Synnefo » Pithos

/*

 * Copyright 2011 GRNET S.A. All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or

 * without modification, are permitted provided that the following

 * conditions are met:

 *

 *   1. Redistributions of source code must retain the above

 *      copyright notice, this list of conditions and the following

 *      disclaimer.

 *

 *   2. Redistributions in binary form must reproduce the above

 *      copyright notice, this list of conditions and the following

 *      disclaimer in the documentation and/or other materials

 *      provided with the distribution.

 *

 * THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS

 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR

 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF

 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED

 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN

 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

 * POSSIBILITY OF SUCH DAMAGE.

 *

 * The views and conclusions contained in the software and

 * documentation are those of the authors and should not be

 * interpreted as representing official policies, either expressed

 * or implied, of GRNET S.A.

 */

package gr.grnet.pithos.web.client.foldertree;

import com.google.gwt.cell.client.AbstractCell;

import com.google.gwt.cell.client.Cell;

import com.google.gwt.core.client.GWT;

import com.google.gwt.core.client.Scheduler;

import com.google.gwt.core.client.Scheduler.ScheduledCommand;

import com.google.gwt.event.dom.client.ContextMenuEvent;

import com.google.gwt.safehtml.shared.SafeHtmlBuilder;

import com.google.gwt.user.client.ui.AbstractImagePrototype;

import com.google.gwt.view.client.ListDataProvider;

import com.google.gwt.view.client.SingleSelectionModel;

import com.google.gwt.view.client.TreeViewModel;

import gr.grnet.pithos.web.client.FolderContextMenu;

import gr.grnet.pithos.web.client.GSS;

import gr.grnet.pithos.web.client.foldertree.FolderTreeView.Templates;

import gr.grnet.pithos.web.client.rest.GetRequest;

import gr.grnet.pithos.web.client.rest.RestException;

import java.util.HashMap;

import java.util.Iterator;

import java.util.Map;

import java.util.Set;

public class FolderTreeViewModel implements TreeViewModel {

    private Cell<Folder> folderCell = new AbstractCell<Folder>(ContextMenuEvent.getType().getName()) {

       @Override

        public void render(Context context, Folder folder, SafeHtmlBuilder safeHtmlBuilder) {

            String html;

            if (folder.isTrash())

                html = AbstractImagePrototype.create(FolderTreeView.images.emptyTrash()).getHTML();

            else

                html = AbstractImagePrototype.create(FolderTreeView.images.folderYellow()).getHTML();

            safeHtmlBuilder.appendHtmlConstant(html);

            safeHtmlBuilder.append(Templates.INSTANCE.nameSpan(folder.getName()));

        }

        @Override

        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) {

            if (event.getType().equals(ContextMenuEvent.getType().getName())) {

                FolderTreeViewModel.this.selectionModel.setSelected(folder, true);

                FolderContextMenu menu = new FolderContextMenu(FolderTreeView.images, folder);

                menu.setPopupPosition(event.getClientX(), event.getClientY());

                menu.show();

            }

        }

    };

    private ListDataProvider<Folder> rootDataProvider = new ListDataProvider<Folder>();

    private Map<Folder, ListDataProvider<Folder>> dataProviderMap = new HashMap<Folder, ListDataProvider<Folder>>();

    private SingleSelectionModel<Folder> selectionModel;

    public FolderTreeViewModel(SingleSelectionModel<Folder> selectionModel) {

        this.selectionModel = selectionModel;

    }

    @Override

    public <T> NodeInfo<?> getNodeInfo(T value) {

        if (value == null) {

            Folder f = new Folder("Loading ...");

            rootDataProvider.getList().add(f);

            return new DefaultNodeInfo<Folder>(rootDataProvider, folderCell, selectionModel, null);

        }

        else {

            final Folder f = (Folder) value;

            if (dataProviderMap.get(f) == null) {

                dataProviderMap.put(f, new ListDataProvider<Folder>());

            }

            final ListDataProvider<Folder> dataProvider = dataProviderMap.get(f);

            fetchFolder(f, dataProvider);

            return new DefaultNodeInfo<Folder>(dataProvider, folderCell, selectionModel, null);

        }

    }

    @Override

    public boolean isLeaf(Object o) {

        if (o instanceof Folder) {

            Folder f = (Folder) o;

            return f.getSubfolders().isEmpty();

        }

        return false;

    }

    private void fetchFolder(final Iterator<Folder> iter, final ListDataProvider<Folder> dataProvider, final Set<Folder> folders) {

        final GSS app = GSS.get();

        if (iter.hasNext()) {

            final Folder f = iter.next();

            String path = app.getApiPath() + app.getUsername() + "/" + f.getContainer() + "?format=json&delimiter=/&prefix=" + f.getPrefix();

            GetRequest<Folder> getFolder = new GetRequest<Folder>(Folder.class, path, f) {

                @Override

                public void onSuccess(Folder result) {

                    fetchFolder(iter, dataProvider, folders);

                }

                @Override

                public void onError(Throwable t) {

                    GWT.log("Error getting folder", t);

                    if (t instanceof RestException)

                        GSS.get().displayError("Error getting folder: " + ((RestException) t).getHttpStatusText());

                    else

                        GSS.get().displayError("System error fetching folder: " + t.getMessage());

                }

            };

            getFolder.setHeader("X-Auth-Token", app.getToken());

            Scheduler.get().scheduleDeferred(getFolder);

        }

        else {

            dataProvider.getList().clear();

            dataProvider.getList().addAll(folders);

            if (dataProvider.equals(rootDataProvider)) {

                selectionModel.setSelected(dataProvider.getList().get(0), true);

                Folder f = new Folder("Trash");

                f.setTrash(true);

                f.setContainer("trash");

                dataProvider.getList().add(f);

            }

        }

    }

    public void initialize(AccountResource account) {

        Iterator<Folder> iter = account.getContainers().iterator();

        fetchFolder(iter, rootDataProvider, account.getContainers());

    }

    public Folder getSelection() {

        return selectionModel.getSelectedObject();

    }

    public void updateFolder(Folder folder) {

        if (dataProviderMap.get(folder) == null) {

            dataProviderMap.put(folder, new ListDataProvider<Folder>());

        }

        final ListDataProvider<Folder> dataProvider = dataProviderMap.get(folder);

        if (!folder.isTrash())

            fetchFolder(folder, dataProvider);

        else

            GSS.get().showFiles(folder);

    }

    public void fetchFolder(final Folder f, final ListDataProvider<Folder> dataProvider) {

        dataProvider.flush();

        Scheduler.get().scheduleDeferred(new ScheduledCommand() {

            @Override

            public void execute() {

                final GSS app = GSS.get();

                String path = app.getApiPath() + app.getUsername() + "/" + f.getContainer() + "?format=json&delimiter=/&prefix=" + f.getPrefix();

                GetRequest<Folder> getFolder = new GetRequest<Folder>(Folder.class, path, f) {

                    @Override

                    public void onSuccess(Folder result) {

                        app.showFiles(result);

                        Iterator<Folder> iter = result.getSubfolders().iterator();

                        fetchFolder(iter, dataProvider, result.getSubfolders());

                    }

                    @Override

                    public void onError(Throwable t) {

                        GWT.log("Error getting folder", t);

                        if (t instanceof RestException)

                            GSS.get().displayError("Error getting folder: " + ((RestException) t).getHttpStatusText());

                        else

                            GSS.get().displayError("System error fetching folder: " + t.getMessage());

                    }

                };

                getFolder.setHeader("X-Auth-Token", app.getToken());

                Scheduler.get().scheduleDeferred(getFolder);

            }

        });

    }

}