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

   1 /*
   2  * Copyright (c) 2011 Greek Research and Technology Network
   3  */
   4
   5 package gr.grnet.pithos.web.client.foldertree;
   6
   7 import com.google.gwt.core.client.GWT;
   8 import com.google.gwt.core.client.Scheduler;
   9 import com.google.gwt.core.client.Scheduler.ScheduledCommand;
  10 import com.google.gwt.view.client.ListDataProvider;
  11 import com.google.gwt.view.client.SelectionChangeEvent;
  12 import com.google.gwt.view.client.SelectionChangeEvent.Handler;
  13 import com.google.gwt.view.client.SingleSelectionModel;
  14 import com.google.gwt.view.client.TreeViewModel;
  15 import gr.grnet.pithos.web.client.GSS;
  16 import gr.grnet.pithos.web.client.foldertree.FolderTreeView.FolderCell;
  17 import gr.grnet.pithos.web.client.rest.GetRequest;
  18 import gr.grnet.pithos.web.client.rest.RestException;
  19 import java.util.Iterator;
  20 import java.util.Set;
  21
  22 public class FolderTreeViewModel implements TreeViewModel {
  23
  24     private SingleSelectionModel<Folder> selectionModel = new SingleSelectionModel<Folder>();
  25
  26     private ListDataProvider<Folder> rootDataProvider = new ListDataProvider<Folder>();
  27
  28     public FolderTreeViewModel() {
  29         Handler selectionHandler = new SelectionChangeEvent.Handler() {
  30             @Override
  31             public void onSelectionChange(SelectionChangeEvent event) {
  32                 NodeInfo<Folder> nodeInfo = (NodeInfo<Folder>) getNodeInfo(selectionModel.getSelectedObject());
  33                 if(nodeInfo == null || nodeInfo.getValueUpdater() == null) {
  34 //                    GSS.get().showFileList(selectionModel.getSelectedObject());
  35                 }
  36                 else
  37                     nodeInfo.getValueUpdater().update(selectionModel.getSelectedObject());
  38                 GSS.get().setCurrentSelection(selectionModel.getSelectedObject());
  39             }
  40         };
  41         selectionModel.addSelectionChangeHandler(selectionHandler);
  42     }
  43
  44     @Override
  45     public <T> NodeInfo<?> getNodeInfo(T value) {
  46         if (value == null) {
  47             Folder f = new Folder("Loading ...");
  48             rootDataProvider.getList().add(f);
  49             return new DefaultNodeInfo<Folder>(rootDataProvider, new FolderCell(), selectionModel, null);
  50         }
  51         else {
  52             final Folder f = (Folder) value;
  53             final ListDataProvider<Folder> dataProvider = new ListDataProvider<Folder>();
  54             dataProvider.flush();
  55             Scheduler.get().scheduleDeferred(new ScheduledCommand() {
  56                 @Override
  57                 public void execute() {
  58                     final GSS app = GSS.get();
  59                     String path = app.getApiPath() + app.getUsername() + "/" + f.getContainer() + "?format=json&delimiter=/&prefix=" + f.getPrefix();
  60                     GetRequest<Folder> getFolder = new GetRequest<Folder>(Folder.class, path, f) {
  61                         @Override
  62                         public void onSuccess(Folder result) {
  63                             Iterator<Folder> iter = result.getSubfolders().iterator();
  64                             fetchFolder(iter, dataProvider, result.getSubfolders());
  65                         }
  66
  67                         @Override
  68                         public void onError(Throwable t) {
  69                             GWT.log("Error getting folder", t);
  70                             if (t instanceof RestException)
  71                                 GSS.get().displayError("Error getting folder: " + ((RestException) t).getHttpStatusText());
  72                             else
  73                                 GSS.get().displayError("System error fetching folder: " + t.getMessage());
  74                         }
  75                     };
  76                     Scheduler.get().scheduleDeferred(getFolder);
  77                 }
  78             });
  79             return new DefaultNodeInfo<Folder>(dataProvider, new FolderCell(), selectionModel, null);
  80         }
  81     }
  82
  83     @Override
  84     public boolean isLeaf(Object o) {
  85         if (o instanceof Folder) {
  86             Folder f = (Folder) o;
  87             return f.getSubfolders().isEmpty();
  88         }
  89         return false;
  90     }
  91
  92     private void fetchFolder(final Iterator<Folder> iter, final ListDataProvider<Folder> dataProvider, final Set<Folder> folders) {
  93         if (iter.hasNext()) {
  94             final Folder f = iter.next();
  95
  96             GSS app = GSS.get();
  97             String path = app.getApiPath() + app.getUsername() + "/" + f.getContainer() + "?format=json&delimiter=/&prefix=" + f.getPrefix();
  98             GetRequest<Folder> getFolder = new GetRequest<Folder>(Folder.class, path, f) {
  99                 @Override
 100                 public void onSuccess(Folder result) {
 101                     fetchFolder(iter, dataProvider, folders);
 102                 }
 103
 104                 @Override
 105                 public void onError(Throwable t) {
 106                     GWT.log("Error getting folder", t);
 107                     if (t instanceof RestException)
 108                         GSS.get().displayError("Error getting folder: " + ((RestException) t).getHttpStatusText());
 109                     else
 110                         GSS.get().displayError("System error fetching folder: " + t.getMessage());
 111                 }
 112             };
 113             Scheduler.get().scheduleDeferred(getFolder);
 114         }
 115         else {
 116             dataProvider.getList().clear();
 117             dataProvider.getList().addAll(folders);
 118         }
 119     }
 120
 121     public void initialize(AccountResource account) {
 122         Iterator<Folder> iter = account.getContainers().iterator();
 123         fetchFolder(iter, rootDataProvider, account.getContainers());
 124     }
 125 }