code.grnet.gr Git - pithos/blob - web_client/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.core.client.GWT;
  39 import com.google.gwt.core.client.Scheduler;
  40 import com.google.gwt.core.client.Scheduler.ScheduledCommand;
  41 import com.google.gwt.view.client.ListDataProvider;
  42 import com.google.gwt.view.client.SelectionChangeEvent;
  43 import com.google.gwt.view.client.SelectionChangeEvent.Handler;
  44 import com.google.gwt.view.client.SingleSelectionModel;
  45 import com.google.gwt.view.client.TreeViewModel;
  46 import gr.grnet.pithos.web.client.GSS;
  47 import gr.grnet.pithos.web.client.foldertree.FolderTreeView.FolderCell;
  48 import gr.grnet.pithos.web.client.rest.GetRequest;
  49 import gr.grnet.pithos.web.client.rest.RestException;
  50 import java.util.Iterator;
  51 import java.util.Set;
  52
  53 public class FolderTreeViewModel implements TreeViewModel {
  54
  55     private ListDataProvider<Folder> rootDataProvider = new ListDataProvider<Folder>();
  56
  57     private SingleSelectionModel<Folder> selectionModel;
  58
  59     public FolderTreeViewModel(SingleSelectionModel<Folder> selectionModel) {
  60         this.selectionModel = selectionModel;
  61     }
  62
  63     @Override
  64     public <T> NodeInfo<?> getNodeInfo(T value) {
  65         if (value == null) {
  66             Folder f = new Folder("Loading ...");
  67             rootDataProvider.getList().add(f);
  68             return new DefaultNodeInfo<Folder>(rootDataProvider, new FolderCell(), selectionModel, null);
  69         }
  70         else {
  71             final Folder f = (Folder) value;
  72             final ListDataProvider<Folder> dataProvider = new ListDataProvider<Folder>();
  73             dataProvider.flush();
  74             Scheduler.get().scheduleDeferred(new ScheduledCommand() {
  75                 @Override
  76                 public void execute() {
  77                     final GSS app = GSS.get();
  78                     String path = app.getApiPath() + app.getUsername() + "/" + f.getContainer() + "?format=json&delimiter=/&prefix=" + f.getPrefix();
  79                     GetRequest<Folder> getFolder = new GetRequest<Folder>(Folder.class, path, f) {
  80                         @Override
  81                         public void onSuccess(Folder result) {
  82                             Iterator<Folder> iter = result.getSubfolders().iterator();
  83                             fetchFolder(iter, dataProvider, result.getSubfolders());
  84                         }
  85
  86                         @Override
  87                         public void onError(Throwable t) {
  88                             GWT.log("Error getting folder", t);
  89                             if (t instanceof RestException)
  90                                 GSS.get().displayError("Error getting folder: " + ((RestException) t).getHttpStatusText());
  91                             else
  92                                 GSS.get().displayError("System error fetching folder: " + t.getMessage());
  93                         }
  94                     };
  95                     getFolder.setHeader("X-Auth-Token", app.getToken());
  96                     Scheduler.get().scheduleDeferred(getFolder);
  97                 }
  98             });
  99             return new DefaultNodeInfo<Folder>(dataProvider, new FolderCell(), selectionModel, null);
 100         }
 101     }
 102
 103     @Override
 104     public boolean isLeaf(Object o) {
 105         if (o instanceof Folder) {
 106             Folder f = (Folder) o;
 107             return f.getSubfolders().isEmpty();
 108         }
 109         return false;
 110     }
 111
 112     private void fetchFolder(final Iterator<Folder> iter, final ListDataProvider<Folder> dataProvider, final Set<Folder> folders) {
 113         if (iter.hasNext()) {
 114             final Folder f = iter.next();
 115
 116             GSS app = GSS.get();
 117             String path = app.getApiPath() + app.getUsername() + "/" + f.getContainer() + "?format=json&delimiter=/&prefix=" + f.getPrefix();
 118             GetRequest<Folder> getFolder = new GetRequest<Folder>(Folder.class, path, f) {
 119                 @Override
 120                 public void onSuccess(Folder result) {
 121                     fetchFolder(iter, dataProvider, folders);
 122                 }
 123
 124                 @Override
 125                 public void onError(Throwable t) {
 126                     GWT.log("Error getting folder", t);
 127                     if (t instanceof RestException)
 128                         GSS.get().displayError("Error getting folder: " + ((RestException) t).getHttpStatusText());
 129                     else
 130                         GSS.get().displayError("System error fetching folder: " + t.getMessage());
 131                 }
 132             };
 133             getFolder.setHeader("X-Auth-Token", app.getToken());
 134             Scheduler.get().scheduleDeferred(getFolder);
 135         }
 136         else {
 137             dataProvider.getList().clear();
 138             dataProvider.getList().addAll(folders);
 139             if (dataProvider.equals(rootDataProvider))
 140                 selectionModel.setSelected(dataProvider.getList().get(0), true);
 141         }
 142     }
 143
 144     public void initialize(AccountResource account) {
 145         Iterator<Folder> iter = account.getContainers().iterator();
 146         fetchFolder(iter, rootDataProvider, account.getContainers());
 147     }
 148
 149     public Folder getSelection() {
 150         return selectionModel.getSelectedObject();
 151     }
 152 }