code.grnet.gr Git - pithos-web-client/blob - src/gr/grnet/pithos/web/client/foldertree/FolderTreeViewModel.java

   1 /*
   2  * Copyright 2011 GRNET S.A. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or
   5  * without modification, are permitted provided that the following
   6  * conditions are met:
   7  *
   8  *   1. Redistributions of source code must retain the above
   9  *      copyright notice, this list of conditions and the following
  10  *      disclaimer.
  11  *
  12  *   2. Redistributions in binary form must reproduce the above
  13  *      copyright notice, this list of conditions and the following
  14  *      disclaimer in the documentation and/or other materials
  15  *      provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
  18  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  19  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  20  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
  21  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  22  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  23  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  24  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  25  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  27  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  28  * POSSIBILITY OF SUCH DAMAGE.
  29  *
  30  * The views and conclusions contained in the software and
  31  * documentation are those of the authors and should not be
  32  * interpreted as representing official policies, either expressed
  33  * or implied, of GRNET S.A.
  34  */
  35
  36 package gr.grnet.pithos.web.client.foldertree;
  37
  38 import com.google.gwt.cell.client.AbstractCell;
  39 import com.google.gwt.cell.client.Cell;
  40 import com.google.gwt.cell.client.ValueUpdater;
  41 import com.google.gwt.core.client.GWT;
  42 import com.google.gwt.core.client.Scheduler;
  43 import com.google.gwt.core.client.Scheduler.ScheduledCommand;
  44 import com.google.gwt.event.dom.client.ContextMenuEvent;
  45 import com.google.gwt.safehtml.shared.SafeHtmlBuilder;
  46 import com.google.gwt.user.client.Command;
  47 import com.google.gwt.user.client.ui.AbstractImagePrototype;
  48 import com.google.gwt.view.client.CellPreviewEvent;
  49 import com.google.gwt.view.client.CellPreviewEvent.Handler;
  50 import com.google.gwt.view.client.ListDataProvider;
  51 import com.google.gwt.view.client.ProvidesKey;
  52 import com.google.gwt.view.client.SingleSelectionModel;
  53 import com.google.gwt.view.client.TreeViewModel;
  54 import gr.grnet.pithos.web.client.FolderContextMenu;
  55 import gr.grnet.pithos.web.client.Pithos;
  56 import gr.grnet.pithos.web.client.foldertree.FolderTreeView.Templates;
  57 import gr.grnet.pithos.web.client.rest.GetRequest;
  58 import gr.grnet.pithos.web.client.rest.RestException;
  59 import java.util.HashMap;
  60 import java.util.Iterator;
  61 import java.util.Map;
  62 import java.util.Set;
  63
  64 public class FolderTreeViewModel implements TreeViewModel {
  65
  66     private Pithos app;
  67
  68     private Cell<Folder> folderCell = new AbstractCell<Folder>(ContextMenuEvent.getType().getName()) {
  69
  70        @Override
  71         public void render(Context context, Folder folder, SafeHtmlBuilder safeHtmlBuilder) {
  72             String html;
  73             if (folder.isTrash())
  74                 html = AbstractImagePrototype.create(FolderTreeView.images.emptyTrash()).getHTML();
  75             else
  76                 html = AbstractImagePrototype.create(FolderTreeView.images.folderYellow()).getHTML();
  77             safeHtmlBuilder.appendHtmlConstant(html);
  78             safeHtmlBuilder.append(Templates.INSTANCE.nameSpan(folder.getName()));
  79         }
  80
  81         @Override
  82         public void onBrowserEvent(Cell.Context context, com.google.gwt.dom.client.Element parent, Folder folder, com.google.gwt.dom.client.NativeEvent event, com.google.gwt.cell.client.ValueUpdater<Folder> valueUpdater) {
  83             if (event.getType().equals(ContextMenuEvent.getType().getName())) {
  84                 FolderTreeViewModel.this.selectionModel.setSelected(folder, true);
  85                 if (!folder.isTrash()) {
  86                     FolderContextMenu menu = new FolderContextMenu(app, FolderTreeView.images, folder);
  87                     menu.setPopupPosition(event.getClientX(), event.getClientY());
  88                     menu.show();
  89                 }
  90             }
  91         }
  92     };
  93
  94     private ListDataProvider<Folder> rootDataProvider = new ListDataProvider<Folder>();
  95
  96     private Map<Folder, ListDataProvider<Folder>> dataProviderMap = new HashMap<Folder, ListDataProvider<Folder>>();
  97
  98     private SingleSelectionModel<Folder> selectionModel;
  99
 100     public FolderTreeViewModel(Pithos _app, SingleSelectionModel<Folder> selectionModel) {
 101         app = _app;
 102         this.selectionModel = selectionModel;
 103     }
 104
 105     @Override
 106     public <T> NodeInfo<?> getNodeInfo(T value) {
 107         if (value == null) {
 108             Folder f = new Folder("Loading ...");
 109             rootDataProvider.getList().add(f);
 110             return new DefaultNodeInfo<Folder>(rootDataProvider, folderCell, selectionModel, null);
 111         }
 112         else {
 113             final Folder f = (Folder) value;
 114             if (dataProviderMap.get(f) == null) {
 115                 dataProviderMap.put(f, new ListDataProvider<Folder>(new ProvidesKey<Folder>() {
 116                     @Override
 117                     public Object getKey(Folder item) {
 118                         return item;
 119                     }
 120                 }));
 121             }
 122             final ListDataProvider<Folder> dataProvider = dataProviderMap.get(f);
 123             fetchFolder(f, dataProvider, false);
 124             return new DefaultNodeInfo<Folder>(dataProvider, folderCell, selectionModel, null);
 125         }
 126     }
 127
 128     @Override
 129     public boolean isLeaf(Object o) {
 130         if (o instanceof Folder) {
 131             Folder f = (Folder) o;
 132             return f.getSubfolders().isEmpty();
 133         }
 134         return false;
 135     }
 136
 137     private void fetchFolder(final Iterator<Folder> iter, final Command callback) {
 138         if (iter.hasNext()) {
 139             final Folder f = iter.next();
 140
 141             String path = "/" + f.getContainer() + "?format=json&delimiter=/&prefix=" + f.getPrefix();
 142             GetRequest<Folder> getFolder = new GetRequest<Folder>(Folder.class, app.getApiPath(), app.getUsername(), path, f) {
 143                 @Override
 144                 public void onSuccess(Folder result) {
 145                     fetchFolder(iter, callback);
 146                 }
 147
 148                 @Override
 149                 public void onError(Throwable t) {
 150                     GWT.log("Error getting folder", t);
 151                     if (t instanceof RestException)
 152                         app.displayError("Error getting folder: " + ((RestException) t).getHttpStatusText());
 153                     else
 154                         app.displayError("System error fetching folder: " + t.getMessage());
 155                 }
 156             };
 157             getFolder.setHeader("X-Auth-Token", app.getToken());
 158             Scheduler.get().scheduleDeferred(getFolder);
 159         }
 160         else if (callback != null)
 161             callback.execute();
 162     }
 163
 164     public void initialize(final AccountResource account) {
 165         Iterator<Folder> iter = account.getContainers().iterator();
 166         fetchFolder(iter, new Command() {
 167             @Override
 168             public void execute() {
 169                 rootDataProvider.getList().clear();
 170                 rootDataProvider.getList().addAll(account.getContainers());
 171                 selectionModel.setSelected(rootDataProvider.getList().get(0), true);
 172                 Folder f = new Folder("Trash");
 173                 f.setTrash(true);
 174                 f.setContainer("trash");
 175                 rootDataProvider.getList().add(f);
 176                 app.updateTags();
 177             }
 178         });
 179     }
 180
 181     public Folder getSelection() {
 182         return selectionModel.getSelectedObject();
 183     }
 184
 185     public void updateFolder(Folder folder, boolean showfiles) {
 186         if (dataProviderMap.get(folder) == null) {
 187             dataProviderMap.put(folder, new ListDataProvider<Folder>());
 188         }
 189         final ListDataProvider<Folder> dataProvider = dataProviderMap.get(folder);
 190         if (!folder.isTrash())
 191             fetchFolder(folder, dataProvider, showfiles);
 192         else
 193             app.showFiles(folder);
 194     }
 195
 196     public void fetchFolder(final Folder f, final ListDataProvider<Folder> dataProvider, final boolean showfiles) {
 197         Scheduler.get().scheduleDeferred(new ScheduledCommand() {
 198             @Override
 199             public void execute() {
 200                 String path = "/" + f.getContainer() + "?format=json&delimiter=/&prefix=" + f.getPrefix();
 201                 GetRequest<Folder> getFolder = new GetRequest<Folder>(Folder.class, app.getApiPath(), app.getUsername(), path, f) {
 202                     @Override
 203                     public void onSuccess(final Folder result) {
 204                         if (showfiles)
 205                             app.showFiles(result);
 206                         Iterator<Folder> iter = result.getSubfolders().iterator();
 207                         fetchFolder(iter, new Command() {
 208                             @Override
 209                             public void execute() {
 210                                 dataProvider.getList().clear();
 211                                 dataProvider.getList().addAll(result.getSubfolders());
 212                                 app.getFolderTreeView().updateChildren(f);
 213                             }
 214                         });
 215                     }
 216
 217                     @Override
 218                     public void onError(Throwable t) {
 219                         GWT.log("Error getting folder", t);
 220                         if (t instanceof RestException)
 221                             app.displayError("Error getting folder: " + ((RestException) t).getHttpStatusText());
 222                         else
 223                             app.displayError("System error fetching folder: " + t.getMessage());
 224                     }
 225                 };
 226                 getFolder.setHeader("X-Auth-Token", app.getToken());
 227                 Scheduler.get().scheduleDeferred(getFolder);
 228             }
 229         });
 230     }
 231 }