Synnefo » Pithos Web Client

/*

 * Copyright 2011 GRNET S.A. All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or

 * without modification, are permitted provided that the following

 * conditions are met:

 *

 *   1. Redistributions of source code must retain the above

 *      copyright notice, this list of conditions and the following

 *      disclaimer.

 *

 *   2. 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.

 *

 * THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``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 GRNET S.A 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.

 *

 * The views and conclusions contained in the software and

 * documentation are those of the authors and should not be

 * interpreted as representing official policies, either expressed

 * or implied, of GRNET S.A.

 */

package gr.grnet.pithos.web.client;

import static com.google.gwt.query.client.GQuery.$;

import gr.grnet.pithos.web.client.CellTreeView.Images;

import gr.grnet.pithos.web.client.CellTreeView.RefreshHandler;

import gr.grnet.pithos.web.client.rest.GetCommand;

import gr.grnet.pithos.web.client.rest.MultipleGetCommand;

import gr.grnet.pithos.web.client.rest.RestException;

import gr.grnet.pithos.web.client.rest.resource.FileResource;

import gr.grnet.pithos.web.client.rest.resource.FolderResource;

import gr.grnet.pithos.web.client.rest.resource.MyFolderResource;

import gr.grnet.pithos.web.client.rest.resource.OtherUserResource;

import gr.grnet.pithos.web.client.rest.resource.OthersFolderResource;

import gr.grnet.pithos.web.client.rest.resource.OthersResource;

import gr.grnet.pithos.web.client.rest.resource.RestResource;

import gr.grnet.pithos.web.client.rest.resource.RestResourceWrapper;

import gr.grnet.pithos.web.client.rest.resource.SharedFolderResource;

import gr.grnet.pithos.web.client.rest.resource.SharedResource;

import gr.grnet.pithos.web.client.rest.resource.TrashFolderResource;

import gr.grnet.pithos.web.client.rest.resource.TrashResource;

import gwtquery.plugins.draggable.client.DragAndDropManager;

import gwtquery.plugins.draggable.client.DraggableOptions;

import gwtquery.plugins.draggable.client.StopDragException;

import gwtquery.plugins.draggable.client.DraggableOptions.CursorAt;

import gwtquery.plugins.draggable.client.DraggableOptions.DragFunction;

import gwtquery.plugins.draggable.client.DraggableOptions.RevertOption;

import gwtquery.plugins.draggable.client.events.DragContext;

import gwtquery.plugins.droppable.client.DroppableOptions;

import gwtquery.plugins.droppable.client.DroppableOptions.DroppableFunction;

import gwtquery.plugins.droppable.client.events.DragAndDropContext;

import gwtquery.plugins.droppable.client.gwt.DragAndDropNodeInfo;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import com.google.gwt.cell.client.AbstractCell;

import com.google.gwt.cell.client.Cell;

import com.google.gwt.cell.client.ValueUpdater;

import com.google.gwt.core.client.GWT;

import com.google.gwt.dom.client.Style.Cursor;

import com.google.gwt.safehtml.client.SafeHtmlTemplates;

import com.google.gwt.safehtml.shared.SafeHtml;

import com.google.gwt.safehtml.shared.SafeHtmlBuilder;

import com.google.gwt.user.client.DeferredCommand;

import com.google.gwt.user.client.ui.AbstractImagePrototype;

import com.google.gwt.view.client.AsyncDataProvider;

import com.google.gwt.view.client.HasData;

import com.google.gwt.view.client.ListDataProvider;

import com.google.gwt.view.client.ProvidesKey;

import com.google.gwt.view.client.SingleSelectionModel;

import com.google.gwt.view.client.TreeViewModel;

public class CellTreeViewModel implements TreeViewModel{

        private final ListDataProvider<RestResource> rootNodes = new ListDataProvider<RestResource>();

        private Map<String,FolderResource> folderCache=new HashMap<String, FolderResource>();

        final Images images;

        SingleSelectionModel<RestResource> selectionModel;

        Map<String, MyFolderDataProvider> mymap = new HashMap<String, MyFolderDataProvider>();

        Map<String, MyFolderDataProvider> sharedmap = new HashMap<String, MyFolderDataProvider>();

        Map<String, MyFolderDataProvider> othersmap = new HashMap<String, MyFolderDataProvider>();

        static interface Templates extends SafeHtmlTemplates {

            Templates INSTANCE = GWT.create(Templates.class);

            @Template(" <div id='dragHelper' class='{0}'></div>")

            SafeHtml outerHelper(String cssClassName);

          }

        void configureDragOperation(final DraggableOptions options) {

            // set a custom element as drag helper. The content of the helper will be

            // set when the drag will start

            options.setHelper($(Templates.INSTANCE.outerHelper(

                "drag").asString()));

            // opacity of the drag helper

            options.setOpacity((float) 0.9);

            // cursor during the drag operation

            options.setCursor(Cursor.MOVE);

            // the cell being greater than the helper, force the position of the

            // helper on the mouse cursor.

            options.setCursorAt(new CursorAt(10, 10, null, null));

            // append the helper to the body element

            options.setAppendTo("body");

            options.setCancel("select");

            // set the revert option

            options.setRevert(RevertOption.ON_INVALID_DROP);

            options.setOnBeforeDragStart(new DragFunction() {

                        @Override

                        public void f(DragContext context) {

                                 RestResource value = context.getDraggableData();

                             if(!CellTreeViewModel.this.selectionModel.isSelected(value)){

                                       throw new StopDragException();

                              }

                             if(value instanceof TrashResource || value instanceof SharedResource || value instanceof OthersResource || value instanceof OtherUserResource){

                                       throw new StopDragException();

                              }

                        }

                });

            // use a Function to fill the content of the helper

            // we could also add a DragStartEventHandler on the DragAndDropTreeCell and

            // DragAndDropCellList.

            options.setOnDragStart(new DragFunction() {

              public void f(DragContext context) {

                RestResourceWrapper memberInfo = context.getDraggableData();

                context.getHelper().setInnerHTML(memberInfo.getName());

              }

            });

          }

        /**

         * 

         */

        public CellTreeViewModel(final Images _images,SingleSelectionModel<RestResource> selectionModel ) {

                super();

                images=_images;

                this.selectionModel=selectionModel;

        }

        private final Cell<RestResource> departmentCell = new AbstractCell<RestResource>("contextmenu"){

                @Override

                public void render(com.google.gwt.cell.client.Cell.Context arg0, RestResource arg1, SafeHtmlBuilder arg2) {

                        String id = null;

                        String html = null;

                        String name = null;

                        if(arg1 instanceof TrashFolderResource){

                                html = AbstractImagePrototype.create(images.folderYellow()).getHTML();

                                FolderResource res = ((RestResourceWrapper)arg1).getResource();

                                name = res.getName();

                                id = res.getParentName() +"."+name;

                        }

                        else if(arg1 instanceof RestResourceWrapper){

                                FolderResource res = ((RestResourceWrapper)arg1).getResource();

                                if(res.isShared())

                                        html = AbstractImagePrototype.create(images.sharedFolder()).getHTML();

                                else if(res.getParentName()==null){

                                        html = AbstractImagePrototype.create(images.home()).getHTML();

                                }

                                else

                                        html = AbstractImagePrototype.create(images.folderYellow()).getHTML();

                                name = res.getName();

                                if(res.getParentName() != null){                                        

                                        id = res.getParentName()+"."+name;

                                }else{                                        

                                        id = name;

                                }

                        }

                        else if(arg1 instanceof TrashResource){

                                html = AbstractImagePrototype.create(images.trash()).getHTML();

                                name="Trash";

                                id = name;                                

                        }

                        else if(arg1 instanceof SharedResource){

                                html = AbstractImagePrototype.create(images.myShared()).getHTML();

                                name = "My Shared";

                                id = name;

                        }

                        else if(arg1 instanceof OthersResource){

                                html = AbstractImagePrototype.create(images.othersShared()).getHTML();

                                name = "Other's Shared";

                                id = "others";                                

                        }

                        else if(arg1 instanceof OtherUserResource){

                                html = AbstractImagePrototype.create(images.permUser()).getHTML();

                                name = ((OtherUserResource)arg1).getName();

                                id = name;

                        }

                        arg2.appendHtmlConstant(html);

                        arg2.append(FileList.Templates.INSTANCE.spanWithIdAndClass(id, "papala", name));

                }

                public void onBrowserEvent(Cell.Context context, com.google.gwt.dom.client.Element parent, RestResource value, com.google.gwt.dom.client.NativeEvent event, com.google.gwt.cell.client.ValueUpdater<RestResource> valueUpdater) {

                        if(event.getType().equals("contextmenu")){

                                selectionModel.setSelected(value, true);

                                GSS.get().setCurrentSelection(value);

                                GSS.get().getTreeView().showPopup(event.getClientX(), event.getClientY());

                        }

                };

        };

        @Override

        public <T> NodeInfo<?> getNodeInfo(final T value) {

                if(value==null){

                        DragAndDropNodeInfo n = new DragAndDropNodeInfo<RestResource>(getRootNodes(), departmentCell,

                                    selectionModel, null);

                        configureFolderDrop(n);

                configureDragOperation(n.getDraggableOptions());

                        return n;

                }

                else if (value instanceof MyFolderResource) {

                // Second level.

                        MyFolderDataProvider dataProvider = new MyFolderDataProvider(

                    ((MyFolderResource) value),MyFolderResource.class);

                DragAndDropNodeInfo<RestResource> n =  new DragAndDropNodeInfo<RestResource>(dataProvider, departmentCell,

                    selectionModel, new ResourceValueUpdater());

                mymap.put(((MyFolderResource) value).getUri(), dataProvider);

                // permission cell are not draggable

                //n.setCellDroppableOnly();

                configureFolderDrop(n);

                configureDragOperation(n.getDraggableOptions());

                return n;

                }

                else if (value instanceof SharedResource) {

                // Second level.

                        MyFolderDataProvider dataProvider = new MyFolderDataProvider(

                    ((SharedResource) value), SharedFolderResource.class);

                        sharedmap.put(((SharedResource) value).getUri(), dataProvider);

                        DragAndDropNodeInfo<RestResource> n = new DragAndDropNodeInfo<RestResource>(dataProvider, departmentCell,

                    selectionModel, new ResourceValueUpdater());

                         configureFolderDrop(n);

                        configureDragOperation(n.getDraggableOptions());

                        return n;

                }

                else if (value instanceof TrashResource) {

                // Second level.

                        ListDataProvider<RestResource> trashProvider = new ListDataProvider<RestResource>();

                        List<RestResource> r = new ArrayList<RestResource>();

                        for(FolderResource f : GSS.get().getTreeView().getTrash().getFolders()){

                                r.add(new TrashFolderResource(f));

                        }

                        trashProvider.setList(r);

                        DragAndDropNodeInfo<RestResource> n = new DragAndDropNodeInfo<RestResource>(trashProvider, departmentCell,

                    selectionModel, new ResourceValueUpdater());

                        configureFolderDrop(n);

                configureDragOperation(n.getDraggableOptions());

                        return n;

                }

                else if (value instanceof OthersResource) {

                // Second level.

                        OthersDataProvider dataProvider = new OthersDataProvider(

                    ((OthersResource) value), SharedFolderResource.class);

                DragAndDropNodeInfo<RestResource> n = new DragAndDropNodeInfo<RestResource>(dataProvider, departmentCell,

                    selectionModel, null);

                configureFolderDrop(n);

                configureDragOperation(n.getDraggableOptions());

                return n;

                }

                else if (value instanceof SharedFolderResource) {

                // Second level.

                        MyFolderDataProvider dataProvider = new MyFolderDataProvider(

                    ((SharedFolderResource) value),SharedFolderResource.class);

                DragAndDropNodeInfo<RestResource> n =  new DragAndDropNodeInfo<RestResource>(dataProvider, departmentCell,

                    selectionModel, new ResourceValueUpdater());

                sharedmap.put(((SharedFolderResource) value).getUri(), dataProvider);

                configureFolderDrop(n);

                configureDragOperation(n.getDraggableOptions());

                return n;

                }

                else if (value instanceof OthersFolderResource) {

                // Second level.

                        MyFolderDataProvider dataProvider = new MyFolderDataProvider(

                    ((OthersFolderResource) value),OthersFolderResource.class);

                DragAndDropNodeInfo<RestResource> n =  new DragAndDropNodeInfo<RestResource>(dataProvider, departmentCell,

                    selectionModel, new ResourceValueUpdater());

                //nodeInfos.put(((OthersFolderResource) value).getUri(), n);

                othersmap.put(((OthersFolderResource) value).getUri(), dataProvider);

                configureFolderDrop(n);

                configureDragOperation(n.getDraggableOptions());

                return n;

                }

                else if (value instanceof OtherUserResource) {

                // Second level.

                        MyFolderDataProvider dataProvider = new MyFolderDataProvider(

                    ((OtherUserResource) value),OthersFolderResource.class);

                DragAndDropNodeInfo<RestResource> n =  new DragAndDropNodeInfo<RestResource>(dataProvider, departmentCell,

                    selectionModel, new ResourceValueUpdater());

                configureFolderDrop(n);

                configureDragOperation(n.getDraggableOptions());

                return n;

                }

                // TODO Auto-generated method stub

                return null;

        }

        private void configureFolderDrop(DragAndDropNodeInfo<RestResource> n){

                DroppableOptions options = n.getDroppableOptions();

        options.setDroppableHoverClass("droppableHover");

        // use a DroppableFunction here. We can also add a DropHandler in the tree

        // itself

        options.setOnOver(new DroppableFunction() {

                        @Override

                        public void f(final DragAndDropContext context) {

                                if(context.getDroppableData()!=null && context.getDroppableData() instanceof RestResource){

                                        GSS.get().getTreeView().getUtils().openNodeContainingResource((RestResource) context.getDroppableData(), new RefreshHandler() {

                                                @Override

                                                public void onRefresh() {

                                                        DragAndDropManager.getInstance().update(context);//initialize(context, GQueryUi.Event.create(com.google.gwt.user.client.Event.getCurrentEvent()));

                                                }

                                        });

                                }

                        }

                });

        options.setOnDrop(new DroppableFunction() {

          public void f(DragAndDropContext context) {

                  DnDFolderPopupMenu popup ;

                  if(context.getDraggableData() instanceof FileResource){

//                          if(context.getDroppableData() instanceof RestResourceWrapper)

//                                  popup = new DnDFolderPopupMenu(images, ((RestResourceWrapper) context.getDroppableData()).getResource(), Arrays.asList(context.getDraggableData()));

 //                         else

 //                                 popup = new DnDFolderPopupMenu(images, null, Arrays.asList(context.getDraggableData()));

                  }

                  else{

//                          if(context.getDroppableData() instanceof RestResourceWrapper)

//                                  popup = new DnDFolderPopupMenu(images, ((RestResourceWrapper) context.getDroppableData()).getResource(), context.getDraggableData());

//                          else

//                                  popup = new DnDFolderPopupMenu(images, null, context.getDraggableData());

                  }

                  int left = context.getDroppable().getAbsoluteLeft() + 40;

              int top = context.getDroppable().getAbsoluteTop() + 20;

//              popup.setPopupPosition(left, top);

 //                 popup.show();

          }

        });

        }

        @Override

        public boolean isLeaf(Object value) {

                if(value instanceof RestResourceWrapper)

                        return ((RestResourceWrapper)value).getResource().getFolders().size()==0;

                else if(value instanceof TrashResource)

                        return ((TrashResource)value).getFolders().size()==0;

                else if(value instanceof SharedResource)

                        return ((SharedResource)value).getFolders().size()==0;

                else if(value instanceof OthersResource)

                        return ((OthersResource)value).getOtherUsers().size()==0;

                else if(value instanceof OtherUserResource)

                        return ((OtherUserResource)value).getFolders().size()==0;

                return false;

        }

        /**

         * Retrieve the selectionModel.

         *

         * @return the selectionModel

         */

        public SingleSelectionModel<RestResource> getSelectionModel() {

                return selectionModel;

        }

        static interface ClearSelection{

                public void setClearSelection(boolean clearSelection);

        }

        class ResourceValueUpdater implements  ValueUpdater<RestResource>,ClearSelection{

                boolean clearSelection=true;

                /**

                 * Modify the clearSelection.

                 *

                 * @param clearSelection the clearSelection to set

                 */

                public void setClearSelection(boolean clearSelection) {

                        this.clearSelection = clearSelection;

                }

                @Override

                public void update(final RestResource value) {

                        if(value instanceof MyFolderResource){

                                GetCommand<FolderResource> gf = new GetCommand<FolderResource>(FolderResource.class, value.getUri(), null) {

                                        @Override

                                        public void onComplete() {

                                                FolderResource rootResource = getResult();

                                                //((MyFolderResource)value).getResource().setFiles(rootResource.getFiles());

                                                ((MyFolderResource)value).setResource(rootResource);

                                                if(GSS.get().getTreeView().getSelection().getUri().equals(value.getUri()))

                                                        selectionModel.setSelected(value, true);

                                                GSS.get().onResourceUpdate(value,clearSelection);

                                        }

                                        @Override

                                        public void onError(Throwable t) {

                                                GWT.log("Error fetching root folder", t);

                                                GSS.get().displayError("Unable to fetch root folder");

                                        }

                                };

                                DeferredCommand.addCommand(gf);

                        }

                        else if(value instanceof TrashResource){

                                DeferredCommand.addCommand(new GetCommand<TrashResource>(TrashResource.class, GSS.get().getCurrentUserResource().getTrashPath(), null) {

                                        @Override

                                        public void onComplete() {

                                                //trash = getResult();

                                                ((TrashResource)value).setFolders(getResult().getFolders());

                                                ((TrashResource)value).setFiles(getResult().getFiles());

                                                for(RestResource r : getRootNodes().getList()){

                                                        if(r instanceof TrashResource)

                                                                getRootNodes().getList().set(getRootNodes().getList().indexOf(r),GSS.get().getTreeView().getTrash());

                                                }

                                                GSS.get().getTreeView().updateNodeChildren(GSS.get().getTreeView().getTrash());

                                                //GSS.get().showFileList(true);

                                                GSS.get().onResourceUpdate(value,clearSelection);

                                        }

                                        @Override

                                        public void onError(Throwable t) {

                                                if(t instanceof RestException){

                                                        int statusCode = ((RestException)t).getHttpStatusCode();

                                                        // On IE status code 1223 may be returned instead of 204.

                                                        if(statusCode == 204 || statusCode == 1223){

                                                                ((TrashResource)value).setFolders(new ArrayList<FolderResource>());

                                                                ((TrashResource)value).setFiles(new ArrayList<FileResource>());

                                                }

                                                else{

                                                        GWT.log("", t);

                                                        GSS.get().displayError("Unable to fetch trash folder:"+t.getMessage());

                                                        //GSS.get().getTreeView().getTrash() = new TrashResource(GSS.get().getCurrentUserResource().getTrashPath());

                                                }

                                        }

                                }

                                });

                        }

                        else if(value instanceof OthersFolderResource){

                                GetCommand<FolderResource> gf = new GetCommand<FolderResource>(FolderResource.class, value.getUri(), null) {

                                        @Override

                                        public void onComplete() {

                                                FolderResource rootResource = getResult();

                                                //((MyFolderResource)value).getResource().setFiles(rootResource.getFiles());

                                                ((OthersFolderResource)value).setResource(rootResource);

                                                if(GSS.get().getTreeView().getSelection().getUri().equals(value.getUri()))

                                                        selectionModel.setSelected(value, true);

                                                GSS.get().onResourceUpdate(value,clearSelection);

                                        }

                                        @Override

                                        public void onError(Throwable t) {

                                                GWT.log("Error fetching root folder", t);

                                                GSS.get().displayError("Unable to fetch root folder");

                                        }

                                };

                                DeferredCommand.addCommand(gf);

                        }

                        else if(value instanceof SharedFolderResource){

                                GetCommand<FolderResource> gf = new GetCommand<FolderResource>(FolderResource.class, value.getUri(), null) {

                                        @Override

                                        public void onComplete() {

                                                FolderResource rootResource = getResult();

                                                //((MyFolderResource)value).getResource().setFiles(rootResource.getFiles());

                                                ((SharedFolderResource)value).setResource(rootResource);

                                                if(GSS.get().getTreeView().getSelection().getUri().equals(value.getUri()))

                                                        selectionModel.setSelected(value, true);

                                                GSS.get().onResourceUpdate(value,clearSelection);

                                        }

                                        @Override

                                        public void onError(Throwable t) {

                                                GWT.log("Error fetching root folder", t);

                                                GSS.get().displayError("Unable to fetch root folder");

                                        }

                                };

                                DeferredCommand.addCommand(gf);

                        }

                        else if(value instanceof SharedResource){

                                GetCommand<SharedResource> gf = new GetCommand<SharedResource>(SharedResource.class, value.getUri(), null) {

                                        @Override

                                        public void onComplete() {

                                                SharedResource rootResource = getResult();

                                                ((SharedResource)value).setFolders(getResult().getFolders());

                                                ((SharedResource)value).setFiles(getResult().getFiles());

                                                if(GSS.get().getTreeView().getSelection().getUri().equals(value.getUri()))

                                                        selectionModel.setSelected(value, true);

                                                GSS.get().onResourceUpdate(value,clearSelection);

                                        }

                                        @Override

                                        public void onError(Throwable t) {

                                                GWT.log("Error fetching root folder", t);

                                                GSS.get().displayError("Unable to fetch root folder");

                                        }

                                };

                                DeferredCommand.addCommand(gf);

                        }

                        else if(value instanceof OtherUserResource){

                                GetCommand<OtherUserResource> gf = new GetCommand<OtherUserResource>(OtherUserResource.class, value.getUri(), null) {

                                        @Override

                                        public void onComplete() {

                                                OtherUserResource rootResource = getResult();

                                                ((OtherUserResource)value).setFolders(getResult().getFolders());

                                                ((OtherUserResource)value).setFiles(getResult().getFiles());

                                                if(GSS.get().getTreeView().getSelection().getUri().equals(value.getUri()))

                                                        selectionModel.setSelected(value, true);

                                                GSS.get().onResourceUpdate(value,clearSelection);

                                        }

                                        @Override

                                        public void onError(Throwable t) {

                                                GWT.log("Error fetching root folder", t);

                                                GSS.get().displayError("Unable to fetch root folder");

                                        }

                                };

                                DeferredCommand.addCommand(gf);

                        }

                }

        }

        class MyFolderDataProvider extends AsyncDataProvider<RestResource>{

                private RestResource restResource;

                private Class resourceClass;

                  public MyFolderDataProvider(RestResource department, Class resourceClass) {

                    super(new ProvidesKey<RestResource>() {

                                @Override

                                public Object getKey(RestResource item) {

                                        return item.getUri();

                                }});

                    this.restResource = department;

                    this.resourceClass=resourceClass;

                  }

                  @Override

                  protected void onRangeChanged(final HasData<RestResource> view) {

                        refresh(null);

                  }

                /**

                 * Retrieve the restResource.

                 *

                 * @return the restResource

                 */

                public RestResource getRestResource() {

                        return restResource;

                }

                /**

                 * Modify the restResource.

                 *

                 * @param restResource the restResource to set

                 */

                public void setRestResource(RestResource restResource) {

                        this.restResource = restResource;

                }

                List<RestResource> res =null;

                  public void refresh(final RefreshHandler refresh){

                          FolderResource cache = null;

                          if(restResource instanceof RestResourceWrapper && !((RestResourceWrapper)restResource).getResource().isNeedsExpanding())

                                  cache = ((RestResourceWrapper)restResource).getResource();

                          GetCommand<FolderResource> gf = new GetCommand<FolderResource>(FolderResource.class, restResource.getUri(),cache ) {

                                        @Override

                                        public void onComplete() {

                                                if(restResource instanceof RestResourceWrapper){

                                                        ((RestResourceWrapper)restResource).setResource(getResult());//restResource = getResult();

                                                        ((RestResourceWrapper)restResource).getResource().setNeedsExpanding(false);

                                                }

                                                if(usedCachedVersion()&&res!=null){

                                                                updateRowCount(res.size(), true);

                                                                updateRowData(0,res);

                                                        return;

                                                }

                                                String[] folderPaths = null;

                                                if(resourceClass.equals(MyFolderResource.class))

                                                        folderPaths=((MyFolderResource) restResource).getResource().getSubfolderPaths().toArray(new String[] {});

                                                else if(resourceClass.equals(SharedFolderResource.class) && restResource instanceof SharedResource)

                                                        folderPaths=((SharedResource) restResource).getSubfolderPaths().toArray(new String[] {});

                                                else if(resourceClass.equals(SharedFolderResource.class)){

                                                        folderPaths=((SharedFolderResource) restResource).getResource().getSubfolderPaths().toArray(new String[] {});

                                                        GWT.log("------------>"+folderPaths);

                                                }

                                                else if(resourceClass.equals(TrashFolderResource.class))

                                                        folderPaths=((TrashFolderResource) restResource).getResource().getSubfolderPaths().toArray(new String[] {});

                                                else if(resourceClass.equals(OthersFolderResource.class) && restResource instanceof OtherUserResource)

                                                        folderPaths=((OtherUserResource) restResource).getSubfolderPaths().toArray(new String[] {});

                                                else if(resourceClass.equals(OthersFolderResource.class))

                                                        folderPaths=((OthersFolderResource) restResource).getResource().getSubfolderPaths().toArray(new String[] {});

                                                MultipleGetCommand.Cached[] cached = null;

                                                if(restResource instanceof RestResourceWrapper)

                                                        cached=((RestResourceWrapper)restResource).getResource().getCache();

                                                MultipleGetCommand<FolderResource> gf2 = new MultipleGetCommand<FolderResource>(FolderResource.class,

                                                                        folderPaths, cached) {

                                                        @Override

                                                        public void onComplete() {

                                                                res = new ArrayList<RestResource>();

                                                                for(FolderResource r : getResult()){

                                                                        if(r.isDeleted()){

                                                                        }

                                                                        else if(resourceClass.equals(MyFolderResource.class))

                                                                                res.add(new MyFolderResource(r));

                                                                        else if(resourceClass.equals(SharedFolderResource.class)){

                                                                                res.add(new SharedFolderResource(r));

                                                                        }

                                                                        else if(resourceClass.equals(TrashFolderResource.class))

                                                                                res.add(new TrashFolderResource(r));

                                                                        else if(resourceClass.equals(OthersFolderResource.class))

                                                                                res.add(new OthersFolderResource(r));

                                                                }

                                                                if(restResource instanceof RestResourceWrapper)

                                                                        ((RestResourceWrapper)restResource).getResource().setFolders(getResult());

                                                                updateRowCount(res.size(), true);

                                                                updateRowData(0,res);

                                                                if(refresh!=null)

                                                                        refresh.onRefresh();

                                                        }

                                                        @Override

                                                        public void onError(Throwable t) {

                                                                GSS.get().displayError("Unable to fetch subfolders");

                                                                GWT.log("Unable to fetch subfolders", t);

                                                        }

                                                        @Override

                                                        public void onError(String p, Throwable throwable) {

                                                                GWT.log("Path:"+p, throwable);

                                                        }

                                                };

                                                DeferredCommand.addCommand(gf2);

                                        }

                                        @Override

                                        public void onError(Throwable t) {

                                                GWT.log("Error fetching root folder", t);

                                                GSS.get().displayError("Unable to fetch root folder");

                                        }

                                };

                                DeferredCommand.addCommand(gf);

                  }                  

        }

        class OthersDataProvider extends AsyncDataProvider<RestResource>{

                private RestResource restResource;

                private Class resourceClass;

                  public OthersDataProvider(RestResource department, Class resourceClass) {

                    super(new ProvidesKey<RestResource>() {

                                @Override

                                public Object getKey(RestResource item) {

                                        return item.getUri();

                                }});

                    this.restResource = department;

                    this.resourceClass=resourceClass;

                  }

                  @Override

                  protected void onRangeChanged(final HasData<RestResource> view) {

                        refresh(null);

                  }

                /**

                 * Retrieve the restResource.

                 *

                 * @return the restResource

                 */

                public RestResource getRestResource() {

                        return restResource;

                }

                /**

                 * Modify the restResource.

                 *

                 * @param restResource the restResource to set

                 */

                public void setRestResource(RestResource restResource) {

                        this.restResource = restResource;

                }

                  public void refresh(final RefreshHandler refresh){

                          GetCommand<OthersResource> go = new GetCommand<OthersResource>(OthersResource.class,

                          restResource.getUri(), null) {

                                  @Override

                                  public void onComplete() {

                                          final OthersResource others = getResult();

                          MultipleGetCommand<OtherUserResource> gogo = new MultipleGetCommand<OtherUserResource>(OtherUserResource.class,

                                                  others.getOthers().toArray(new String[] {}), null) {

                                  @Override

                                  public void onComplete() {

                                          List<OtherUserResource> res = getResult();

                                          updateRowCount(res.size(), true);

                                          List<RestResource> r = new ArrayList<RestResource>();

                                          r.addAll(res);

                                                                            updateRowData(0,r);

                                  }

                                  @Override

                                  public void onError(Throwable t) {

                                          GWT.log("Error fetching Others Root folder", t);

                                          GSS.get().displayError("Unable to fetch Others Root folder");

                                  }

                                  @Override

                                  public void onError(String p, Throwable throwable) {

                                          GWT.log("Path:"+p, throwable);

                                  }

                          };

                          DeferredCommand.addCommand(gogo);

                                  }

                                  @Override

                                  public void onError(Throwable t) {

                                          GWT.log("Error fetching Others Root folder", t);

                                          GSS.get().displayError("Unable to fetch Others Root folder");

                                  }

                          };

                          DeferredCommand.addCommand(go);

                  }                  

        }

        /**

         * Retrieve the rootNodes.

         *

         * @return the rootNodes

         */

        public ListDataProvider<RestResource> getRootNodes() {

                return rootNodes;

        }

        /**

         * Retrieve the mymap.

         *

         * @return the mymap

         */

        public Map<String, MyFolderDataProvider> getMymap() {

                return mymap;

        }

        /**

         * Retrieve the sharedmap.

         *

         * @return the sharedmap

         */

        public Map<String, MyFolderDataProvider> getSharedmap() {

                return sharedmap;

        }

        /**

         * Retrieve the othersmap.

         *

         * @return the othersmap

         */

        public Map<String, MyFolderDataProvider> getOthersmap() {

                return othersmap;

        }

}