProperties);
 		setShowGcubeItemsInfo(showGcubeItemsInfo);
-		this.isAsyncronusTable = dataProvider instanceof AbstractDataProvider?true:false;
+		this.startSortByColumn = startSortByColumn;
-		initTable(null, null);
+		//initTable(null, null);
 	}
 
 
@@ -129,7 +125,13 @@ public class ItemsTable<T extends Item> extends AbstractItemsCellTable<T> implem
 	 * @see org.gcube.portlets.admin.gcubereleases.client.view.AbstractPackageTable#initTable(com.google.gwt.user.cellview.client.AbstractCellTable, com.google.gwt.user.cellview.client.SimplePager, com.github.gwtbootstrap.client.ui.Pagination)
 	 */
 	@Override
-	public void initTable(final SimplePager pager, final Pagination pagination) {
+	public void initTable(final SimplePager pager, final Pagination pagination, AbstractDataProvider<T> dataProvider) {
+		this.dataProvider = dataProvider;
+		initAbstractTable(eventBus, showMoreInfo, dataProvider, WorkspaceExplorerConstants.ITEMS_PER_PAGE);
+		this.dataProvider.addDataDisplay(sortedCellTable);
+
+		this.isAsyncronusTable = dataProvider instanceof AbstractDataProvider?true:false;
+
 		sortedCellTable.setEmptyTableWidget(new Label("No data."));
 
 	    if(this.displayFields.contains(DISPLAY_FIELD.ICON)){
@@ -430,7 +432,7 @@ public class ItemsTable<T extends Item> extends AbstractItemsCellTable<T> implem
 		for(int i=0;i<count;i++){
 			sortedCellTable.removeColumn(0);
 		}
-		initTable(null, null);
+		initTable(null, null, dataProvider);
 	}
 
 	/**

src/main/java/org/gcube/portlets/widgets/wsexplorer/shared/Item.java

@@ -50,6 +50,7 @@ public class Item implements IsSerializable, ItemInterface{
 		this.id = id;
 		this.isFolder = isFolder;
 		this.name = name;
+		this.type = isFolder?ItemType.FOLDER:ItemType.UNKNOWN_TYPE;
 	}