Synnefo » Pithos Web Client

/*

 * 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.mysharedtree;

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

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

import gr.grnet.pithos.web.client.foldertree.File;

import gr.grnet.pithos.web.client.foldertree.Folder;

import gr.grnet.pithos.web.client.mysharedtree.MysharedTreeView.Templates;

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

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

import java.util.HashMap;

import java.util.HashSet;

import java.util.Iterator;

import java.util.List;

import java.util.Map;

import java.util.Set;

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

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

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

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

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

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

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

import com.google.gwt.http.client.Response;

import com.google.gwt.http.client.URL;

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

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

import com.google.gwt.text.shared.SafeHtmlRenderer;

import com.google.gwt.user.client.Command;

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

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

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

import com.google.gwt.view.client.SelectionChangeEvent.Handler;

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

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

public class MysharedTreeViewModel implements TreeViewModel {

    protected Pithos app;

    private Cell<Folder> folderCell = new AbstractCell<Folder>() {

       @Override

        public void render(@SuppressWarnings("unused") Context context, Folder folder, SafeHtmlBuilder safeHtmlBuilder) {

            String html = AbstractImagePrototype.create(MysharedTreeView.images.folderYellow()).getHTML();

            safeHtmlBuilder.appendHtmlConstant(html).appendHtmlConstant(" ");

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

        }

        @Override

        public void onBrowserEvent(@SuppressWarnings("unused") Context context, @SuppressWarnings("unused") com.google.gwt.dom.client.Element parent, Folder folder, com.google.gwt.dom.client.NativeEvent event, @SuppressWarnings("unused") ValueUpdater<Folder> valueUpdater) {

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

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

                FolderContextMenu menu = new FolderContextMenu(app, MysharedTreeView.images, app.getSelectedTree(), folder);

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

                menu.show();

            }

        }

    };

    protected ListDataProvider<Folder> firstLevelDataProvider = new ListDataProvider<Folder>();

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

    protected Set<File> sharedFiles = new HashSet<File>();

    protected SingleSelectionModel<Folder> selectionModel;

    public MysharedTreeViewModel(Pithos _app, SingleSelectionModel<Folder> selectionModel) {

        app = _app;

        this.selectionModel = selectionModel;

    }

    @Override

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

        if (value == null) {

            ListDataProvider<String> rootDataProvider = new ListDataProvider<String>();

            rootDataProvider.getList().add("My Shared");

            final SingleSelectionModel<String> selectionModel2 = new SingleSelectionModel<String>();

            selectionModel2.addSelectionChangeHandler(new Handler() {

                @Override

                public void onSelectionChange(@SuppressWarnings("unused") SelectionChangeEvent event) {

                    if (selectionModel2.getSelectedObject() != null) {

                            app.deselectOthers(app.getMySharedTreeView(), selectionModel2);

                            app.applyPermissions(null);

                            fetchSharedFiles(true);

                    }

                }

            });

            app.addSelectionModel(selectionModel2);

            return new DefaultNodeInfo<String>(rootDataProvider, new TextCell(new SafeHtmlRenderer<String>() {

                @Override

                public SafeHtml render(String object) {

                    SafeHtmlBuilder builder = new SafeHtmlBuilder();

                    render(object, builder);

                    return builder.toSafeHtml();

                }

                @Override

                public void render(String object, SafeHtmlBuilder builder) {

                    String html = AbstractImagePrototype.create(MysharedTreeView.images.myShared()).getHTML();

                    builder.appendHtmlConstant(html).appendHtmlConstant(" ");

                    builder.append(MysharedTreeView.Templates.INSTANCE.nameSpan(object));

                }

            }),  selectionModel2, null);

        }

        else if (value instanceof String) {

                fetchSharedContainers(null);

            return new DefaultNodeInfo<Folder>(firstLevelDataProvider, 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, false);

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

        }

    }

        protected void fetchSharedFiles(final boolean showFiles) {

                sharedFiles.clear();

            final List<Folder> containers = app.getAccount().getContainers();

            final ListDataProvider<Folder> tempProvider = new ListDataProvider<Folder>();

            Iterator<Folder> iter = containers.iterator();

            fetchFolder(iter, tempProvider, new Command() {

                        @Override

                        public void execute() {

                                firstLevelDataProvider.getList().clear();

                                firstLevelDataProvider.getList().addAll(tempProvider.getList());

                                if (showFiles)

                                        app.showFiles(sharedFiles);

                        }

                });

        }

        private void fetchSharedContainers(final Command callback) {

            final List<Folder> containers = app.getAccount().getContainers();

            final ListDataProvider<Folder> tempProvider = new ListDataProvider<Folder>();

            Iterator<Folder> iter = containers.iterator();

            fetchFolder(iter, tempProvider, new Command() {

                        @Override

                        public void execute() {

                                firstLevelDataProvider.getList().clear();

                                firstLevelDataProvider.getList().addAll(tempProvider.getList());

                                if (callback != null)

                                        callback.execute();

                        }

                });

        }

        @Override

    public boolean isLeaf(Object o) {

                if (o == null)

                        return false;

                else if (o instanceof Folder) {

            Folder f = (Folder) o;

            return f.getSubfolders().isEmpty();

        }

                else {

                        return firstLevelDataProvider.getList().isEmpty();

                }

    }

    protected void fetchFolder(final Iterator<Folder> iter, final ListDataProvider<Folder> dataProvider, final Command callback) {

        if (iter.hasNext()) {

            final Folder f = iter.next();

            String path = "/" + f.getContainer() + "?format=json&delimiter=/&prefix=" + URL.encodeQueryString(f.getPrefix());

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

                @Override

                public void onSuccess(Folder _result) {

                        if (!_result.isShared()) {

                                for (File file : _result.getFiles()) {

                                        if (file.isShared())

                                                sharedFiles.add(file);

                                }

                                Iterator<Folder> iter2 = _result.getSubfolders().iterator();

                                fetchFolder(iter2, dataProvider, new Command() {

                                                        @Override

                                                        public void execute() {

                                            fetchFolder(iter, dataProvider, callback);

                                                        }

                                                });

                        }

                        else {

                                dataProvider.getList().add(_result);

                            fetchFolder(iter, dataProvider, callback);

                        }

                }

                @Override

                public void onError(Throwable t) {

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

                                        app.setError(t);

                    if (t instanceof RestException)

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

                    else

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

                }

                                @Override

                                protected void onUnauthorized(Response response) {

                                        app.sessionExpired();

                                }

            };

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

            Scheduler.get().scheduleDeferred(getFolder);

        }

        else if (callback != null)

            callback.execute();

    }

    public Folder getSelection() {

        return selectionModel.getSelectedObject();

    }

    public void updateFolder(Folder folder, boolean showfiles) {

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

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

        }

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

        fetchFolder(folder, dataProvider, showfiles);

    }

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

        String path = "/" + f.getContainer() + "?format=json&delimiter=/&prefix=" + URL.encodeQueryString(f.getPrefix());

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

            @Override

            public void onSuccess(final Folder _result) {

                if (showfiles)

                    app.showFiles(_result);

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

                fetchFolder(iter, dataProvider, new Command() {

                    @Override

                    public void execute() {

                        dataProvider.getList().clear();

                                   dataProvider.getList().addAll(_result.getSubfolders());

                        app.getMySharedTreeView().updateChildren(f);

                    }

                });

            }

            @Override

            public void onError(Throwable t) {

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

                                app.setError(t);

                if (t instanceof RestException)

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

                else

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

            }

                        @Override

                        protected void onUnauthorized(Response response) {

                                app.sessionExpired();

                        }

        };

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

        Scheduler.get().scheduleDeferred(getFolder);

    }

        public void initialize(Command callback) {

                fetchSharedContainers(callback);

        }

}