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.cell.client.AbstractCell;
   8 import com.google.gwt.cell.client.Cell;
   9 import com.google.gwt.core.client.GWT;
  10 import com.google.gwt.core.client.Scheduler;
  11 import com.google.gwt.core.client.Scheduler.ScheduledCommand;
  12 import com.google.gwt.safehtml.shared.SafeHtmlBuilder;
  13 import com.google.gwt.user.client.ui.AbstractImagePrototype;
  14 import com.google.gwt.view.client.ListDataProvider;
  15 import com.google.gwt.view.client.SelectionChangeEvent;
  16 import com.google.gwt.view.client.SelectionChangeEvent.Handler;
  17 import com.google.gwt.view.client.SingleSelectionModel;
  18 import com.google.gwt.view.client.TreeViewModel;
  19 import gr.grnet.pithos.web.client.GSS;
  20 import gr.grnet.pithos.web.client.foldertree.FolderTreeView.FolderCell;
  21 import gr.grnet.pithos.web.client.rest.GetRequest;
  22 import gr.grnet.pithos.web.client.rest.RestException;
  23 import gr.grnet.pithos.web.client.rest.resource.FolderResource;
  24 import gwtquery.plugins.droppable.client.gwt.DragAndDropNodeInfo;
  25 import java.util.Iterator;
  26 import java.util.List;
  27 import java.util.Set;
  28
  29 public class FolderTreeViewModel implements TreeViewModel {
  30
  31     private SingleSelectionModel<Folder> selectionModel = new SingleSelectionModel<Folder>();
  32
  33     private ListDataProvider<Folder> rootDataProvider = new ListDataProvider<Folder>();
  34
  35     public FolderTreeViewModel() {
  36         Handler selectionHandler = new SelectionChangeEvent.Handler() {
  37             @Override
  38             public void onSelectionChange(SelectionChangeEvent event) {
  39                 NodeInfo<Folder> nodeInfo = (NodeInfo<Folder>) getNodeInfo(selectionModel.getSelectedObject());
  40                 if(nodeInfo == null || nodeInfo.getValueUpdater() == null) {
  41                     //GSS.get().showFileList(selectionModel.getSelectedObject());
  42                 }
  43                 else
  44                     nodeInfo.getValueUpdater().update(selectionModel.getSelectedObject());
  45                 GSS.get().setCurrentSelection(selectionModel.getSelectedObject());
  46             }
  47         };
  48         selectionModel.addSelectionChangeHandler(selectionHandler);
  49     }
  50
  51     @Override
  52     public <T> NodeInfo<?> getNodeInfo(T value) {
  53         if (value == null) {
  54             Folder f = new Folder("Loading ...");
  55             rootDataProvider.getList().add(f);
  56             return new DragAndDropNodeInfo<Folder>(rootDataProvider, new FolderCell(), selectionModel, null);
  57         }
  58         else {
  59             final Folder f = (Folder) value;
  60             final ListDataProvider<Folder> dataProvider = new ListDataProvider<Folder>();
  61             dataProvider.flush();
  62             Scheduler.get().scheduleDeferred(new ScheduledCommand() {
  63                 @Override
  64                 public void execute() {
  65                     final GSS app = GSS.get();
  66                     String path = app.getApiPath() + app.getUsername() + "/" + f.getContainer() + "?format=json&delimiter=/&prefix=" + f.getPrefix();
  67                     GetRequest<Folder> getFolder = new GetRequest<Folder>(Folder.class, path, f) {
  68                         @Override
  69                         public void onSuccess(Folder result) {
  70                             Iterator<Folder> iter = result.getSubfolders().iterator();
  71                             fetchFolder(iter, dataProvider, result.getSubfolders());
  72                         }
  73
  74                         @Override
  75                         public void onError(Throwable t) {
  76                             GWT.log("Error getting folder", t);
  77                             if (t instanceof RestException)
  78                                 GSS.get().displayError("Error getting folder: " + ((RestException) t).getHttpStatusText());
  79                             else
  80                                 GSS.get().displayError("System error fetching folder: " + t.getMessage());
  81                         }
  82                     };
  83                     Scheduler.get().scheduleDeferred(getFolder);
  84                 }
  85             });
  86             return new DragAndDropNodeInfo<Folder>(dataProvider, new FolderCell(), selectionModel, null);
  87         }
  88     }
  89
  90     @Override
  91     public boolean isLeaf(Object o) {
  92         if (o instanceof Folder) {
  93             Folder f = (Folder) o;
  94             return f.getSubfolders().isEmpty();
  95         }
  96         return false;
  97     }
  98
  99     private void fetchFolder(final Iterator<Folder> iter, final ListDataProvider<Folder> dataProvider, final Set<Folder> folders) {
 100         if (iter.hasNext()) {
 101             final Folder f = iter.next();
 102
 103             GSS app = GSS.get();
 104             String path = app.getApiPath() + app.getUsername() + "/" + f.getContainer() + "?format=json&delimiter=/&prefix=" + f.getPrefix();
 105             GetRequest<Folder> getFolder = new GetRequest<Folder>(Folder.class, path, f) {
 106                 @Override
 107                 public void onSuccess(Folder result) {
 108                     fetchFolder(iter, dataProvider, folders);
 109                 }
 110
 111                 @Override
 112                 public void onError(Throwable t) {
 113                     GWT.log("Error getting folder", t);
 114                     if (t instanceof RestException)
 115                         GSS.get().displayError("Error getting folder: " + ((RestException) t).getHttpStatusText());
 116                     else
 117                         GSS.get().displayError("System error fetching folder: " + t.getMessage());
 118                 }
 119             };
 120             Scheduler.get().scheduleDeferred(getFolder);
 121         }
 122         else {
 123             dataProvider.getList().clear();
 124             dataProvider.getList().addAll(folders);
 125         }
 126     }
 127
 128     public void initialize(AccountResource account) {
 129         Iterator<Folder> iter = account.getContainers().iterator();
 130         fetchFolder(iter, rootDataProvider, account.getContainers());
 131     }
 132 }