code.grnet.gr Git - pithos-web-client/blob - src/gr/grnet/pithos/web/client/tagtree/TagTreeViewModel.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.tagtree;
  37
  38 import gr.grnet.pithos.web.client.Pithos;
  39 import gr.grnet.pithos.web.client.foldertree.AccountResource;
  40 import gr.grnet.pithos.web.client.foldertree.File;
  41 import gr.grnet.pithos.web.client.foldertree.Folder;
  42 import gr.grnet.pithos.web.client.rest.GetRequest;
  43 import gr.grnet.pithos.web.client.rest.RestException;
  44 import gr.grnet.pithos.web.client.tagtree.TagTreeView.Templates;
  45
  46 import java.util.Iterator;
  47 import java.util.LinkedHashSet;
  48 import java.util.List;
  49 import java.util.Set;
  50
  51 import com.google.gwt.cell.client.AbstractCell;
  52 import com.google.gwt.cell.client.Cell;
  53 import com.google.gwt.cell.client.TextCell;
  54 import com.google.gwt.core.client.GWT;
  55 import com.google.gwt.core.client.Scheduler;
  56 import com.google.gwt.event.dom.client.ContextMenuEvent;
  57 import com.google.gwt.http.client.Response;
  58 import com.google.gwt.safehtml.shared.SafeHtml;
  59 import com.google.gwt.safehtml.shared.SafeHtmlBuilder;
  60 import com.google.gwt.text.shared.SafeHtmlRenderer;
  61 import com.google.gwt.user.client.ui.AbstractImagePrototype;
  62 import com.google.gwt.view.client.ListDataProvider;
  63 import com.google.gwt.view.client.SingleSelectionModel;
  64 import com.google.gwt.view.client.TreeViewModel;
  65
  66 public class TagTreeViewModel implements TreeViewModel {
  67
  68     private Cell<Tag> tagCell = new AbstractCell<Tag>(ContextMenuEvent.getType().getName()) {
  69
  70        @Override
  71         public void render(Context context, Tag tag, SafeHtmlBuilder safeHtmlBuilder) {
  72             String html = AbstractImagePrototype.create(TagTreeView.images.tag()).getHTML();
  73             safeHtmlBuilder.appendHtmlConstant(html);
  74             safeHtmlBuilder.append(Templates.INSTANCE.nameSpan(tag.getName()));
  75         }
  76
  77         @Override
  78         public void onBrowserEvent(Context context, com.google.gwt.dom.client.Element parent, Tag tag, com.google.gwt.dom.client.NativeEvent event, com.google.gwt.cell.client.ValueUpdater<Tag> valueUpdater) {
  79             if (event.getType().equals(com.google.gwt.event.dom.client.ContextMenuEvent.getType().getName())) {
  80                 TagTreeViewModel.this.selectionModel.setSelected(tag, true);
  81             }
  82         }
  83     };
  84
  85     private ListDataProvider<String> rootDataProvider = new ListDataProvider<String>();
  86     private ListDataProvider<Tag> tagDataProvider = new ListDataProvider<Tag>();
  87
  88     protected SingleSelectionModel<Tag> selectionModel;
  89
  90     protected Pithos app;
  91
  92     public TagTreeViewModel(Pithos _app, SingleSelectionModel<Tag> selectionModel) {
  93         app = _app;
  94         this.selectionModel = selectionModel;
  95     }
  96
  97     @Override
  98     public <T> NodeInfo<?> getNodeInfo(T value) {
  99         if (value == null) {
 100             return new DefaultNodeInfo<String>(rootDataProvider, new TextCell(new SafeHtmlRenderer<String>() {
 101                 @Override
 102                 public SafeHtml render(String object) {
 103                     SafeHtmlBuilder builder = new SafeHtmlBuilder();
 104                     render(object, builder);
 105                     return builder.toSafeHtml();
 106                 }
 107
 108                 @Override
 109                 public void render(String object, SafeHtmlBuilder builder) {
 110                     String html = AbstractImagePrototype.create(TagTreeView.images.tag()).getHTML();
 111                     builder.appendHtmlConstant(html);
 112                     builder.append(Templates.INSTANCE.nameSpan(object));
 113                 }
 114             }), null, null);
 115         }
 116         else if (value instanceof String) {
 117             //fetchAllTags();
 118             return new DefaultNodeInfo<Tag>(tagDataProvider, tagCell, selectionModel, null);
 119         }
 120         else
 121             return null;
 122     }
 123
 124     @Override
 125     public boolean isLeaf(Object o) {
 126         if (o == null)
 127             return false;
 128         if (o instanceof String)
 129             return tagDataProvider.getList().isEmpty();
 130                 return true;
 131     }
 132
 133     public Tag getSelection() {
 134         return selectionModel.getSelectedObject();
 135     }
 136
 137     public void updateTag(Tag tag) {
 138         fetchTag(tag);
 139     }
 140
 141     public void fetchTag(Tag t) {
 142         AccountResource account = app.getAccount();
 143         Iterator<Folder> iter = account.getContainers().iterator();
 144         fetchTag(iter, t, new LinkedHashSet<File>());
 145     }
 146
 147     protected void fetchTag(final Iterator<Folder> iter, final Tag t, final Set<File> files) {
 148         if (iter.hasNext()) {
 149             Folder f = iter.next();
 150             String path = f.getUri() + "?format=json&meta=" + t.getName();
 151             GetRequest<Folder> getFolder = new GetRequest<Folder>(Folder.class, app.getApiPath(), app.getUsername(), path) {
 152                 @Override
 153                 public void onSuccess(Folder _result) {
 154                     files.addAll(_result.getFiles());
 155                     fetchTag(iter, t, files);
 156                 }
 157
 158                 @Override
 159                 public void onError(Throwable th) {
 160                     GWT.log("Error getting folder", th);
 161                                         app.setError(th);
 162                     if (th instanceof RestException)
 163                         app.displayError("Error getting folder: " + ((RestException) th).getHttpStatusText());
 164                     else
 165                         app.displayError("System error fetching folder: " + th.getMessage());
 166                 }
 167
 168                                 @Override
 169                                 protected void onUnauthorized(Response response) {
 170                                         app.sessionExpired();
 171                                 }
 172             };
 173             getFolder.setHeader("X-Auth-Token", app.getToken());
 174             Scheduler.get().scheduleDeferred(getFolder);
 175         }
 176         else {
 177             app.showFiles(files);
 178         }
 179     }
 180
 181     public void initialize(List<Tag> allTags) {
 182         tagDataProvider.getList().addAll(allTags);
 183         rootDataProvider.getList().add("Tags");
 184     }
 185 }